A lithium-ion battery system for outdoor energy storage

Abstract

The present invention discloses a lithium-ion battery system for outdoor energy storage, which relates to the field of lithium-ion batteries and includes a shell, wherein the inner cavity of the shell is provided with a lithium-ion battery pack, wherein the lithium-ion battery pack is composed of a plurality of lithium-ion batteries connected in parallel, and a water tank is provided on the inner wall of the shell. The inner cavity of the water tank is provided with a water pump, and a water inlet pipe is installed on the water pump, one end of the water inlet pipe is connected to a first heat sink, and the other end of the water inlet pipe extends into the inner cavity of the water tank, and a second heat sink is provided below the first heat sink. The present invention can dissipate heat for lithium-ion battery packs used outdoors, increase the heat exchange time, and fully exchange heat between the lithium-ion battery pack and the air, while cooling the bottom of the lithium-ion battery pack. This improves the shortcomings of traditional lithium-ion battery packs in that the bottom is in contact with the shell and the heat dissipation is slow, thereby enhancing the cooling effect and effectively protecting the lithium-ion battery pack.

Description

Technical Field

[0001] The present invention relates to the field of lithium-ion batteries, and in particular to a lithium-ion battery system for outdoor energy storage. Background Art

[0002] A lithium-ion battery (LIB) is a rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and back during charging. Compared to the metallic lithium used in non-rechargeable lithium batteries, lithium-ion batteries use intercalated lithium compounds as electrode materials. This battery has a high energy density.

[0003] Existing lithium-ion battery packs used in energy storage cabinets are prone to heat accumulation during operation. In the high temperature environment of summer, the high temperature outdoor environment and the heat generated by the operation of the lithium-ion battery pack cause the surface of the lithium-ion battery pack to be in a high temperature state. High-temperature operation will accelerate the increase of the battery's internal resistance and accelerate the aging of the battery. At the same time, the lithium-ion battery pack is also prone to high-temperature failures, affecting its normal power supply use. Summary of the Invention

[0004] In response to the above problems, the present application provides a lithium-ion battery system for outdoor energy storage.

[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a lithium-ion battery system for outdoor energy storage, comprising a shell, an inner cavity of which is provided with a lithium battery pack, the lithium battery pack being composed of a plurality of lithium batteries connected in parallel, and a water tank being provided on the inner wall of the shell.

[0006] The inner cavity of the water tank is provided with a water pump, and a water inlet pipe is installed on the water pump. One end of the water inlet pipe is connected to a first heat sink, and the other end of the water inlet pipe extends into the inner cavity of the water tank. A second heat sink is provided below the first heat sink. When the water pump drives the coolant inside the water tank to flow, the coolant passes through the first heat sink and the second heat sink in sequence.

[0007] A further improvement of the technical solution of the present invention is that the first heat dissipation element includes a diverter pipe connected to the end of the water inlet pipe, guide pipes are fixed to the openings at both ends of the diverter pipe, and a side pipe is fixed to the bottom end of the guide pipe.

[0008] The guide tube is L-shaped, and the side tube is serpentine-shaped. In a natural state, the side tube is located on the side of the lithium battery pack, and the coolant is located on the inner side of the side tube and flows in a serpentine shape until it flows under the lithium battery pack.

[0009] A further improvement of the technical solution of the present invention is that the second heat sink includes a bottom tube fixed to the end of the side tube, a return tube is fixed to the other end of the bottom tube, and a cooling cavity is provided on the return tube.

[0010] The bottom tube is in a serpentine coil shape. When the coolant passes through the first heat sink and the second heat sink in sequence, the coolant flows into the return pipe and the cooling cavity until the coolant enters the interior of the water tank again.

[0011] A further improvement of the technical solution of the present invention is that the cooling cavity includes a tapered portion, a plurality of heat dissipation rings are fixed to the outer surface of the tapered portion, and the outer surfaces of the heat dissipation rings are sheet-shaped protrusions.

[0012] A further improvement of the technical solution of the present invention is that a positioning beam is fixed at the lower part of the inner cavity of the shell, and a plurality of positioning columns are fixed at the top of the positioning beam.

