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Charge rate estimation device and charge rate estimation method

A charging method and charging rate technology, which is applied to electrical devices, circuit devices, battery circuit devices, etc., and can solve problems such as difficult estimation of charging rate

Inactive Publication Date: 2015-09-23
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for secondary batteries that require a long time until the polarization is eliminated, it is difficult to accurately estimate the charging rate from the open circuit voltage because the battery has a large hysteresis at the time of charging / discharging in its SOC-OCV characteristics

Method used

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  • Charge rate estimation device and charge rate estimation method
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  • Charge rate estimation device and charge rate estimation method

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Embodiment Construction

[0019] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] A first embodiment will now be described.

[0021] figure 1 is an example of a charging / discharging device. figure 1 The charging / discharging device 1 in has a charging rate estimating device and includes, for example, a battery 2, a voltage measuring unit 3, a control unit 4, a memory 5, a charger 6, and switches SW1 and SW2. figure 1 The load 7 in is a device capable of operating by receiving power from the charging / discharging device 1 . For example, the operable device may be a motor mounted on a vehicle.

[0022] The charging rate estimating means includes, for example, a voltage measurement unit 3, a control unit 4, a memory 5, and switches SW1 and SW2.

[0023] The battery 2 is, for example, a secondary battery that has a large polarization, requires a long time for depolarization, and has a large charge / discharge hysteresis. The seconda...

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Abstract

Provided are a charge rate estimation device and charge rate estimation method for estimating with good precision the charge rate of a cell that has considerable polarization, that requires a long time to depolarize, and that has considerable charging and discharging hysteresis in SOC-OCV characteristics. The charge rate estimation device comprises: a voltage measurement unit for measuring the closed circuit voltage of a cell; a charge estimation unit for referencing charge mode information in which the charge rate and the closed circuit voltage of a cell when a charger is charging at a constant electric current using the measured closed circuit voltage are correlated, and estimating the charge rate in charge mode; and a discharge estimation unit for referencing discharge mode information in which the charge rate and the closed circuit voltage generated using a discharge pattern of the a cell obtained by actuating a vehicle using a determined actuation pattern using the measured closed circuit voltage are correlated, and estimating the charge rate in discharge mode.

Description

technical field [0001] The present invention relates to a charging rate estimating device and a charging rate estimating method for estimating the charging rate. Background technique [0002] Measuring a closed circuit voltage (CCV) and estimating an open circuit voltage (OCV) by using the measured closed circuit voltage to estimate a charge rate (state of charge (SOC)) by using the open circuit voltage is a method for estimating the charge of a battery. known method of rate. [0003] However, for a secondary battery that requires a long time until the polarization is eliminated, it is difficult to accurately estimate the charging rate from the open circuit voltage because the battery has a large hysteresis in charging / discharging in its SOC-OCV characteristics. A secondary battery using, for example, SiO (silicon monoxide) for the negative electrode is a known secondary battery that requires a long time until the polarization is eliminated. [0004] Furthermore, a remaini...

Claims

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Application Information

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IPC IPC(8): G01R31/36B60L3/00H01M10/48H02J7/00H02J7/10
CPCY02T10/705B60L11/1861H01M4/483B60L2260/44G01R31/362H02J7/00Y02T10/7044H01M10/0525B60L2240/549Y02T10/7005B60L2240/547H01M10/48H01M2220/20B60L3/12G01R31/367G01R31/3835Y02E60/10Y02T10/70G01R31/388
Inventor 西垣研治城殿征志都竹隆广野村博之
Owner TOYOTA IND CORP