A household submerged battery energy storage device

Abstract

A kind of household immersed battery energy storage device, including outer box, immersed inner box and energy storage battery group;The immersed inner box is located in the inside of outer box, and the energy storage battery group is located in the inside of immersed inner box;Immersed inner box inside is also filled with for the immersion cooling energy storage battery group immersion coolant;The energy storage battery group is made of several battery monomers, and insulation spacer is arranged between adjacent battery monomers and between the energy storage battery group and the immersed inner box around the energy storage battery group, and insulation partition is arranged between the bottom of the energy storage battery group and the immersed inner box.The utility model discloses by setting immersed inner box, can effectively guarantee the safety and uniformity of energy storage battery group;By setting insulation spacer and insulation partition, both ensure that the battery monomers and the energy storage battery group and the outside environment maintain electrical isolation, and can provide space for the flow heat exchange of immersion coolant.

Description

Technical Field

[0001] This utility model relates to the field of battery energy storage technology, and in particular to a household immersion battery energy storage device. Background Technology

[0002] Energy storage battery packs are battery systems composed of multiple individual cells, used to store electrical energy and release it when needed. They convert electrical energy into chemical energy through electrochemical reactions, possess charging and discharging capabilities, and can provide reliable power support for various applications. With the development of energy storage technology, the heat dissipation of battery packs has gradually become a crucial factor affecting battery performance and lifespan. Currently, conventional residential energy storage devices generally employ passive thermal management, sealing the battery pack inside a casing without any forced heat dissipation measures, posing significant thermal safety risks.

[0003] CN 222953172U discloses an immersion liquid-cooled battery box, including a box body, a lithium battery module built into the box body, the box body is sealed and divided into a large compartment and a small compartment, the large compartment contains the lithium battery module immersed in cooling liquid, the large compartment is connected to a liquid injection system, the small compartment contains the lithium battery module and the necessary matching connectors, and a sight glass is provided on the outside of the box body, the upper and lower ends of the sight glass are respectively connected to the large compartment through pipes. Although the patent discloses that a large chamber is placed inside the box as an inner liner to hold lithium battery modules submerged in cooling liquid, it still has the following defects: (1) It simply injects the liquid into the large chamber without setting up a flow space for the liquid (i.e., there is no flow gap between battery cells), which restricts the flow of the liquid inside the battery pack and makes it difficult to distribute it evenly around each battery cell, resulting in poor temperature uniformity and cooling effect; (2) A quick connector and pipeline for liquid injection are set on the side of the large chamber. If the sealing effect at the connection is poor, the liquid can easily leak out, thereby reducing the safety of the battery box. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a safe, highly uniform, and well-cooled household immersion battery energy storage device.

[0005] The technical solution of this utility model is: a household immersion battery energy storage device, including an outer casing, an immersion inner casing, and an energy storage battery pack; the immersion inner casing is located inside the outer casing, and the energy storage battery pack is located inside the immersion inner casing; the immersion inner casing is also filled with an immersion coolant for immersing and cooling the energy storage battery pack; the energy storage battery pack is composed of several battery cells, and insulating strips are provided between adjacent battery cells and between the energy storage battery pack and the immersion inner casing; an insulating partition is provided between the bottom of the energy storage battery pack and the immersion inner casing.

[0006] Furthermore, the adjacent battery cells and the area around the energy storage battery pack and the submerged inner tank are formed by insulating spacers that extend laterally and longitudinally, and each gap constitutes a cooling channel for the micro-flow of the submerged coolant.

[0007] Furthermore, the insulating spacer located between adjacent battery cells is situated in the middle of the battery cell, and its width and height are smaller than the width and height of the battery cell.

[0008] Furthermore, the insulating spacer located between the energy storage battery pack and the immersion inner tank is centrally positioned on the end face of the energy storage battery pack facing the inner wall of the immersion inner tank, and its width and height are smaller than the corresponding dimensions of that end face.

[0009] Furthermore, the top cover of the submerged inner tank integrates the positive and negative terminals of the energy storage battery pack, a pressure relief valve, and a temperature and voltage monitoring interface.

[0010] Furthermore, the energy storage battery pack is completely immersed in the immersion coolant, and the immersion level is at least 20 mm above the explosion-proof valve on the top of the battery.

[0011] Furthermore, the outer casing has heat dissipation holes on its walls for dissipating heat from the energy storage battery pack.

