Method of charging secondary battery, method of calculating remaining capacity rate of secondary battery, and battery pack

A technology of charging ratio and remaining capacity, applied in the direction of secondary battery charging/discharging, battery circuit device, secondary battery, etc., can solve the problems of increasing integration error, preventing accurate calculation of battery capacity, and reducing the accuracy of capacity calculation, etc. Achieving the effect of high-accuracy detection

Active Publication Date: 2005-11-02
MURATA MFG CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

If the current of the battery shows a small value, the voltage method provides high accuracy in capacity calculation, whereas if the above current shows a large value, it will change due to the fluctuation of the DC Imp (impedance) with the ambient temperature. Or the fluctuation of Imp inside the battery, etc., without obtainin...

Method used

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  • Method of charging secondary battery, method of calculating remaining capacity rate of secondary battery, and battery pack
  • Method of charging secondary battery, method of calculating remaining capacity rate of secondary battery, and battery pack
  • Method of charging secondary battery, method of calculating remaining capacity rate of secondary battery, and battery pack

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Embodiment Construction

[0045] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0046] FIG. 3 is a schematic diagram illustrating an example of the structure of a battery pack to which an embodiment of the present invention is applied.

[0047] At the time of charging, the battery pack shown in the figure is installed in a charging device, wherein a positive terminal 1 and a negative terminal 2 are respectively connected to the positive terminal and the negative terminal of the charging device to start charging. Also, when the battery pack is operated with an electronic device, the positive terminal 1 and the negative terminal 2 of the battery pack are connected to the positive terminal and the negative terminal of the electronic device to start discharging, just like the connection at the time of charging.

[0048] The battery pack includes a battery unit 7, a microcomputer 10, a measurement circuit 11, a protection circuit 12, a switch circui...

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Abstract

PROBLEM TO BE SOLVED: To correctly detect full charge by further accurately measuring a charging capacity, in a charging method for a secondary battery obtained by combining an integration method and a voltage method that have conventionally been used.SOLUTION: The charging capacity (charging rate) is calculated by the integration method (current integration or power integration) from the start of charging to the vicinity of the full charge. The charging capacity is gradually shifted to a value calculated by the voltage method by adding thereto values obtained by both the calculation methods in accordance with a proportion multiplied by a voltage-method reliability coefficient by using a coefficient being a voltage-method reliability when the charging capacity reaches the vicinity of the full charging, and the integration method calculated value can be switched to the voltage method calculated value without an uncomfortable feeling, thus performing the correct full charge detection (charging rate calculation).

Description

technical field [0001] The invention relates to a storage battery charging method, a calculation method for the remaining capacity ratio of the storage battery and a battery pack. Background technique [0002] Currently, for many devices using batteries, a rechargeable storage battery is used at a user's home or the like and charged with a charging device. These devices are configured to indicate that charging is in progress or completed through the color of the light, flashing or liquid crystal display, or are configured to give an indication of the battery capacity to let the user know the approximate remaining usable time. [0003] The method of detecting the charging capacity and remaining capacity of the storage battery may include the integral method and the voltage method. In the integral method, the charging capacity is calculated by obtaining the integral of the current or power output, while in the voltage method, whether the battery voltage has been measured is ca...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44H01M10/48H02J7/10
CPCY02E60/10
Inventor 穗刈正树佐佐木太一
Owner MURATA MFG CO LTD
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