Battery Module Compressing Element for Thermal Management
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Solution Overview
Problem
High-power battery systems, particularly those with lithium-ion cells, face challenges in efficient thermal management due to heating from chemical conversion processes, requiring effective active thermal management systems to prevent overheating and ensure reliable operation over their service life.
Innovation Solution
A battery module design featuring prismatic lithium-ion cells arranged in a longitudinal direction with a compressing element and thermally conductive adhesive connection between the housing and cell bottoms, along with a supporting element and clamping elements, to enhance heat conduction and mechanical stability, ensuring reliable accommodation and thermal decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermally conductive adhesive is used to connect battery cells to housing, then heat transfer is improved, but mechanical strength of the connection deteriorates
Solution Approach 1:
A compressing element is introduced as an intermediary component between the battery cells and housing. This element applies continuous compressive force to maintain thermal contact between the adhesive layers and battery cell bottoms, compensating for the low mechanical strength of thermally conductive adhesives while ensuring effective heat transfer from the battery cells to the housing.
Solution Approach 2:
The adhesive connection parameters are optimized by using thermally conductive adhesives with specific thermal conductivity properties, and the compressing element is designed to apply appropriate compressive force. This combination allows the system to achieve sufficient thermal contact while the mechanical load is primarily borne by the compressing element rather than the adhesive alone.
2Stability of the object's composition
If battery cells are tightly fixed in housing, then mechanical stability is improved, but thermal management efficiency deteriorates
Solution Approach 1:
The housing is designed with locally optimized thermal management features, including integrated cooling channels positioned directly adjacent to the battery cell bottoms. The compressing element ensures localized thermal contact at the cell-housing interface while allowing the rest of the cell structure to maintain its mechanical integrity and stability.
3Ease of manufacture
If adhesive connection is used between housing and battery cells, then manufacturing simplicity is improved, but reliability of thermal contact deteriorates
Solution Approach 1:
The compressing element is pre-installed in the housing before the battery cells are placed. This preliminary action ensures that when the cells are installed and the adhesive is applied, the compressing element immediately begins to apply compressive force, maintaining reliable thermal contact from the outset and compensating for any adhesive layer imperfections or shrinkage during curing.
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
This design improves heat transfer and mechanical load distribution, reducing stress on the adhesive connections and preventing failure, thereby increasing the reliability and efficiency of temperature control within the battery module, allowing for the use of adhesives with lower strength values and better thermal conductivity.
Implementation Method 1
a bottom surface of the housing of the battery module and a bottom surface of the battery cells are respectively cohesively connected to one another by means of an adhesive, in particular in an adhesively bonded manner. Here, the adhesive can preferably contain thermally conductive additives
Implementation Method 2
A compressing element is arranged between the housing of the battery module and the plurality of battery cells in the longitudinal direction of the battery module
Data Source
AI summary
The invention relates to a battery module having a plurality of prismatic battery cells (2, 20), which are arranged next to one another in a longitudinal direction (4) of the battery module (1) and furthermore are braced with one another, wherein the plurality of battery cells (2) are received in an interior (30) of a housing (3) of the battery module (1) and additionally a bottom surface (31) of the housing (3) of the battery module (1) and a bottom surface (21) of the battery cells (2) are respectively cohesively connected to one another, wherein a compressing element (11) is arranged between the housing (3) and the plurality of battery cells (2) in the longitudinal direction (4) of the battery module (1), which compressing element tapers perpendicularly to the longitudinal direction (4) of the battery module (1) in the direction of the bottom surface (31) of the housing (3).