Thermal management method

Abstract

The invention mainly discloses a thermal management method adopting immersed cooling, which comprises the following steps of: providing a battery pack which comprises a heat conduction shell, a plurality of battery cells and a convection space, and arranging the battery cells and the convection space in the heat conduction shell; performing vacuum pumping on the battery pack; the battery cells are immersed in a dielectric liquid, the dielectric liquid forms a natural convection in the convection space for heat transfer, and the dielectric liquid comprises a plurality of filler particles for reducing the viscosity of the dielectric liquid.

Description

Thermal management methods Technical Field

[0001] The present invention relates to a thermal management method, and in particular to a thermal management method for a battery pack. Background Art

[0002] Although traditional immersion cooling using flowing liquid has excellent cooling effect, it requires additional cooling circuits and

[0003] A high power pump is used to cool the viscous immersion liquid.

[0004] Summary of the Invention

[0005] One embodiment of the present invention provides a passive thermal management method using immersion cooling, comprising:

[0006] A battery pack is provided, comprising a heat-conductive housing, a plurality of battery cells, and a convection space, wherein the battery cells and the convection space are disposed in the heat-conductive housing;

[0007] Vacuuming the battery pack;

[0008] The battery cells are immersed in dielectric fluid, wherein the dielectric fluid forms a natural convection in the convection space to perform heat transfer, wherein the dielectric fluid includes a plurality of filler particles for reducing a viscosity of the dielectric fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a diagram illustrating a thermal management method according to an embodiment of the present invention;

[0010] FIG2 is a method for mixing dielectric fluid and filler particles according to an embodiment of the present invention;

[0011] FIG3 shows another method of mixing dielectric fluid and filler particles according to an embodiment of the present invention.

[0012] Legend:

[0013] <The present invention>

[0014] 4 battery packs

[0015] 41 thermal conductive housing

[0016] 42 battery cells

[0017] 43 Convection Space

[0018] Step a: Provide battery pack

[0019] Step b: Vacuum the battery pack

[0020] Step c: Immerse the battery cell in the dielectric fluid

[0021] Step d: Heat conduction connection of the temperature plate to the battery pack

[0022] Step m11: Filling the convection space with filler particles

[0023] Step m12: Dielectric fluid and filler particles are mixed

[0024] Step m21: Dielectric fluid and filler particles are mixed

[0025] Step m22: The mixed dielectric fluid and filler particles are filled into the convection space. DETAILED DESCRIPTION

[0026] Figure 1 illustrates an embodiment of a thermal management method according to the present invention. In step a, a battery pack including a convection space is provided. In one embodiment, the battery pack includes a thermally conductive housing, such as an aluminum housing, containing a plurality of battery cells, and convection spaces disposed between the battery cells and between the battery cells and the thermally conductive housing.

[0027] Step b: vacuum evacuating the battery pack to remove air from the convection space.

[0028] In step c, a dielectric fluid is filled into the convection space, submerging the battery cells. In one embodiment, functional filler particles are used to enhance the properties of the dielectric fluid, such as reducing viscosity or increasing the relative dielectric constant. In one embodiment, the viscosity of the dielectric fluid can be reduced to a level that allows convection to become the primary mechanism for heat transfer.

[0029] Step d: Connect the vapor chamber to the battery pack's thermally conductive housing. This achieves passive thermal management from the inside out through two-phase heat transfer from the vapor chamber and natural convection of the dielectric fluid.

[0030] In one embodiment, a silane coupling agent is used to modify the surface of micron-sized alumina filler particles, effectively eliminating particle agglomeration and reducing internal friction between particles in the dielectric fluid. In another embodiment, the coupling agent treatment improves the rheological behavior of the dielectric fluid, resulting in a more uniform distribution of filler particles within the dielectric fluid.

[0031] In one embodiment, the filler particles, after being surface-treated with a coupling agent, allow the dielectric fluid to generate natural convection in the convection space as the battery core heats up. Natural convection then transfers heat from the battery core to the thermally conductive casing of the battery pack.

[0032] Figure 2 illustrates an embodiment of a method for mixing a dielectric fluid and functional filler particles according to the present invention. In step m11, the filler particles are placed in the convection space. Following step b, the battery pack is vacuum-evacuated. Next, in step m12, the dielectric fluid is filled into the convection space and uniformly mixed with the filler particles.

[0033] Figure 3 illustrates another embodiment of a method for mixing a dielectric fluid and functional filler particles according to the present invention. In step m21, the dielectric fluid and filler particles are uniformly mixed. Following step b, the battery pack is vacuum-evacuated. Next, in step 22, the mixed dielectric fluid and filler particles are filled into the convection space.

Claims

1. A thermal management method, comprising: A battery pack is provided, comprising a heat-conductive housing, a plurality of battery cells, and a convection space, wherein the battery cells and the convection space are disposed in the heat-conductive housing; Vacuuming the battery pack; The battery cells are immersed in dielectric fluid, wherein the dielectric fluid forms a natural convection in the convection space to perform heat transfer, wherein the dielectric fluid includes a plurality of filler particles for reducing a viscosity of the dielectric fluid.

2. The thermal management method of claim 1, further comprising: A temperature averaging plate is provided, which is thermally connected to the thermally conductive housing, wherein a two-phase heat transfer is generated in the temperature averaging plate.

3. The thermal management method of claim 1 , further comprising: The dielectric fluid and the filler particles are uniformly mixed.

4. The thermal management method according to claim 1, wherein: The dielectric fluid includes the filler particles for increasing a relative dielectric constant of the dielectric fluid.

Images