Pouch Cell CTP Battery Pack Adhesive Structure for Impact Stability
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Solution Overview
Problem
Pouch cells face challenges in integration into CTP type battery packs due to difficulty in withstanding external impacts and poor assembly properties, leading to poor overall stability and assembly difficulties.
Innovation Solution
A battery pack design that includes a casing with adhesive materials, such as thermally conductive structural adhesive and foaming adhesive, to securely hold a stack of pouch battery cells, along with side plates and a glue blocking structure to enhance stability and insulation, and a foaming adhesive to improve rigidity and thermal protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pouch battery cells are directly integrated into CTP type battery pack, then energy density is improved, but assembly difficulty increases and overall stability deteriorates
Solution Approach 1:
The patent introduces adhesive materials as intermediary substances between the pouch battery cells and the battery pack casing. These adhesives serve as mediators that facilitate the assembly process while ensuring stable integration, thereby resolving the contradiction between direct integration benefits and assembly difficulties.
Solution Approach 2:
The patent employs different types of adhesive materials with varying properties (thermally conductive structural adhesive, foaming adhesive) to change the physical and chemical parameters of the bonding interface. This allows optimization of both assembly ease and structural stability without compromising energy density.
2Quantity of substance
If pouch battery cells are directly integrated into CTP type battery pack, then energy density is improved, but protection against external impacts deteriorates
Solution Approach 1:
The patent applies adhesive materials in advance during the assembly process to provide protective cushioning between the pouch battery cells and external environment. This beforehand protection measures prevents direct impact on the battery cells while maintaining the direct integration structure for high energy density.
Solution Approach 2:
The patent uses composite adhesive structures combining different material properties (structural adhesive for strength, thermally conductive adhesive for heat dissipation, foaming adhesive for cushioning) to provide comprehensive protection against external impacts while maintaining energy density.
3Stability of the object's composition
If adhesive materials are used to connect battery cell stack to casing, then overall stability is improved, but assembly complexity increases
Solution Approach 1:
The adhesive materials perform multiple functions simultaneously: mechanical bonding, thermal conduction, impact cushioning, and structural reinforcement. This multi-functionality reduces the need for separate components, thereby improving stability without significantly increasing assembly complexity.
Solution Approach 2:
The patent merges multiple protective and bonding functions into a single adhesive material application step. By combining structural support, thermal management, and impact protection into one material system, the assembly process remains simple while achieving high overall stability.
4Temperature
If thermally conductive structural adhesive is used, then thermal management is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent selects thermally conductive structural adhesive with optimized material parameters that provide sufficient thermal conduction while maintaining ease of application. The adhesive's flow properties and curing characteristics are designed to tolerate normal manufacturing variations without compromising thermal management performance.
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 design provides a stable and easily assembled battery pack with enhanced protection against external impacts, improved thermal management, and increased safety through effective insulation and thermal runaway prevention.
Implementation Method 1
the first adhesive layer is a thermally conductive structural adhesive
Implementation Method 2
the second adhesive layer is a foaming adhesive
Data Source
AI summary
The disclosure relates to the field of batteries, and specifically provides a battery pack and an electric vehicle. The battery pack has a casing including a lower case base plate and a beam structure, a cell stack formed by stacking multiple pouch cells in the casing, an electrode tabs extending from an end of the pouch battery cell toward the beam structure along a length direction of the pouch battery cell, a thermally conductive structural adhesive disposed between the battery cell stack and the lower case base plate, and a foaming adhesive filling a space between the electrode tabs and the beam structure. The solution can construct a pouch CTP battery pack based on the pouch cells, which has a good protective effect on the battery cell stack formed by stacking pouch battery cells and is easy to assemble, so as to improve the overall stability of the battery pack.