Arrangement structure of immersed cooling energy storage battery pack

Abstract

According to the arrangement structure of the immersed cooling energy storage battery packs, the upper side surfaces and the lower side surfaces of the multiple immersed energy storage battery packs are arranged in a stacked mode, a cooling liquid inlet and outlet of a cooling pipeline is adjacent to an electrical assembly, an electrical connecting cavity is formed in the outer side of one end of a bottom cavity dividing plate, and an immersion cavity is formed in the inner side of the other end of the bottom cavity dividing plate; a battery cell, a cooling pipeline and immersion liquid are arranged in the immersion cavity, a leading-out cavity is arranged on the outer side of the upper portion of one end of the immersion cavity in a protruding mode, the lower portion of the leading-out cavity is adjacent to an electrical connection cavity through a bottom cavity dividing plate, and electrical assemblies such as a cooling liquid inlet and outlet, a battery pack positive electrode and a battery pack negative electrode and an anti-explosion valve are led out from the top of a battery pack. When two battery packs are stacked, all wire harnesses in the battery packs are led out of the wire outlets, the immersion liquid in the immersion cavity completely submerges the battery cells, the electrical connection cavity is used for assembling electrical parts of the battery packs, and the electrical connection cavity can also be used for leaving enough space for wires coming out of electrical components of the battery packs below when the two battery packs are stacked.

Description

Technical Field

[0001] This article belongs to the technical field of immersion energy storage battery packs, and specifically relates to an arrangement structure of an immersion cooling energy storage battery pack. Background Art

[0002] Immersed energy storage technology, especially immersed liquid-cooled energy storage technology, has shown strong development momentum in recent years and has become an important innovation direction in the field of energy storage. With the deepening of global dependence on renewable energy and the acceleration of energy transformation, the demand for energy storage technology has increased dramatically. As a key technology to improve the performance and safety of energy storage systems, immersed liquid-cooled energy storage is expected to be more widely used. Future research and development will focus on reducing costs, optimizing coolant formulations, improving system integration, and exploring more application scenarios.

[0003] Immersion liquid cooling energy storage technology is in a rapid development stage. Its high efficiency, safety and reliability make it a highlight of the energy storage industry. However, the technical level also faces huge challenges. At present, immersion liquid cooling technology has some difficulties and pain points, such as the problem of immersion liquid leakage.

[0004] Immersion fluid leakage is an important safety issue faced by immersion cooling systems. Its consequences may include but are not limited to the following:

[0005] Environmental pollution: Many immersion cooling systems use special coolants, such as fluorinated liquids or electrical insulation liquids. Once these liquids leak, if they are not properly handled, they may pollute the surrounding environment, especially have long-term effects on soil and water resources. For coolants containing harmful chemical components, they may also pose a threat to the ecological balance.

[0006] Equipment damage: Leaked liquid may contact electronic equipment or other sensitive components, which may cause short circuits, corrosion or degradation of insulation performance. In severe cases, it may cause equipment failure or even the collapse of the entire system. For energy storage systems, liquid leakage may also affect battery performance and shorten its life.

[0007] Safety hazards: Some coolants are flammable, and leakage increases the risk of fire, especially in high-energy-density environments such as energy storage facilities. Once a fire occurs, it may spread rapidly and be difficult to control. In addition, for battery energy storage systems, liquid leakage may also cause thermal runaway, leading to thermal runaway or explosion of the battery.

[0008] Operational interruption: Leakage accidents will cause the system to be shut down immediately for inspection and maintenance, resulting in service interruption or reduced production capacity. For energy storage power stations, it will affect the stability and reliability of power supply.

[0009] Economic costs: Cleaning up leaked liquid, repairing damaged equipment, replacing coolant, and economic losses caused by downtime all bring high financial burdens. In addition, compensation costs for environmental damage and legal fines may also need to be borne.

[0010] Impact on the public and brand image: Severe leakage accidents may arouse public doubts about the safety of enterprises and technologies, damage the corporate image, and affect customer trust and the evaluation of social responsibility.

