Pouch Secondary Battery Adhesive Structure for Shock Resistance
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Solution Overview
Problem
Secondary batteries face insufficient physical durability, particularly in maintaining the integrity of the electrode assembly under external shocks.
Innovation Solution
A secondary battery design incorporating an outer package member with a flexible pouch-shaped structure, containing a battery device with a positive and negative electrode wound configuration, and using an adhesive tape with a non-heat adhesive layer and a heat adhesive layer (oriented polystyrene) to secure the battery device within the package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single adhesive layer is used to fix the battery device to the outer package member, then the structure is simple, but the physical durability and shock resistance are insufficient
Solution Approach 1:
The adhesive member is divided into two distinct layers: a first adhesive layer (non-heat adhesive) and a second adhesive layer (heat adhesive). This segmentation allows each layer to perform its specific function - the first layer provides initial adhesion and positioning, while the second layer provides enhanced bonding strength and shock resistance when heated, thereby improving physical durability without excessive complexity.
Solution Approach 2:
The adhesive member uses a composite structure combining two different adhesive materials with complementary properties. The non-heat adhesive layer provides immediate bonding, while the heat-adhesive oriented polystyrene layer provides reinforced bonding under thermal conditions. This composite approach resolves the contradiction by achieving superior reliability through material combination rather than simple duplication.
2Reliability
If oriented polystyrene film is used to improve shock resistance, then the adhesive property improves, but the manufacturing process becomes more complex
Solution Approach 1:
The oriented polystyrene adhesive layer is pre-formed as part of the adhesive member structure before battery assembly. This preliminary preparation allows the heat-adhesive properties to be activated during the bonding process without requiring complex post-assembly treatments. The structure is designed to undergo thermal activation at a specific stage, simplifying the overall manufacturing flow while maintaining shock resistance.
Solution Approach 2:
The oriented polystyrene layer utilizes temperature as a control parameter to activate its adhesive properties. During manufacturing, heating is applied to transform the material from a non-adhesive state to a highly adhesive state, enabling strong bonding. This parameter-based control allows for precise timing of the bonding action and simplifies the manufacturing process by using a fundamental physical property rather than complex chemical treatments.
3Stability of the object's composition
If the electrode assembly is tightly fixed to prevent displacement, then the structural integrity improves, but the flexibility of the pouch structure is reduced
Solution Approach 1:
The adhesive member is strategically positioned at specific locations where bonding is most critical - typically at the corners or edges of the battery device. This localized adhesion approach provides sufficient structural integrity to prevent displacement and maintain stability, while leaving the majority of the pouch structure flexible and adaptable. The quality of fixation is concentrated where needed rather than uniformly distributed.
Solution Approach 2:
The adhesive member acts as an intermediary element between the rigid battery device and the flexible pouch structure. It provides the necessary bonding strength to prevent displacement and maintain structural integrity, while its material properties and application method allow the pouch to retain its flexibility and adaptability. The intermediary absorbs the mechanical stress, protecting both the battery device and pouch structure.
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 enhances physical durability by securely fixing the battery device, preventing displacement and damage during shocks, thereby improving the battery's structural integrity.
Implementation Method 1
the heat adhesive layer is adhered to the battery device and includes oriented polystyrene
Implementation Method 2
an oriented polystyrene film is attached to an outer surface of an electrode assembly
Data Source
AI summary
A secondary battery includes an outer package member, a battery device, and an adhesive member. The outer package member has flexibility. The battery device is contained inside the outer package member, and includes a positive electrode and a negative electrode. The positive electrode and the negative electrode are opposed to each other and are wound. The adhesive member is disposed between the outer package member and the battery device. The adhesive member is adhered to each of the outer package member and the battery device. The positive electrode and the negative electrode are wound in such a manner that the positive electrode or the negative electrode is disposed in an outermost wind. The adhesive member includes a non-heat adhesive layer and a heat adhesive layer. The non-heat adhesive layer is adhered to the outer package member. The heat adhesive layer is adhered to the battery device and includes oriented polystyrene.