[0013] The outer surface of the positioning column is clamped with an internal bar, and a plurality of heat sinks are fixed to the side of the internal bar. When the internal bar is installed on the positioning column, the internal bar and the heat sink are located below the lithium battery pack, and the heat sink is located on the inner side of a pair of bottom tubes.

[0014] A further improvement of the technical solution of the present invention is that a carrying plate is clamped on the top of the positioning column, and in a natural state, the carrying plate is attached to the bottom of the lithium battery pack.

[0015] A further improvement of the technical solution of the present invention is that a ventilation window is provided on the outer side of the shell.

[0016] A further improvement of the technical solution of the present invention is that a cover is detachably connected to the upper portion of the shell.

[0017] In summary, the technical effects and advantages of the present invention are as follows:

[0018] The present invention can dissipate heat from lithium battery packs used outdoors, increasing the heat exchange time and enabling sufficient heat exchange between the lithium battery and the air. It can also simultaneously cool the bottom of the lithium battery pack, addressing the shortcomings of conventional lithium battery packs, where the bottom and the housing are in close contact, resulting in slow heat dissipation. This improves the cooling effect and effectively protects the lithium battery pack. Furthermore, it can effectively reduce the long coolant circulation time in extremely high-temperature outdoor environments, which can reduce heat dissipation efficiency and ensure heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 This is a structural diagram of the lithium battery pack of the present invention when it is installed inside the shell and cover.

[0022] Figure 3 This is a schematic diagram of the position structure of the first heat dissipation component of the lithium battery combination of the present invention.

[0023] Figure 4 This is a schematic diagram of the position structure of the water tank and the second heat dissipation component of the present invention.

[0024] Figure 5 This is a schematic diagram of the position structure of the first heat dissipation component and the second heat dissipation component of the present invention.

[0025] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle.

[0026] Figure 7 This is a structural diagram of the positioning beam, positioning column, internal strip, heat sink and bearing plate of the present invention.

[0027] In the figure: 1. Shell; 2. Lithium battery pack; 3. Water tank; 4. Water inlet pipe; 5. Diverter pipe; 6. Guide pipe; 7. Side pipe; 8. Bottom pipe; 9. Return pipe; 10. Cooling cavity; 1001. Conical part; 1002. Heat dissipation ring; 11. Positioning beam; 12. Positioning column; 13. Internal strip; 14. Heat sink; 15. Loading plate; 16. Ventilation window; 17. Cover. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1: Reference Figure 1-2 The illustrated lithium-ion battery system for outdoor energy storage includes a housing 1, within which is disposed a lithium battery pack 2 composed of multiple lithium cells connected in parallel. A water tank 3 is disposed on the inner wall of the housing 1. Coolant is stored in the water tank 3, which is a conventional metal water tank.

[0030] The inner cavity of water tank 3 is equipped with a water pump, which is mounted on a water inlet pipe 4. One end of the water inlet pipe 4 is connected to a first heat sink, and the other end of the water inlet pipe 4 extends into the inner cavity of water tank 3. A second heat sink is disposed below the first heat sink. When the water pump drives the coolant inside water tank 3 to flow, the coolant passes through the first heat sink and then the second heat sink in sequence. Inside housing 1, the first and second heat sinks are both located outside lithium battery pack 2. When the coolant flows through the first and second heat sinks, heat exchange occurs outside lithium battery pack 2, reducing the operating temperature of lithium battery pack 2.

[0031] like Figure 3 、 Figure 4 As shown, the first heat dissipation element includes a diverter pipe 5 connected to the end of the water inlet pipe 4 , a guide pipe 6 is fixed to the openings at both ends of the diverter pipe 5 , and a side pipe 7 is fixed to the bottom end of the guide pipe 6 .

[0032] The guide tube 6 is L-shaped, and the side tube 7 is serpentine. In its natural state, the side tube 7 is located to the side of the lithium battery pack 2, and the coolant flows in a serpentine pattern inside the side tube 7 until it flows under the lithium battery pack 2. The serpentine shape of the side tube 7 is intended to increase the circulation time of the water, further increasing the time for heat exchange during the coolant circulation, allowing for sufficient heat exchange between the lithium battery pack 2 and the air, further improving the cooling effect.

