Battery Pack Holder Protrusions for Close-Contact Case Cooling
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Solution Overview
Problem
Battery packs face inefficiencies in heat dissipation due to friction reducing sheets acting as thermal resistance and a small contact area between the battery holder and the exterior case, which hinders effective heat dissipation from battery cells.
Innovation Solution
The battery pack design incorporates a battery holder with protruding portions that insert into through holes of the exterior case, creating a high close contact state with heat dissipation sheets, enhancing thermal conductivity and reducing peeling or breakage risks by using materials with specific flexural moduli and tensile elongation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a friction reducing sheet is provided between the heat dissipation sheet and the case, then ease of assembly is improved, but heat dissipation efficiency deteriorates due to thermal resistance
Solution Approach 1:
The patent removes the friction reducing sheet from the heat dissipation path between the heat dissipation sheet and the case. By eliminating this intermediate layer, thermal contact is directly improved while still maintaining assembly ease through the protruding portion and through hole mechanism that guides positioning.
Solution Approach 2:
The protruding portion of the battery holder serves as a positioning intermediary that fits into the through hole of the case, enabling accurate alignment and secure contact between the heat dissipation sheet and case without requiring friction reducing sheets, thus maintaining both assembly ease and heat dissipation efficiency.
2Device complexity
If the contact area between the battery holder and the case is kept small, then device complexity is reduced, but heat dissipation efficiency deteriorates
Solution Approach 1:
The patent extends the heat dissipation interface from a single-point or small-area contact to a multi-dimensional contact surface. The side plates of the case contact multiple surfaces of the battery holder (top surface, bottom surface, and side surfaces), effectively increasing the heat dissipation area without adding complex internal structures.
Solution Approach 2:
The side plates of the case serve multiple functions: they provide structural support, enable positioning through the protruding portion mechanism, and create extensive heat dissipation contact surfaces. This multi-functionality achieves improved heat dissipation without increasing device complexity.
3Manufacturing precision
If the battery holder is made rigid to maintain shape, then manufacturing precision is improved, but reliability deteriorates due to increased peeling or breakage risk
Solution Approach 1:
The patent modifies the mechanical parameters of the battery holder by introducing localized flexibility through the protruding portion design. This allows the holder to maintain overall shape accuracy for manufacturing precision while accommodating thermal expansion and stress distribution to prevent peeling or breakage, thus improving reliability.
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 configuration improves heat dissipation efficiency by ensuring close contact between the heat dissipation sheets and the exterior case, effectively transferring heat generated by battery cells to the outside, while minimizing material deformation and stress on the heat dissipation sheets.
Implementation Method 1
heat dissipation sheets and the exterior case, effectively transferring heat generated by battery cells to the outside
Data Source
AI summary
A battery pack is provided and includes a battery cell assembly including a plurality of battery cells and a battery holder in which the plurality of battery cells are stored; and an exterior case that includes a bottom plate and a plurality of side plates intersecting with the bottom plate at a peripheral edge of the bottom plate and stores the battery holder, in which the battery holder has a side portion facing the side plate of the exterior case, the battery holder is provided with at least one protruding portion protruding from the side portion, the side plate of the exterior case is provided with a through hole into which the protruding portion is inserted, a portion of the battery cell assembly is in contact with an inner surface of the side plate of the exterior case, and a distance between an outer surface corresponding to the first side portion and an outer surface corresponding to the second side portion of the battery cell assembly when the battery holder is not stored in the exterior case is equal to or longer than a distance between the first side plate and the second side plate of the exterior case.