Battery Module Hold Circuit for Microcontroller Reset Resilience
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Solution Overview
Problem
Conventional battery modules in motor vehicles disconnect from the electrical system during brief management system malfunctions, such as microcontroller resets, causing temporary loss of power to safety-relevant components.
Innovation Solution
A hold circuit is introduced to maintain control signals to the switching unit for a time delay, ensuring the battery remains connected during microcontroller resets, and separate control of charging and discharging currents is achieved using MOSFETs with body diodes connected in anti-series.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the management system directly controls the switching element without a hold circuit, then the control structure is simple and responsive, but the battery unit disconnects during brief management system malfunctions causing loss of power to safety components
Solution Approach 1:
A hold circuit is introduced as an intermediary component between the management system and switching unit. This hold circuit maintains the control signal state during brief management system malfunctions, preventing unintended disconnection of the battery unit and ensuring continuous power supply to safety-relevant components.
Solution Approach 2:
The hold circuit is designed to anticipate and compensate for brief management system malfunctions by maintaining the control signal state during such events. This preliminary action ensures that the switching element remains in its intended state even when the management system temporarily fails, preventing power loss to safety components.
2Ease of operation
If charging and discharging control are combined in a single switching element, then the device structure is simpler, but independent control of charging and discharging currents cannot be achieved
Solution Approach 1:
The switching unit is segmented into separate switching elements for charging and discharging control. This segmentation allows independent control of charging and discharging currents, enabling the system to prevent charging during microcontroller resets while allowing discharging for intrinsic safety.
Solution Approach 2:
Different switching elements within the switching unit are assigned different functions - one for charging control and another for discharging control. This local differentiation enables tailored control strategies for each current direction, with the charging switch being controllable and the discharging switch being permanently closed for safety.
Data Source
AI summary
A battery module (5) for a motor vehicle. The battery module (5) includes a battery unit (2), a negative pole (21), a positive pole (22), a switching unit (60), which is connected electrically in series with the battery unit (2) and has at least one controllable switching element, and a management system (30) for controlling the at least one switching element. A hold circuit (40) is provided, which is connected to the management system (30) and to the switching unit (60) in such a way that a control signal from the management system (30) can be transferred through the hold circuit (40) to the switching unit (60), and is designed such that, in an active state of the hold circuit (40), a control signal from the management system (30) to open the at least one switching element can be transferred to the switching unit (60) with a time delay.