[0033] like Figure 3 、 Figure 4 As shown, the second heat sink includes a bottom tube 8 fixed to the end of the side tube 7, a return tube 9 is fixed to the other end of the bottom tube 8, and a cooling cavity 10 is provided on the return tube 9.

[0034] The bottom pipe 8 is in a serpentine coil shape. When the coolant passes through the first heat sink and the second heat sink in sequence, the coolant flows into the return pipe 9 and the cooling cavity 10 until the coolant enters the water tank 3 again.

[0035] After passing through the first heat dissipation component, the coolant can enter the second heat dissipation component under the action of gravity. The bottom tube 8 inside the second heat dissipation component is located below the lithium battery pack 2. When the coolant flows inside the bottom tube 8, the bottom of the lithium battery pack 2 can be cooled. In view of the shortcomings of the traditional lithium battery pack 2, the bottom shell is closely fitted and the heat dissipation is slow, an improvement is made. The bottom tube 8 is also distributed in a serpentine coil shape, which improves the cooling effect.

[0036] like Figure 6As shown, the cooling cavity 10 includes a conical portion 1001, and a plurality of heat dissipation rings 1002 are fixed to the outer surface of the conical portion 1001. The outer surface of the heat dissipation ring 1002 is a sheet-like protrusion. When air passes through the cooling cavity 10, the conical portion 1001 on the surface of the cooling cavity 10 can accelerate the speed of the wind and can come into contact with the air more comprehensively. At the same time, the heat dissipation ring 1002 can perform heat exchange between the coolant inside the cooling cavity 10 and the external air, thereby increasing the speed of heat exchange. The heat dissipation ring 1002 is made of copper and has good heat dissipation performance. The coolant inside the cooling cavity 10 is cooled, the cooling of the water is accelerated, and the cooling effect on the water is improved.

[0037] The coolant passes through the return pipe 9 and is cooled in the cooling cavity 10, and can then enter the water tank 3 again. Furthermore, under the action of the water pump, the coolant can flow into the first heat dissipation component and the second heat dissipation component again to achieve the recycling of the coolant and make full use of resources.

[0038] Example 2: Figure 5 、 Figure 7 As shown, in order to avoid the situation in which the temperature of the coolant increases after flowing through the first heat sink and the second heat sink in a high-temperature outdoor environment, resulting in a decrease in the subsequent heat dissipation efficiency of the lower part of the lithium battery pack 2, the following method is adopted:

[0039] A positioning beam 11 is fixed to the lower portion of the inner cavity of the housing 1, and a plurality of positioning posts 12 are fixed to the top of the positioning beam 11. An internal bar 13 is secured to the outer surface of the positioning posts 12, and a plurality of heat sinks 14 are fixed to the side surfaces of the internal bar 13. When the internal bar 13 is attached to the positioning posts 12, the internal bar 13 and heat sinks 14 are positioned below the lithium battery pack 2, with the heat sinks 14 positioned inside the pair of bottom tubes 8.

[0040] The heat sink 14 is located below the lithium battery pack 2, which can accelerate the heat dissipation rate below the lithium battery pack 2. At the same time, it can further accelerate the heat exchange rate of the bottom tube 8. When the coolant flows through the first heat sink and the second heat sink, the heat exchange efficiency of the coolant when flowing inside the bottom tube 8 can be guaranteed.

[0041] like Figure 7 As shown, a carrier plate 15 is secured above the positioning post 12. In its natural state, the carrier plate 15 rests against the bottom of the lithium battery pack 2. To remove the heat sink 14, the lithium battery pack 2 can be removed, and the carrier plate 15 can be lifted upward until it is free of the positioning post 12. The internal bar 13 and heat sink 14 can then be removed simultaneously.

[0042] After taking out the heat sink 14, the heat sink 14 can be cleaned to reduce the adhesion of dust to the heat sink 14, and multiple groups of internal strips 13 and heat sinks 14 can be cleaned to ensure the long-term use of the heat sink 14.

