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Method and apparatus for estimating state of charge of secondary battery

一种二次电池、充电状态的技术，应用在二次电池充电/放电、二次电池、二次电池维修/保养等方向，能够解决不是十分实用等问题

Active Publication Date: 2005-04-06
PANASONIC EV ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the technique is not very practical

Method used

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  • Method and apparatus for estimating state of charge of secondary battery
  • Method and apparatus for estimating state of charge of secondary battery

Examples

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Embodiment Construction

[0031] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0032] figure 1 is a block diagram illustrating an exemplary structure of a battery pack system including an apparatus for estimating a state of charge of a secondary battery according to an embodiment of the present invention and a high-voltage circuit portion as part of an HEV. exist figure 1 Among them, the battery pack system includes a secondary battery 100, which is composed of a single battery or a combination of multiple unit batteries, and a battery electric control unit (hereinafter abbreviated as battery ECU) 101, which, as a part of a microcomputer system, includes a Invented state of charge estimation device.

[0033] The high voltage circuit section includes: a power switch section 10 , an inverter circuit 11 and a motor / generator (hereinafter abbreviated as M / G) 12 . The power switch section 10 is switched on / off according to a control ...

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PUM

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Abstract

When a power switch portion 10 is in an open state and a charge / discharge path of the secondary battery 100 is in a disconnected state, an electromotive force calculation portion 109 calculates a battery electromotive force Veq by subtracting a polarized voltage Vpol stored in a polarized voltage storage portion 113 from an open-circuit voltage OCV measured by a voltage measurement portion 102. Based on the electromotive force, a state-of-charge estimation portion 110 estimates a state of charge SOC. Thus, a polarized voltage to be considered for the estimation of SOC can be limited. The state of charge (SOC) of a secondary battery can be estimated with high accuracy and quickly.

Description

technical field [0001] The present invention relates to a method of estimating the state of charge (SOC) of a secondary battery, such as a nickel metal hydride (Ni-MH) battery, etc., wherein the secondary battery is installed in a pure electric vehicle (PEV), a hybrid electric vehicle (HEV), etc., as a power source for motors and a drive source for various loads. Background technique [0002] Traditionally, in HEVs, when the output of its engine is higher than the power required for driving, the remaining power drives the generator to charge the secondary battery. Conversely, when the output of the engine is lower than the required power, the electric power of the secondary battery will drive the motor to output power so as to make up for the shortage of required power. In this case, the secondary battery is discharged. Therefore, when a secondary battery is mounted on an HEV or the like, it is necessary to control charging and discharging of the secondary battery to maint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36B60L3/00B60L11/18B60R16/02B60R16/033B60R16/04G01N27/416H01M10/44H01M10/48
CPCG01R31/3624G01R31/362G01R31/3675G01R31/374G01R31/3835G01R31/3842Y02E60/10H01M10/44
Inventor 村上雄才山边律人南浦启一木村忠雄
Owner PANASONIC EV ENERGY CO LTD
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