Method of charging a battery array

A charging method and technology of battery packs, which are applied to secondary battery charging/discharging, battery circuit devices, secondary battery repair/maintenance, etc., can solve problems such as battery degradation and inability to realize safe charging of battery packs, and achieve simple charging voltage The effect of the control

Active Publication Date: 2009-01-14
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When charging, when the voltage of a certain battery becomes higher than the maximum set voltage, t

Method used

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  • Method of charging a battery array
  • Method of charging a battery array
  • Method of charging a battery array

Examples

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Embodiment Construction

[0066] Embodiments of the present invention will be described below with reference to the drawings. The embodiments shown below are merely illustrations of the battery pack charging method for embodying the technical idea of ​​the present invention, and the battery pack charging method of the present invention is not limited to the following methods. In addition, this specification does not limit the member described in the claims to the member of an embodiment.

[0067] FIG. 1 is a block diagram of a charging circuit for charging a battery pack 1 composed of a plurality of lithium ion secondary batteries 3 . The charging circuit in this figure is equipped with: a power supply circuit 4, which charges the battery pack 1 at a constant voltage / constant current; a control circuit 5, which is used to control the charging voltage and the set current that the power supply circuit 4 charges the battery pack 1; The voltage detection circuit 6 detects the voltage of each battery 3 and...

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Abstract

The invention provides a charging method which can increase the charging capacity of a battery array while controlling the voltage of each battery at or below the maximum specified voltage. The method of charging a battery array performs constant current, constant voltage charging of a battery array while detecting the voltage of each battery. The battery array is a plurality of series connected batteries. The charging method detects the voltage of each battery cell at a prescribed sampling rate. When the voltage of any battery cell exceeds a preset maximum specified voltage, charging power is reduced for constant current, constant voltage charging of the battery array.

Description

technical field [0001] The present invention relates to a charging method for a battery pack in which a plurality of batteries are connected in series, and more particularly to a charging method most suitable for charging a battery pack in which a plurality of lithium ion secondary batteries are connected in series. Background technique [0002] When charging a battery pack in which a plurality of batteries are connected in series, each battery is charged with the same current. Therefore, when the electrical characteristics of all batteries are exactly the same, the voltages of the charged batteries become the same voltage. However, in actual battery pack charging, the voltages of the individual batteries do not become the same because the electrical characteristics of all battery cells are not exactly the same. The voltage difference between individual batteries gradually increases with use. This is due to the inconsistent degradation of individual cells. Although this s...

Claims

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Application Information

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IPC IPC(8): H02J7/04H01M10/44H02J7/02
CPCY02E60/10
Inventor 森名贤一铃木克洋上中孝郎贝野友美
Owner SANYO ELECTRIC CO LTD
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