Battery Box Adhesive Composition for Heat Stress Reliability
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Solution Overview
Problem
Battery boxes face safety issues due to adhesive cracking or peeling under heat stress from alternating temperatures, which compromises their heat conduction performance.
Innovation Solution
A battery box design where the adhesive's coefficient of thermal expansion and conductivity are matched to ensure effective heat conduction and prevent adhesive failure, using a substrate and filler composition within specific ranges to maintain adhesion and thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If adhesive is used to bond battery case and batteries, then overall energy density is improved, but adhesive cracks or peels off under heat stress from alternating temperatures
Solution Approach 1:
The patent applies parameter changes by precisely controlling the coefficient of thermal expansion (α) and coefficient of thermal conductivity (β) of the adhesive to satisfy the relation 15≤α/β≤80. This parameter optimization allows the adhesive to simultaneously achieve adequate heat conduction (improving energy density) and resist cracking or peeling under thermal stress (maintaining reliability), thus resolving the technical contradiction between energy density and adhesive integrity.
Solution Approach 2:
The adhesive used in the patent is a composite material formulation containing substrate and filler components. This composite structure enables the adhesive to possess both sufficient thermal conductivity for heat dissipation and appropriate thermal expansion characteristics to match the battery components, thereby achieving both high energy density through effective bonding and thermal management while preventing adhesive failure under alternating temperature conditions.
2Temperature
If adhesive with high thermal conductivity is used, then heat conduction performance is improved, but adhesive is more prone to cracking under heat stress
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing the specific relationship 15≤α/β≤80 between the coefficient of thermal expansion (α) and coefficient of thermal conductivity (β). This balanced parameter selection ensures the adhesive has sufficient thermal conductivity for effective heat conduction while maintaining appropriate thermal expansion characteristics that prevent excessive stress and cracking under heat stress, thus preserving adhesive strength.
3Reliability
If adhesive with high thermal expansion coefficient is used, then adhesive flexibility under temperature变化 is improved, but heat conduction requirements are not satisfied
Solution Approach 1:
The patent applies parameter changes by optimizing both the coefficient of thermal expansion (α) and coefficient of thermal conductivity (β) simultaneously to satisfy the relation 15≤α/β≤80. This coordinated parameter optimization ensures the adhesive maintains sufficient flexibility to accommodate thermal expansion and contraction (improving reliability) while also meeting the heat conduction requirements necessary for effective thermal management of the battery pack.
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 enhances the safety performance of battery boxes by maintaining adhesive integrity and meeting heat conduction requirements, preventing cracking or peeling under temperature fluctuations.
Implementation Method 1
a coefficient of thermal conductivity of the adhesive is β in units of W/mK
Implementation Method 2
a coefficient of thermal expansion of the adhesive is α in units of ppm/℃
Data Source
AI summary
This application discloses a battery box, including a battery case and a plurality of batteries accommodated in the battery case. The batteries are bonded to an inner wall of the battery case by using an adhesive, a coefficient of thermal expansion of the adhesive is α in units of ppm/° C., a coefficient of thermal conductivity of the adhesive is β in units of W/mK, and a ratio of α and β meet a relation of 15≤α/β≤80. In the battery box in this application, the battery case and the plurality of batteries accommodated in the battery case are bonded by using the adhesive. When the coefficient of thermal conductivity of the adhesive matches the coefficient of thermal expansion, heat conduction requirements of the battery box can be satisfied, and the adhesive can also be prevented from cracking or peeling off under heat stress due to alternating temperatures during use of the battery box, thereby improving safety performance of the battery box.