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Battery pack, electronic device and method for detecting remaining quantity in battery

By designing the charging current summation and counting measurement part in the battery pack to calculate the attenuation rate, the error problem caused by the number of charges and discharges and temperature changes when detecting the battery remaining capacity of the lithium-ion battery is solved, and a more accurate battery remaining capacity is achieved. detection.

Inactive Publication Date: 2008-12-10
SONY GROUP CORP
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Problems solved by technology

In this case, it cannot be said that the number of charges and discharges is accurately counted, which poses a problem that the decay rate cannot be accurately detected

Method used

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Embodiment Construction

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Also, in the following embodiments, a digital camera is taken as an example and described as operating with a storage battery as a power source.

[0025] FIG. 1 shows a diagram depicting the configuration of essential parts of a digital camera and a battery pack according to an embodiment of the present invention.

[0026] The battery pack 1 shown in FIG. 1 accommodates a battery unit 11 formed of a storage battery and a battery protection circuit 12 mainly for protecting the battery unit 11 from an abnormal state in a package as a whole. In addition, the digital camera 2 is a device that images an image by a solid-state imaging device (not shown), records the image on a recording medium (not shown) as digital data, and operates with power supplied from the battery pack 1 .

[0027] In the battery pack 1, the positive terminal 11a and the negative terminal 11b ...

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Abstract

A battery pack is provided with a charging / discharging count measuring section (131) for measuring the charging / discharging count of a secondary battery, based on an integration value of a charging current to the secondary battery; and a deterioration rate outputting section (132) for calculating a deterioration rate indicating the degree of deterioration of the secondary battery, based on the charging / discharging count measured by the charging / discharging count measuring section (131), and outputs the results to a discharge load device. The charging / discharging count measuring section (131) repeatedly integrates the detection value of the charging current up to a prescribed threshold value, for instance, and counts up the charging / discharging count each time the integration value reachesthe threshold value. Thus, even when charging and discharging are repeated many times within a relatively small voltage range, the number of charging / discharging can be accurately counted, and calculation accuracy of the deterioration rate is improved. In the battery pack containing the secondary battery, parameters for detecting the remaining quantity in the battery are accurately detected.

Description

technical field [0001] The present invention relates to a battery pack in which a secondary battery and a processing circuit are accommodated in one piece, an electronic instrument receiving power from the secondary battery inside the battery pack to operate, and a method of detecting the remaining battery level in such an electronic instrument, The processing circuit executes predetermined processing based on various detection values ​​from the storage battery. Background technique [0002] In recent years, portable electronic instruments such as digital video cameras are rapidly increasing, and the performance of storage batteries mounted on these electronic instruments is considered to be very important. As one of these secondary batteries, there is a so-called lithium ion type battery. [0003] In addition, among the above-mentioned portable electronic devices using a storage battery as a power source, many devices have a function of indicating the remaining battery lev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/48H02J7/00G01R31/36
CPCG01R31/3648G01R19/16542H01M10/052H01M10/44H01M10/48G01R31/392H02J7/0048Y02E60/10G01R31/3828H02J7/005H01M50/204
Owner SONY GROUP CORP
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