A new type of immersion energy storage cooling module

Abstract

The utility model discloses a novel immersion energy storage cooling module, including an immersion box, a plurality of battery cores and a water cooling plate, wherein the plurality of battery cores are arranged in the immersion box along the length direction of the immersion box, the battery cores are inverted in the immersion box, the immersion box is filled with insulating oil, and the insulating oil immerses the battery cores. The utility model installs a water cooling plate under the top cover of the immersion box, and opens two through holes on the top cover, and the water inlet and outlet of the water cooling plate are connected to the outside through a through hole respectively, so as to bring the heat generated by the battery core and the heat of the insulating oil out of the immersion box, thereby solving the risk of easy leakage of insulating oil in the immersion cooling module.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a novel immersion energy storage cooling module. Background Art

[0002] At present, the cooling methods of battery energy storage systems are mainly air cooling and plate-exchange liquid cooling. Among them, the cooling structure involved in air cooling is simple, easy to install, and low in cost, but the cooling efficiency is not high and cannot meet the heat dissipation requirements of the energy storage system, which will cause a large temperature difference between battery packs, that is, uneven heat dissipation of the battery. Liquid cooling is a thermal management technology that uses liquid as a heat transfer medium, referred to as liquid cooling. The liquid cooling medium has the characteristics of high heat capacity and heat transfer coefficient, and exchanges heat between low-temperature liquid and high-temperature batteries to achieve the purpose of cooling. However, the two cooling methods of air cooling and plate-exchange liquid cooling still have shortcomings such as slow cooling speed and long cooling time.

[0003] Immersion liquid cooling thermal management technology is to directly contact the energy storage battery cell with insulating oil (a composite compound similar to "oil"), completely immerse the battery pack in the insulating cooling oil, and assist the oil circulation system and refrigeration system. The cooling oil is used as a heat dissipation medium to promptly, quickly and efficiently remove the heat generated by the battery, so that the battery cell is kept within the optimal temperature range.

[0004] Since the immersion liquid is in full contact with the battery cell, the temperature difference level of the battery cell can be better controlled; in addition, when non-oil coolant is used, the liquid itself has fire extinguishing ability, achieving the effect of combining temperature control with fire fighting. Depending on the coolant selected, the fully immersed liquid-cooled energy storage system can be divided into three main types: water-based, oil-based, and fluorine-based.

[0005] Disadvantages of immersion battery cooling system:

[0006] 1. System complexity: Compared with traditional cooling methods such as air cooling and liquid cooling, it is necessary to consider issues such as liquid circulation, pressure balance, and foam control, which increases the complexity of the system;

[0007] 2. Weight and volume: Components such as immersion fluid and immersion tank will increase the weight and volume of the battery module, which may reduce the energy density of the battery module and the battery life.

[0008] 3. Battery corrosion: Some commonly used immersion fluids can easily damage the metal parts and seals inside the battery, shortening the battery's service life;

[0009] 4. Temperature control: If the thermal balance of the battery is too good, the internal temperature of the battery module may be too stable, so that the temperature may not be regulated;

[0010] 5. Module packaging: Liquid flows and is prone to leakage, so safety isolation and leakage control are required.

[0011] In summary, although the immersion battery cooling system has many advantages, it must also be weighed and selected according to specific scenarios in engineering applications. At the same time, it is necessary to improve and optimize its system structure, immersion fluid characteristics, etc.

[0012] The immersion fluid plays an important role in the immersion battery cooling system. Its properties must meet the following conditions:

[0013] It has good electrical insulation properties; it is non-flammable and has a high flash point to reduce the risk of fire caused by battery thermal diffusion, ensuring the safety of the system; it has an appropriate operating temperature range, a long service life, good material compatibility, low weight, low viscosity, low corrosion and sustainability, ensuring that it can be put into large-scale production.

[0014] In the immersion battery cooling system, the cooling efficiency is higher than that of the air cooling system. The design of the two-phase immersion liquid cooling system is more difficult, and the two-phase immersion liquid is expensive and has high circulation losses. Therefore, in practical applications, single-phase immersion liquid cooling systems are mainly used.

[0015] Types of battery immersion fluids and research progress:

[0016] Traditional water-cooled battery systems are complex and usually require several devices to operate simultaneously to work properly, and the cost of subsequent repair and maintenance is high. If the battery is directly immersed in water, the system structure will be simpler and easier to produce, but the battery will be in contact with water for a long time, and the risks of corrosion and short circuit will also follow. Therefore, a waterproof dielectric thermal conductive material is needed to protect the battery, inhibit the interaction between the battery and water, and increase the battery life.

