Battery Cell Bottom Support Recess Layout for Thermal Uniformity
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Solution Overview
Problem
Traditional battery cells are prone to thermal runaway due to significant temperature differences between the inner and outer layers of the jelly roll, which is not effectively addressed by existing designs.
Innovation Solution
A bottom support with a bottom plate featuring gradually increasing recessed areas from the peripheral to the central region, enhancing electrolyte absorption capacity and heat dissipation, thereby reducing temperature differences and preventing thermal runaway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional battery cell designs are used, then the structure is simple and easy to manufacture, but significant temperature differences occur between inner and outer layers of the jelly roll leading to thermal runaway
Solution Approach 1:
The bottom plate is designed with non-uniform recessed areas that vary by location - the peripheral region has smaller recessed areas while the central region has larger recessed areas. This local variation optimizes electrolyte absorption at different positions, with the central region receiving more electrolyte to cool the hotter inner layers of the jelly roll, thereby addressing thermal runaway through spatially differentiated heat dissipation
Solution Approach 2:
The bottom plate is segmented into multiple recessed areas rather than having a single uniform structure. These segmented recesses are distributed across the bottom plate with varying sizes, creating multiple localized electrolyte reservoirs that target specific heat generation zones within the jelly roll structure
2Temperature
If uniform recessed areas are used across the bottom plate, then the structure is simple to manufacture, but temperature differences between central and peripheral regions of the jelly roll are not effectively reduced
Solution Approach 1:
The bottom plate employs local quality variation with differently sized recessed areas positioned strategically - smaller recesses at the periphery and larger recesses at the center. This design creates localized electrolyte absorption zones that correspond to the thermal profile of the jelly roll, where the central region generates more heat and thus requires greater electrolyte contact for cooling
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 achieves uniform heat distribution across the jelly roll, reducing the likelihood of thermal runaway and extending the battery cell's service life.
Implementation Method 1
the bottom plate is constructed to form one or more recessed groups, each recessed group includes one or more recesses
Implementation Method 2
more heat is taken away by the electrolyte, leading to a smaller temperature difference between an inner layer and an outer layer of the jelly roll
Data Source
AI summary
This application relates to a bottom support for battery cell, a battery cell, a battery, and an electric device. The bottom support is configured for supporting a jelly roll, and the bottom support includes a bottom plate, where the bottom plate includes a central region and a peripheral region surrounding the central region. The bottom plate is constructed to form at least one recessed group, and a recessed area increases gradually among the recessed group(s) in a direction from the peripheral region to the central region of the bottom plate. The bottom support for battery cell, the battery cell, the battery, and the electric device provided in this application reduce the probability of thermal runaway in the battery cell.