Core-Shell Composite Binder for Electrode-Level Battery Thermal Control
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Solution Overview
Problem
Existing battery thermal management systems are inadequate for real-time, uniform temperature control at the electrode sheet level, leading to issues such as high-temperature deterioration, low-temperature lithium ion migration, and thermal shock, especially during fast charging and discharging.
Innovation Solution
A composite binder with a core-shell structure, where the core is a phase change material with a temperature range of -10°C to 70°C and the shell is a polymer binder, is applied in the electrode sheet preparation process, allowing for temperature control and heat absorption or release based on environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid cooling is used for battery thermal management, then cooling effect is achieved, but real-time uniform temperature control at electrode sheet level cannot be provided
Solution Approach 1:
The invention segments the thermal management function to the electrode sheet level by incorporating phase change material microcapsules directly into the binder of each electrode sheet. This distributes thermal regulation across multiple independent units (electrode sheets), enabling localized temperature control and achieving uniform temperature distribution throughout the battery pack without requiring complex centralized cooling systems.
Solution Approach 2:
The phase change material microcapsules provide self-regulating thermal management by automatically absorbing excess heat through phase change when temperature rises and releasing heat when temperature drops. This self-service mechanism eliminates the need for external active cooling components, simplifying the thermal management system while maintaining real-time temperature control capability.
2Temperature
If phase change material is added to control temperature, then thermal shock mitigation is improved, but binder strength may be compromised
Solution Approach 1:
The phase change material is nested within polymer shell microcapsules, forming a core-shell structure where the PCM is encapsulated. These microcapsules are then incorporated into the binder matrix. This nested structure protects the PCM from direct contact with electrode materials while allowing thermal energy transfer, maintaining binder strength despite the inclusion of thermal management functionality.
Solution Approach 2:
The invention creates a composite binder system combining polymer binder, phase change material microcapsules, and conductive filler. This composite structure integrates multiple functions: the polymer provides binding strength, the PCM microcapsules provide thermal shock mitigation, and the conductive filler enhances electrical conductivity. The synergistic combination maintains or even improves overall binder performance while adding thermal management capability.
3Reliability
If electrode sheet level thermal management is implemented, then battery performance is improved, but manufacturing process complexity increases
Solution Approach 1:
The invention merges the thermal management function with the existing binder formulation process. The phase change material microcapsules are mixed with other binder components (polymer, conductive filler, solvent) in the same slurry preparation step, and the resulting mixture is applied to electrode sheets using conventional coating equipment. This integration eliminates the need for separate thermal management component installation, maintaining manufacturing simplicity.
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 composite binder effectively manages temperature fluctuations, improving battery performance by mitigating thermal shock and enhancing safety, fast charging capabilities, and maintaining cycle performance across varying temperatures.
Implementation Method 1
A core of the core-shell structure includes a phase change material, and a phase change temperature of the phase change material is -10°C to 70°C
Implementation Method 2
The composite binder can maintain its inherent bonding performance and undergo phase changes according to changes in external environmental temperature (battery temperature), thereby releasing or absorbing heat
Data Source
Figure 1~2
AI summary
A composite binder, a preparation method thereof, and an electrochemical device are provided. The composite binder has a core-shell structure, wherein, a core of the core-shell structure is a phase change material, and a phase change temperature of the phase change material is -10°C to 70°C. A shell of the core-shell structure is a polymer binder. The preparation method includes the following steps: subjecting a mixture of an oil phase and a water phase to shearing treatment and polymerization reaction for production. The oil phase includes the phase change material and a raw material of the polymer binder, and the raw material of the polymer binder at least includes a monomer. The water phase includes water and an emulsifier.