Battery Management Device Power Source Switching
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Solution Overview
Problem
Conventional secondary battery devices face challenges in efficiently equalizing energy across multiple cells due to uneven voltage and temperature, leading to inefficient charge/discharge processes and high power consumption, especially when monitoring and equalization circuits continue to operate without an external power source.
Innovation Solution
A power management device with a latch circuit and logic communication circuit that allows the assembled battery monitoring circuits to maintain operation and perform energy equalization even when the external power source is stopped, using stored energy and reducing power consumption through insulating communication and shutdown mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the assembled battery monitoring circuit continues to monitor voltages and perform energy equalization after the external power source is stopped, then the voltage monitoring and energy equalization functions are maintained, but the energy stored in the assembled battery is consumed unnecessarily
Solution Approach 1:
The monitoring circuit is designed to automatically detect the power source state and switch between external power source mode and assembled battery power mode without external intervention. The circuit self-manages the power supply transition and continues essential functions while adapting to available power sources.
Solution Approach 2:
The system changes its operational parameters based on the power source state. When external power is available, the circuit operates with full functionality. When external power is stopped, the circuit detects this state change and adjusts its operation to use the assembled battery as power source, modifying current consumption patterns and operational modes accordingly.
2Ease of manufacture
If the external power source is stopped during battery module replacement, then the replacement operation can be performed safely, but the monitoring and equalization circuits cannot continue to operate
Solution Approach 1:
The power source detection circuit acts as an intermediary that mediates between the external power source and the monitoring/equalization circuits. It detects the power source state and automatically switches the power supply path, allowing the circuits to continue operating from the assembled battery during module replacement when external power is disconnected.
3Reliability
If insulating communications are performed in the interface circuit, then communication isolation is achieved, but power consumption in the insulating communication circuit increases
Solution Approach 1:
The insulating communication circuit performs communications periodically rather than continuously. The communication control circuit activates the communication function only when data transmission is required, allowing the communication circuit to enter a low-power state during idle periods while maintaining the ability to communicate when needed.
Data Source
AI summary
According to one embodiment, a device includes a power management module to which a power is supplied from an external power source, a power source supply circuit to which a power is supplied from the power management module via a first input terminal, a latch circuit configured to be operated by a power supplied from the power supply circuit or a power supplied via a second input terminal, a circuit configured to output a logic signal that sets a shutdown signal output from the latch circuit to a third input terminal, and a logic communication circuit to which a logic signal is supplied via the third input terminal and which supplies the logic signal to a forth terminal of the larch circuit. The shutdown signal output from the latch circuit is set to an predetermined level when the logic signal is set to a second level from a first level.