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Soc estimation apparatus

A charging state and inferring device technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as the reduction of SOC inference accuracy, and achieve the effects of improving inference accuracy, improving accuracy, and increasing compensation opportunities

Inactive Publication Date: 2020-04-03
DENSO TEN LTD
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  • Description
  • Claims
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Problems solved by technology

In the case where the difference between the open-circuit voltage at the start of discharge and the open-circuit voltage at the time of SOC estimation increases, the estimation accuracy of SOC may decrease

Method used

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Embodiment Construction

[0052]Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same symbols are assigned to the same or corresponding parts in the drawings, and the description thereof will not be repeated.

[0053] [1. Structure]

[0054] [1.1. Structure of the in-vehicle system 100 ]

[0055] figure 1 It is a functional block diagram showing the configuration of the in-vehicle system 100 using the state of charge estimating device 20 according to the embodiment of the present invention. refer to figure 1 The in-vehicle system 100 is mounted on vehicles such as a hybrid electric vehicle (HEV: Hybrid Electric Vehicle) and an electric vehicle (EV: Electric Vehicle) not shown, for example. The in-vehicle system 100 supplies electric power from the secondary battery 5 to the motor 4 and supplies regenerative electric power of the motor 4 to the secondary battery 5 . The motor 4 is the power source of the vehicle. The secondary batter...

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Abstract

An object of the present application is to provide a stage of charge (SOC) estimation device and a charge state estimation method that can improve the estimation accuracy of the SOC even if the discharge or charge of the secondary battery continues. In the SOC estimation apparatus, a measurement value acquiring unit obtains a voltage measurement value, a current measurement value, and a temperature measurement value of the second battery; an estimation value calculating unit calculates a SOC estimation value of the secondary battery based on the current measurement value; a voltage monitoringunit determines whether or not the voltage measurement value of the secondary battery has reached a predetermined voltage threshold during charge or discharge of the secondary battery; and in a case where the voltage measurement value of the secondary battery is determined to have reached the voltage threshold, a compensation unit corrects the SOC estimation value based on the current measurementvalue and the temperature measurement value that are obtained at a correction time point at which the voltage measurement value of the secondary battery has reached the voltage threshold.

Description

technical field [0001] The present invention relates to a state-of-charge estimation device for estimating the state-of-charge of a secondary battery. Background technique [0002] An electric vehicle such as a hybrid car or an electric car is equipped with a power supply for supplying electric power to a motor as a power source. A power source of an electric vehicle mainly uses a secondary battery. The secondary battery supplies power to the motor by discharging, and stores regenerative power generated by the motor by charging. [0003] An electric vehicle is equipped with a state of charge estimation device that estimates the SOC (State Of Charge) of the secondary battery so that the electric power of the secondary battery can be stably supplied to the motor. The SOC is equivalent to the charging rate of the secondary battery. The charge state estimating device acquires current measurement values ​​from sensors that measure current flowing through the secondary battery,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/3842G01R31/388
CPCG01R31/3842G01R31/388G01R31/374H02J7/0048
Inventor 渡边雄大久永将人下町孝
Owner DENSO TEN LTD
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