CN212230580U - A two-phase immersion battery liquid cooling device using phase change materials for energy storage - Google Patents

Abstract

The utility model belongs to the technical field of power batteries, and provides a two-phase submerged battery liquid cooling device which utilizes phase-change materials for energy storage. By filling the interior of the fins with phase change material, the heat released by the power battery can be absorbed only by the phase change material inside the fins when the electric vehicle is running for a short distance, without opening the cooling system, saving the electric vehicle during short-distance running. Cooling energy consumption. When the electric vehicle is running for a long time, the phase change material inside the fins can be used to absorb the heat generated by the power battery. When the phase change material is completely melted, the cooling system is turned on to cool the battery and the phase change material. The whole process is realized. The cooling energy consumption is minimized, which greatly improves the cruising range of electric vehicles during long-distance driving.

Description

A two-phase immersion battery liquid cooling device using phase change materials for energy storage

technical field

The utility model belongs to the technical field of power batteries, in particular to a two-phase submerged battery liquid cooling device utilizing phase-change materials for energy storage

Background technique

my country is the country with the largest number of automobiles at present. The pollution problem caused by automobiles has brought a very severe test to our country. Therefore, increasing efforts to develop new energy vehicles has become an urgent problem to be solved in the sustainable development of the automobile industry. The power battery is the heart of the car, which affects the performance of the electric vehicle in all aspects. In order to make the power battery work stably, it is necessary to reasonably control the temperature of the battery. Therefore, the battery thermal management system is very important for the power battery.

In the current thermal management of power batteries, there are mainly four heat dissipation methods, namely air-cooled, liquid-cooled, phase-change material cooling, and refrigerant direct cooling. The use of phase change materials for cooling has attracted the attention of many scholars due to its simple structure and low energy consumption. However, due to the low thermal conductivity of the phase change material and the limited quality of the battery box that can accommodate the phase change material, the cooling of the phase change material alone cannot absorb heat in time under high-rate discharge or long-term discharge conditions.

In view of the above-mentioned disadvantages of using phase change material alone to cool the battery, the utility model proposes a two-phase immersed battery liquid cooling device using phase change material for energy storage. When the electric vehicle is running for a short distance, the heat released by the power battery can be absorbed only by the phase change material inside the fin, without opening the cooling system, which saves the cooling energy consumption of the electric vehicle when driving for a short distance. When the electric vehicle is driving for a long time, the phase change material inside the fins can be used to absorb the heat generated by the power battery. When the phase change material is completely melted, the cooling system is turned on to cool the battery and the phase change material. The whole process realizes cooling. The energy consumption is minimized, which greatly improves the cruising range of electric vehicles during long-distance driving.

Utility model content

The technical problem solved by the utility model is to provide a two-phase immersed battery liquid cooling device that utilizes phase-change materials for energy storage. The phase-change materials are filled inside the fins, so that the electric vehicle only relies on the fins during short-distance driving. The internal phase change material can absorb the heat released by the power battery without opening the cooling system, which saves the cooling energy consumption of the electric vehicle during short-distance driving.

The technical scheme of the present utility model:

A two-phase immersed battery liquid cooling device utilizing phase-change materials for energy storage, comprising a battery 1, a box body 2, an upper cover plate 3 of the box body, a cooling coil 4, fins 5, a fluorinated liquid 6 and a phase-change material 7;

The upper cover plate 3 of the box body is covered above the battery 1, and the battery 1 is located at the bottom of the box body 2; the cooling coil 4 is arranged inside the upper cover plate 3 of the box body, and is connected with the external cooling system; the fins 5 are hollow structures, The hollow structure is filled with phase change material 7, the fins 5 are installed on the inner surface of the upper cover plate 3 of the box body, the box body 2, the upper cover plate 3 of the box body and the fins 5 are connected by screws, using the form of compression gaskets Sealing; the battery 1 is fully or partially immersed in the fluoride solution 6; when the battery 1 starts to work, the temperature gradually rises, and the heat generated by the battery 1 is taken away by the filled fluoride solution 6, when the fluoride solution 6 does not When the boiling point is reached, the fluorinated liquid 6 utilizes sensible heat to absorb the heat generated by the battery module; when the surface temperature of the battery module rises above the boiling point of the fluorinated liquid 6, the fluorinated liquid 6 begins to boil, and the fluorinated liquid 6 produced by the boiling The steam condenses on the surface of the fin 5, and the heat released by the condensation is absorbed by the phase change material 7 inside the fin; It absorbs heat and gradually melts. When the phase change material is completely melted, the cooling system is turned on, and the cooling medium inside the cooling coil 4 is used to take away the heat released by the condensation of the vapor of the fluorinated liquid 6 and cool the phase change material.

