Built-in Charge Circuit with Dual Reverse-Current Prevention

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Solution Overview

Problem

Conventional charge circuits in secondary batteries are susceptible to damage due to undesirable currents generated by reversed charge connections, which can lead to heat generation and component damage.

Innovation Solution

Incorporating a first and second reverse-current prevention part within the charge circuit to inhibit the flow of reverse current, preventing damage to the charge circuit components by ensuring proper current flow paths and protection mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional charge circuit is built in the secondary battery to enable charging when detached from the portable electronic device, then the battery can be charged in a detached state, but the charge circuit becomes susceptible to damage due to reverse current from wrong connection

Engineering Contradiction:

Improvecharging capability in detached stateVSAvoidcharge circuit durability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary anti-action by incorporating reverse current prevention elements (diodes) in advance within the charge circuit. These elements are pre-positioned to block reverse current flow before it can cause damage, thus preventing the harmful effect while maintaining the charging capability in detached state.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent uses diodes as intermediary elements that mediate between the charge circuit and potential reverse current. The diodes act as one-way valves for current flow, allowing normal charging current to pass while blocking reverse current, thus protecting the charge circuit components without interfering with normal operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If reverse current prevention elements are added to protect against wrong connection, then the charge circuit is protected from damage, but the device complexity increases

Engineering Contradiction:

Improvecharge circuit protectionVSAvoidcharge circuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the reverse current prevention function with the existing charge circuit structure by integrating diodes into the minimal necessary paths. Rather than adding complex protection systems, the diodes are combined with the existing charge terminals and circuit elements, achieving protection with minimal additional components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses simple, inexpensive diodes as the protection elements. These are basic electronic components that are cheap and reliable, providing effective reverse current blocking without requiring complex or expensive protection mechanisms. The simplicity of the diode structure keeps the overall device complexity low.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively prevents damage to the charge circuit components by blocking reverse currents, ensuring the safety and integrity of the battery during both normal and reversed charge connections.

Implementation Method 1

a first reverse-current prevention part, and a second reverse-current prevention part for preventing damage of the first reverse-current prevention part

Methodology Applied

Scientific EffectElectrical Resistance: Electrical Resistance

Implementation Method 2

a charge circuit section for supplying a charging current to the protection circuit section

Methodology Applied

Scientific EffectElectrochemical energy storage: Battery (electricity)

Data Source

PatentUS8945735B2Built-in charge circuit for secondary battery and secondary battery with the built-in charge circuit

Publication Date: 2015.02.03 SAMSUNG SDI CO LTD

AI summary

A secondary battery which includes a built-in charge circuit. The secondary battery includes a bare cell having a positive electrode and a negative electrode; a protection circuit section electrically connected to the bare cell; a positive electrode charge/discharge terminal and a negative electrode charge/discharge terminal electrically connected to the protection circuit section; a charge circuit section for supplying a charging current to the protection circuit section; and a positive electrode charge terminal and a negative electrode charge terminal electrically connected to the charge circuit section, wherein the charge circuit section includes a first reverse-current prevention part, and a second reverse-current prevention part for preventing damage of the first reverse-current prevention part due to the reversed charge.