Immersed battery liquid cooling box

Abstract

The utility model discloses an immersed battery liquid cooling box, which belongs to the technical field of battery cooling and comprises a battery pack box body, and at least one layer of battery pack is placed in the battery pack box body. The battery pack comprises a plurality of hollow flow guide plates attached to the batteries, each hollow flow guide plate comprises two hollow-out plates arranged in parallel, and a connecting plate is connected between the two hollow-out plates; a liquid inlet pipe is arranged at the top of the battery pack box body, a funnel type confluence structure is arranged at the bottom of the battery pack box body, and a liquid outlet of the funnel type confluence structure is connected with a liquid outlet pipe. According to the utility model, the liquid is uniformly distributed and shunted through the drainage plate and the hollow flow guide plate, and the cooling liquid can enter the hollow flow guide plate at the gap position of the battery and is in contact with the binding surface of the battery through the through hole of the hollow plate, so that the cooling liquid can be more thoroughly in contact with the battery, and the heat dissipation effect of the cooling liquid on the battery is improved; liquid at the bottom can be well gathered to the liquid outlet through the funnel type confluence structure, it is ensured that the liquid can be discharged more quickly and comprehensively, the liquidity of cooling liquid formed in the structural aspect is good, and flowing does not need to be promoted through external force.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of battery cooling, in particular to an immersion type battery liquid cooling box. Background Art

[0002] In recent years, vigorously developing new energy vehicles has become an important measure for countries to deal with environmental pollution and energy shortages. As the heart of electric vehicles, the safety and life of power battery packs have become important factors restricting the development of the electric vehicle industry. Most electric vehicle spontaneous combustion incidents often originate from battery problems. This is because the battery generates a lot of heat during operation, especially when charging and discharging at high rates. If the heat is not discharged in time, it will cause thermal runaway of the battery, leading to violent combustion or even explosion.

[0003] Among the existing battery thermal management solutions, immersion liquid cooling is one of the most promising solutions. The battery pack is immersed in an electrically insulating liquid such as a fluorinated liquid, and the heat generated by the battery is absorbed by boiling heat exchange. The vapor generated by the phase change condenses and drips on the cooling device, and at the same time transfers the heat to the condensate circulating in the cooling device, thereby dissipating the heat in the battery pack. However, the existing immersion battery liquid cooling box has the following problems:

[0004] The batteries are densely distributed in the battery box, and the batteries cannot be completely in contact with the coolant, so the heat dissipation effect of the coolant on the batteries still needs to be improved;

[0005] The coolant in the battery box has poor fluidity due to its structure and needs external force to promote flow, resulting in higher operating costs. Utility Model Content

[0006] The technical solution of the utility model is aimed at the technical problem that the existing technical solution is too single, and provides a solution that is significantly different from the existing technology. It mainly provides an immersion battery liquid cooling box to solve the technical problems raised in the above background technology that the battery cannot be completely in contact with the coolant and the coolant has poor fluidity in the structure.

[0007] The technical solution adopted by the utility model to solve the above technical problems is:

[0008] An immersion battery liquid cooling box comprises a battery pack box body, wherein at least one layer of battery packs is placed inside the battery pack box; the battery pack comprises a plurality of hollow guide plates fitted with the batteries, the hollow guide plates comprise two hollow plates arranged in parallel, and a connecting plate is connected between the two hollow plates at equal intervals; a liquid inlet pipe is provided at the top of the battery pack box body, a funnel-type confluence structure is provided at the bottom of the battery pack box body, and a liquid outlet pipe is connected to the liquid outlet of the funnel-type confluence structure.

[0009] Furthermore, the hollow guide plate is made of aluminum.

[0010] Furthermore, a support beam is provided at the bottom of each battery pack, and the support beam is used to carry the battery and the hollow guide plate.

[0011] Furthermore, the battery pack also includes a front fixed end plate connected to the front end of the support beam and a rear fixed end plate connected to the rear end of the support beam.

[0012] Furthermore, a battery pack frame for placing the battery pack is provided in the battery pack box, a horizontally arranged drainage plate is provided on the top of the battery pack frame, leakage holes are evenly opened on the drainage plate, and the drainage plate is lower than the liquid inlet pipe.

[0013] Furthermore, an opening is arranged at the top of the battery pack box, and a sealing cover is arranged at the opening, and a sealing strip is arranged on the sealing cover.

[0014] Furthermore, a pressure relief valve is installed on the sealing cover.

