Battery pack cooling system and aircraft comprising same

Abstract

The invention relates to the technical field of batteries, in particular to a battery pack cooling system which comprises a battery box, a cover plate, cooling liquid and a battery pack. The cover plate is erected at the top of the battery box, and the battery box and the cover plate define a sealed space; the cooling liquid is arranged in the sealed space; the battery pack is arranged in the battery box, and the cooling liquid is used for cooling the battery pack.

Description

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] When the aircraft takes off vertically, the motor power is relatively high. At this time, the battery pack will continue to discharge at a high rate, the chemical reaction inside the battery cell will intensify, a large amount of chemical energy will be converted into electrical energy, and a large amount of heat energy will be generated. At this time, we need to use effective means to conduct the heat of the battery pack to the outside space. The current more mature soft-pack battery heat dissipation solution is to add aluminum sheets between the battery cells and bond them together with the battery cells through thermal conductive structural adhesive. The battery heat is first transferred to the aluminum plate and finally transferred out by the aluminum plate; this heat dissipation solution is more suitable for general low-rate battery packs, but not very adaptable to high-rate battery packs, and the heat dissipation performance is poor. Summary of the invention

[0003] An object of the present invention is to provide a battery pack cooling system.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A battery pack cooling system, comprising:

[0006] 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;

[0007] A coolant, the coolant being placed in the sealed space;

[0008] A battery pack is placed in the battery box, and the coolant is used to cool the battery pack.

[0009] Preferably, the end plate on the cover plate is provided with a water inlet and a water outlet for circulation of the coolant.

[0010] Preferably, the flow rates of the water inlet and the water outlet are 0.5-1 L / min.

[0011] Preferably, the water temperature of the coolant at the water inlet is 24 degrees Celsius to 26 degrees Celsius.

[0012] Preferably, the battery box is composed of four side panels and a bottom panel.

[0013] Preferably, the coolant is a fluorinated liquid.

[0014] Preferably, 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.

[0015] Preferably, the coolant absorbs the heat of the battery pack and evaporates when the temperature reaches 40 degrees Celsius.

[0016] Preferably, the fluorinated liquid is an insulating liquid with good insulation properties.

[0017] To achieve this object, the present invention also adopts the following technical solutions:

[0018] An aircraft, comprising a battery pack cooling system as described in the above solution.

[0019] Beneficial effects of the present invention:

[0020] 1. This application adopts immersion cooling technology to immerse the battery pack in a non-conductive liquid, which can keep the battery working in the optimal temperature range below 40 degrees Celsius, improve the consistency of the temperature of multiple battery pack cells, and extend the service life of the battery;

[0021] 2. When a battery cell in the module experiences thermal runaway, the coolant can react quickly when it reaches the boiling point, taking away the heat in the module and minimizing the impact of thermal runaway.

[0022] 3. The coolant of the present application evaporates and condenses after encountering the cover plate, and forms a water droplet film after condensation. When the water droplets accumulate to a certain extent, they will fall back into the battery box for recycling, which is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the overall schematic diagram of the battery pack cooling system;

[0024] Figure 2 This is a schematic diagram of the coolant absorbing heat, rising and evaporating. DETAILED DESCRIPTION

[0025] The following embodiments further illustrate the technical solution of the present application. It is to be understood that the specific embodiments described herein are only used to explain the present application. It should also be noted that, for ease of description, only the parts related to the present application are shown in the drawings, not all.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] The present 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 the top of the battery box 1, and the battery box 1 and the cover plate 2 are enclosed to form a sealed space; the coolant is placed in the sealed space; the battery pack 3 is placed in the battery box 1, and the coolant is used to cool the battery pack 3.

[0029] Furthermore, the end plate on the cover plate 2 is provided with a water inlet and a water outlet for the circulation of the water inlet and the water outlet of the coolant. 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.

[0030] In order to make the battery box 1 have a good water storage function, the battery box 1 is composed of four side panels and a bottom plate. The side panels and the bottom plate are preferably welded so that the coolant will not leak out.

[0031] Preferably, in order to obtain a better insulation effect, the coolant uses an insulating fluorinated liquid.

[0032] 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.

[0033] Specifically, due to the physical properties of the coolant, the coolant evaporates when it absorbs the heat of the battery pack 3 and reaches 40 degrees Celsius.

[0034] The present invention also provides an aircraft, which includes the battery pack cooling system described in the above scheme.

[0035] The above embodiments are merely illustrative of the principles and effects of the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the purpose of the present application. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the relevant technical field without departing from the purpose disclosed in the present application shall still be covered by the claims of the present 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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