Two-Terminal Battery Protection Chip Balance Control
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Solution Overview
Problem
Traditional devices for controlling the balance of battery protection chips in multi-battery systems require four terminals, increasing packaging costs and layout complexity on Printed Circuit Boards (PCBs) and complicating connections with other devices.
Innovation Solution
A device and battery protection chip design with only two ends each, where signals are managed to output strong or weak pull-up and pull-down signals based on voltage thresholds, simplifying packaging and connections by forcing signal states as needed, reducing external ends and layout complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional four-terminal battery protection chips are used, then balance control function is achieved, but packaging cost increases and layout complexity increases
Solution Approach 1:
The patent merges the balance control functionality into the existing two-terminal protection chip structure by utilizing the protection chip's internal circuitry to generate balance control signals. This integration eliminates the need for separate balance control circuits and reduces the number of external terminals from four to two, thereby simplifying packaging while maintaining the balance control function.
Solution Approach 2:
The protection chip is designed to perform multiple functions simultaneously: it provides both protection functions (overcharge, over-discharge, short-circuit protection) and balance control functions. By making the protection chip universal, the patent eliminates the need for dedicated balance control terminals, reducing packaging complexity while achieving both protection and balance control objectives.
2Reliability
If traditional four-terminal battery protection chips are used, then balance control function is achieved, but layout complexity on PCB increases
Solution Approach 1:
The balance control signals are generated and managed within the two-terminal protection chip structure, merging multiple functions into a single component. This reduces the number of PCB connection points from four terminals to two terminals, significantly simplifying the PCB layout while maintaining balance control capability across multi-battery systems.
Solution Approach 2:
The patent extracts the balance control functionality from separate external circuits and integrates it into the protection chip itself. By taking out the balance control function from external implementation and embedding it within the two-terminal chip, the PCB layout complexity is reduced as fewer external connections are required.
3Reliability
If traditional four-terminal battery protection chips are used, then balance control is implemented, but connection complexity with other devices increases
Solution Approach 1:
The protection chip integrates both protection and balance control functions into a single two-terminal device, merging multiple operational functions into one component. This reduces the number of connections required with external devices from four terminals to two terminals, making system assembly and connections simpler while maintaining full balance control implementation.
Data Source
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AI summary
A battery protection chip may comprise: a first end, configured to output a strong pull up signal when a voltage of at least one battery in a battery pack protected does not reach a balance threshold, and to output a weak pull down signal when voltages of all batteries in the battery pack protected reach the balance threshold; and a second end, configured to output a strong pull down signal when a voltage of at least one battery in a battery pack protected does not reach a balance threshold, and to output a weak pull up signal when voltages of all batteries in the battery pack protected reach the balance threshold.