Battery Pack Case Insulation Structure With Glue Receiving Grooves
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Solution Overview
Problem
The use of bottom plate-free solutions in battery packs leads to insulation issues due to direct contact between the pack case and unit cells, causing abnormal insulation alarms and potential safety hazards like short circuits and fires, while also complicating the control of glue application thickness.
Innovation Solution
A battery pack case design incorporating insulating strips and buffer sheets to maintain insulation distances and control glue application, featuring insulating strips on the bottom plate and side plates, and buffer sheets to isolate unit cells from the case, with designated glue receiving grooves to manage glue thickness and prevent overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If bottom plate-free solution is adopted to improve energy density, then energy density is improved, but insulation reliability deteriorates due to direct contact between unit cell and pack case
Solution Approach 1:
An insulating buffer sheet is introduced as an intermediary component between the unit cell and the pack case bottom plate. This buffer sheet maintains the insulation distance and prevents direct contact, thereby ensuring insulation reliability while adopting the bottom plate-free solution for improved energy density.
Solution Approach 2:
The bottom plate-free solution is segmented by introducing separate insulating components (buffer sheet and insulating strips) that can be independently controlled and installed, allowing the unit cell to be mounted without a continuous bottom plate while maintaining insulation through discrete insulating elements.
2Use of energy by moving object
If bottom plate-free solution is adopted, then energy density is improved, but manufacturing precision deteriorates due to inability to control glue thickness
Solution Approach 1:
Insulating strips are pre-installed on the bottom plate at predetermined positions before the unit cell is mounted. These pre-positioned strips serve as guides and limits for glue application, ensuring that the glue thickness is controlled and uniform without requiring complex real-time monitoring during assembly.
Solution Approach 2:
The insulating strips act as intermediary elements that define the glue application zone. By placing strips at specific locations, the glue is confined to the space between strips, automatically controlling the glue thickness and preventing overflow while maintaining the bottom plate-free configuration.
3Reliability
If insulating buffer sheet is introduced to maintain insulation distance, then insulation reliability is improved, but device complexity increases
Solution Approach 1:
The insulating buffer sheet is designed with uniform thickness and material properties throughout, providing consistent insulation performance across the entire contact area. This homogeneous design simplifies the selection and installation process compared to complex variable-thickness insulation structures.
Solution Approach 2:
The insulating buffer sheet serves multiple functions simultaneously: it provides insulation, acts as a mechanical buffer, and can be integrated with the mounting structure. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity.
Data Source
AI summary
The present application relates to a battery pack case and a battery pack. The battery pack case includes: a bottom plate and a side plate connected to the bottom plate, the bottom plate and the side plate surround to form an accommodating portion configured to accommodate a unit cell; a plurality of first insulating strips are provided on a surface of the bottom plate facing the accommodating portion, the plurality of first insulating strips are sequentially spaced along a length direction or a width direction of the bottom plate, and a glue receiving groove is formed between two adjacent first insulating strips.