Power Storage Module Layout for Temperature-Driven Durability Balance

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Solution Overview

Problem

Conventional power storage modules face challenges in equalizing high-rate durability among power storage devices due to temperature distribution, leading to decreased fuel efficiency and increased weight when mounted on vehicles, as existing solutions require bulky restriction members and fixed pressure distribution.

Innovation Solution

A power storage module design where power storage devices with different negative electrode active material layer peak intensity ratios are strategically placed based on temperature zones, with lower peak intensity ratio devices in low-temperature regions and higher peak intensity ratio devices in high-temperature regions, allowing for flexible durability adjustment and reduced restriction members.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If restriction members are used to apply pressure to power storage devices in low-temperature regions, then high-rate durability is improved, but device complexity and weight increase

Engineering Contradiction:

Improvehigh-rate durabilityVSAvoidrestriction member structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies different restriction pressures to different regions of the power storage module. Specifically, the third restriction member applies a different restriction pressure to power storage devices in the third region compared to other regions, compensating for temperature-induced durability variations without requiring complex individual restriction members for each device

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The restriction members serve multiple functions: they provide mechanical support, apply uniform pressure across multiple power storage devices, and compensate for temperature distribution effects. This multi-functionality reduces the need for additional specialized components

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If restriction members are added to each cell group to equalize durability, then high-rate durability is improved, but volume energy density decreases

Engineering Contradiction:

Improvehigh-rate durabilityVSAvoidvolume energy density

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent merges the restriction functions into a unified structure where the third restriction member manages pressure for multiple power storage devices simultaneously. This consolidation reduces the total volume occupied by restriction components compared to having individual restriction members for each cell group

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The restriction pressure is locally adjusted in the third region where power storage devices are positioned, applying pressure only where needed to compensate for temperature effects rather than uniformly across all cell groups, thereby preserving volume energy density

Inventive Principle:

Principle #3Local quality

3Reliability

If restriction pressure is increased in low-temperature regions, then high-rate durability is equalized, but weight increases leading to deteriorated fuel efficiency

Engineering Contradiction:

Improvehigh-rate durability equalityVSAvoidpower storage module weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent applies restriction pressure locally only to the third region where power storage devices are positioned, rather than increasing pressure uniformly across the entire module. This targeted approach achieves durability equalization while minimizing additional weight

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The restriction pressure parameter is adjusted specifically for the third region to compensate for temperature distribution effects, changing the pressure level only where necessary to achieve durability equalization without increasing overall module weight

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

This approach enhances high-rate durability equality and improves fuel efficiency by optimizing device placement within the module, reducing weight and maintaining high energy density.

Implementation Method 1

the negative electrode active material layer includes graphite... when the negative electrode active material layer is measured by an X-ray crystal structure analysis and a ratio (I004/I110) of a peak intensity I004 derived from a (004)-plane of the graphite to a peak intensity I110 derived from a (110)-plane of the graphite

Methodology Applied

Scientific EffectIntercalation: Absorption (physical)

Data Source

PatentUS20240332690A1Power storage module and manufacturing method for the same

Publication Date: 2024.10.03 PRIME PLANET ENERGY & SOLUTIONS INC

AI summary

A power storage module disclosed herein includes a plurality of power storage devices. A low-temperature region with relatively low temperature and a high-temperature region with relatively high temperature exist in the power storage module when the plurality of power storage devices are charged and discharged, and in a first power storage device disposed in the low-temperature region among the plurality of power storage devices, a peak intensity ratio (I004/I110) of a negative electrode active material layer is lower than that in a second power storage device disposed in the high-temperature region.