Battery Protection Circuit Isolation for Safe Repair Mode
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Solution Overview
Problem
Lithium batteries in various applications experience maintenance issues due to residual electricity in the battery pack, leading to potential short-circuits when powered on during maintenance, despite being seemingly powered down.
Innovation Solution
A battery device with a microcontroller and power-supply switch that disconnects and reconnects the electrical connection between the battery cell and protection circuit based on specific signal combinations, including a start signal, repair signal, and external-power-indication signal, to manage power states during maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery pack remains connected to the motherboard during maintenance, then communication functionality is maintained, but short-circuit risks increase due to residual electricity
Solution Approach 1:
The battery pack is divided into electrically isolated segments through the power supply switch. During maintenance, the switch disconnects the battery cell from the protection circuit and motherboard, creating separate electrical zones. This segmentation allows communication to occur through isolated interfaces while preventing harmful electrical interaction between the battery and motherboard circuits.
Solution Approach 2:
The power supply switch acts as an intermediary component between the battery cell and the protection circuit/motherboard. It mediates the electrical connection by providing controlled disconnection, allowing the system to maintain communication capabilities through the protection circuit while preventing direct electrical contact that could cause short-circuits during maintenance operations.
2Object-affected harmful factors
If the battery pack is completely disconnected during maintenance, then short-circuit risks are eliminated, but communication and power supply capabilities are lost
Solution Approach 1:
The electrical connection is segmented into controllable sections. The power supply switch enables selective disconnection of the battery cell while maintaining connection pathways for communication interfaces. This allows the protection circuit to remain electrically connected to the motherboard for communication purposes while the battery cell is isolated, achieving both safety and operational continuity.
Solution Approach 2:
The power supply switch provides dynamic control over electrical connections. During normal operation, the switch maintains closed contacts for full functionality. During maintenance, the switch dynamically transitions to an open state for the battery cell while preserving communication pathways, allowing the system to adapt its electrical configuration based on operational requirements.
3Use of energy by moving object
If the power supply switch remains closed during maintenance, then power supply is continuous, but maintenance safety is compromised
Solution Approach 1:
The power supply switch is designed to enable preliminary disconnection of the battery cell before maintenance activities begin. By opening the switch contacts in advance, the system eliminates residual electricity flow to the motherboard while maintaining power supply to essential components through alternative pathways, ensuring safety is established before maintenance operations commence.
Solution Approach 2:
The switch provides localized electrical isolation specifically at the battery cell connection point while preserving power supply and communication capabilities in other parts of the system. This local quality control allows maintenance safety to be achieved at the battery interface without compromising overall system power supply or communication functionality.
Data Source
AI summary
A battery device includes a battery cell and a battery protection circuit. The battery protection circuit includes a microcontroller and a power-supply switch. The microcontroller receives a start signal, a repair signal, and an external-power-indication signal from the outside of the battery device. The power-supply switch is electrically connected to the battery cell. The microcontroller correspondingly outputs an enable signal to the power-supply switch according to the start signal and the repair signal, so that the power-supply switch disconnects the electrical connection between the battery cell and the battery protection circuit. The microcontroller correspondingly outputs a disable signal to the power-supply switch according to the start signal, the repair signal, and the external-power-indication signal, so that the power-supply switch restores the electrical connection between the battery cell and the battery protection circuit.