The battery 1 is a square battery, a cylindrical battery or a soft pack battery.

The melting point of the phase change material 7 is between 20°C and 60°C.

The boiling point of the fluorination solution 6 under 1 atmosphere is between 20°C and 50°C.

The fins 5 are hollow structures.

There is a regular boss structure below the upper cover plate 3 of the box body, which is used to increase the contact area of the upper cover plate 3 of the box body with the fins 5 and the phase change material 7 .

The space formed between the upper cover plate 3 of the box and the fins 5 is sealed, and the sealed space is used for filling the phase change material 7 .

Beneficial achievements of the present utility model:

1) When the electric vehicle is driving for a short distance, the heat released by the power battery can be absorbed only by the phase change material inside the fin, without opening the cooling system, which saves the cooling energy consumption of the electric vehicle when driving for a short distance.

2) When the electric vehicle is running for a long time, the phase change material inside the fins can be used to absorb the heat generated by the power battery. When the phase change material is completely melted, the cooling system is turned on to cool the battery and the phase change material. The whole process is realized. In order to minimize cooling energy consumption, the cruising range of electric vehicles during long-distance driving is greatly improved.

Description of drawings

FIG. 1 is a front view of a two-phase submerged battery liquid cooling device utilizing phase change materials for energy storage.

FIG. 2 is an exploded schematic diagram of a two-phase submerged battery liquid cooling device utilizing phase change materials for energy storage.

Figure 3(a) is a schematic structural diagram of an assembly of an upper cover plate and a fin of a box body.

Figure 3(b) is a schematic structural diagram of the upper cover plate of the box body.

Figure 3(c) is a schematic diagram of the structure of the fin.

Fig. 3(d) is a schematic structural diagram of the upper cover plate and the fin assembly of the box body cut along the A-A plane shown in Fig. 3(a).

In the picture: 1 battery; 2 box body; 3 box body upper cover; 4 cooling coil; 5 fins; 6 fluorinated liquid; 7 phase change material.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

In order to facilitate the understanding of the present utility model, the present utility model will be more fully described below with reference to the related drawings. However, it should be understood that these descriptions are only intended to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

The utility model discloses a two-phase submerged battery liquid cooling device utilizing phase change materials for energy storage, comprising: a battery 1, a box body 2, an upper cover plate 3 of the box body, a cooling coil 4, fins 5, a fluoride Liquid 6, phase change material 7; the battery 1 is located at the bottom of the box 2; the cooling coil 4 is arranged inside the upper cover plate 3 of the box, and is connected to the external cooling system; the fin 5 is a hollow structure, and the hollow structure is used for Filling the phase change material 7, the box body 2, the upper cover plate 3 of the box body and the fins 5 are connected by screws, and sealed in the form of compression gaskets; the battery 1 is fully or partially immersed in the fluoride solution 6; when the battery When starting to work, the temperature gradually increases, and the heat generated by the battery is taken away by the filled fluoride solution. When the fluoride solution does not reach the boiling point, the fluoride solution uses sensible heat to absorb the heat generated by the battery module; When the surface temperature rises above the boiling point of the fluorinated liquid, the fluorinated liquid begins to boil, and the fluorinated liquid vapor generated by the boiling condenses on the surface of the fin 5, and the heat released by the condensation is absorbed by the phase change material 7 inside the fin. With the continuous operation of the battery, the heat generation of the battery continues to increase, and the phase change material inside the fins continuously absorbs heat and gradually melts. When the phase change material is completely melted, the cooling system is turned on and the cooling inside the cooling coil 4 is used. The working fluid takes away the heat released by the condensation of the fluorinated liquid vapor and cools the phase change material.

