Battery Protection Circuit Module Without Overdischarge Switch

Solution Overview

Problem

Lithium-based secondary batteries are prone to instability and safety risks due to malfunctions like overcharge, overdischarge, and external damage, necessitating protection circuit modules to prevent deterioration and ensure safety, but existing designs include unnecessary components that increase size and manufacturing costs.

Innovation Solution

A semiconductor device with an integrated circuit and charge switch that senses battery voltage and interrupts charging or discharging as needed, eliminating the need for an overdischarge switch, thereby reducing component count and size while ensuring protection, and incorporating a compact design with reduced manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an overdischarge switch is included in the protection circuit module, then the battery cell is protected from overdischarge, but the device complexity and manufacturing cost increase

Engineering Contradiction:

Improvebattery cell protectionVSAvoidprotection circuit module structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the overdischarge switch from the protection circuit module, determining that it is an unnecessary component for lithium-based secondary batteries. The integrated circuit is designed to provide only overcharge protection and short circuit protection functions, removing the redundant overdischarge protection mechanism while maintaining essential safety functions.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The integrated circuit is designed to perform multiple protection functions (overcharge protection, short circuit protection) using a unified control mechanism. The charge switch serves dual purposes by controlling both overcharge prevention and short circuit protection, eliminating the need for separate overdischarge switch functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If an overdischarge switch is included in the protection circuit module, then the battery cell is protected from overdischarge, but the manufacturing cost increases

Engineering Contradiction:

Improvebattery cell protectionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent extracts and eliminates the overdischarge switch from the protection circuit module, determining that it is an unnecessary component for lithium-based secondary batteries. The integrated circuit is designed to provide only overcharge protection and short circuit protection functions, removing the redundant overdischarge protection mechanism while maintaining essential safety functions.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent discards the unnecessary overdischarge switch component from the protection circuit module design. By removing this redundant component, the manufacturing cost is reduced without compromising the essential protection functions needed for lithium-based secondary batteries.

Inventive Principle:

Principle #34Discarding and recovering

3Reliability

If an overdischarge switch is included in the protection circuit module, then the battery cell is protected from overdischarge, but the battery pack size increases

Engineering Contradiction:

Improvebattery cell protectionVSAvoidbattery pack size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent extracts and eliminates the overdischarge switch from the protection circuit module, determining that it is an unnecessary component for lithium-based secondary batteries. The integrated circuit is designed to provide only overcharge protection and short circuit protection functions, removing the redundant overdischarge protection mechanism while maintaining essential safety functions.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the protection functions into a more compact integrated circuit design that eliminates the need for separate overdischarge switch components. The charge switch and integrated circuit are configured to provide multiple protection functions in a unified, space-efficient structure, reducing the overall battery pack volume.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20110123842A1Semiconductor Device for Protecting Battery Cell, Protection Circuit Module and Battery Pack Having the Same

Publication Date: 2011.05.26 SAMSUNG SDI CO LTD

AI summary

A semiconductor device is provided. The semiconductor device includes an integrated circuit that senses a voltage of a battery cell and outputs a control signal; a charge switch that is electrically coupled to the integrated circuit and interrupts a charge path according to the control signal output from the integrated circuit; at least one first lead electrically coupled to the integrated circuit; a second lead electrically coupled to the charge switch; and a sealing portion that seals the integrated circuit, charge switch, the at least one first lead and the second lead.