PARAMETER ESTIMATION DEVICE FOR BATTERY

• US 20170315179A1
• Filed: 10/26/2015
• Published: 11/02/2017
• Est. Priority Date: 10/31/2014
• Status: Abandoned Application

• Current Assignee: Calsonic Kansei Corporation, KEIO University
• Original Assignee: Calsonic Kansei Corporation, KEIO University
• Inventors: BABA, Atsushi, ADACHI, Shuichi
• Application Number:
  US15/520,522
• Publication Number:
  US 20170315179A1
• Time in Patent Office: Days
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A parameter estimation device for a battery capable of reducing an error in estimate of an internal resistance caused by a temperature difference is provided. In a parameter estimation device for a battery (1) for sequentially estimating parameters including a resistance in an equivalent circuit model (41) of the battery based on a temperature of the battery and at least one of a voltage of the battery and a current of the battery, as a resistance value of the resistance in the equivalent circuit model of the battery, a resistance value at a predetermined temperature is estimated, and a resistance value at a present temperature is calculated based on the resistance value at the predetermined temperature and the present temperature.

Claims

1. A parameter estimation device for a battery for sequentially estimating parameters including a resistance in an equivalent circuit model of the battery based on a temperature of the battery and at least one of a voltage of the battery and a current of the battery,

wherein as a resistance value of the resistance in the equivalent circuit model of the battery, a resistance value at a predetermined temperature is estimated, and a resistance value at a present temperature is calculated based on the resistance value at the predetermined temperature and the present temperature.

2. The parameter estimation device for a battery according to claim 1,

wherein the resistance value at the present temperature is calculated using the following expression that includes the resistance value at the predetermined temperature and a temperature-dependent coefficient:

3. The parameter estimation device for a battery according to claim 2,

wherein the temperature-dependent coefficient a_R is a constant obtained beforehand.

4. The parameter estimation device for a battery according to claim 2,

wherein the temperature-dependent coefficient a_R is determined based on a table obtained beforehand and indicating a relationship between the temperature-dependent coefficient a_R and the temperature T.

5. The parameter estimation device for a battery according to claim 2,

wherein the temperature-dependent coefficient a_R and the resistance value R^T0 at the predetermined temperature T₀ are obtained by simultaneous estimation.