Battery Pack Heat Dissipation Structure for FET Thermal Isolation
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Solution Overview
Problem
Battery packs face heat dissipation challenges due to the high temperature generated by the field effect transistors (FETs) in the protection circuit module, which can deteriorate the battery pack's characteristics and make it difficult to visually measure the degree of swelling.
Innovation Solution
A battery pack design incorporating a heat dissipation structure with a heat dissipation element, including a metal layer with aluminum, that covers the FETs and is detachably arranged on a heat dissipator, providing efficient heat dissipation by creating a heat insulation space and using a fixing bracket to securely attach the heat dissipation element to the protection circuit module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection circuit module with FETs is used to protect the battery pack, then the reliability of the battery pack is improved, but heat is generated that can deteriorate the battery pack characteristics
Solution Approach 1:
The patent extracts the heat dissipation function from the protection circuit module by adding a separate heat dissipator. The heat dissipator is positioned to receive heat from the FETs and transfer it to the case, separating the protection function from the heat management function. This allows the protection circuit to operate reliably while the heat is actively managed by the dedicated heat dissipation structure.
Solution Approach 2:
The heat dissipator acts as an intermediary between the heat-generating FETs and the battery pack components. It provides a thermal pathway that directs heat away from sensitive components through the case to the external environment, preventing heat accumulation that would otherwise deteriorate battery characteristics.
2Volume of stationary object
If the battery pack structure is made compact, then the volume is reduced, but it becomes difficult to visually measure the degree of swelling
Solution Approach 1:
The patent applies a color-changing material to the case that changes color in response to swelling or temperature changes. This allows visual detection of battery pack status without increasing the overall volume. The color change provides a clear visual indicator that enables users to monitor battery health and swelling within the compact form factor.
3Temperature
If a heat dissipator is added to manage heat from FETs, then heat dissipation performance is improved, but the device complexity increases
Solution Approach 1:
The heat dissipator is merged with the existing case structure, utilizing the case as part of the heat dissipation pathway. The heat dissipator contacts the case, which then conducts heat to the external environment. This integration approach allows effective heat management while minimizing the addition of separate components and maintaining structural 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 heat dissipation structure effectively discharges heat generated by the FETs to the outside, preventing heat transfer to the battery pack and allowing for visual measurement of swelling, while maintaining a compact size without increasing the battery pack's dimensions.
Implementation Method 1
a heat dissipation element (154), including a metal layer with aluminum
Implementation Method 2
define a heat insulation space between the heat dissipation element and the first heat dissipation surface
Data Source
AI summary
One or more embodiments relate to a battery pack including a heat dissipation structure. The battery pack according to one or more embodiments includes a case, an electrode assembly in the case, and including an electrode tab, a protection circuit module connected to the electrode tab, a fixing bracket at least partially surrounding the protection circuit module, and a heat dissipator outside the fixing bracket and including a heat dissipation element.