Y-Connected Battery Strings for AC Output and Battery Recovery

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Solution Overview

Problem

Existing electric power supply systems using battery strings primarily output direct current and lack the capability to output alternating current, limiting their applications and increasing costs.

Innovation Solution

An electric power supply system that includes an alternating current sweep unit and an alternating electric current power supply circuit, utilizing Y-connected U-phase, V-phase, and W-phase battery strings with inverters to convert direct current into alternating current, along with a control device to manage power adjustments and battery charging, allowing for efficient output of alternating current.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a battery string is used to output direct current electric power, then the system is simple and reliable, but the range of applications is limited and alternating current cannot be output

Engineering Contradiction:

Improverange of applicationsVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The battery string system is designed to perform multiple functions: it can output both direct current electric power (through the DC battery string) and alternating current electric power (through the AC battery strings with inverters). This multi-functionality allows the same battery string infrastructure to serve diverse application needs, expanding adaptability while maintaining system reliability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system is divided into separate functional modules: a DC battery string for direct current output and AC battery strings with integrated inverters for alternating current output. This segmentation allows each module to be optimized for its specific function while maintaining overall system simplicity and reliability

Inventive Principle:

Principle #1Segmentation

2Power

If high-output density batteries are used in the direct current battery string, then power output is improved, but battery deterioration may accelerate

Engineering Contradiction:

Improvepower outputVSAvoidbattery durability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The control device implements periodic action by alternating between high-power output mode (using high-output density batteries) and charging mode. After a predetermined period of power output, the system switches to charging mode where the AC battery strings charge the DC battery string, allowing the high-output density batteries to rest and recover, thereby preventing accelerated deterioration while maintaining high power output capability when needed

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system discards the continuous high-power discharge state by periodically switching to a charging state. The high-output density batteries are allowed to recover through charging from the AC battery strings after their power output period, enabling them to be reused sustainably without permanent degradation

Inventive Principle:

Principle #34Discarding and recovering

3Power

If alternating current is continuously output from the alternating current power supply circuit, then high power output is achieved, but battery deterioration accelerates

Engineering Contradiction:

Improvepower outputVSAvoidbattery service life

Core Design Contradiction:

PowerVSDuration of action of stationary object

Solution Approach 1:

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system maintains continuity of useful action by ensuring that while the DC battery string is discharging to provide high power, the AC battery strings are simultaneously charging the DC battery string in preparation for the next discharge cycle. This continuous cycle of discharge and charge ensures sustained power availability without permanent battery degradation

Inventive Principle:

Principle #20Continuity of useful action

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

Enables the expansion of battery string applications by outputting alternating current, reducing costs through the use of high-output density batteries and energy-type batteries, while stabilizing current and preventing battery deterioration by controlling charging and output periods.

Implementation Method 1

an alternating electric current power supply circuit configured to convert an output of a direct current sweep unit including a direct current battery string into alternating electric current using an inverter

Methodology Applied

Scientific EffectInversion (electrical):

Data Source

PatentEP4138249B1Electric power supply system

Publication Date: 2023.11.01 TOYOTA JIDOSHA KK

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AI summary

An electric power supply system (1) includes an alternating electric current power supply circuit (2) that converts direct current electric power of a first direct current sweep unit (10) including a battery string (Stl) into alternating electric current using a first inverter (51) and outputs it, and an alternating current sweep unit (3) that includes a U-phase battery string (St4), a V-phase battery string (St6), and a W-phase battery string (St8) that are Y-connected. Output densities of batteries (B) of the battery string (Stl) are higher than output densities of batteries (B) of the alternating current sweep unit (3). Alternating electric current is output from the alternating current sweep unit (3) and the alternating electric current power supply circuit (2), and after a predetermined period elapses, the alternating electric current output from the alternating electric current power supply circuit (2) is stopped.