[0012] Furthermore, the size of the insulating partition is not smaller than the bottom surface size of the energy storage battery pack, which is used to form an insulating barrier between the energy storage battery pack and the external environment.

[0013] Furthermore, the immersion coolant is injected through the mounting hole of the pressure relief valve, or injected after opening the upper cover plate.

[0014] Furthermore, the insulating spacer located between the energy storage battery pack and the submerged inner casing is configured to be integrally provided along each end face of the energy storage battery pack, or separately provided on each battery cell corresponding to each end face.

[0015] The beneficial effects of this utility model are: By setting up an immersion inner chamber, the safety and temperature uniformity of the energy storage battery pack can be effectively guaranteed; By setting up insulating strips and insulating partitions, electrical isolation is ensured between individual battery cells and between the energy storage battery pack and the external environment. At the same time, space is provided for the flow and heat exchange of the immersed coolant. The design of the insulating strips is not only very simple in structure, but also allows the immersed coolant to flow between each battery cell, which greatly improves the cooling efficiency of the energy storage battery pack. It also eliminates the need for an additional coolant plate at the bottom of the box for auxiliary cooling, as is required in existing technologies. (3) By integrating the corresponding electrical connectors into the top cover of the immersion tank and running the wiring from the top of the immersion tank, no other joints or pipes need to be installed on the sides of the immersion tank, which can effectively ensure that the immersion tank does not leak liquid and greatly improve the reliability and safety of household energy storage equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the outer casing structure of an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure after opening the outer casing of this utility model embodiment; Figure 3 This is a schematic diagram of the internal structure of the immersion inner box according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the arrangement structure of the insulating spacers in an embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of the energy storage battery pack with an insulating partition at the bottom according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached diagram: 1. Outer casing; 2. Immersed inner casing; 3. Energy storage battery pack; 4. Insulating strip; 5. Insulating partition; 11. Heat dissipation holes; 21. Top cover plate; 22. Positive and negative terminal connectors; 23. Pressure relief valve; 24. Temperature and voltage monitoring interface; 25. Mounting plate; 26. Sealing gasket; 31. Battery cell. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figures 1-5 As shown: A household immersion battery energy storage device includes an outer casing 1, an immersion inner casing 2, and an energy storage battery pack 3; the immersion inner casing 2 is located inside the outer casing 1, and the energy storage battery pack 3 is located inside the immersion inner casing 2; the immersion inner casing 2 is also filled with immersion coolant for immersing and cooling the energy storage battery pack 3; the energy storage battery pack 3 is composed of a number of battery cells 31, and insulating strips 4 are provided between adjacent battery cells 31 and between the energy storage battery pack 3 and the immersion inner casing 2; an insulating partition 5 is provided between the bottom of the energy storage battery pack 3 and the immersion inner casing 2.

[0020] Specifically, such as Figure 1 As shown: The outer casing 1 is used to protect the submerged inner casing 2, the energy storage battery pack 3, and related electrical connectors to improve the reliability of the residential energy storage device. The outer casing 1 has multiple heat dissipation holes 11 to dissipate heat from the energy storage battery pack 3. For example, the outer casing 1 has multiple heat dissipation holes 11 symmetrically arranged on both opposite casing walls, and the heat dissipation holes 11 are preferably designed as elongated holes.

[0021] like Figure 2 As shown: In this embodiment, the immersion inner casing 2 is fixed inside the outer casing 1. By placing the energy storage battery pack 3 inside the immersion inner casing 2 compared to placing it directly inside the outer casing, this invention can effectively ensure the safety and temperature uniformity of the energy storage battery pack 3. The immersion inner casing 2 can be fixed by screws or clips, etc., and its specific fixing structure is not limited here. The immersion inner casing 2 is preferably designed with a square structure to facilitate the installation of the energy storage battery pack 3.

[0022] The top surface of the immersion inner tank 2 is connected to a top cover plate 21, which is fixed to the top edge of the immersion inner tank 2 by a number of screws. To improve the sealing performance, a sealing gasket 26 is provided between the top cover plate 21 and the top edge of the immersion inner tank 2, and screws pass through the sealing gasket 26 to be fixed to the edge of the immersion inner tank 2.

