Calculation method, calculation system, and calculation apparatus

• US 9,213,070 B2
• Filed: 05/29/2012
• Issued: 12/15/2015
• Est. Priority Date: 05/31/2011
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Hoshino, Masayuki, Morita, Tomokazu
• Primary Examiner(s): Le, Toan
• Application Number:
  US13/482,256
• Publication Number:
  US 20120310566A1
• Time in Patent Office: 1,295 Days
• US Class Current: 1/1
• CPC Class Codes: G01R 31/007 using microprocessors or computers
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

Abstract

A calculation method causing a calculation apparatus configured to calculate a voltage of a battery to implement a computation capability includes: referring to a detection value database configured to store a charge amount of a battery and a voltage of the battery, the voltage being generated when the battery is charged, while associating the charge amount of the battery with the voltage of the battery, and a function information database configured to store a function representing a relationship between the voltage and a charge amount of each of a plurality of active materials included in the battery; and performing a regression calculation on the voltage of the battery that is stored in the detection value database, with an amount of the active materials of the function stored in the function information database being set as a variable.

Claims

1. An estimation method for estimating deterioration degree of a battery comprising:

receiving current information and voltage information at a processor, wherein the current information and voltage information are detected, while charging the battery, by current detector and a voltage detector, respectively installed in a battery apparatus;

calculating with the processor an amount information of the battery indicating a charge amount based on the current information;

calculating a first differential value by differentiating a residual sum of squares with respect to a capacity value of an electrode value of the battery, wherein the received current information, the received voltage information, and the calculated amount information are used to obtaining the residual sum of squares;

calculating a second differential value by differentiating the residual sum of squares with respect to an internal resistance value of the battery;

repeating the calculation of the first differential value and the second differential value until both of the first differential value and the second differential value satisfy a predetermined convergence condition;

calculating a capacity of the electrode using the calculated first differential value and the calculated second differential value; and

determining a deterioration degree of the battery by referring to deterioration references stored in a memory based on the calculated capacity and internal resistance.

2. The estimation method according to claim 1, wherein the current information and the voltage information are detected at a predetermined time interval.

3. The estimation method according to claim 1, wherein the current information and the voltage information, received within predetermined time duration from the start of the estimation, are excluded from calculation of the amount information.

4. The estimation method according to claim 1, wherein receiving current information and voltage information at the processor comprises receiving the current information and voltage information from a detection value database configured to store a charge amount of a battery and a voltage of the battery.

5. An apparatus, comprising:

a processor;

a memory device coupled to the processor, the memory device containing a set of instructions that, when executed by the processor, when executed by the processor cause the processor to

receive current information and voltage information detected, while charging the battery, by current detector and a voltage detector, respectively installed in a battery apparatus;

calculate amount information of the battery indicating a charge amount based on the current information;

calculate a first differential value by differentiating a residual sum of squares with respect to a capacity value of an electrode value of the battery, wherein the received current information, the received voltage information, and the calculated amount information are used to obtaining the residual sum of squares;

calculate a second differential value by differentiating the residual sum of squares with respect to an internal resistance value of the battery;

repeat the calculation of the first differential value and the second differential value until both of the first differential value and the second differential value satisfy a predetermined convergence condition;

calculate a capacity of the electrode using the calculated first differential value and the calculated second differential value; and

determine a deterioration degree of the battery by referring to deterioration references stored in the memory based on the calculated capacity and internal resistance.

6. The apparatus of claim 5, wherein the current information and the voltage information are detected at a predetermined time interval.

7. The apparatus of claim 5, wherein the current information and the voltage information, received within predetermined time duration from the start of the estimation, are excluded from calculation of the amount information.

8. The apparatus of claim 5, wherein the set of instructions that cause the processor to receive current information and voltage information at the processor further cause the processor to receive the current information and voltage information from a detection value database configured to store a charge amount of a battery and a voltage of the battery.