WO2021134445A1

WO2021134445A1 - Immersed heat dissipation system

Info

Publication number: WO2021134445A1
Application number: PCT/CN2019/130427
Authority: WO
Inventors: 李婉艺; 朱冰; 金浩; 吴安兵; 汪广武
Original assignee: 广州高澜节能技术股份有限公司
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-07-08

Abstract

An immersed heat dissipation system, comprising: a cooling box (10) used for accommodating a battery pack (1), the inner part of the cooling box (10) having a cooling liquid (20); a heat exchange assembly (30) used for heat exchange of the cooling liquid (20); a liquid outlet pipe assembly (40), one end of which is connected to the upper end of the cooling box (10), and the other end of which is connected to the heat exchange assembly (30); a liquid inlet pipe assembly (50), one end of which is connected to the lower end of the cooling box (10), and the other end of which is connected to the heat exchange assembly (30); and a cooling liquid pump (60), which is provided on the liquid outlet pipe assembly (40) or the liquid inlet pipe assembly (50), and is used to drive the cooling liquid (20) to flow. In the present immersed heat dissipation system, the battery pack (1) is completely immersed in the cooling liquid (20), and the battery pack (1) is in direct contact with the cooling liquid (20) for heat exchange, so that the heat transfer efficiency is improved. On the other hand, the cooling box (10), the liquid outlet pipe assembly (40) and the liquid inlet pipe assembly (50) enable the battery pack (1) to make even contact with the liquid, thereby making the temperature of the battery pack (1) more consistent, which is helpful for the operation of the battery pack (1) and prolongs the service life of the battery pack (1).

Description

Submerged cooling system

Technical field

The invention relates to the technical field of heat dissipation of vehicle-mounted power batteries, in particular to an immersion type heat dissipation system.

Background technique

With the implementation of the national sustainable development strategy, new energy electric vehicles have developed rapidly and are increasingly recognized by consumers. The power battery system of an electric vehicle is to connect each battery with a small energy in series or in parallel, and form a battery pack through the assembly of parts and components to provide power for the electric vehicle.

After the battery pack works for a long time, each single cell will heat up. If the temperature of the battery pack is too high or too low, it will damage the battery pack, affect the normal operation of the battery pack, and even cause a safety accident. Therefore, the thermal management of on-board power batteries is a key issue for the development of new energy electric vehicles.

However, the thermal management methods of the vehicle-mounted power battery, such as air cooling, liquid-cooled flat tube surrounding cooling, etc., cannot dissipate heat evenly for all parts of the battery pack, and it is difficult to ensure uniform temperature of the battery pack.

Summary of the invention

In view of the above-mentioned problems, the present invention provides an immersion type heat dissipation system, which is in direct contact with the battery pack, can dissipate heat evenly for the battery pack, and ensure a uniform temperature of the battery pack.

The technical solutions adopted by the present invention to solve its technical problems are:

A submerged heat dissipation system includes a cooling box for accommodating battery packs, the cooling box has a cooling liquid inside; a heat exchange assembly for cooling liquid heat exchange; a liquid outlet pipe assembly, one end of which is connected to the cooling box The upper end and the other end are connected to the heat exchange assembly; the liquid inlet pipe assembly, one end of which is connected to the lower end of the cooling box, and the other end is connected to the heat exchange assembly; and a coolant pump, which is arranged on the liquid outlet pipe assembly or the On the liquid inlet pipe assembly, it is used to drive the coolant flow.

According to the submerged heat dissipation system according to the first aspect of the present invention, the heat exchange assembly includes a cyclically connected heat exchanger, a compressor and a condenser.

According to the submerged heat dissipation system according to the first aspect of the present invention, the heat exchange assembly further includes an HVAC assembly, and the HVAC assembly is connected in parallel with the heat exchanger.

According to the submerged heat dissipation system according to the first aspect of the present invention, the heat exchanger is a plate heat exchanger.

According to the submerged heat dissipation system according to the first aspect of the present invention, an electric heater is provided on the liquid outlet pipe assembly or the liquid inlet pipe assembly.

According to the submerged heat dissipation system according to the first aspect of the present invention, the liquid outlet pipe assembly includes two liquid outlet pipes, and the two liquid outlet pipes are respectively connected to the left and right sides of the upper end of the cooling box.

According to the submerged heat dissipation system according to the first aspect of the present invention, the liquid inlet pipe assembly includes two liquid inlet pipes, and the two liquid inlet pipes are respectively connected to the left and right sides of the lower end of the cooling box.

According to the submerged heat dissipation system according to the first aspect of the present invention, a temperature sensor is provided in the cooling box.

According to the submerged heat dissipation system according to the first aspect of the present invention, the coolant pump is a fluorinated pump.

According to the immersion type heat dissipation system according to the first aspect of the present invention, the cooling liquid is 3M FC40 electronic fluorinated liquid.

