Hybrid Battery Dispatching for Low-Temperature Efficiency

Solution Overview

Problem

Battery energy storage systems face significant deficiencies at low temperatures due to the poor performance of lithium iron phosphate batteries and the high cost and low energy density of lithium titanate batteries, limiting their efficiency and scalability.

Innovation Solution

A high-efficiency working method that combines lithium titanate batteries for high charging/discharging efficiency at low temperatures with lithium iron phosphate batteries for high energy density, using an optimization model to optimize dispatching and incorporating heating equipment to maintain suitable temperatures for improved performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If lithium iron phosphate battery is used, then energy density and cost are improved, but charging/discharging efficiency at low temperature deteriorates

Engineering Contradiction:

Improveenergy densityVSAvoidcharging/discharging efficiency at low temperature

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent combines lithium iron phosphate batteries and lithium titanate batteries into a hybrid energy storage system. The lithium iron phosphate batteries provide high energy density and low cost, while lithium titanate batteries provide high charging/discharging efficiency at low temperatures. The two battery types work together to complement each other's strengths and weaknesses, achieving both high energy density and high low-temperature efficiency.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If lithium titanate battery is used, then charging/discharging efficiency at low temperature is improved, but cost and energy density deteriorate

Engineering Contradiction:

Improvecharging/discharging efficiency at low temperatureVSAvoidenergy density

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent combines lithium iron phosphate batteries and lithium titanate batteries into a hybrid energy storage system. The lithium iron phosphate batteries provide high energy density and low cost, while lithium titanate batteries provide high charging/discharging efficiency at low temperatures. The two battery types work together to complement each other's strengths and weaknesses, achieving both high energy density and high low-temperature efficiency.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies different battery types to different functional requirements within the system. Lithium titanate batteries are used specifically for applications requiring high low-temperature charging/discharging efficiency, while lithium iron phosphate batteries are used for applications requiring high energy density and cost-effectiveness. This localized application of different battery qualities optimizes overall system performance.

Inventive Principle:

Principle #3Local quality

3Device complexity

If single type of battery is used, then system complexity is reduced, but low-temperature performance deteriorates

Engineering Contradiction:

Improvesystem complexityVSAvoidlow-temperature performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent combines lithium iron phosphate batteries and lithium titanate batteries into a hybrid energy storage system. The lithium iron phosphate batteries provide high energy density and low cost, while lithium titanate batteries provide high charging/discharging efficiency at low temperatures. The two battery types work together to complement each other's strengths and weaknesses, achieving both high energy density and high low-temperature efficiency.

Inventive Principle:

Principle #5Merging (Combining)

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

This approach achieves high-efficiency operation of battery energy storage systems at low temperatures, reducing costs and weight while enhancing energy density and charging/discharging efficiency, significantly improving upon single-battery type systems.

Implementation Method 1

the lithium titanate battery is firstly used for charging the heating equipment to increase a temperature in an energy storage house

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS11611102B2High-efficiency working method for battery energy storage system at low temperature

Publication Date: 2023.03.21 SOUTHEAST UNIV

AI summary

The present invention discloses a high-efficiency working method for a battery energy storage system at low temperature. In the present invention, combined operation of two kinds of batteries is taken as an example to build an energy storage system framework at low temperature. A lithium iron phosphate battery and a lithium titanate battery are selected for combined operation to achieve complementary advantages of the two kinds of batteries; then, an energy storage system model for combined operation of the two kinds of batteries with the consideration of an impact of temperature on charging/discharging efficiency of the batteries is built; and finally, an optimal dispatching solution for a battery energy storage system composed of the lithium titanate battery and the lithium iron phosphate battery at low temperature is provided. By the above steps, the present invention achieves high-efficiency outputting of electricity of the battery energy storage system at low temperature, achieves complementary advantage of different kinds of batteries, and also ensures low overall cost.