Battery Pack Side Plate Fixation Against Cell Restraint Forces
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Solution Overview
Problem
In cell-to-pack type battery packs, there is a challenge in firmly fixing the members arranged around the battery cells, as the restraint force from the battery cells can lead to instability and potential entry of foreign matter.
Innovation Solution
A battery pack design featuring a lateral plate portion connected to a plate member via a connection member, with an optional resin member for sealing and absorbing thermal deformation differences, ensuring firm fixation and preventing foreign matter entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If members are simply arranged around battery cells without additional fixation structures, then the device complexity is reduced, but the reliability of fixing members firmly together deteriorates due to reaction forces from battery cells
Solution Approach 1:
The first case side portion is segmented into a longitudinal plate portion and a lateral plate portion that protrudes laterally. This segmentation allows the lateral plate portion to specifically engage with the second case side portion through connection members, providing targeted fixation at critical locations while maintaining overall structural simplicity.
Solution Approach 2:
Connection members (such as bolts or rivets) are introduced as intermediary elements between the lateral plate portion of the first case side portion and the second case side portion. These connection members firmly fix the members together by directly addressing the reaction forces from battery cells, thereby improving fixation reliability without requiring complete redesign of the entire case structure.
2Reliability
If members are firmly fixed together using additional connection structures, then the reliability of fixation is improved, but the ease of manufacture deteriorates due to additional assembly steps
Solution Approach 1:
The lateral plate portion protruding from the longitudinal plate portion creates predetermined connection locations that simplify the assembly process. Connection members can be directly installed at these protruding locations without requiring complex positioning or additional alignment steps, thereby maintaining ease of manufacture while achieving reliable fixation.
3Object-affected harmful factors
If the case structure is simplified without lateral plate portions, then the device complexity is reduced, but foreign matter can enter between members due to insufficient sealing
Solution Approach 1:
The lateral plate portion creates a layered structure where the first case side portion and second case side portion are firmly connected through connection members. This segmented design provides predetermined sealing locations that prevent foreign matter from entering between members, while the overall case structure remains relatively simple without requiring additional sealing components.
Data Source
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AI summary
A battery pack includes: a plurality of stacked battery cells (11); a first member (23) having a longitudinal plate portion (27) and a lateral plate portion (26), the longitudinal plate portion (27) being in abutment with a battery cell (11) in a stacking direction of the battery cells (11), reaction force in the stacking direction of the battery cells (11) being applied to the longitudinal plate portion (27) from the plurality of battery cells (11), the lateral plate portion (26) protruding from the longitudinal plate portion (27) in a direction of the reaction force; and a second member (31) overlapping with the lateral plate portion (26) in a thickness direction of the lateral plate portion (26); and a connection member (50) that connects the lateral plate portion (26) to the second member (31).