Charge/Discharge Control Circuit for Parallel Battery Stability
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Solution Overview
Problem
Existing battery devices with charge/discharge control circuits lose control when an abnormality occurs in one of the secondary batteries connected in parallel, leading to instability.
Innovation Solution
A charge/discharge control circuit with a connection circuit that connects power supply terminals and outputs an electric potential, allowing the controller to operate on a potential difference and control charging/discharging currents despite abnormalities in parallel-connected secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If secondary batteries are connected in parallel to increase capacity, then the battery device can provide higher current output, but the system becomes unstable when an abnormality occurs in one of the batteries
Solution Approach 1:
The power supply system is segmented into multiple independent battery modules (first secondary battery and second secondary battery), each with its own power supply terminal. The controller can selectively operate on power from one battery or the other through the connection circuit, allowing independent management of each battery unit. This segmentation enables the system to maintain stability by isolating abnormalities to individual modules while preserving overall system functionality.
2Extent of automation
If a controller directly monitors parallel-connected batteries, then charge/discharge control can be implemented, but the controller loses control capability when an abnormality occurs in one battery
Solution Approach 1:
A connection circuit is introduced as an intermediary between the batteries and the controller. This connection circuit includes switching elements that can selectively connect the controller to either the first or second power supply terminal. When an abnormality is detected in one battery, the connection circuit redirects the controller's power supply connection to the healthy battery, maintaining control capability without direct monitoring of the abnormal battery. This intermediary mechanism preserves automated control while isolating the controller from abnormalities.
3Reliability
If series connection is used for battery configuration, then control is maintained during abnormalities, but the current output capability is limited
Solution Approach 1:
The battery configuration transitions from a fixed series or parallel connection to a dynamic reconfigurable system. The connection circuit enables real-time switching between different battery connections based on operational conditions and battery status. During normal operation, batteries can be connected in parallel to provide high current output. When abnormalities occur, the connection dynamically reconfigures to maintain control while preserving power output capability from healthy batteries. This dynamic adaptability resolves the contradiction between control reliability and power capability.
Data Source
AI summary
In order to provide a charge/discharge control circuit capable of controlling a charge/discharge current of secondary batteries that are connected in parallel, the charge/discharge control circuit includes: a first power supply terminal and a second power supply terminal to which a respective first electrode of each of secondary batteries which are connected in parallel is connected; a third power supply terminal to which second electrodes of the secondary batteries are connected; a connection circuit configured to connect the first power supply terminal and the second power supply terminal to generate an electric potential for an output; and a controller configured to operate on a potential difference between the electric potential supplied from the connection circuit and an electric potential supplied from the third power supply terminal, and to control charging/discharging of the first secondary battery and the second secondary battery.