Battery Cell Assembly With Matched Hardness for Uniform Pressure
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Solution Overview
Problem
Conventional battery assemblies experience uneven pressure distribution between battery cells and heat dissipation parts, leading to local stress concentration, potential damage to battery cells, and inefficient gas discharge.
Innovation Solution
The battery assembly incorporates a pad part with a surface hardness similar to that of the heat dissipation part, ensuring uniform pressure distribution across battery cells and preventing local stress concentration. The pad part is deformable to accommodate battery cell expansion and contraction, and the heat dissipation part is made of a thermally conductive adhesive material to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal adhesive and elastomeric pad are made of materials with different surface hardness, then heat dissipation function is achieved, but pressure distribution becomes uneven and local stress concentration occurs
Solution Approach 1:
The patent controls the surface hardness parameter of the heat dissipation part to be within 50 Shore A units of the pad part's surface hardness. This parameter control ensures that the heat dissipation part does not create excessive local stress while still providing effective thermal conduction, thus resolving the contradiction between heat dissipation performance and pressure distribution uniformity.
2Temperature
If rigid material is used for heat dissipation part, then thermal conductivity is improved, but stress concentration and potential damage to battery cells occurs
Solution Approach 1:
The patent specifies that the heat dissipation part should have surface hardness within 50 Shore A units of the pad part, preventing the use of overly rigid materials. This parameter control allows the heat dissipation part to maintain adequate thermal conductivity while being soft enough to distribute stress uniformly and avoid damaging battery cells during compression or thermal expansion.
3Stability of the object's composition
If uniform pressure is applied to battery cells, then cell stability is improved, but gas discharge may be hindered
Solution Approach 1:
The patent controls the surface hardness of the heat dissipation part to be within 50 Shore A units of the pad part, creating a compliant interface that provides uniform pressure distribution for cell stability while still allowing localized deformation pathways for gas to escape through the sealing structure without causing damage.
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 configuration maintains uniform pressure within battery cells, reduces the risk of damage, and facilitates smooth gas discharge, thereby improving the lifespan and stability of the battery assembly.
Implementation Method 1
the heat dissipation part may be made of a thermally conductive material
Implementation Method 2
the pad part is deformable according to expansion and contraction of a battery cell adjacent to the pad part
Implementation Method 3
the heat dissipation part may be made of an adhesive material
Data Source
AI summary
The present disclosure relates to a battery assembly including a case accommodating a plurality of battery cells, a heat dissipation part located between the plurality of battery cells and the accommodating bottom surface, and a pad part located between a plurality of battery groups in which adjacent battery cells among the plurality of battery cells are grouped by a preset number of cells, wherein an absolute value of a difference between a surface hardness of the heat dissipation part and a surface hardness of the pad part is less than or equal to a preset allowable value.