Rechargeable Battery Geometry for High-Current Cooling
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Solution Overview
Problem
Rechargeable batteries for machine tools experience excessive heating during high discharge currents, leading to potential destruction and reduced service life due to thermal runaway, limiting maximum output and discharge capacity.
Innovation Solution
Designing rechargeable batteries with a cell core where no point is more than 5 mm from the surface, enhancing heat dissipation by ensuring a large surface area to volume ratio, and using materials like lithium-ion batteries with capacities of at least 2.2 Ah and sectional areas of at least 40 cm² to facilitate efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rechargeable battery is designed with high capacity (at least 2.2 Ah, preferably at least 2.5 Ah) to provide high outputs, then the power and energy storage are improved, but the heat generation during discharging increases and the risk of thermal runaway worsens
Solution Approach 1:
The patent changes the geometric parameters of the battery by enforcing a maximum distance of 5 mm from any cell core point to the surface. This parameter change allows the battery to maintain high capacity while improving heat dissipation, as the limited distance ensures that heat generated during high-power discharge can be efficiently conducted to the surface and dissipated to the environment.
Solution Approach 2:
The patent introduces a spatial dimension constraint (maximum 5 mm distance from cell core to surface) that transforms the traditional volume-centric battery design into a surface-area-optimized design. This dimensional approach ensures that the surface area is sufficiently large relative to the volume, creating effective heat dissipation pathways without compromising the energy storage capacity.
2Productivity
If the rechargeable battery uses large discharge currents to achieve high outputs, then the power delivery is improved, but the heating effect and risk of destruction increase
Solution Approach 1:
The patent enforces a geometric parameter (maximum 5 mm distance from cell core to surface) that directly addresses the thermal management issue during high-current discharge. This parameter ensures that even under high discharge currents, the heat generated in the cell core can be rapidly conducted to the surface and dissipated, preventing thermal runaway and extending battery service life.
3Duration of action of moving object
If the rechargeable battery has a large capacity (at least 20 Wh, in particular at least 50 Wh, for example at least 200 Wh) to extend operation time, then the duration of action is improved, but the heat accumulation and thermal runaway risk worsen
Solution Approach 1:
The patent applies a geometric parameter constraint (maximum 5 mm distance from cell core to surface) that enables large-capacity batteries to maintain effective heat dissipation. This parameter ensures that as the battery capacity increases, the surface area also increases proportionally, maintaining an effective surface-area-to-volume ratio for heat dissipation and preventing heat accumulation even during extended operation.
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
The solution extends the time to reach a critical temperature, prevents thermal runaway, ensures uniform aging, and increases the service life of the battery while supporting high discharge currents and peak outputs.
Implementation Method 1
The heat of the rechargeable battery that is generated in the cell core during discharging can thus be transported to the surface over a comparatively short distance. The heat can be dissipated from the surface.
Data Source
AI summary
A rechargeable battery for a machine tool, having a cell core is provided, wherein no point within the cell core is at a distance of more than 5 mm away from a surface of the rechargeable battery and the rechargeable battery has a capacity of at least 2.2 Ah. A battery pack and a machine tool are also disclosed.