[0015] Furthermore, a liquid level gauge is provided on the front side of the battery pack box.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model is provided with a hollow guide plate fitted with the battery. On the one hand, the hollow guide plate made of aluminum has high thermal conductivity and can promote the heat dissipation of the battery. On the other hand, the coolant enters the hollow guide plate at the gap between the batteries, and the hollow guide plate evenly distributes the liquid, and the coolant fully contacts the fitted end face of the battery through the through holes on the hollow plate, so that the coolant can contact the battery more thoroughly and take away the heat from the surface of the battery, thereby improving the heat dissipation effect of the coolant on the battery.

[0018] The utility model is provided with a liquid inlet pipe at the top of the box body, and a funnel-type confluence structure is provided at the bottom of the battery pack box body, and a liquid outlet pipe is connected to the liquid outlet of the funnel-type confluence structure. Due to the effect of gravity, the pressure of the liquid is the highest at the liquid outlet, so that the liquid can basically flow out smoothly, and through the design of the bottom funnel-type confluence structure, due to gravity, the pressure of the coolant from the upper plane of the funnel-type confluence structure to the liquid outlet gradually increases, and the liquid at the bottom can be well gathered to the liquid outlet, the liquid is discharged thoroughly, the liquid discharge pressure is greater, and the liquid discharge is smoother, ensuring that the liquid can be discharged faster and more comprehensively. The coolant has better fluidity in terms of structure, and does not need to rely on external force to promote flow, thereby reducing operating costs.

[0019] In the utility model, the coolant flows in from the top of the box body and is discharged from the funnel-type confluence structure at the bottom, thereby realizing the circulation of the coolant. It can be seen from the test data that each battery is heated evenly and the temperature difference of the battery pack is controlled within 1°C, that is, the heat dissipation performance of the battery is more uniform.

[0020] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0022] Figure 2 This is a schematic diagram of the pressure relief valve and its installation position in the utility model;

[0023] Figure 3 It is a schematic diagram of the box frame and its internal structure in the utility model;

[0024] Figure 4 for Figure 3 A schematic diagram of the structure of the middle region A;

[0025] Figure 5 It is a three-dimensional structural schematic diagram of the hollow guide plate and the supporting beam frame of the battery pack in the utility model;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of a single hollow guide plate in the utility model;

[0027] Figure 7 for Figure 6 A schematic diagram of the structure of the middle region B;

[0028] Figure 8 It is a structural schematic diagram of a battery pack frame and a sealing cover filled with battery packs in the utility model;

[0029] FIG9 is a schematic diagram of a conventional battery box immersion system;

[0030] Fig.10 The temperature test result diagrams of the battery pack box bottom adopting a flat bottom structure and a funnel-type confluence structure, wherein Figure (a) is the battery temperature test result diagram of the battery pack box bottom adopting a flat bottom structure, and Figure (b) is the battery temperature test result diagram of the battery pack box bottom adopting a funnel-type confluence structure;

[0031] Fig.11 Figure 1 is a graph showing the flow trajectory and speed change test results of the immersion liquid when the bottom of the battery pack case adopts a flat bottom structure and a funnel-type confluence structure. Figure (a) is a graph showing the flow trajectory and speed change test results of the immersion liquid when the bottom of the battery pack case adopts a flat bottom structure. Figure (b) is a graph showing the flow trajectory and speed change test results of the immersion liquid when the bottom of the battery pack case adopts a funnel-type confluence structure.

[0032] Reference numerals:

[0033] 1. Battery pack box; 11. Box outer panel; 12. Box frame; 13. Sealing cover; 131. Sealing strip; 14. Liquid inlet pipe; 15. Funnel-type confluence structure; 16. Liquid outlet pipe; 2. Box electrical cabinet; 3. Battery pack; 31. Battery; 32. Front fixed end plate; 33. Rear fixed end plate; 34. Hollow guide plate; 341. Hollow plate; 342. Connecting plate; 35. Support beam; 4. Liquid level gauge; 5. Pressure relief valve; 6. Battery pack frame; 61. Drainage plate. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0035] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field of the present invention. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. Example 1

