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Secondary battery system and method of estimating deterioration state of secondary battery system

A secondary battery and circuit technology, applied in the direction of battery/battery traction, secondary battery, secondary battery repair/maintenance, etc., can solve the problem of the decrease of estimation accuracy, the decrease of reaction resistance estimation accuracy, and the inability to estimate the degradation mode with high accuracy and other issues to achieve the effect of improving the estimation accuracy

Active Publication Date: 2019-08-06
TOYOTA JIDOSHA KK
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Problems solved by technology

[0006] The inventors of the present invention have focused on the fact that, when the predetermined conditions (described later) hold when calculating the reaction resistance as described above, the reaction resistance cannot be accurately divided from other impedance components according to the period of the current value, and the reaction resistance The estimation accuracy of
When the estimation accuracy of the reaction resistance decreases, the deterioration mode corresponding to the reaction resistance cannot be estimated with high accuracy
That is, the estimation accuracy of the deterioration state of the secondary battery may decrease

Method used

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  • Secondary battery system and method of estimating deterioration state of secondary battery system

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Embodiment Construction

[0032] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. It should be noted that, for the same or corresponding parts in the drawings, the same reference numerals are attached and the description thereof will not be repeated.

[0033] It should be noted that, below, a configuration in which the secondary battery system 2 of the present embodiment is mounted on the vehicle 1 will be described as an example. However, the use of the "secondary battery system" of the present disclosure is not limited to vehicle use, and may be for stationary use, for example.

[0034] figure 1 It is a diagram schematically showing the overall configuration of a vehicle 1 equipped with a secondary battery system 2 according to the present embodiment. refer to figure 1 , the vehicle 1 of the present embodiment is a plug-in hybrid vehicle. However, vehicles that can be mounted on the "secondary battery system 2" of the present disclosur...

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Abstract

The invention provides a secondary battery system and a method of estimating the deterioration state of a secondary battery system. The secondary battery system includes a secondary battery, an electric circuit, and an electronic control unit. The electronic control unit is configured to execute first calculation control, second calculation control, and estimation control when a predetermined condition is satisfied. The first calculation control is control for calculating a first impedance of the secondary battery based on a voltage value of the secondary battery at a time when a current valueof the secondary battery is fluctuated on a first cycle. The second calculation control is control for calculating a second impedance of the secondary battery based on the voltage value of the secondary battery at a time when the current value of the secondary battery is fluctuated on a second cycle. The estimation control is control for estimating a reaction resistance of the secondary battery from a difference between the first impedance and the second impedance.

Description

technical field [0001] The present disclosure relates to a secondary battery system and a method for estimating a deterioration state of the secondary battery system, and more specifically, relates to a technique for estimating a reaction resistance of a secondary battery. Background technique [0002] In recent years, the spread of vehicles equipped with secondary batteries for running has been advancing. The secondary batteries mounted on these vehicles deteriorate with use or the passage of time, and therefore it is required to estimate the deterioration state of the secondary batteries. Therefore, a method of estimating the deterioration state of the secondary battery based on the impedance (internal resistance) of the secondary battery has been proposed. [0003] For example, the storage battery evaluation device disclosed in JP 2011-185619 includes a current detection unit for detecting a current flowing into the storage battery, a pulsation rate calculation unit, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/48G01R31/389
CPCH01M10/4207H01M10/425H01M10/482H01M10/486H01M2220/20H01M2010/4271H01M10/48B60L50/51B60L58/10B60L2210/40H01M10/465Y02T10/72Y02T10/70Y02T90/14Y02T10/7072Y02E60/10H01M10/4257G01R31/392H01M2010/4278G01R31/389
Inventor 田代广规
Owner TOYOTA JIDOSHA KK
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