Battery pack cooling system and aircraft comprising same

Abstract

The present invention relates to the technical field of batteries, and in particular to a battery pack cooling system, comprising a battery case, a cover plate, a cooling liquid and a battery pack. The cover plate is disposed at the top of the battery case, the battery case and the cover plate defining a sealed space; the cooling liquid is arranged in the sealed space; the battery pack is arranged in the battery case, the cooling liquid being used for cooling the battery pack.

Description

Battery pack cooling system and aircraft including the same Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack cooling system and an aircraft comprising the same. Background Art

[0002] During vertical takeoff, the motor power is high, and the battery pack continues to discharge at a high rate. Chemical reactions within the cells intensify, converting a significant amount of chemical energy into electrical energy, accompanied by a significant amount of heat. This requires effective means to dissipate this heat from the battery pack to the outside world. A currently established cooling solution for soft-pack batteries involves adding aluminum sheets between the cells, bonding them to the cells with thermally conductive structural adhesive. Heat is first transferred to the aluminum sheet, which then dissipates it. This cooling solution is suitable for typical low-rate battery packs, but is less adaptable to high-rate battery packs and exhibits poor heat dissipation performance.

[0003] Summary of the Invention

[0004] An object of the present invention is to provide a battery pack cooling system.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A battery pack cooling system comprising:

[0007] A battery box and a cover plate, wherein the cover plate is mounted on the top of the battery box, and the battery box and the cover plate together form a sealed space;

[0008] a coolant placed in the sealed space;

[0009] A battery pack is placed in the battery box, and the coolant is used to cool the battery pack.

[0010] Preferably, the end plate on the cover plate is provided with a water inlet and a water outlet for circulation of the coolant.

[0011] Preferably, the flow rate of the water inlet and the water outlet is 0.5-1 L / min.

[0012] Preferably, the water temperature of the coolant at the water inlet is 24 degrees Celsius to 26 degrees Celsius.

[0013] Preferably, the battery box is composed of four side panels and a bottom panel.

[0014] Preferably, the coolant is a fluorinated liquid.

[0015] Preferably, the cover plate is a condensation plate. When the coolant absorbs the heat of the battery pack and evaporates, it encounters the cover plate and condenses on the surface of the cover plate. The heat is carried to the cover plate, completing the heat transfer of the battery pack.

[0016] Preferably, the coolant absorbs the heat of the battery pack and evaporates when the temperature reaches 40 degrees Celsius.

[0017] Preferably, the fluorinated liquid is an insulating liquid with good insulation properties.

[0018] To achieve this object, the present invention also adopts the following technical solutions:

[0019] An aircraft comprises a battery pack cooling system as described in the above solution.

[0020] Beneficial effects of the present invention:

[0021] 1. This application uses immersion cooling technology to immerse the battery pack in a non-conductive liquid, which can keep the battery operating in the optimal temperature range below 40 degrees Celsius, improve the temperature consistency of multiple battery pack cells, and extend the battery life;

[0022] 2. When a battery cell in the module experiences thermal runaway, the coolant reaches the boiling point and can react quickly to remove the heat in the module, minimizing the impact of thermal runaway.

[0023] 3. The coolant of the present application evaporates and condenses after encountering the cover plate, forming a water droplet film after condensation. When the water droplets accumulate to a certain level, they will fall back into the battery box for recycling, which is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an overall schematic diagram of the battery pack cooling system;

[0025] FIG2 is a schematic diagram of the coolant absorbing heat, rising and evaporating. DETAILED DESCRIPTION

[0026] The following embodiments further illustrate the technical solutions of the present application. It is understood that the specific embodiments described herein are merely for the purpose of explaining the present application. It should also be noted that, for ease of description, only portions relevant to the present application are shown in the accompanying drawings, not all of them.

[0027] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application in specific contexts.

[0028] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] This application provides a battery pack cooling system, comprising: a battery box 1, a cover plate 2, a coolant, and a battery pack 3. The cover plate 2 is mounted on top of the battery box 1, and the battery box 1 and the cover plate 2 together form a sealed space; the coolant is placed in the sealed space; and the battery pack 3 is placed in the battery box 1, and the coolant is used to cool the battery pack 3.

[0030] Furthermore, the end plate of the cover plate 2 is provided with a water inlet and a water outlet for circulating the coolant in and out. Preferably, the flow rate of the water inlet and the water outlet is 0.5-1L / min, and the optimal water temperature of the coolant at the water inlet is 24 degrees Celsius to 26 degrees Celsius.

[0031] In order to ensure that the battery box 1 has a good water storage function, the battery box 1 is composed of four side panels and a bottom panel. The side panels and the bottom panel are preferably welded so that the coolant does not leak out.

[0032] Preferably, in order to obtain a better insulation effect, the coolant is a fluorinated liquid with insulating properties.

[0033] Furthermore, the cover plate 2 in the present application is a condensation plate. When the coolant absorbs the heat of the battery pack 3 and evaporates, after encountering the cover plate 2, since the temperature of the cover plate 2 is lower than the coolant after absorbing the heat, the coolant condenses on the surface of the cover plate 2. Therefore, the heat generated in the battery pack is carried to the cover plate 2, completing the heat transfer of the battery pack.

[0034] Specifically, due to the physical properties of the coolant, the coolant evaporates when the coolant absorbs the heat of the battery pack 3 and reaches 40 degrees Celsius.

[0035] The present invention also provides an aircraft, which includes the battery pack cooling system described in the above solution.

[0036] The above embodiments are merely illustrative of the principles and effects of this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the objectives of this application. Therefore, all equivalent modifications or alterations made by persons skilled in the art without departing from the objectives disclosed herein are intended to be covered by the claims of this application.

Claims

1. A battery pack cooling system, characterized in that: include: A battery box and a cover plate, wherein the cover plate is mounted on the top of the battery box, and the battery box and the cover plate together form a sealed space; A coolant, the coolant being placed in the sealed space; A battery pack is placed in the battery box, and the coolant is used to cool the battery pack.

2. The battery pack cooling system according to claim 1, characterized in that: The end plate on the cover plate is provided with a water inlet and a water outlet for the circulation of the coolant.

3. The battery pack cooling system according to claim 2, characterized in that: The flow rates of the water inlet and the water outlet are 0.5-1 L / min.

4. The battery pack cooling system according to claim 3, characterized in that: The water temperature of the coolant at the water inlet is 24 degrees Celsius to 26 degrees Celsius.

5. The battery pack cooling system according to claim 1, characterized in that: The battery box is composed of four side panels and a bottom panel.

6. The battery pack cooling system according to claim 5, characterized in that: The cooling liquid is a fluorinated liquid.

7. The battery pack cooling system according to claim 1, characterized in that: The cover plate is a condensation plate. When the coolant absorbs the heat of the battery pack and evaporates, it condenses on the surface of the cover plate after encountering the cover plate. The heat is carried to the cover plate, completing the heat transfer of the battery pack.

8. The battery pack cooling system according to claim 7, characterized in that: The coolant absorbs the heat of the battery pack and evaporates when the temperature reaches 40 degrees Celsius.

9. The battery pack cooling system according to claim 6, characterized in that: The fluorinated liquid is an insulating liquid with good insulation properties.

10. An aircraft, characterized in that: The aircraft comprises the battery pack cooling system according to any one of claims 1-9.

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