[0017] Li Xinxi et al. designed an immersion battery cooling system that uses SS and BN composite materials as waterproof materials to cover the outer surface of the battery. The results show that compared with pure SS, the composite material formed by adding BN can effectively improve thermal conductivity, and the temperature difference of the battery module is kept within 5°C, which can ensure the safe operation of the battery in water for a long time and prevent battery corrosion. However, due to the complexity of actual operation and the safety risk caused by sealing failure after using composite materials, water is generally not used as an immersion liquid.

[0018] M&I Materials has launched the MIVOLT series of ester-based immersion coolants, including the low-viscosity product DF7 and the high-viscosity product DFK, which are specially used for immersion cooling of new energy vehicle batteries. However, the cost of the current full immersion liquid cooling system is relatively high compared with traditional air cooling and liquid cooling. However, this technology has high requirements for the sealing of the battery module, and problems such as leakage and corrosion need to be solved. It is expected to be used first only in some scenarios with higher safety sensitivity.

[0019] Current immersion liquid cooling systems, such as Figure 1 As shown, the system includes an immersion box 1 and a battery core 2. The immersion box 1 contains a liquid coolant 10. A liquid outlet 8 and a liquid inlet 9 are provided on the side wall of the immersion box 1. The battery core is completely immersed in the liquid coolant. The system directly provides a liquid outlet and a liquid inlet on the side wall of the immersion box. The liquid flow is prone to liquid coolant leakage. The overall flow of the liquid makes the battery thermal balance too good, which in turn makes the internal temperature of the battery module too stable, so that the temperature may not be regulated. The liquid coolant is prone to cause battery core corrosion. Utility Model Content

[0020] In order to solve the deficiencies of the above technical solutions, the purpose of the utility model is to provide a new type of immersion energy storage cooling module.

[0021] The purpose of the utility model is achieved through the following technical solutions.

[0022] A novel submerged energy storage cooling module comprises an immersion box, a plurality of battery cores and a water-cooling plate, wherein the plurality of battery cores are arranged in the immersion box along the length direction of the immersion box, the battery cores are inverted in the immersion box, the immersion box is filled with insulating oil, the insulating oil immerses the battery cores and does not contact the top cover of the immersion box, the water-cooling plate is installed on the battery cores and is located below the top cover of the immersion box, a portion of the water-cooling plate is immersed in the insulating oil, two through holes are opened on the top cover of the immersion box, a water inlet and a water outlet of the water-cooling plate are respectively connected to the outside of the immersion box through a through hole, so as to realize the circulation of antifreeze between the water-cooling plate and the outside.

[0023] In the above technical solution, the lower surface of the water cooling plate is connected to the bottom of the battery core, and the water cooling plate is installed at one end of the immersion tank along the length direction.

[0024] In the above technical solution, the water cooling plate is provided with a plurality of parallel U-shaped flow channels.

[0025] In the above technical solution, the water-cooling plate is partially immersed in insulating oil.

[0026] In the above technical solution, the water inlet of the water cooling plate is connected to the water inlet pipe, the water inlet pipe passes through the immersion tank top cover and communicates with the outside, and the water outlet of the water cooling plate is connected to the water outlet pipe, the water outlet pipe passes through the immersion tank top cover and communicates with the outside.

[0027] In the above technical solution, a fixing plate is installed on the water inlet pipe and the water outlet pipe, and the fixing plate is installed on the outer surface of the top cover of the immersion box.

[0028] The advantages and beneficial effects of the utility model are:

[0029] 1. The utility model solves the safety problem of the battery core in a thermal runaway state by inverting the battery core and immersing the pole ear in insulating oil, thereby improving the thermal stress problem of the aluminum row of the battery core under long-term operation and ensuring the temperature uniformity of the battery module.

[0030] 2. The utility model installs a water cooling plate under the top cover of the immersion box, and opens two through holes on the top cover. The water inlet and outlet of the water cooling plate are connected to the outside through a through hole respectively, so that the heat generated by the battery core and the heat of the insulating oil are brought out of the immersion box, solving the risk of leakage of the insulating oil in the immersion cooling module. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an immersion liquid cooling system in the prior art.

[0032] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0033] Figure 3 It is a schematic diagram of the overall structure of the utility model.

[0034] Figure 4 It is a partial structural schematic diagram of the utility model.

[0035] Among them, 1: immersion box, 2: battery core, 3: water cooling plate, 4: insulating oil, 5: water inlet pipe, 6: water outlet pipe, 7: fixing plate, 8: liquid inlet, 9: liquid outlet, 10: liquid coolant. DETAILED DESCRIPTION

[0036] The technical solution of the present utility model is further described below in conjunction with specific embodiments.

