Battery Protection Circuit Module Using Single Field-Effect Transistor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Typical battery protection circuit devices using two field-effect transistors face performance degradation due to increased operation resistance and volume reduction challenges.
Innovation Solution
A battery protection circuit module utilizing a single field-effect transistor with a protection integrated circuit (P-IC) for controlling charging and discharging, and an additional single field-effect transistor with P-IC for overcurrent protection, replacing traditional dual transistors and thermistors to reduce resistance and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two field-effect transistors are used in the battery protection circuit, then overcharge and overdischarge protection can be provided, but operation resistance increases and volume reduction becomes difficult
Solution Approach 1:
The patent merges the functions of two separate field-effect transistors into a single field-effect transistor by integrating both overcharge protection and overdischarge protection circuits within one transistor structure. This consolidation reduces the overall volume of the protection circuit module while maintaining the essential safety functions, directly addressing the contradiction between protection capability and volume reduction.
Solution Approach 2:
The single field-effect transistor is designed to perform multiple protection functions simultaneously - both overcharge protection and overdischarge protection. By making the transistor multi-functional, the circuit achieves comprehensive battery protection without requiring separate transistors for each function, thereby reducing volume while maintaining reliability.
2Reliability
If two field-effect transistors are used in the battery protection circuit, then comprehensive protection is achieved, but operation resistance increases causing performance degradation
Solution Approach 1:
By combining the protection functions into a single field-effect transistor, the patent eliminates the equivalent series resistance that would be introduced by two separate transistors. This merging reduces the total operation resistance of the circuit, preventing performance degradation while maintaining comprehensive protection capabilities.
3Reliability
If PTC thermistor is used for overcurrent protection, then protection function is provided, but device volume increases
Solution Approach 1:
The patent extracts the overcurrent protection function from the traditional PTC thermistor component and integrates it into the control logic of the single field-effect transistor protection circuit. This extraction eliminates the need for a separate PTC thermistor component, reducing device volume while maintaining overcurrent protection capability through electronic control mechanisms.
Data Source
AI summary
According to an aspect of the present invention, there is provided a battery protection circuit module including a first positive terminal and a first negative terminal electrically connected to electrode terminals of a battery bare cell, a second positive terminal and a second negative terminal electrically connected to a charger or an electronic device, a first protection circuit unit including a first single field-effect transistor connected between at least one of the first positive and negative terminals and at least one of the second positive and negative terminals, and a first protection integrated circuit (P-IC) for controlling the first single field-effect transistor, and a second protection circuit unit including a second single field-effect transistor connected between at least one of the first positive and negative terminals and at least one of the second positive and negative terminals, and a second P-IC for controlling the second single field-effect transistor.