[0023] The upper cover plate 21 of the submerged inner tank 2 integrates the positive and negative terminals 22 of the energy storage battery pack, the pressure relief valve 23, and the temperature and voltage monitoring interface 24. The positive and negative terminals 22 are used for charging and discharging the energy storage battery pack 3; the pressure relief valve 23 is used to release pressure when the pressure inside the submerged inner tank 2 exceeds its threshold value; and the temperature and voltage monitoring interface 24 is used to connect temperature or pressure monitoring equipment for monitoring or testing. In this embodiment, the positive and negative terminals 22, the pressure relief valve 23, and the temperature and voltage monitoring interface 24 can be directly mounted on the upper cover plate 21, or an opening can be provided on the upper cover plate 21, with a mounting plate 25 sealed at the opening. The positive and negative terminals 22 and the temperature and voltage monitoring interface 24 are mounted on the mounting plate 25, and the pressure relief valve 23 is mounted on the upper cover plate 21. When it is necessary to fill the immersion coolant into the immersion inner tank, it can be filled through the mounting hole of the pressure relief valve 23, or after opening the top cover 21, or after opening the mounting plate 25 on the top cover. This embodiment, by sealing the top cover 21 and mounting plate 25 of the immersion inner tank, and by placing each electrical connector on the top cover of the immersion inner tank 2, prevents the immersion coolant from leaking out of the immersion inner tank, thereby improving the reliability and safety of the residential energy storage device.

[0024] In this embodiment, the energy storage battery pack 3 can be, but is not limited to, a lithium-ion battery pack or a sodium-ion battery pack. The energy storage battery pack 3 is completely immersed in the immersion coolant, and each battery cell is equipped with an explosion-proof valve on its top. The immersion liquid level is at least 20 mm above the explosion-proof valve on the top of the battery.

[0025] like Figure 3 and Figure 4As shown: In this embodiment, the energy storage battery pack 3 is composed of several battery cells 31 arranged in an array to form one or more rows. Insulating strips 4 are provided between adjacent battery cells 31 and between the energy storage battery pack 3 and the immersion inner tank 2. The insulating strips 4 form gaps extending laterally and longitudinally, and each gap constitutes a cooling channel for the micro-flow of the immersion coolant. Specifically, the insulating strips 4 located between adjacent battery cells 31 are located in the middle of the battery cells 31, and the width and height of the insulating strips 4 are smaller than the width and height of the battery cells 31. For example, each battery cell 31 has an insulating strip 4 fixed in the middle of the other four sides except for the top and bottom surfaces. The thickness and size of the insulating strips 4 are set so that gaps are formed between adjacent battery cells 31 and between the energy storage battery pack 3 and the immersion inner tank 2, providing space for the flow and heat exchange of the immersion coolant. Preferably, the length of the insulating spacer 4 is equal to or slightly less than the length of the battery cell 31, and the width / height of the insulating spacer 4 is not greater than 1 / 2 of the width / height of the battery cell, and more preferably 1 / 6 to 1 / 4 of the width / height of the battery cell, so as to ensure sufficient gaps to allow the immersed coolant to form a micro-flow cooling channel, which greatly improves the cooling efficiency of the energy storage battery pack.

[0026] Preferably, all insulating spacers 4 are of the same size and are centrally located to ensure uniform flow and distribution of the immersion coolant, effectively removing heat evenly from each battery cell 31, thereby improving the temperature uniformity of the entire energy storage battery pack 3. More preferably, the insulating spacers 4 are bonded together between adjacent battery cells and between the energy storage battery pack and the immersion inner casing.

[0027] It is understood that in this embodiment, the insulating spacer 4 located between the energy storage battery pack 3 and the immersion inner box 2 can also be integrally structured and continuously provided along the end face of the energy storage battery pack toward the inner wall of the immersion inner box. That is, only one insulating spacer is provided on this end face, extending from the battery cell at the initial position to the battery cell at the end, rather than providing an insulating spacer on each battery cell corresponding to this end face separately.

[0028] It can be said that the present invention does not limit the specific arrangement of the insulating spacers, as long as it can ensure electrical isolation between battery cells and between the energy storage battery pack and the external environment, and provide space for the flow and heat exchange of the immersed coolant.

