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Charge/discharge control circuit and battery device

A charging and discharging control and control circuit technology, applied to battery circuit devices, circuit devices, battery disconnection circuits, etc., can solve problems such as battery voltage imbalance, secondary battery burden, and inability to control secondary battery charge and discharge, and achieve The effect of preventing shortened life and preventing imbalance

Inactive Publication Date: 2014-12-24
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In a battery device including a plurality of secondary batteries connected in series, if the connection between the secondary battery and the charge-discharge control circuit is disconnected (hereinafter referred to as disconnection of the intermediate terminal), the charge-discharge control of the secondary battery cannot be performed.
That is, there is a problem in that the secondary battery cannot be detected regardless of whether it is overcharged or overdischarged, which imposes a huge burden on the secondary battery.
[0010] However, in the conventional charge and discharge control circuit and battery device, the current consumed by the secondary battery 107a and the current consumed by the secondary battery 107b have a difference corresponding to the current flowing through the intermediate terminal disconnection detection circuit 211.
This difference in current becomes an unbalanced current for the connected secondary battery, causing the battery voltage to become unbalanced, so there is a problem that the life of the battery device is shortened.

Method used

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  • Charge/discharge control circuit and battery device
  • Charge/discharge control circuit and battery device
  • Charge/discharge control circuit and battery device

Examples

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no. 1 approach ＞

[0032] figure 1 It is a circuit diagram of the battery device including the charge and discharge control circuit according to the first embodiment. The battery device including the charge and discharge control circuit of the first embodiment includes secondary batteries 107 a and 107 b , charge control FET 106 , discharge control FET 105 , external terminals 112 and 113 , and charge and discharge control circuit 101 . The charging and discharging control circuit 101 has: a positive power supply connection terminal 108, an intermediate terminal 109, a negative power supply connection terminal 110, an intermediate terminal disconnection detection circuit 125, an intermediate terminal disconnection detection circuit 118, a voltage detection circuit 102, a voltage detection circuit 103, and The control circuit 104 has an intermediate terminal opening control circuit 115 . The intermediate terminal disconnection detection circuit 125 is composed of a constant current source 111 a...

no. 2 approach ＞

[0044] figure 2 It is a circuit diagram of a battery device including a charge and discharge control circuit according to the second embodiment. The intermediate terminal disconnection detection circuit 123 of the second embodiment includes a constant current source 124 and switches 119 , 120 , 121 , and 122 .

[0045] One terminal of the switch 119 is connected to the positive terminal 108 of the power supply, and the other terminal is connected to one terminal of the constant current source 124 . The other terminal of the constant current source 124 is connected to one terminal of the switch 122 . The other terminal of the switch 122 is connected to the negative terminal 110 of the power supply. One connection terminal of the switch 121 is connected to the connection point between the switch 119 and the constant current source 124 , and the other terminal is connected to the intermediate terminal 109 . One connection terminal of the switch 120 is connected to a connectio...

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Abstract

The present invention provides a charge / discharge control circuit and a battery device capable of detecting an intermediate terminal disconnection without causing the balance between battery voltages to collapse and shortening the service life of the battery device. A charge / discharge control circuit which controls charging / discharging of a plurality of secondary batteries connected in series is equipped with intermediate terminal disconnection detecting circuits each of which is provided between a positive electrode terminal and a negative electrode terminal of each secondary battery and detects an intermediate terminal disconnection of each intermediate terminal by intermittently equal detection currents.

Description

technical field [0001] The present invention relates to a charge and discharge control circuit and a battery device including a plurality of secondary batteries connected in series and an intermediate terminal disconnection detection circuit that detects disconnection of the secondary battery. Background technique [0002] In a battery device including a plurality of secondary batteries connected in series, if the connection between the secondary battery and the charge-discharge control circuit is disconnected (hereinafter referred to as disconnection of the intermediate terminal), the charge-discharge control of the secondary battery cannot be performed. . That is, there is a problem that it is impossible to detect whether the secondary battery is overcharged or overdischarged, and a huge burden is placed on the secondary battery. Therefore, for the purpose of improving the safety of the secondary battery by detecting the disconnection of the intermediate terminal, a batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0031H02J7/0036G01R31/3835H01M10/48
Inventor 斋藤启
Owner SII SEMICONDUCTOR CORP
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