[0011] Therefore, dealing with immersion liquid leakage is a very crucial part of the design of immersion cooling systems. To address the pain points of immersion liquid leakage, on the basis of meeting the specification design of the battery pack, improvements have been made in the structural design of the battery pack, which can not only meet the design requirements but also ensure that the liquid does not leak. The usual design is that after the battery cells are formed into modules, all the wires are led out from the front end of the battery pack, and the top and bottom of the entire battery pack are flat. The purpose is to maximize the compression space when the battery packs are stacked into clusters and the clusters are stacked into containers. However, the overall installation and assembly volume of the battery pack will be greatly increased due to the additional connected pipelines and electrical equipment at both ends of the battery pack. Summary of the Utility Model

[0012] To solve the above problems, this paper proposes an arrangement structure for an immersion-cooled energy storage battery pack. The upper and lower surfaces of several immersion energy storage battery packs are arranged in a stacked manner. The immersion energy storage battery pack includes an immersion housing, battery cells, a cooling pipeline, and electrical components. The battery cells are arranged inside the immersion housing, and the cooling pipeline is arranged outside the battery cells in a wrapped manner. The coolant inlet and outlet of the cooling pipeline are arranged adjacent to the electrical components. The immersion housing includes side plates, a bottom partition plate, and a top cover plate. The bottom partition plate is a plate that is bent and divided at both ends. An electrical connection cavity is arranged outside one end of the bottom partition plate, and an immersion cavity is arranged inside the other end of the bottom partition plate. Side plates are arranged on both sides of the bottom partition plate in a sealed manner. The top cover plate is arranged on the upper surface of the bottom partition plate and the upper surface of the side plates in a flush manner. The immersion cavity is internally provided with battery cells, a cooling pipeline, and immersion liquid. An extraction cavity protrudes outward above one end of the immersion cavity. The extraction cavity is communicated with the immersion cavity. The lower part of the extraction cavity is adjacent to the electrical connection cavity through the bottom partition plate. Inside the extraction cavity, a coolant inlet and outlet and electrical components protrude vertically upward. The coolant inlet and outlet and the electrical components are all arranged inside the electrical connection cavity of the adjacent immersion energy storage battery pack above. The bottom surface and side surface of the electrical connection cavity are conductively connected to the outside of the immersion energy storage battery pack. Electrical components such as the coolant inlet and outlet, the positive and negative electrodes of the battery pack, and the explosion-proof valve are all led out from the top of the battery pack. All the wire harnesses inside the battery pack are led out from the wire outlet. The battery cells inside the immersion cavity are completely submerged by the immersion liquid. The electrical connection cavity is used to assemble the electrical components of the battery pack, such as the BMU, the balancing device, etc. The electrical connection cavity can also be used to leave enough space for the wires coming out of the electrical components of the lower battery pack when two battery packs are stacked.

[0013] The outer contour of the bottom partition plate is in the shape of a rectangular plate. The immersion cavity and the extraction cavity are longitudinally and integrally bent on the bottom partition plate. The extraction cavity and the immersion cavity are communicated with each other. The bottom surface of the extraction cavity is horizontally parallel to the bottom surface of the immersion cavity. The side plate is in the shape of a rectangular bent plate. Outer-turned assembly flanges are arranged on both the upper and lower sides of the side plate. The length of the side plate is greater than the outer contour length of the bottom partition plate, and the width of the side plate is greater than the vertical height of the bottom partition plate. By uniformly leading out all the outlets of the energy storage battery pack from the top of the battery pack, and with the immersion liquid in the immersion cavity, there is no shaking situation in the usage scenario of the energy storage battery pack. Therefore, the leakage of the immersion liquid can be avoided.

[0014] The top cover is in the shape of a rectangular bent plate, with inward-retracted assembly folds on both sides of the top cover. The length of the top cover is the same as the length of the side plate, the inner width of the top cover is the same as the outer spacing between the symmetrical side plates on both sides, and an electrical component is longitudinally arranged on the surface of one end of the top cover, and a coolant inlet and outlet are arranged through the electrical components. The electrical component is sealed and connected to the inner surface of the top cover, and the length of the electrical component is smaller than the spacing between the side plates on both sides. This structural method reduces the requirements for the waterproof structure of the top opening, and with the same waterproof technical design, this structure is more reliable.