[0029] like Figure 5As shown: In this embodiment, an insulating partition 5 is provided between the bottom of the energy storage battery pack 3 and the submerged inner casing 2 to achieve insulation isolation between the energy storage battery pack 3 and the external environment. Preferably, in this embodiment, an integral insulating partition 5 is provided on the entire bottom surface of the energy storage battery pack 3, and the size of the insulating partition 5 is equal to the size of the entire bottom surface of the energy storage battery pack. It can be understood that in this embodiment, an insulating partition 5 may also be provided on the bottom surface of each battery cell 31, and the size of the insulating partition 5 may be equal to the bottom surface size of the battery cell 31; or an insulating partition 5 may be provided on the bottom surface of each row of batteries in the energy storage battery pack 3, and the insulating partition 5 may be equal to the bottom surface size of each row of batteries.

[0030] In this embodiment, by setting the insulating strip 4 and the insulating partition 5, it not only ensures electrical isolation between battery cells and between the energy storage battery pack and the external environment, but also provides cooling space for the flow and heat exchange of the immersed coolant, thus greatly improving the cooling efficiency.

[0031] It is understood that this embodiment can be used not only for heat dissipation of lithium-ion battery packs, but also for heat dissipation of sodium-ion battery packs and other electronic components.

[0032] In summary, this embodiment, on the one hand, by setting up an immersion inner casing, not only can it ensure that each battery cell can operate within a safe temperature range, preventing overheating, overcooling, or temperature unevenness, but its dual protection with the outer casing can also improve the safety of the equipment; therefore, the immersion inner casing can effectively guarantee the thermal safety and temperature uniformity of the energy storage battery pack. On the other hand, by setting up insulating strips and insulating partitions, it ensures electrical isolation between battery cells and between the energy storage battery pack and the external environment, while also providing space for the flow and heat exchange of the immersion coolant, and the design of the insulating strips improves the cooling efficiency of the energy storage battery pack.

[0033] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A household immersion battery energy storage device, characterized in that, It includes an outer casing, an inner immersion casing, and an energy storage battery pack; the inner immersion casing is located inside the outer casing, and the energy storage battery pack is located inside the inner immersion casing; the inner immersion casing is also filled with an immersion coolant for immersing and cooling the energy storage battery pack; the energy storage battery pack is composed of several battery cells, and insulating strips are provided between adjacent battery cells and between the energy storage battery pack and the inner immersion casing; an insulating partition is provided between the bottom of the energy storage battery pack and the inner immersion casing.

2. The household immersion battery energy storage device according to claim 1, characterized in that, The adjacent battery cells and the area around the energy storage battery pack and the submerged inner tank are formed by insulating strips that create horizontal and vertical gaps. Each gap constitutes a cooling channel for the micro-flow of the submerged coolant.

3. The household immersion battery energy storage device according to claim 2, characterized in that, The insulating spacer located between adjacent battery cells is situated in the middle of the battery cell, and its width and height are smaller than the width and height of the battery cell.

4. The household immersion battery energy storage device according to claim 2, characterized in that, The insulating spacer located between the energy storage battery pack and the immersion inner tank is centrally positioned on the end face of the energy storage battery pack facing the inner wall of the immersion inner tank, and its width and height are smaller than the corresponding dimensions of that end face.

5. The residential immersion battery energy storage device according to any one of claims 1 to 4, characterized in that, The top cover of the submerged inner tank integrates the positive and negative terminals of the energy storage battery pack, a pressure relief valve, and temperature and voltage monitoring interfaces.

6. The residential immersion battery energy storage device according to any one of claims 1 to 4, characterized in that, The energy storage battery pack is completely immersed in the immersion coolant, and the immersion level is at least 20mm above the explosion-proof valve on the top of the battery.

7. The residential immersion battery energy storage device according to any one of claims 1 to 4, characterized in that, The outer casing has heat dissipation holes on its walls to dissipate heat from the energy storage battery pack.

8. The residential immersion battery energy storage device according to any one of claims 1 to 4, characterized in that, The size of the insulating partition is not less than the bottom surface size of the energy storage battery pack, and it is used to form an insulating barrier between the energy storage battery pack and the external environment.

9. The residential immersion battery energy storage device according to claim 5, characterized in that, The immersion coolant is injected through the mounting hole of the pressure relief valve, or injected after opening the upper cover.

10. The residential immersion battery energy storage device according to claim 4, characterized in that, The insulating spacer located between the energy storage battery pack and the submerged inner tank is configured to be integrally provided along each end face of the energy storage battery pack, or separately provided on each battery cell corresponding to each end face.

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