The beneficial effects of the present invention: the submerged heat dissipation system includes a cooling box, a heat exchange assembly, a liquid outlet pipe assembly, a liquid inlet pipe assembly and a cooling liquid pump. This submerged heat dissipation system completely immerses the battery pack in the coolant, and the battery pack directly contacts the coolant to exchange heat, which improves the heat transfer efficiency; on the other hand, the cooling box, the liquid outlet pipe assembly and the liquid inlet pipe assembly make The battery pack evenly contacts the liquid, which in turn promotes the temperature of the battery pack to become more uniform, which is beneficial to the operation of the battery pack and prolongs the life of the battery pack.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings that need to be used in the description of the embodiments. Obviously, the drawings described are only a part of the embodiments of the present invention, rather than all the embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work:

Figure 1 is a schematic diagram of the structure of the present invention.

Detailed ways

This section will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description of the text part of the manual with graphics, so that people can understand the present invention intuitively and vividly. Each technical feature and overall technical solution of the invention cannot be understood as a limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation description involved, such as up, down, front, back, left, right, etc. indicates the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, but only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be configured and operate in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

In the description of the present invention, several means one or more, multiple means two or more, greater than, less than, exceeding, etc. are understood to not include the number, and above, below, and within are understood to include the number. If it is described that the first and second are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly specifying the number of the indicated technical features or implicitly specifying the order of the indicated technical features relationship.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

1, an immersed heat dissipation system of this embodiment includes a cooling box 10, a heat exchange assembly 30, an outlet pipe assembly 40, an inlet pipe assembly 50, and a coolant pump 60 to form a circulation loop to uniformly cool the battery pack 1.

The battery pack 1 is formed by assembling parts and components in series or in parallel. It is worth noting that this system is also suitable for heat dissipation of various vehicle-mounted power battery packs and electronic components.

Among them, the cooling box 10 is used for accommodating the battery pack 1. The cooling tank 10 has a cooling liquid 20 inside. The cooling liquid 20 enters and exits the cooling box 10 through the liquid inlet pipe assembly 50 and the liquid outlet pipe assembly 40, and exchanges heat through the heat exchange assembly 30. The battery pack 1 is completely immersed in the cooling box 10 to dissipate heat evenly.

In this embodiment, the cooling liquid 20 is 3M FC40 electronic fluorinated liquid, and 3M FC40 electronic fluorinated liquid is a high boiling point fluorinated liquid. Fluorinated liquid is a fluorine chemical with excellent electrical insulation, thermal conductivity and chemical stability. Its boiling point is 155°C, thermal conductivity is 0.067W/m·K, and freezing point is -57°C.

The heat exchange assembly 30 is used for heat exchange of the cooling liquid 20. Specifically, the heat exchange assembly 30 includes a heat exchanger 31, a compressor 32, and a condenser 33 that are cyclically connected. The coolant pipeline in the heat exchanger 31 is connected to the inlet pipe assembly 50 and the outlet pipe assembly 40, respectively, for the passage of the coolant 20, and the condensate pipeline of the heat exchanger 31 is connected to the compressor 32 and the condenser 33. A circulation loop is formed to cool the coolant 20 entering the heat exchanger 31.

One end of the outlet pipe assembly 40 is connected to the upper end of the cooling box 10, and the other end of the outlet pipe assembly 40 is connected to the heat exchange assembly 30. Specifically, the outlet pipe assembly 40 includes two outlet pipes 41. The two outlet pipes 41 are respectively connected to the left and right sides of the upper end of the cooling box 10, so as to ensure that the cooling liquid 20 is evenly discharged from the left and right sides of the upper end of the cooling box 10. The diameter of the liquid outlet pipe 41 is generally the same. In this embodiment, two liquid outlet pipes 41 are merged into a pipeline and connected to the heat exchanger 31. In some embodiments, the two liquid outlet pipes 41 may also be connected to the heat exchanger 31 respectively.

One end of the liquid inlet pipe assembly 50 is connected to the lower end of the cooling box 10, and the other end of the liquid inlet pipe assembly 50 is connected to the heat exchange assembly 30. Specifically, the liquid inlet pipe assembly 50 includes two liquid inlet pipes 51, and the two liquid inlet pipes 51 are respectively connected to the left and right sides of the lower end of the cooling box 10, so as to ensure that the cooling liquid 20 enters uniformly from the left and right sides of the lower end of the cooling box 10. The diameter of the liquid inlet pipe 51 is generally the same. In this embodiment, the two liquid inlet pipes 51 are separated by one pipe, and this pipe is connected to the heat exchanger 31. In some embodiments, the two liquid inlet pipes 51 may also be connected to the heat exchanger 31 respectively. In addition, the two liquid inlet pipes 51 and the two liquid outlet pipes 41 work together to ensure that the coolant 20 enters and exits uniformly from the cooling box 10, ensures that the heat dissipation effect of the battery pack 1 is continuously uniform, and prevents the battery pack 1 from heating due to local overheating. Out of control, to ensure the service life of the battery pack 1.