Figure 1 shows a front view of a two-phase immersed battery liquid cooling device using phase change materials for energy storage. In this example, a group of six battery modules is taken as an example. Two-phase submerged battery liquid cooling device will be described. The battery 1 can be a cylindrical battery, a prismatic battery or a soft pack battery, and a prismatic battery is used in this example. The box body 2 , the upper cover plate 3 of the box body and the fins 5 are connected by screws, and sealed in the form of compression gaskets. The box body 2 is provided with a liquid filling pipe (not shown in the drawings), which is used to evacuate the closed space formed by the box body 2 and the upper cover plate 3 of the box body and fill the fluorinated liquid.

The fluorination solution 6 has a boiling point of 20°C to 50°C under 1 atmosphere. In this example, the HFE-7000 fluorination solution produced by 3M formula is used, and its boiling point is 34°C, which has good performance. Dielectric properties and excellent flame retardancy. The battery should be fully or partially immersed in the fluoride solution, in this example the battery is mostly submerged in the fluoride solution.

As shown in Figure 2, an exploded schematic diagram of a two-phase immersed battery liquid cooling device using phase change materials for energy storage. It can be seen that the two-phase immersed battery liquid cooling device using phase change materials to assist heat dissipation is mainly composed of three parts. They are the upper cover plate of the box body, the fins and the box body. The space formed by the fins and the box body and the space formed by the upper cover plate of the box body and the fins are all sealed.

Figure 3(a) is a schematic diagram of the structure of the box upper cover plate and the fin assembly. The assembly consists of two parts, the box upper cover plate shown in Figure 3(b) and the box body shown in Figure 3(b) respectively. The fin shown in 3(c). It can be seen from Figure 3(b) that there are regular boss structures under the upper cover plate 3 of the box. In addition, a cooling coil is arranged inside it to absorb the heat released by the condensation of the fluorinated liquid vapor and cool the phase change material. In this example, the cooling medium circulating inside the cooling coil is R134a.

As shown in Figure 3(d), it is a schematic structural diagram of the box upper cover plate and the fin assembly after cutting along the A-A plane shown in Figure 3(a). It can be seen that the gap between the fin and the box upper cover plate is The formed space is airtight and is used for storing the phase change material 7 . The melting point of the phase change material 7 is between 20°C and 60°C. In this example, the selected phase change material is octadecane, and its melting point is 28.2°C. It can be seen from the cross-sectional view that the regular boss structure below the upper cover of the box is in contact with the fins, thus increasing the contact area between the upper cover 3 of the box, the fins 5 and the phase change material 7 .

When the electric vehicle is running for a short distance, the temperature of the battery keeps rising as the work progresses, and the heat generated by the battery is taken away by the filled fluorine liquid. In the initial stage of heat dissipation, the fluorinated liquid uses its own sensible heat to absorb the heat generated by the battery. As the battery continues to work, the heat generated by the battery continues to increase. When the surface temperature of the battery rises to the boiling point of the fluoride solution, the fluoride solution begins to boil, and the fluoride solution vapor produced by the boiling condenses on the surface of the fins 5. The released heat is absorbed by the phase change material 7 inside the fin. During short-distance driving, part of the phase change material melts due to absorbing the heat released by the condensation of the fluorinated liquid vapor. When the vehicle stops running, the melted phase change material 7 gradually solidifies to the initial state, and the whole process does not need to open the active cooling system.

When the electric vehicle travels for a long time, the temperature of the battery keeps rising as the work progresses, and the heat generated by the battery is taken away by the filled fluorine liquid. In the initial stage of heat dissipation, the fluorinated liquid uses its own sensible heat to absorb the heat generated by the battery. As the battery continues to work, the heat generated by the battery continues to increase. When the surface temperature of the battery rises to the boiling point of the fluoride solution, the fluoride solution begins to boil, and the fluoride solution vapor produced by the boiling condenses on the surface of the fins 5. The released heat is absorbed by the phase change material 7 inside the fin. In the long-distance driving state, as the battery continues to work, the heat generation of the battery continues to increase, and the phase change material inside the fins continuously absorbs heat and gradually melts. When the phase change material is completely melted, the cooling system is turned on, and the cooling medium circulating inside the cooling coil 4 takes away the heat released by the condensation of the fluorinated liquid vapor and cools the phase change material, so that the electric vehicle is in a long-distance driving state. The battery can still be effectively thermally managed.

