Battery Pack Case Structure for Rigidity and Cell Gas Discharge
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Solution Overview
Problem
Existing battery packs face challenges in maintaining rigidity while improving energy density, and in efficiently discharging gases generated within the battery units.
Innovation Solution
The battery pack design includes a housing with elongated cases for battery units, eliminating the need for a reinforcing part and coupling part, and featuring vent holes and a vent passage for smooth gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing parts and coupling parts are provided in the battery pack, then rigidity is maintained, but space utilization and energy density are deteriorated
Solution Approach 1:
The patent removes the reinforcing part and coupling part from the battery pack structure. The case is designed to inherently provide rigidity without requiring separate reinforcing components, and the coupling between battery modules is achieved through the case structure itself rather than additional coupling parts, thereby eliminating space occupation and improving energy density
Solution Approach 2:
The case is designed to serve multiple functions simultaneously: it provides structural rigidity, couples battery modules together, and defines the boundaries of the battery unit. This multi-functionality eliminates the need for separate reinforcing parts and coupling parts, resolving the contradiction between rigidity and energy density
2Quantity of substance
If battery cells are arranged to maximize space utilization, then energy density is improved, but gas discharge pathways may be blocked
Solution Approach 1:
The case is divided into multiple regions with vent holes positioned at different locations to correspond with different battery cells. This segmentation allows each battery cell to have its own gas discharge pathway through the vent holes and vent passage, ensuring that gas can be discharged efficiently even when battery cells are densely arranged
Solution Approach 2:
The vent holes are positioned on the bottom surface of the case, and the vent passage extends in the vertical direction to discharge gas to the outside. This three-dimensional arrangement of vent holes and passage allows gas discharge pathways to be established without occupying horizontal space that would be needed for battery cell arrangement, thus maintaining high energy density while ensuring proper gas discharge
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 maintains the rigidity of the battery pack without additional reinforcing parts, enhances energy density, and ensures efficient gas discharge, leading to improved performance and efficiency.
Implementation Method 1
a vent passage communicating with the first vent hole and the second vent hole may be provided in the housing
Data Source
AI summary
A battery pack includes a housing, and a plurality of battery units disposed in the housing. Each of the battery units may include: a first battery cell extending in a width direction of the housing; a second battery cell disposed at one side of the first battery cell in the width direction of the housing and aligned in parallel to the first battery cell; and a case extending in parallel to the width direction of the housing to integrally accommodate the first battery cell and the second battery cell. The case may include: a first vent hole facing the first battery cell; and a second vent hole facing the second battery cell. A vent passage communicating with the first vent hole and the second vent hole may be provided in the housing.