US 11,307,261 B2Granted

Rechargeable battery state estimation device

AssigneeMitsubishi Electric Corporation

InventorsTomoki Takegami, Toshihiro Wada, Seigo Kadota

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Abstract

In response to demands for stably and precisely estimating states, a rechargeable battery state estimation device includes a current detecting unit which detects a charge-discharge current of the rechargeable battery as a detected current; a voltage detecting unit which detects a voltage between terminals of the rechargeable battery as a detected voltage; an OCV estimation method SOC estimation unit which calculates an OCV estimation method state of charge, based on the detected current and the detected voltage; a current integration method parameter estimation unit which estimates a current integration method parameter including a capacity retention rate, based on the detected current and the OCV estimation method state of charge; and a corrected SOC estimation unit which calculates an estimated state of charge, based on the detected current, the OCV estimation method state of charge, and the current integration method parameter.

Claims17

Dependent claims

A rechargeable battery state estimation device which estimates a state of charge of a rechargeable battery as an estimated state of charge, the rechargeable battery state estimation device comprising:

a current detector which detects a charge-discharge current of the rechargeable battery as a detected current,
a voltage detector which detects a voltage between terminals of the rechargeable battery as a detected voltage,
a low pass filter which outputs a value which is eliminated of high frequency components, and
a processor configured to:
calculate an open circuit voltage (OCV) estimation state of charge of the rechargeable battery, based on the detected current of the rechargeable battery and the detected voltage between the terminals of the rechargeable battery,
estimate a current integration parameter including a capacity retention rate, based on the detected current of the rechargeable battery and the OCV estimation state of charge of the rechargeable battery, and
calculate an estimated state of charge of the rechargeable battery by:
calculating a current integration state of charge of the rechargeable battery, based on the detected current of the rechargeable battery and the current integration parameter of the rechargeable battery,
wherein the estimated state of charge of the rechargeable battery is based, at least in part, on (a) the current integration state of charge of the rechargeable battery and (b) the value output from the low pass filter that receives an input comprising a difference value between the OCV estimation state of charge of the rechargeable battery and one of the current integration state of charge of the rechargeable battery or the estimated state of charge of the rechargeable battery.

6 more elements

a current detector which detects a charge-discharge current of the rechargeable battery as a detected current,
a voltage detector which detects a voltage between terminals of the rechargeable battery as a detected voltage, and
a processor configured to:
calculate an open circuit voltage (OCV) estimation state of charge of the rechargeable battery, based on the detected current of the rechargeable battery and the detected voltage between the terminals of the rechargeable battery,
estimate a current integration parameter including a capacity retention rate, based on the detected current of the rechargeable battery and the OCV estimation state of charge of the rechargeable battery,
calculate an estimated state of charge of the rechargeable battery by:
calculating a current integration state of charge of the rechargeable battery, based on the detected current of the rechargeable battery and the current integration parameter of the rechargeable battery,
calculate a change in the state of charge of the rechargeable battery, based on the detected current and the current integration parameter,
correct an estimation error of the current integration parameter, and an estimation error for the current integration state of charge,
generate a first coefficient vector, based on the detected current,
obtain a second coefficient vector, based on the first coefficient vector,
obtain a reference signal, based on the OCV estimation state of charge, and
estimate the current integration parameter, based on the second coefficient vector and the reference signal.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/491,194Filed 6 Nov 2017
Priority: JP JP2017-06994031 Mar 2017
Published: US 2020/0033416 A130 Jan 2020
Granted: 19 Apr 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G01R 31/3828
Arrangements for monitoring battery or accumulator variables, e.g. SoC: using current integration
G01R 31/36
Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by…
G01R 31/367
Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of…
G01R 31/3842
Arrangements for monitoring battery or accumulator variables, e.g. SoC: combining voltage and current measurements

Family

US 2020/0033416 A1Pre-grant publication · published 30 Jan 2020
US 11,307,261 B2This patent

From the US filing history. Foreign family members aren’t listed.

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