[0037] like Figure 2-Figure 4As shown, a novel submerged energy storage cooling module comprises an immersion box 1, a plurality of battery cells 2 and a water cooling plate 3. The plurality of battery cells 2 are sequentially arranged in the immersion box 1 along the length direction of the immersion box 1, and the battery cells 2 are inverted in the immersion box 1 (the battery cell leads of the battery cells 2 are led out from the top cover of the immersion box 1), that is, the positive and negative aluminum bars of the battery cells 2 are located at the bottom of the immersion box 1, and the immersion box 1 is filled with insulating oil 4, and the insulating oil 4 immerses the battery cells 2 and does not contact the top cover of the immersion box 1 to prevent the insulating oil 4 from leaking, thereby ensuring the safety of the battery cells 2 under extreme conditions and solving the thermal stress problem of the aluminum bars of the battery cells 2 under long-term working conditions.

[0038] The water cooling plate is installed on two parallel battery cores and is located below the top cover of the immersion tank 1. Part of the water cooling plate 3 is immersed in the insulating oil 4. Two through holes are opened on the top cover of the immersion tank 1. The water inlet and outlet of the water cooling plate 3 are connected to the outside of the immersion tank 1 through a through hole respectively.

[0039] Specifically, the water cooling plate 3 is installed at one end of the immersion tank 1 along the length direction. The water cooling plate 3 is provided with a plurality of parallel U-shaped flow channels to ensure the temperature uniformity of the battery core 2. The water cooling plate 3 is connected to the outside of the immersion tank 1 through a water inlet and a water outlet to realize the circulation of antifreeze between the water cooling plate and the outside. The antifreeze enters the water cooling plate 3 from the water inlet, circulates in the water cooling plate 3, takes away the heat generated by the battery cell, and is discharged to the outside of the immersion tank 1 through the water outlet, which can not only cool the battery core 2, but also isolate the coolant from the insulating oil 4 through the water cooling plate 3.

[0040] In this embodiment, the number of the battery cells 2 is 24, 12 battery cells 2 form a group and are arranged in sequence inside the immersion box 1, and two groups of battery cells 2 are divided into two rows and placed in the immersion box 1.

[0041] Specifically, the water inlet of the water-cooled plate 3 is connected to the water inlet pipe 5, and the water inlet pipe 5 passes through the top cover of the immersion tank 1 to communicate with the outside. The water outlet of the water-cooled plate 3 is connected to the water outlet pipe 6, and the water outlet pipe 6 passes through the top cover of the immersion tank 1 to communicate with the outside. A fixing plate 7 is installed on the water inlet pipe 5 and the water outlet pipe 6, and the fixing plate 7 is installed on the outer surface of the top cover of the immersion tank 1.

[0042] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0043] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0044] The above is an exemplary description of the present invention. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be done by other technical personnel in this field without expending creative labor falls within the protection scope of the present invention.

Claims

1. A new type of immersion energy storage cooling module, characterized in that: It includes an immersion box, a plurality of battery cells and a water cooling plate. The plurality of battery cells are arranged in the immersion box along the length direction of the immersion box. The battery cells are inverted in the immersion box. The immersion box is filled with insulating oil. The insulating oil immerses the battery cells and does not contact the top cover of the immersion box. The water cooling plate is installed on the battery cells and is located below the top cover of the immersion box. Part of the water cooling plate is immersed in the insulating oil. Two through holes are opened on the top cover of the immersion box. The water inlet and the water outlet of the water cooling plate are connected to the outside of the immersion box through a through hole respectively, so as to realize the circulation of antifreeze between the water cooling plate and the outside.

2. The novel immersion energy storage cooling module according to claim 1 is characterized in that: The lower surface of the water cooling plate is connected to the bottom of the battery core, and the water cooling plate is installed at one end of the immersion tank along the length direction.

3. The novel immersion energy storage cooling module according to claim 1 is characterized in that: The water cooling plate is provided with a plurality of parallel U-shaped flow channels.

4. The novel immersion energy storage cooling module according to claim 1 is characterized in that: The water-cooling plate is partially immersed in insulating oil.

5. The novel immersion energy storage cooling module according to claim 1 is characterized in that: The water inlet of the water cooling plate is connected to a water inlet pipe, and the water inlet pipe passes through the top cover of the immersion box and communicates with the outside. The water outlet of the water cooling plate is connected to a water outlet pipe, and the water outlet pipe passes through the top cover of the immersion box and communicates with the outside.

6. The novel immersion energy storage cooling module according to claim 5 is characterized in that: A fixing plate is installed on the water inlet pipe and the water outlet pipe, and the fixing plate is installed on the outer surface of the top cover of the immersion box.

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