The cooling liquid pump 60 is arranged on the liquid outlet pipe assembly 40 or the liquid inlet pipe assembly 50, and the cooling liquid pump 60 is used to drive the cooling liquid 20 to flow. In this embodiment, the cooling liquid pump 60 is arranged on the liquid inlet pipe assembly 50. In some embodiments, the cooling liquid pump 60 is provided on the liquid outlet pipe assembly 40. The cooling liquid pump 60 is a fluorinated pump, which is adapted to the cooling liquid 20 of this embodiment.

Further, referring to FIG. 1, the heat exchange assembly 30 further includes an HVAC assembly 34, and the HVAC assembly 34 is connected in parallel with the heat exchanger 31. The HVAC assembly 34 is a vehicle-mounted HVAC assembly, which is connected in parallel with the heat exchanger 31 and can provide a lower temperature liquid as a condensate to exchange heat with the coolant 20. The heat exchanger 31 is a plate heat exchanger.

Further, an electric heater 70 is provided on the liquid outlet pipe assembly 40 or the liquid inlet pipe assembly 50. In this embodiment, the electric heater 70 is arranged on the liquid inlet pipe assembly 50. The electric heater 70 is suitable for heating and cooling the heat 20 when the temperature is low in winter, so as to prevent the battery pack 10 from being too cold.

Furthermore, a temperature sensor is provided in the cooling box 10 for sensing the temperature in the cooling box 10. In this embodiment, the temperature sensor can work in cooperation with the electric heater 70 and the heat exchange assembly 30. When the temperature sensor senses that the temperature of the coolant 20 is high, the heat exchange assembly 30 starts to exchange heat for the coolant 20; when the temperature sensor senses that the temperature of the coolant 20 is high or low, the electric heater 70 starts to exchange heat for the coolant 20. Heat it up.

In this embodiment, when the temperature sensor senses that the temperature is higher than 35°C, the coolant pump 60 and the heat exchange assembly 30 are turned on, and the electric heater 70 is turned off to cool the coolant 20; when the temperature sensor senses that the temperature is low At 0° C., the coolant pump 60 and the electric heater 70 are turned on, the heat exchange assembly 30 is turned off, and the coolant 20 is heated and insulated to ensure the working environment temperature of the battery pack 1 in the cooling box 10.

In this immersion heat dissipation system, on the one hand, the battery pack 1 is completely immersed in the cooling liquid 20, and the battery pack 1 and the cooling liquid 20 are directly contacted for heat exchange, and the heat transfer efficiency is improved; on the other hand, in the cooling box 10, the liquid The tube assembly 40 and the liquid inlet tube assembly 50 make the battery pack 1 evenly contact the liquid, thereby promoting the temperature of the battery pack 1 to be more uniform, which is beneficial to the operation of the battery pack 1 and prolongs the life of the battery pack 1.

The above-mentioned embodiment is a further description of the above-mentioned content of the present invention, but it should not be understood that the scope of the above-mentioned subject of the present invention is limited to the above-mentioned embodiment, and all technologies implemented based on the above-mentioned content belong to the scope of the present invention.

Claims

A submerged heat dissipation system, which is characterized in that it comprises

A cooling box for accommodating the battery pack, the cooling box has a cooling liquid inside;

Heat exchange components, used for cooling liquid heat exchange;

A liquid outlet pipe assembly, one end of which is connected to the upper end of the cooling box, and the other end is connected to the heat exchange assembly;

A liquid inlet pipe assembly, one end of which is connected to the lower end of the cooling box, and the other end is connected to the heat exchange assembly; and

The cooling liquid pump is arranged on the liquid outlet pipe assembly or the liquid inlet pipe assembly for driving the flow of the cooling liquid.
The submerged heat dissipation system according to claim 1, wherein the heat exchange assembly includes a cyclically connected heat exchanger, a compressor and a condenser.
The submerged heat dissipation system according to claim 2, wherein the heat exchange assembly further comprises an HVAC assembly, and the HVAC assembly is connected in parallel with the heat exchanger.
The submerged heat dissipation system according to claim 2, wherein the heat exchanger is a plate heat exchanger.
The submerged heat dissipation system according to claim 1, wherein an electric heater is provided on the liquid outlet pipe assembly or the liquid inlet pipe assembly.
The submerged heat dissipation system according to claim 1, wherein the liquid outlet pipe assembly includes two liquid outlet pipes, and the two liquid outlet pipes are respectively connected to the left and right sides of the upper end of the cooling box.
The submerged heat dissipation system according to claim 1, wherein the liquid inlet pipe assembly includes two liquid inlet pipes, and the two liquid inlet pipes are respectively connected to the left and right sides of the lower end of the cooling box.
The submerged heat dissipation system according to claim 1, wherein a temperature sensor is provided in the cooling box.
The submerged heat dissipation system according to claim 1, wherein the coolant pump is a fluorinated pump.
The submerged heat dissipation system according to claim 9, wherein the cooling liquid is 3M FC40 electronic fluorinated liquid.