Battery Device Overcurrent Recovery Switch Circuit
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Solution Overview
Problem
Battery devices with two charge/discharge control devices face issues where removing a load causing discharge overcurrent does not always result in a successful return to a normal state due to overcharge detection turning off the charge control transistor, failing to change the voltage of the overcurrent detection terminal in the second charge/discharge control device.
Innovation Solution
Incorporating a switch circuit between the overcurrent detection terminal of the second charge/discharge control circuit and the external terminal, ensuring the voltage of the external negative terminal and overcurrent detection terminal are equal when the second charge/discharge control device detects discharge overcurrent, allowing the voltage to drop below the discharge overcurrent threshold upon load removal, thus enabling the battery to return to a normal state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two charge/discharge control devices are used to enhance safety, then safety is improved, but the system becomes unable to return to normal state after discharge overcurrent detection due to interaction between overcharge and overcurrent detection mechanisms
Solution Approach 1:
A switch circuit is introduced as an intermediary component between the first charge/discharge control device and the second charge/discharge control device. This switch circuit selectively connects or disconnects the overcurrent detection terminal of the second control device based on the operational state, enabling the system to return to normal after overcurrent protection without compromising safety
Solution Approach 2:
The switch circuit dynamically changes its connection state based on the detection results of the first charge/discharge control device. When overcharge is detected, the switch connects the overcurrent detection terminal to enable proper voltage change and return to normal state, resolving the static limitation of the dual-control-device configuration
Data Source
AI summary
Provided is a battery device high in safety and ease of use, which has no difficulty in returning to a normal state after discharge overcurrent is detected. The battery device includes a first charge/discharge control device including a first charge/discharge control transistor, and a first charge/discharge control circuit configured to detect the voltage of a secondary battery to control charging and discharging; a second charge/discharge control device including a second charge/discharge control transistor connected to an external terminal via the first charge/discharge control transistor, and a second charge/discharge control circuit configured to detect the voltage of the secondary battery to control charging and discharging; and a switch circuit arranged between an overcurrent detection terminal of the second charge/discharge control circuit and the external terminal. The switch circuit is turned on with a discharge stopping signal of the second charge/discharge control circuit.