Battery Pack Heating Unit for Vertical Temperature Uniformity
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Solution Overview
Problem
Conventional battery packs experience temperature variations between modules stacked vertically due to uneven heat distribution from heat generators, leading to potential thermal issues.
Innovation Solution
A battery pack design with a heating unit positioned closer to the lower battery module, incorporating a heat generator, nonwoven fabric, air layer, and thermally conductive films to evenly distribute heat and reduce temperature differences between upper and lower modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat generator is provided between stacked battery modules to heat them, then the battery modules can be heated in cold conditions, but temperature variation occurs between upper and lower battery modules due to upward heat transfer
Solution Approach 1:
The patent applies local quality by providing insulation material specifically at the lower surface of the upper battery module where heat transfer occurs, rather than uniformly insulating all surfaces. This targeted insulation approach addresses the specific heat transfer problem between modules while maintaining thermal efficiency elsewhere.
Solution Approach 2:
The patent introduces insulation material as an intermediary substance between the heat generator and the upper battery module, and between stacked modules. This intermediary reduces direct thermal coupling and controls heat flow direction, preventing excessive upward heat transfer that causes temperature variation.
2Volume of stationary object
If battery modules are stacked vertically to save space, then the battery pack density increases, but temperature distribution becomes uneven due to heat rising upward
Solution Approach 1:
The patent applies local quality by providing insulation material specifically at the lower surface of the upper battery module where heat transfer occurs, rather than uniformly insulating all surfaces. This targeted insulation approach addresses the specific heat transfer problem between modules while maintaining thermal efficiency elsewhere.
Solution Approach 2:
The patent introduces insulation material as an intermediary substance between the heat generator and the upper battery module, and between stacked modules. This intermediary reduces direct thermal coupling and controls heat flow direction, preventing excessive upward heat transfer that causes temperature variation.
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 effectively suppresses temperature variations between stacked battery modules, ensuring consistent thermal conditions and preventing thermal deterioration, as demonstrated by reduced temperature differences over time.
Implementation Method 1
a heating unit provided between the first battery module and the second battery module, the heating unit being configured to heat the first battery module and the second battery module. The heating unit includes a heat generator
Implementation Method 2
a structure having a heat generator, such as a heater, between the battery modules stacked upwardly/downwardly can be conceived in order to heat the battery modules when starting driving in a cold district
Data Source
AI summary
A battery pack includes: a lower battery module; an upper battery module stacked vertically upwardly of the lower battery module; and a heating unit provided between the lower battery module and the upper battery module, the heating unit being configured to heat the lower battery module and the upper battery module. The heating unit includes a heating line disposed at a position closer to the lower battery module relative to the upper battery module in a stacking direction of the lower battery module and the upper battery module. According to such a configuration, there can be provided a battery pack in which temperature variation is suppressed between battery modules stacked upwardly/downwardly.