Battery Distribution Unit Heat Exchanger Cap Thermal Management
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Solution Overview
Problem
Battery distribution units (BDUs) face challenges in heat dissipation due to the density and tight spacing of circuit components, leading to potential damage from excessive heating during high current or short circuit situations.
Innovation Solution
The BDU design incorporates a housing with a heat exchanger cap that is thermally coupled to the battery case, utilizing thermal interface elements and heat spreaders to efficiently dissipate heat from circuit components into the battery case, which acts as a heat sink, enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If circuit components are densely packed in the BDU housing to reduce space, then the BDU size is reduced, but heat dissipation becomes difficult and components may overheat
Solution Approach 1:
A heat exchanger cap is introduced as an intermediary component between the fixed contacts and the battery case. The cap includes heat transfer surfaces that are in thermal communication with the fixed contacts and transfer heat to the battery case, which acts as a heat sink. This mediator enables effective heat dissipation from densely packed components without increasing BDU size.
2Temperature
If heat sinks or airflow are provided for heat dissipation, then heat dissipation improves, but the tight spacing and density of components make it difficult to implement these solutions
Solution Approach 1:
The battery case itself is utilized as a heat sink to dissipate heat from the circuit components. The heat exchanger cap transfers heat from the fixed contacts directly to the battery case, eliminating the need for separate heat sinks or complex airflow systems. The existing battery case structure serves the dual purpose of housing batteries and providing thermal management.
3Volume of moving object
If the BDU housing is made compact to improve integration, then space utilization improves, but access for maintenance and repair becomes difficult
Solution Approach 1:
The BDU housing is divided into multiple accessable sections with removable covers that provide access to different circuit components. The heat exchanger cap and other components are arranged to allow maintenance personnel to access and service individual components without disassembling the entire housing, maintaining compactness while enabling ease of repair.
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 solution effectively reduces the risk of component damage by efficiently transferring and dissipating heat, ensuring reliable operation under high load conditions.
Implementation Method 1
The heat exchanger cap is in thermal communication with the fixed contacts of the contactor and is configured to be in thermal communication with the battery case of the battery module to dissipate heat from the fixed contacts into the battery case of the battery module
Data Source
AI summary
A battery distribution unit includes a housing having a bottom mounted to a battery case of a battery module and having a component cavity with a contactor therein. The contactor has fixed contacts having terminating ends extending from a bottom end of a contactor housing. The BDU includes terminals at the bottom end of the contactor coupled to the terminating ends and a heat exchanger cap at the bottom end of the contactor. The heat exchanger cap is provided in the component cavity in thermal communication with the fixed contacts and in thermal communication with the battery case of the battery module to dissipate heat from the fixed contacts into the battery case of the battery module.