To sum up, the utility model discloses a two-phase immersed battery liquid cooling device utilizing phase-change materials for energy storage. By filling the phase change material inside the fin, the electric vehicle can absorb the heat released by the power battery only by relying on the phase change material inside the fin during short-distance driving, without opening the cooling system, saving the electric vehicle during short-distance driving. Cooling energy consumption.

The above-mentioned specific examples illustrate the technical solutions and beneficial effects of the present disclosure in detail. It should be understood that the above-mentioned specific examples are only specific examples of the present disclosure and do not limit the present invention. The size and shape of the various elements in the figures do not reflect actual size and proportions, but merely represent the contents of this example. Any modifications, improvements and equivalent replacements made within the principles and spirit of the present disclosure are within the protection scope of the present disclosure.

Claims (7)

1. A two-phase immersed battery liquid cooling device utilizing phase-change material to store energy is characterized by comprising a battery (1), a box body (2), a box body upper cover plate (3), a cooling coil (4), fins (5), fluorinated liquid (6) and phase-change material (7);

wherein the upper cover plate (3) of the box body is covered above the battery (1), and the battery (1) is positioned at the bottom of the box body (2); the cooling coil (4) is arranged inside the upper cover plate (3) of the box body and is connected with an external cooling system; the fin (5) is of a hollow structure, a phase-change material (7) is filled in the hollow structure, the fin (5) is installed on the inner surface of the upper cover plate (3) of the box body, the box body (2), the upper cover plate (3) of the box body and the fin (5) are connected through screws, and sealing is carried out in a compression gasket mode; the battery (1) is totally or partially immersed in the fluorinated liquid (6); when the battery (1) starts to work, the temperature is gradually increased, the heat generated by the battery (1) is taken away by the filled fluorinated liquid (6), and when the fluorinated liquid (6) does not reach the boiling point, the fluorinated liquid (6) absorbs the heat generated by the battery module by using sensible heat; when the surface temperature of the battery module rises above the boiling point of the fluorinated liquid (6), the fluorinated liquid (6) starts to boil, vapor of the fluorinated liquid (6) generated by boiling is condensed on the surface of the fin (5), and heat released by condensation is absorbed by the phase-change material (7) in the fin; along with the continuation of battery (1) work, the heat production of battery (1) constantly increases, and the phase change material of fin (5) inside constantly absorbs the heat and melts gradually, when this phase change material is whole to melt, opens cooling system, utilizes the inside cooling working medium of cooling coil (4) to take away the heat that fluoride liquid (6) steam condensation was given off and to cool down phase change material.

2. The liquid cooling device of the two-phase immersed battery for storing energy by utilizing the phase-change material as claimed in claim 1, wherein the battery (1) is a prismatic battery, a cylindrical battery or a pouch battery.

3. The liquid cooling device of the two-phase immersed battery for storing energy by using the phase-change material as claimed in claim 1 or 2, wherein the melting point of the phase-change material (7) is between 20 ℃ and 60 ℃.

4. The liquid cooling device of the two-phase immersed battery for storing energy by utilizing the phase-change material as claimed in claim 1 or 2, wherein the boiling point of the fluorinated liquid (6) at 1 atmosphere is between 20 ℃ and 50 ℃.

5. The two-phase immersed battery liquid cooling device utilizing phase change material for energy storage according to claim 4, wherein the fin (5) is of a hollow structure.

6. The two-phase immersed battery liquid cooling device utilizing the phase change material for energy storage according to claim 1, 2 or 5, wherein a regular boss structure is arranged below the upper cover plate (3) of the box body, and is used for increasing the contact area of the upper cover plate (3) of the box body, the fin (5) and the phase change material (7).

7. The two-phase immersed battery liquid cooling device utilizing the phase change material for energy storage is characterized in that the space formed between the upper cover plate (3) of the box body and the fin (5) is closed, and the closed space is filled with the phase change material (7).

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