Battery Board Temperature Estimation Without Cell Sensors

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Solution Overview

Problem

The temperature of energy storage devices in battery boards tends to be higher due to heat retention, affecting capacity degradation, and existing methods fail to accurately estimate the temperature of these devices within the board.

Innovation Solution

A temperature estimation device and method that acquires charge-discharge data and environmental temperature data to calculate the ambient temperature of energy storage devices, considering heat generation and transfer, allowing for accurate temperature estimation of devices within the battery board.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If multiple energy storage devices are assembled into a battery board, then the power storage capacity is improved, but the temperature of each energy storage device increases due to heat retention

Engineering Contradiction:

Improvepower storage capacityVSAvoidenergy storage device temperature

Core Design Contradiction:

Quantity of substanceVSTemperature

Solution Approach 1:

The patent introduces an ambient temperature estimation model that acts as an intermediary to calculate the temperature environment surrounding each energy storage device within the battery board. By estimating the ambient temperature based on environmental temperature and heat generation characteristics, the system can indirectly determine the actual device temperature without direct sensors on each cell, thus resolving the contradiction between maintaining high storage capacity and managing temperature rise

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If temperature sensors are installed on each energy storage device, then the temperature measurement precision is improved, but the device complexity and manufacturing cost increase

Engineering Contradiction:

Improvetemperature measurement precisionVSAvoidsensor installation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent creates a virtual copy of the temperature measurement function through mathematical modeling. Instead of physically installing sensors on each energy storage device, the system calculates ambient temperature and device temperature through estimation models that replicate the measurement function software-based, thereby achieving precise temperature monitoring without the complexity and cost of extensive hardware installation

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical/physical temperature sensing system with a computational estimation system. By substituting physical sensors with mathematical models that calculate temperature based on environmental data and heat generation characteristics, the system achieves temperature measurement precision without the device complexity associated with installing and managing numerous physical sensors

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Temperature

If the battery board structure is optimized for heat dissipation, then the temperature is reduced, but the manufacturing precision and structural complexity increase

Engineering Contradiction:

Improvebattery board temperatureVSAvoidheat dissipation structure precision

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent changes the approach from physically modifying the battery board structure to mathematically modeling the thermal parameters. By estimating ambient temperature and device temperature through computational models rather than implementing complex physical heat dissipation structures, the system reduces temperature-related risks without requiring high manufacturing precision for specialized thermal management components

Inventive Principle:

Principle #35Parameter changes

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 precise estimation of energy storage device temperatures, improving the accuracy of capacity estimation and full charge capacity assessment, thus extending the life and performance of power storage systems.

Implementation Method 1

the temperature of each energy storage device incorporated in the battery board tends to be higher than the temperature of the energy storage device alone due to the influence of heat retention in the battery board

Methodology Applied

Scientific EffectHeat generation: Joule Heating

Implementation Method 2

calculates an ambient temperature of the energy storage device in the battery board using the charge-discharge data and the temperature data

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentUS20230268571A1Temperature estimation device, computer program, and temperature estimation method

Publication Date: 2023.08.24 GS YUASA INT LTD

AI summary

A temperature estimation device includes: a charge-discharge data acquisition unit that acquires charge-discharge data relating to charge-discharge of an energy storage device; an environmental temperature data acquisition unit that acquires temperature data relating to an environmental temperature of a battery board accommodating a plurality of the energy storage devices; and a temperature estimation unit that calculates an ambient temperature of the energy storage device in the battery board using the charge-discharge data and the temperature data, and estimates a temperature of the energy storage device using the calculated ambient temperature and the charge-discharge data.