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Electrical storage system, and full charge capacity estimation method for electrical storage device

A technology of full charge capacity and power storage device, which is applied to battery circuit devices, battery/fuel cell control devices, circuit devices, etc., can solve problems such as inability to accurately calculate SOC, and achieve accurate calculations and improved calculation accuracy.

Inactive Publication Date: 2015-11-11
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, in a region where the change in SOC is greater than that in OCV, the SOC may not be accurately calculated due to changes caused by detection errors of the voltage sensor, etc.

Method used

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  • Electrical storage system, and full charge capacity estimation method for electrical storage device
  • Electrical storage system, and full charge capacity estimation method for electrical storage device
  • Electrical storage system, and full charge capacity estimation method for electrical storage device

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Embodiment Construction

[0026] Embodiments of the present invention will be described below.

[0027] figure 1 is a diagram showing the configuration of the battery system according to the embodiment. figure 1 The battery system shown can be mounted on a vehicle, for example. The vehicle may be, for example, a plug-in hybrid vehicle (plug-inhybrid vehicle, PHV) or an electric vehicle (electric vehicle, EV).

[0028] A PHV includes a battery pack (to be described later) and another power source, such as an engine and a fuel cell, as a power source for propelling the vehicle. In a PHV, the battery pack can be charged with electricity from an external power source. Also, in a PHV including an engine, the battery pack can be charged by converting kinetic energy generated by the engine into electrical energy.

[0029] The EV includes only a battery pack as a power source of the vehicle, and is capable of charging the battery with electric power supplied from an external power source. The external pow...

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Abstract

An electrical storage, system mounted on a vehicle includes: an electrical storage device that is charged or discharged; and a controller that calculates an SOC on the basis of a correspondence relationship between a voltage of the electrical storage device and an SOC of the electrical storage device and that calculates a full charge capacity of the electrical storage device on the basis of an SOC difference between before and after charging and an accumulated charging current value during charging.

Description

technical field [0001] The present invention relates to a technique for estimating the full charge capacity of a secondary battery or the like. Background technique [0002] The state of charge (state of charge, SOC) indicates the ratio of the current charge to the full charge capacity. The full charge capacity is, for example, calculated on the basis of the SOC difference calculated from the terminal voltage (OCV) of the battery before charging and the terminal voltage of the battery after charging (for example, Japanese Patent Application 2012-29455 (JP2012-29455A)). [0003] The SOC and OCV are in correspondence, so if the correspondence is obtained in advance, it is possible to calculate the current SOC of the battery based on the voltage value detected by the voltage sensor. [0004] However, the correspondence relationship between SOC and OCV has a region in which a change in OCV is smaller than a change in SOC. In this region, even if the SOC changes, the OCV does ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L11/18G01R31/36H02J7/00H02J7/04
CPCB60L11/1861B60L11/1816B60L11/1838B60L11/1862B60L2240/545B60L2240/547B60L2240/549G01R31/361G01R31/3651H01M10/44H01M10/48H01M2220/20H02J7/0073H02J7/0081H02J7/041H02J2007/0049Y02T10/7005Y02T10/7044Y02T10/705Y02T10/7072Y02T90/14B60L53/14B60L58/13G01R31/3828G01R31/367H02J7/0049H02J7/007184H02J7/0071Y02T10/70Y02E60/10H02J7/04G01R31/3842H02J7/0047Y02T90/12Y02T90/16G01R31/3648H01M2010/4271H02J7/0068
Inventor 有留浩治
Owner TOYOTA JIDOSHA KK