ES2901576B2 - HYBRID SYSTEM OF THERMAL CONDITIONING OF ELECTRICAL BATTERIES - Google Patents

Description

DESCRIPTION

HYBRID BATTERY THERMAL CONDITIONING SYSTEM

ELECTRICAL

TECHNICAL SECTOR

The present invention belongs to the field of technology, and more specifically to the field of electric batteries.

The main object of the present invention is a hybrid (liquid-air) thermal conditioning system for electric batteries that allows greater heat dissipation inside a battery pack than conventional systems. This greater heat dissipation allows to reduce the stress of the batteries, extending their useful life and obtaining a greater performance of these. Additionally, the main object of the present invention allows, on specific occasions, to be able to establish which of the two systems is in operation when they do not work in unison with the consequent energy savings.

BACKGROUND OF THE INVENTION

There are currently several battery thermal conditioning systems.

Among the most common, the thermal conditioning systems by air, by means of forced ventilation, and liquids, by means of refrigerant fluid circulation.

In the case of air systems, the air inside the battery that is in contact with the cells is normally renewed by means of fans. In the case of liquid systems, a liquid fluid is normally circulated between the cells.

Each of these systems has advantages and disadvantages. Liquid systems mean greater efficiency, more compactness and tightness, but greater weight and cost. Air systems involve less cost and weight, but occupy more volume, have a very limited tightness and are less efficient.

EXPLANATION OF THE INVENTION

The hybrid system for thermal conditioning of electric batteries object of the invention combines a liquid dissipation system by plates that are conditioned by a refrigerant circulation system, but without the need to pass between all the cells and combines it with a forced ventilation system through the end of some dissipation sheets that protrude from the cells that are in contact.

The inventor of the system object of the invention has designed a hybrid thermal conditioning system that comprises heat dissipation sheets, housed between the battery cells, which in turn are attached by means of tabs to a thermal conditioning plate with ducts through which circulates a cooling liquid. At one of the ends of the dissipation sheet there is an extension of it, which is exposed to forced air circulation. With which a combined air and liquid thermal conditioning system is obtained.

The dissipation sheets are all in contact, through two of the folded tabs, with the bodies of the thermal conditioning plates through which the coolant circulates. In this way they act as extensions of the cooling liquid thermal conditioning plate to reach more difficult to access locations, as well as having a larger contact surface with the cell for better heat dissipation, but without having to pass the liquid between all the cells, saving cost and volume compared to traditional liquid thermal management systems.

The elements of the system are detailed below:

The cells, which in the figures of this document are flat, but which could also be cylindrical, are located orthogonally to the plane of contact with the thermal conditioning plates and in parallel with the dissipating sheets. These cells are subjected to pressure between the dissipation sheets.

On the other hand, there is the dissipation sheet. This lamina surrounds the cell by the lower part serving in some way as a bowl to house it and protect it mechanically. This sheet has two of its four ends bent at 90° by means of tabs. In one of the four ends that is not bent, it extends, like a fin, that exceeds the limit of the thermal conditioning plates, so that said fin is exposed to the forced air flow.

Additionally, there is the thermal conditioning plate. This plate is a cuboid-shaped block, through which coolant circulates.

BRIEF DESCRIPTION OF THE DRAWINGS

To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of its practical embodiment, a set of figures is attached as an integral part of said description. where, by way of illustration and not limitation, the following has been represented:

Figure 1 shows an isometric view of the system according to the present invention.

Figure 2 shows an exploded isometric view of the system according to the present invention.

PREFERRED EMBODIMENT OF THE INVENTION

In view of the aforementioned figures, and in accordance with the adopted numbering, an example of a preferred embodiment of the invention can be observed, which comprises the parts and elements that are indicated and described in detail below.

As can be seen in figure 1, the hybrid system for thermal conditioning of electric batteries (1), object of the invention, in its preferred embodiment, comprises a dissipation sheet (2) that is arranged in contact with the cell (3) by the part with the largest surface (4), transfers the heat to the plates of thermal conditioning (5) by the two bent tabs (6) of the dissipation sheet (2). Also, at one of the four ends of the dissipation sheet (2) that is not bent, it extends, as a fin (11), which exceeds the limit of the thermal conditioning plates (5), so that said fin (11) is exposed to the forced air flow.

The dissipation sheet (2) has four holes (7) in the four corners of the flat surface that allow the stacked arrangement, by means of four separators (8), of more cells and dissipation sheets (not shown in the figures) by means of its sliding by some threaded studs (9) that are fixed to the base of the battery chassis (10). The dissipation sheet (2) and the thermal conditioning plates (5) are made of metal or composite material.

In turn, the thermal conditioning plates (5) have internal pipes through which the coolant circulates.

Claims (1)

1. Hybrid system for thermal conditioning of electric batteries (1), comprising a dissipation sheet (2), which, arranged in contact with the cell (3) on the part with the largest surface area (4), transfers heat to the plates of thermal conditioning (5) by two of the bent fins (6) of the dissipation sheet (2). Likewise, the dissipation sheet (2) has a fin (11) at one of the unfolded ends that extends allowing exposure to circulating air and thus contributes to better thermal conditioning. The dissipation sheet (2) has four holes (7) in the four corners of the flat surface that allow stacking, by means of four separators (8), more cells (3) and dissipation sheets (2) (not shown in the figures) by sliding through threaded studs (9) that are fixed to the base of the battery chassis (10). In turn, a cooling liquid circulates through the thermal conditioning plates (5).