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EP0637754A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Battery capacity meter

Assignee: Seiko Epson Corp
•
Filing: 1994-01-25
•
Granted: —
•
Expires: 2014-01-25
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Abstract

Abstract This meter comprises means for measuring the discharge current and terminal voltage of a battery; a data table showing the values of available capacity which are expressed by combinations of the values of different discharge currents, and the values of the terminal voltages, and prepared on the basis of the values measured in advance; storage means for storing the data table; and means for displaying on a display the value of the available capacity by reading the capacity from the storage means in accordance with the terminal current and voltage values when the battery is in use. The value of the available capacity is defined as the ratio of the total time during which the discharge with a constant current is possible at from the initial voltage in the fully charged condition to the final voltage, and the remaining time during which the discharge of constant current is possible at from the value of the measured terminal voltage to the final voltage.

Inventors

  • 👤 Minoru Kouzaki
  • 👤 Toshihiko Yamazaki
  • 👤 William A. Marritt

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 16:13
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/36; G01R31/3644; G01R31/3648; G01R31/382; G01R31/3842; G01R31/005; G01R31/006

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 157 words
A battery remaining capacity meter which comprises: a detecting means for detecting the discharge current and the terminal voltage of a battery, a data table of remaining capacity values, which correspond to the combinations of current values at several different discharge currents and in which the remaining capacity values are based on actual values measured in advance, a memory for storing the above data table, and an indicating means for reading the remaining capacity value from the memory using the current value and the terminal voltage value of the operating battery and for giving instructions to a display, wherein the remaining capacity value is set as a ratio between a total time during which a constant current discharge can be made from an initial voltage in a fully charged state to an end voltage and a remaining time during which the constant current discharge can be made from the detected terminal voltage value to the end voltage.
Claim 2
Dependent Claim 52 words
A battery remaining capacity meter according to Claim 1, wherein the table stored in said memory has each current value corresponding to usable conditions in one span of the table and a voltage value division divided into several small ranges corresponding to each current value in the other span of the table.
Claim 3
Dependent Claim 52 words
A battery remaining capacity meter according to Claim 2. wherein the remaining capacity values corresponding to current values in said table has the maximum capacity value of each row defined as 100%, and other values in the same row defined as a ratio of percentage with respect to the maximum capacity value.
Claim 4
Dependent Claim 44 words
A battery remaining capacity meter according to Claim 3. wherein said display means is provided with a prescribed number of light emission elements and increases or decreases in the number of active light emission elements corresponding to the magnitude of said remaining capacity value.
Claim 5
Dependent Claim 61 words
A battery remaining capacity meter according to Claim 4, wherein said remaining capacity value of from 0 to 100% is divided into a plurality of groups, the number of said groups agrees with the number of said light emission elements, and increases or decreases in the number of active light emission elements corresponding to the magnitude of said remaining capacity value.
Claim 6
Dependent Claim 49 words
A battery remaining capacity meter according to Claim 1, wherein the remaining capacity value is determined from the terminal current and voltage value immediately before the in-flow of an electric current to the battery for a period during which the electric current flows into the battery by power regeneration.

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