Secondary Battery Protection Circuit Voltage Distribution
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Solution Overview
Problem
Existing battery packs face inefficiencies in power consumption due to the need to convert a single voltage into two voltages for loads, leading to power loss and decreased consumption efficiency.
Innovation Solution
A secondary-battery protection circuit that includes switching circuits and protection ICs to manage voltage supply across series-connected batteries, allowing for efficient voltage distribution to loads without unnecessary conversion, thereby preventing unintended current flows and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single voltage is converted into two voltages for loads, then the battery pack can power multiple loads with different voltage requirements, but power loss increases and consumption efficiency decreases
Solution Approach 1:
The battery pack is segmented into two independent voltage output systems: one providing voltage across the first secondary battery (first output terminal to second output terminal) and another providing voltage across both series-connected batteries (second output terminal to third output terminal). This segmentation eliminates the need for voltage conversion and directly supplies appropriate voltages to different loads, reducing power loss while maintaining versatility.
2Adaptability or versatility
If voltage conversion is performed to supply different voltages to loads, then multiple load requirements are met, but device complexity increases
Solution Approach 1:
The series-connected battery configuration serves multiple functions simultaneously: it provides a first voltage across the first battery for one load, provides a second voltage across the second battery for another load, and provides a third voltage (sum of first and second) across both batteries for a third load. This multi-functionality eliminates the need for separate voltage conversion circuits, reducing device complexity while maintaining adaptability.
3Reliability
If protection circuits are added to prevent overdischarge and overcurrent, then battery safety is improved, but power consumption increases
Solution Approach 1:
The protection ICs are configured to autonomously monitor battery parameters and control switching circuits without requiring external intervention or additional power-consuming control systems. When abnormal conditions such as overdischarge or overcurrent are detected, the protection ICs automatically turn off the switching circuits to interrupt current flow, providing self-service protection that minimizes additional power consumption.
Data Source
AI summary
A secondary-battery protection circuit is configured to, in response to detecting that a first switching circuit is turned on and a second switching circuit is turned on, supply a first output voltage to a first load between a first terminal and a second terminal; and supply a third output voltage to a second load between the first terminal and a third terminal, the third output voltage indicating the sum of the first output voltage and a second output voltage, the second output voltage corresponding to a voltage across a second secondary battery. In response to detecting that the first switching circuit is turned off and the second switching circuit is turned on, the secondary-battery protection circuit is configured to stop supplying the first output voltage to the first load; and stop supplying the third output voltage via the first terminal and the third terminal.