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Charging device for rechargeable battery

A technology for rechargeable batteries and charging devices, applied in battery circuit devices, circuit devices, battery overcharge protection and other directions, can solve the problems of battery overcharge and inability to stop battery charging, etc.

Active Publication Date: 2021-12-21
FDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, a semiconductor switch is usually used for such a charging stop, and is used for opening and closing each time charging is started and stopped. However, when a failure occurs in the closed state, that is, in the short-circuit mode, there is a problem that even if you want to open the switch to stop charging, it cannot be opened. Unable to stop charging the battery, causing the battery to overcharge
In order to cope with such overcharging, conventionally, it was necessary to sequentially install protective devices on the rechargeable battery side to be charged, and cost etc. became a problem.

Method used

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  • Charging device for rechargeable battery
  • Charging device for rechargeable battery
  • Charging device for rechargeable battery

Examples

Experimental program
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Embodiment Construction

[0057] Such as figure 1 As shown, the charging device 10 of the first embodiment includes a charging circuit 1 that supplies power to the rechargeable battery 20 , a first switching element S1 that switches on and off the power supply from the charging circuit 1 to the rechargeable battery 20 , And a control device 5 for controlling the opening and closing of the first switching element S1. The charging circuit 1 has a constant voltage circuit unit 2 that maintains an output voltage Vout applied between both electrodes of the rechargeable battery 20 at a predetermined charging setting voltage Vcg during charging. In addition, as will be described later, the second switching element S2 is provided in the constant voltage circuit section 2 .

[0058] The rechargeable battery 20 is usually configured by connecting a plurality of cells in series, thereby being able to generate a predetermined voltage. In addition, the first switching element S1 and the second switching element S...

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Abstract

The invention provides a charging device for a rechargeable battery, which can reliably stop charging without providing a protection device on the rechargeable battery side even if a charging stop switch fails. A constant-voltage circuit unit (2) has a first resistor unit (R1) to a fourth resistor unit (R4), wherein the fourth resistor unit (R4) comprising two fixed resistors (R4a, R4b) and a switch (S2), and when the charge stop switch (S1) is turned off, the switch (S2) is turned on in synchronization with the turn-off of the charge stop switch (S1), thereby lowering the output voltage (Vout) of the constant-voltage circuit unit (2).

Description

technical field [0001] The present invention relates to a charging device for a rechargeable battery, and more particularly to a charging stop switch for turning off and on the power supply from the charging circuit to the rechargeable battery. Background technique [0002] Conventionally, as shown in Patent Document 1, in a charging device for charging a rechargeable battery, in order to prevent overcharging and to prevent the influence of the device from affecting the rechargeable battery when an abnormality occurs in the device, when the voltage exceeds a specified value or occurs In case of such an abnormality, a charge stop switch is provided to stop the power supply. [0003] However, a semiconductor switch is usually used for such a charging stop, and is used for opening and closing each time charging is started and stopped. However, when a failure occurs in the closed state, that is, in the short-circuit mode, there is a problem that even if you want to open the swit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/00302H02J7/0031H02J7/00712H02J7/00714H02J7/007182Y02E60/10
Inventor 关口邦久北村谦治加藤雅人
Owner FDK CORP
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