Dual Battery Protection Circuits for Early Micro-Short Detection
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Solution Overview
Problem
Existing secondary battery systems lack effective early detection and warning mechanisms for abnormalities such as micro-short circuits, overcharge, and overdischarge, which can compromise safety.
Innovation Solution
A dual protection circuit system is implemented, comprising a first protection circuit with a comparison circuit for abnormality detection during charging and a second protection circuit with an arithmetic circuit for detecting abnormalities in both charging and discharging, using a Coulomb counter to calculate charging capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single protection circuit is used for secondary battery monitoring, then device complexity is reduced, but abnormality detection precision and reliability are insufficient
Solution Approach 1:
The protection circuit is divided into two independent circuits: a first protection circuit with a comparison circuit that detects abnormalities during charging, and a second protection circuit with an arithmetic circuit that detects abnormalities during both charging and discharging. Each circuit performs specialized detection functions, improving overall reliability without requiring a single complex circuit to handle all scenarios
Solution Approach 2:
The second protection circuit performs both charging and discharging abnormality detection, while the first protection circuit focuses specifically on charging abnormalities. This partial specialization allows each circuit to be optimized for its specific function, improving detection precision without requiring both circuits to perform all detection tasks
2Object-affected harmful factors
If early abnormality detection is implemented, then safety is improved, but device complexity increases due to additional detection circuits
Solution Approach 1:
The comparison circuit in the first protection circuit continuously monitors charging voltage and detects micro-short circuits and other abnormalities during charging before they escalate into serious safety hazards. The arithmetic circuit in the second protection circuit similarly performs preliminary detection during discharging, enabling early warning and preventive action
Solution Approach 2:
The dual protection circuit system acts as an intermediary monitoring layer between the battery and the control system. The circuits detect abnormalities and generate warning signals that can trigger preventive actions, such as stopping charging or discharging operations before safety hazards develop
Data Source
AI summary
The safety is ensured in such a manner that an abnormality of a secondary battery is detected, for example, a phenomenon that lowers the safety of the secondary battery is detected early and a warning is given to a user. A first protection circuit and a second protection circuit are provided for one secondary battery. The first protection circuit includes a memory circuit including a transistor including an oxide semiconductor. Combination of a plurality of protection circuits enables a complementary double protection system in charging, and the safety can be further enhanced.