Long-Thin Battery Cell Layout for High-Rate Heat Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries experience increased heat generation during rapid charging and discharging, leading to reduced service life and safety performance due to inadequate heat dissipation.
Innovation Solution
The design of a cell with a cell body having a length-to-thickness ratio greater than 7 and the inclusion of multiple tabs arranged along the length direction, which enhances heat dissipation by allowing for timely discharge of heat outside the cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the lithium-ion battery is rapidly charged or discharged at high rate, then the charging speed is improved, but the heat generation is increased and heat dissipation becomes inadequate
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric dimensions of the cell body, specifically setting the length-to-thickness ratio L/H≥6 to enhance heat dissipation capability. This dimensional parameter adjustment allows for improved thermal management during high-rate charging and discharging operations, enabling faster charging speeds while controlling temperature rise through enhanced surface area-to-volume ratio for heat dissipation.
2Productivity
If the heat is not discharged to the outside timely, then the charging performance is maintained, but the service life and safety performance are severely affected
Solution Approach 1:
The patent utilizes parameter changes by defining specific geometric ratios (L/H≥6) to optimize the cell body dimensions, thereby enhancing heat dissipation efficiency. This dimensional optimization ensures that heat generated during high-rate charging can be discharged timely, maintaining both charging performance and reliability by preventing thermal accumulation that would otherwise degrade service life and safety.
Solution Approach 2:
The patent applies dimensionality change by considering the three-dimensional geometric configuration of the cell body, specifically the length-to-thickness ratio. By optimizing this dimensional parameter, the patent enhances the surface area available for heat dissipation relative to the volume generating heat, enabling effective thermal management that preserves both charging performance and long-term reliability without compromising either aspect.
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
Improves heat dissipation performance, thereby extending the service life and enhancing safety of lithium-ion batteries, making them more suitable for market promotion.
Implementation Method 1
heat generated by the battery is increased, resulting in a relatively high temperature rise. If the heat is not discharged to the outside timely
Implementation Method 2
heat dissipation performance of the cell is improved, and the heat inside the cell is discharged to the outside timely
Data Source
AI summary
Disclosed are a cell and a secondary battery. The cell includes a cell body; a length of the cell body is L, and a thickness of the cell body is H; and the L and the H satisfy the following relational expression: L/H>7. According to the cell and the secondary battery provided in the disclosure, by reasonably designing a relationship between the length L and the thickness H of the cell body, that is, a ratio between the length L and the thickness H of the cell body is defined within a specific relational expression of L/H>7, the heat dissipation performance of the cell is improved, and the heat inside the cell is discharged to the outside timely, such that the service life and safety performance of the secondary battery are improved, thereby having a higher potential for market promotion.