[0043] like Figure 2 As shown, a ventilation window 16 is provided on the outside of the housing 1. Multiple through-holes are provided in the ventilation window 16, allowing air to flow smoothly into the interior of the housing 1, ensuring smooth heat dissipation. Furthermore, a water retaining eave is provided on the outside of the through-holes to prevent rainwater from entering the interior of the housing 1 through the through-holes, effectively preventing the lithium battery pack 2 from short-circuiting due to contact with rainwater.

[0044] like Figure 2 As shown, a cover 17 is detachably connected to the upper portion of the housing 1. When the lithium battery pack 2 is used outdoors, the combination of the cover 17 and the housing 1 protects the lithium battery pack 2, enabling the lithium battery pack to operate normally even in humid and rainy weather, effectively preventing external impurities from coming into contact with the lithium battery pack 2, and ensuring the safety performance of the lithium battery pack 2 during charging and discharging.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lithium-ion battery system for outdoor energy storage, characterized by: It comprises a housing (1), wherein the inner cavity of the housing (1) is provided with a lithium battery pack (2), wherein the lithium battery pack (2) is composed of a plurality of lithium batteries connected in parallel, and a water storage tank (3) is provided on the inner wall of the housing (1); The inner cavity of the water storage tank (3) is provided with a water pump, and a water inlet pipe (4) is installed on the water pump. One end of the water inlet pipe (4) is connected to a first heat sink, and the other end of the water inlet pipe (4) extends into the inner cavity of the water storage tank (3). A second heat sink is provided below the first heat sink. When the water pump drives the coolant inside the water storage tank (3) to flow, the coolant passes through the first heat sink and the second heat sink in sequence. The first heat dissipation element comprises a diverter pipe (5) connected to the end of the water inlet pipe (4), a guide pipe (6) is fixed at both end openings of the diverter pipe (5), and a side pipe (7) is fixed at the bottom end of the guide pipe (6); The guide tube (6) is arranged in an L-shape, and the side tube (7) is in a serpentine coil shape. In a natural state, the side tube (7) is located on the side of the lithium battery pack (2), and the coolant is located on the inner side of the side tube (7) and flows in a serpentine shape until it flows into the bottom of the lithium battery pack (2); The second heat dissipation element comprises a bottom tube (8) fixed to the end of the side tube (7), a return tube (9) is fixed to the other end of the bottom tube (8), and a cooling cavity (10) is provided on the return tube (9); The bottom pipe (8) is in the shape of a serpentine coil. When the coolant passes through the first heat sink and the second heat sink in sequence, the coolant flows into the return pipe (9) and the cooling cavity (10) until the coolant enters the interior of the water storage tank (3) again. The cooling cavity (10) comprises a conical portion (1001), a plurality of heat dissipation rings (1002) are fixed to the outer surface of the conical portion (1001), and the outer surfaces of the heat dissipation rings (1002) are flaky protrusions.

2. The outdoor energy storage lithium-ion battery system according to claim 1, characterized in that: A positioning beam (11) is fixed at the bottom of the inner cavity of the housing (1), and a plurality of positioning columns (12) are fixed at the top of the positioning beam (11); An inner bar (13) is clamped on the outer surface of the positioning column (12), and a plurality of heat sinks (14) are fixed to the side of the inner bar (13). When the inner bar (13) is installed on the positioning column (12), the inner bar (13) and the heat sinks (14) are located below the lithium battery pack (2), and the heat sinks (14) are located on the inner side of a pair of bottom tubes (8).

3. The outdoor energy storage lithium-ion battery system according to claim 2, characterized in that: A carrier plate (15) is clamped above the positioning column (12). In a natural state, the carrier plate (15) fits the bottom of the lithium battery pack (2).

4. The outdoor energy storage lithium-ion battery system according to claim 1, characterized in that: A ventilation window (16) is provided on the outer side of the housing (1).

5. The outdoor energy storage lithium-ion battery system according to claim 1, characterized in that: A cover (17) is detachably connected to the upper portion of the housing (1).

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