[0037] Please refer to the attached Figure 1 -Attached Figure 3 , an immersion battery liquid cooling box, comprising a battery box 1 and a box electrical cabinet 2 located on one side of the battery box 1, the battery box 1 comprising a box outer panel 11 and a box frame 12, the box outer panel 11 is wrapped around the box frame 12 to play a supporting role, and the box electrical cabinet 2 is equipped with external pipelines and control devices. The top of the battery box 1 is provided with an opening for taking in and placing the battery frame 6, and a sealing cover 13 is provided at the opening. Please refer to the attached Figure 8 The sealing cover 13 is provided with a sealing strip 131. Closing the sealing cover 13 can ensure the sealing of the entire box. Compared with the inverted design and the side-opening design, the top design has a reliable sealing structure, the sealing surface is not subject to the pressure of the immersion liquid, and is more durable. Please refer to the attached Figure 1 , Attachment Figure 3 and attached Figure 4 A liquid inlet pipe 14 located above the drainage plate 61 is provided at the upper end of the battery pack box 1, and a funnel-type confluence structure 15 is provided at the bottom of the battery pack box 1, and a liquid outlet pipe 16 is connected to the liquid outlet of the funnel-type confluence structure 15, and the liquid outlet pipe 16 is connected to the liquid inlet pipe 14 through a reflux pipe system (not shown in the figure), and the reflux pipe system is located in the box electrical cabinet 2.

[0038] Please refer to the attached Figure 3 and attached Figure 8 A battery pack frame 6 for carrying batteries is placed in the battery pack box 1, and eight layers of cavities are arranged on the battery pack frame 6 (at least one layer of cavities is arranged), and a set of battery packs 3 is placed in each layer of cavities. A horizontally arranged drain plate 61 is arranged on the top of the battery pack frame 6, and leakage holes are evenly opened on the drain plate 61. There is a gap between the drain plate 61 and the top of the battery pack box 1, and the drain plate 61 is lower than the liquid inlet pipe 14. The drain plate 61 evenly distributes the liquid entering from the liquid inlet pipe 14 into the box.

[0039] Please refer to the attached Figure 3 and attached Figure 8 The battery pack 3 includes uniformly arranged batteries 31, a front fixed end plate 32 at the front end, a rear fixed end plate 33 at the rear end, and hollow guide plates 34 vertically located at the front and rear sides of each battery 31. Please refer to the attached Figure 5 -Attached Figure 7 The hollow guide plate 34 includes two hollow plates 341 arranged in parallel, and a connecting plate 342 perpendicular to the hollow plates 341 is evenly spaced between the two hollow plates 341. The hollow guide plate 34 is made of aluminum. A support beam 35 is provided at the bottom of the battery pack 3 for carrying the battery 31 and the hollow guide plate 34. A battery 31 is placed between each two adjacent hollow guide plates 34. The front fixed end plate 32 is connected to the front end of the support beam 35, and the rear fixed end plate 33 is connected to the rear end of the support beam 35. The material thickness of the hollow guide plate 34 is 0.5 mm.

[0040] When in use, the coolant enters the battery pack case 1 from the liquid inlet pipe 14, with an initial temperature of 298K, a flow rate of 40L / min, and a pressure difference of 20KPa. After being evenly distributed by the guide plate 61, the coolant flows evenly downward from each area into the battery pack 3; on the one hand, the hollow aluminum guide plate 34 has a high thermal conductivity, which can promote the heat dissipation of the battery; on the other hand, the coolant enters the hollow guide plate 34, which evenly distributes the liquid, and the coolant is fully in contact with the fitting end face of the battery 31 through the through holes on the hollow plate 341, so that the coolant can more thoroughly contact the battery 31 and take away the heat from the surface of the battery 31;

[0041] After passing through the battery pack 3 layer by layer, the coolant falls into the funnel-type confluence structure 15 and is discharged through the liquid outlet pipe 16. After being cooled by the reflux pipe system, it re-enters the battery pack box 1 through the liquid inlet pipe 14, realizing the circulation of the coolant, and each battery is evenly heated. The temperature difference of each battery is about 1°C, and the temperature difference of the entire battery pack is controlled within 1°C. Due to the effect of gravity, the pressure of the liquid is the highest at the liquid outlet, so that the liquid can basically flow out smoothly. In addition, through the design of the bottom funnel-type confluence structure 15, due to gravity, the pressure of the coolant from the upper plane of the funnel-type confluence structure 15 to the liquid outlet gradually increases, and the liquid at the bottom can be well gathered to the liquid outlet. Compared with the flat-bottom confluence structure, the liquid discharge is more thorough, the liquid discharge pressure is also greater, and the liquid discharge is smoother, which can ensure that the liquid can be discharged faster and more comprehensively through the liquid outlet pipe 16. The coolant has a better fluidity in the structure, and does not need to rely on external force to promote flow, thereby reducing operating costs. Example 2

[0042] The difference between this embodiment and embodiment 1 is that:

[0043] The holes on the hollow plate 341 are regular hexagonal holes.

[0044] A liquid level gauge 4 is provided at the upper front end of the battery pack box 1. The liquid level gauge 4 can be used to clearly see whether the liquid level of the immersion liquid in the box is within the design required height, thereby adjusting the flow rate of the immersion liquid.

