Battery capacity calculating method

A technology of battery capacity and measurement method, applied in secondary batteries, measurement of electrical variables, circuits, etc., can solve problems such as residual capacity deviation

Inactive Publication Date: 2004-10-27
MURATA MFG CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In other words, the discharge curve varies with discharge conditions, and thus, with the existing voltage method of simply measuring the discharge voltage based on the discharge curve used as a reference to obtain the remaining capacity, there is a concern that the estimated remaining capacity is different from the actual remaining capacity serious deviation

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Embodiment Construction

[0048] Referring to the accompanying drawings, the battery capacity measuring method according to the present invention will be described in detail.

[0049] The battery capacity measurement method of the present invention is generally composed as follows: at the beginning, a discharge curve used as a reference (hereinafter referred to as a reference discharge curve) is obtained, and then the measured voltage of the battery as the measurement object is corrected by using the resistance element of the battery. V1 obtains the corrected voltage V, and uses the thus obtained corrected voltage V to calculate the discharge capacity of the battery from the reference discharge curve to obtain the corrected voltage V. The voltage V is corrected so that the discharge curve of the battery as the measurement object approximates the reference discharge curve.

[0050] In the case of battery degradation as the measurement object, in addition to correction with the correction voltage V, furt...

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Abstract

The present invention is relative to a battery capacity calculating method including a reference discharge curve calculating step of finding a discharge curve, operating as a reference, a corrected voltage calculating step of correcting a measured voltage V1 of the battery with a component of an electrical resistance to find a corrected voltage V, and a capacity calculating step of finding the discharging capacity of the battery from the discharge curve, operating as a reference, using the corrected voltage V. The capacity calculating step includes a sub-step of calculating a capacity deterioration index S, as a ratio of capacity decrease caused by battery deterioration. The discharging capacity, calculated from the discharging capacity, operating as a reference, using the corrected voltage V, is further multiplied with the capacity deterioration index S to calculate the discharging capacity.

Description

technical field [0001] The invention relates to a battery capacity calculation method for calculating the discharge capacity or remaining capacity of a battery. [0002] This application claims priority from Japanese Patent Application No. 2002-139167 filed in Japan on May 14, 2002, which is hereby incorporated by reference in its entirety. Background technique [0003] As a method for calculating the capacity of a battery such as a lithium ion storage battery, a method of calculating a remaining capacity by a current integration method of estimating capacity from a Coulomb value and a method of calculating a remaining capacity based on a voltage between battery terminals have been used so far. [0004] In the process of calculating battery capacity, even for the same type of battery, the difference in coulomb value or terminal voltage is caused by the difference in measurement conditions or degradation state, so that the current capacity or remaining capacity of the battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/48
CPCG01R31/3675G01R31/3679G01R31/362G01R31/3648G01R31/392G01R31/374G01R31/3835Y02E60/10H01M10/48
Inventor 山崎和夫畠沢刚信富田尚池田多闻名和隆一石川雄一堀正典
Owner MURATA MFG CO LTD
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