Wraparound Battery Pack Heater for Cell Temperature Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery packs experience significant temperature deviation and non-uniform heating due to the limited contact of conventional heating members with battery cell stacks, leading to varying charge capacity and lifespan differences among cells.
Innovation Solution
A battery pack design with a heating member wrapped around three outer surfaces of the battery cell stack, utilizing a resistance heating element within an insulative pad, and equipped with temperature sensors to adjust heat generation based on individual cell temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat heating member is applied to the lower surface of the battery cell stack, then the heating member can be easily installed, but the heating area is limited and temperature deviation between battery cells increases
Solution Approach 1:
The heating member transitions from a two-dimensional flat structure to a three-dimensional wraparound structure that contacts the battery cell stack at multiple surfaces (lower surface and side surfaces), increasing the heating area and improving temperature uniformity across all battery cells
Solution Approach 2:
The heating member is divided into multiple heating sections (first heating section for the lower surface, second heating section for the side surfaces) that can be independently configured to contact different surfaces of the battery cell stack, ensuring comprehensive and uniform heating coverage
2Volume of moving object
If battery cells are arranged in tight contact with the battery pack case, then the battery pack structure is compact, but heat dissipation from outer battery cells becomes excessive causing temperature deviation
Solution Approach 1:
The heating member provides localized heating to the side surfaces of the battery cell stack where heat loss occurs, compensating for the excessive heat dissipation from outer battery cells while maintaining the compact tight-contact structure with the battery pack case
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 solution reduces temperature deviation among battery cells, ensuring uniform heating and maintaining optimal charge capacity, thereby extending the lifespan and efficiency of the battery pack.
Implementation Method 1
a heating member disposed along three of the outer surfaces of the battery cell stack in the state of being in tight contact therewith
Data Source
AI summary
A battery pack capable of inhibiting the occurrence of temperature deviations between battery cells in a battery cell stack includes a battery cell stack having a plurality of battery cells stacked in tight contact with each other; a heating member disposed along and in contact with three outer surfaces of the battery cell stack; a temperature sensor connected to each of the battery cells; and a battery pack case configured to receive the battery cell stack, the heating member, and the temperature sensors. The heating member has a structure including a first surface, a second surface, and a third surface.