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Battery, battery protection processing device and control method

A protection treatment and battery pack technology, applied in battery circuit devices, emergency protection circuit devices, circuit devices, etc., can solve the problems of increasing design costs, expanding installation space, etc., and achieve precise protection processing, reliable protection, and reduced production costs Effect

Inactive Publication Date: 2005-10-05
SONY GRP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when only voltage comparators are used to detect battery cell voltages as described above, it is necessary to provide a protection circuit including as many voltage comparators as battery cells connected in series, thereby causing problems of increased design cost and enlarged installation space.

Method used

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  • Battery, battery protection processing device and control method
  • Battery, battery protection processing device and control method
  • Battery, battery protection processing device and control method

Examples

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Embodiment Construction

[0057] Embodiments of the present invention will be further described in detail with reference to the accompanying drawings.

[0058] Figure 4 An example of the internal structure of the battery pack according to the embodiment of the present invention is shown.

[0059] The battery pack according to the present invention is an integrated assembly of a secondary battery and a circuit that performs a processing function to display a remaining capacity of the secondary battery and a protection function against an abnormal state of the secondary battery. The embodiment uses a lithium ion secondary battery having such discharge characteristics that the discharge voltage decreases relatively gradually and linearly. For example, use of such a secondary battery makes it possible to accurately detect the remaining battery capacity and display it according to the available remaining time.

[0060] Figure 4The battery pack in has: a battery cell 1 including a lithium ion secondary ...

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Abstract

It is aimed at stably implementing a protection function of a secondary battery mainly under software control and providing a battery pack characterized by a reduced circuit installation area, parts costs, and power consumption. An AD converter outputs a voltage value between a positive electrode and a negative electrode of a secondary battery. Based on the voltage value, a microcontroller determines a state of the secondary battery out of overcharge, normal operation, and over-discharge states. According to the determined state, the microcontroller controls operations of a discharge current cutoff means and a charge current cutoff means via a FET driver. When it is determined that the secondary battery is placed in an overcurrent state based on the charge and discharge current size of the secondary battery, an overcurrent detection circuit enables the discharge current cutoff means to be a cutoff state in preference to control by the microcontroller.

Description

[0001] This application claims priority from Japanese Patent Application No. 2003-385372 filed on November 14, 2003, the entire contents of which are hereby incorporated by reference. technical field [0002] The present invention relates to a battery pack of a secondary battery integrated with a processing circuit for performing processing including preventing occurrence of failure in the secondary battery, a battery protection processing device for performing the processing, and a battery protection processing The control method of the device. Background technique [0003] In recent years, the number of portable electronic devices such as digital cameras on the market has increased. The performance of secondary batteries mounted on these electronic devices is very important. Such secondary batteries include lithium ion batteries. [0004] In particular, if the lithium-ion secondary battery is overcharged, lithium ions are precipitated as metallic lithium on the negative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/04G01R31/36G06F1/32H01M10/42H01M10/44H01M10/48H02H7/18H02J7/00H02M3/07
CPCH01M10/4264H01M10/448H02J7/0031H01M10/482H01M10/443H01M10/48H02J7/0036G01R31/3655H01M10/486Y02E60/10H02J7/04
Inventor 佐藤秀幸土谷之雄中道龙二长岛修小出敏弘
Owner SONY GRP CORP
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