[0045] The rest is the same as in Example 1. Example 3

[0046] The difference between this embodiment and embodiment 2 is that:

[0047] The sealing cover 13 is provided with a pressure relief valve 5, which can prevent the air pressure in the box from being too high, thereby affecting the flow rate of the immersion liquid and avoiding increasing the pressure on the inner wall.

[0048] The space between the guide plate 61 and the sealing surface of the sealing cover 13 is equipped with a fire protection system to enhance the protection effect of the battery pack.

[0049] The rest is the same as in Example 2.

[0050] Comparative Example 1

[0051] The structure of a conventional battery box immersion system is shown in FIG9 , which has at least three vertical liquid inlet pipes and at least three vertical liquid return pipes, which are evenly distributed on both sides of the battery to reduce the flow difference between the left and right sides of the battery. The liquid inlet and liquid return ports are provided with flow regulating controllers.

[0052] Compared with the traditional battery box immersion system, the utility model is provided with a liquid inlet pipe 14 at the top and a liquid outlet pipe 16 at the bottom. The hollow guide plate 34 evenly distributes the incoming liquid into the box body. Due to the effect of gravity, the liquid pressure is the highest at the liquid outlet, so that the liquid flows out smoothly and flows in the box body to take away the heat. The advantage of the utility model is that there is no difference in flow rate, and the circulating immersion liquid continuously takes away the heat.

[0053] Comparative Example 2

[0054] The bottom of the battery pack box 1 adopts a flat bottom structure.

[0055] Through comparative tests, we can see that in terms of temperature, Fig.10 As shown, the bottom of the battery box 1 adopts a flat bottom structure, and the temperature difference between the batteries is about 2°C; while the present invention adopts a funnel-type confluence structure 15, and the temperature difference between the batteries is about 1°C. Fig.11 It can be seen that the bottom of the battery pack box 1 adopts a flat bottom structure, the immersion liquid flows from top to bottom, and the flow speed is about 7.58e+00 m / s; while the funnel-type confluence structure 15 is adopted in the utility model, the immersion liquid flows from top to bottom, and the flow speed is about 8.23e+00 m / s.

[0056] From the above content, it can be seen that the battery box adopts the funnel-type confluence structure 15, which can reduce the temperature difference between batteries and speed up the flow rate of the immersion liquid.

[0057] The above description of the utility model in combination with the accompanying drawings is an exemplary description. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as the non-substantial improvements are made by adopting the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An immersion battery liquid cooling box, comprising a battery pack box (1), wherein at least one layer of battery packs (3) is placed in the battery pack box (1); characterized in that: The battery pack (3) comprises a plurality of hollow guide plates (34) fitted with the batteries (31), the hollow guide plates (34) comprising two hollow plates (341) arranged in parallel, and a connecting plate (342) being connected between the two hollow plates (341) at equal intervals; a liquid inlet pipe (14) is provided at the top of the battery pack box (1), a funnel-type confluence structure (15) is provided at the bottom of the battery pack box (1), and a liquid outlet pipe (16) is connected to the liquid outlet of the funnel-type confluence structure (15).

2. The immersion battery liquid cooling box according to claim 1, characterized in that: The hollow guide plate (34) is made of aluminum.

3. The immersion type battery liquid cooling box according to claim 1, characterized in that: A support beam (35) is provided at the bottom of each battery pack (3), and the support beam (35) is used to carry the battery (31) and the hollow guide plate (34).

4. The immersion type battery liquid cooling box according to claim 1, characterized in that: The battery pack (3) further comprises a front fixed end plate (32) connected to the front end of the support beam frame (35) and a rear fixed end plate (33) connected to the rear end of the support beam frame (35).

5. The submerged battery liquid cooling box according to claim 1, characterized in that: A battery pack frame (6) for placing the battery pack (3) is provided in the battery pack box (1), a horizontally arranged drainage plate (61) is provided on the top of the battery pack frame (6), leakage holes are evenly formed on the drainage plate (61), and the drainage plate (61) is lower than the liquid inlet pipe (14).

6. The immersion type battery liquid cooling box according to claim 1, characterized in that: The top of the battery pack box (1) is provided with an opening, and a sealing cover (13) is provided at the opening, and a sealing strip (131) is provided on the sealing cover (13).

7. The immersion type battery liquid cooling box according to claim 6, characterized in that: A pressure relief valve (5) is installed on the sealing cover (13).

8. The submerged battery liquid cooling box according to claim 1, characterized in that: A liquid level meter (4) is provided on the front of the battery pack box (1).

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