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Battery pack

A battery pack and storage battery technology, applied in battery overcharge protection, battery circuit device, battery overcurrent protection, etc., can solve the problem of rapid battery deterioration and achieve the effect of preventing deterioration

Active Publication Date: 2008-09-17
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, if a battery pack with accumulators, especially lithium-ion accumulators, is placed in a state of high battery voltage for a long period of time, the rate of deterioration of the batteries may be rapid

Method used

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Embodiment Construction

[0017] Referring to the drawings, various embodiments of the present invention will be described below. FIG. 1 shows a battery pack according to an embodiment of the present invention. The battery pack mainly includes: a storage battery 1 , a microcomputer 10 as a processor, a current measurement unit 11 , a voltage measurement unit 12 , a temperature measurement unit 13 , a protection circuit 9 and a regulator 16 . When the battery pack is charged, the pack is mounted to the main body of the electronic device, AC adapter, or the like. A positive terminal 2 connected to the positive electrode side of the secondary battery 1 and a negative terminal 3 connected to the negative electrode side of the secondary battery 1 are respectively connected to positive and negative terminals of a charging device to perform charging. Also, when the electronic device is used, similar to the case of charging, the positive terminal 2 and the negative terminal 3 are respectively connected to the...

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Abstract

A battery pack includes a secondary cell, a selection unit, a judging unit, an elapsed time period comparing unit, and a control unit. The selection unit selects either a first operation state or a second operation state. The control unit controls the selection unit to switch from the first operation state to the second operation state when the elapsed time period is longer than a predetermined time period. The control unit also controls the selection unit to switch from a second operation state to a first operation state either (a) when judged as being in an used state by the judging unit while the second operation is selected (b) when a voltage of the second cell becomes equal to or less than a second voltage threshold value which is smaller than a first voltage threshold value while the second operation state is selected.

Description

technical field [0001] The invention relates to batteries comprising, for example, lithium-ion accumulators. Background technique [0002] Secondary batteries such as lithium ion secondary batteries are compact in size and light in weight, and have high energy density, high output, and the like. Therefore, secondary batteries are widely used as power sources for application devices such as digital cameras, mobile phones, portable PCs, and camcorders (short for camera and recorder). Lithium-ion secondary batteries are used by repeated discharging and charging, but if the battery is left in a fully charged state or near a fully charged state, battery performance tends to decrease and battery life tends to be shortened. In particular, storage conditions such as being at a high temperature and for a long time lead to significant deterioration of the battery. [0003] For example, if charge and discharge are repeated in the following manner: First, charge the lithium-ion batter...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44
CPCH02J7/0075H02J7/0029H02J2007/0037H02J2007/004H02J7/0069H02J7/00306H02J7/00302H02J7/00304
Inventor 早川雅彦
Owner MURATA MFG CO LTD
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