[0015] The electrical components include positive and negative electrodes of the battery pack, an explosion-proof valve and an outlet. The positive and negative electrodes, explosion-proof valve and outlet of the battery pack are all arranged flush with each other on the surface of the top cover plate. The positive and negative electrodes and outlet of the battery pack are connected to each other through cables with the battery cells. The explosion-proof valve is connected to the inside of the lead-out cavity and the immersion cavity. The electrical connection cavity is directly connected to the outside of the immersed energy storage battery pack. The bottom inner side of the electrical connection cavity is protruding with an electrical component. This structure does not affect the upper and lower stacking of the battery pack, and there is no need to increase the distance between the two battery packs for the components extending from the top, which is beneficial to the space utilization of the energy storage container and saves costs. In addition to the battery cells, the largest cost of the immersion system solution is the immersion fluid. This solution can minimize the volume of the immersion fluid and save costs.

[0016] Beneficial effects:

[0017] Electrical components such as the coolant inlet and outlet, battery pack positive and negative poles, and explosion-proof valves are all led out from the top of the battery pack. All wiring harnesses inside the battery pack are led out from the outlet. The battery cells are completely submerged in the immersion liquid inside the immersion chamber. The electrical connection chamber is used to assemble electrical components of the battery pack, such as BMU, balancing device, etc. The electrical connection chamber can also be used to leave enough space for the wires coming out of the electrical components of the battery pack below when two battery packs are stacked.

[0018] By unifying all the outlets of the energy storage battery pack from the top of the battery pack, the immersion liquid is in the immersion chamber, and there is no shaking in the use scenario of the energy storage battery pack. Therefore, the leakage of the immersion liquid will be avoided.

[0019] The form of arranging electrical components on the top cover plate reduces the requirements for the waterproof structure of the top opening. With the same waterproof technical design, this structure is more reliable.

[0020] The structure of the electrical connection cavity does not affect the stacking of the battery packs. There is no need to increase the distance between the two battery packs for the components extending from the top, which is conducive to the space utilization of the energy storage container and saves costs. The largest cost of the immersion system solution is the immersion fluid, in addition to the battery cells. This solution can minimize the volume of the immersion fluid and save costs. Brief Description of the Drawings

[0021] Figure 1 is a schematic view of the outside of the layout structure of an immersion-cooled energy storage battery pack;

[0022] Figure 2 is a schematic cross-sectional structure view of the layout structure of an immersion-cooled energy storage battery pack;

[0023] Figure 3 is a schematic view of the inner assembly of the layout structure of an immersion-cooled energy storage battery pack;

[0024] In the figure: 1, immersion cavity; 2, electrical connection cavity; 3, side plate; 4, bottom sub-chamber plate; 5, top cover plate; 6, positive and negative electrodes of the battery pack; 7, explosion-proof valve; 8, wire outlet; 9, coolant inlet and outlet; 10, battery cell; 11, lead-out cavity. Detailed Embodiment

[0025] To deepen the understanding of the present utility model, the present utility model will be further described in detail below in conjunction with embodiments and the drawings. The embodiments are only used to explain the present utility model and do not constitute a limitation on the protection scope of the present utility model.

[0026] Immersion cavity 1, electrical connection cavity 2, side plate 3, bottom sub-chamber plate 4, top cover plate 5, positive and negative electrodes of the battery pack 6, explosion-proof valve 7, wire outlet 8, coolant inlet and outlet 9, battery cell 10, lead-out cavity 11.

[0027] As Figure 1 、 2 、shown in Figure 3;

[0028] An arrangement structure of an immersion-cooled energy storage battery pack, the upper and lower surfaces of a number of immersion energy storage battery packs are arranged in a stacked manner. The immersion energy storage battery pack includes an immersion housing, a battery cell 10, a cooling pipeline, and an electrical component. The battery cell 10 is arranged inside the immersion housing, and the cooling pipeline is arranged outside the battery cell 10 in a wrapped manner. The coolant inlet and outlet 9 of the cooling pipeline are arranged adjacent to the electrical component. The immersion housing includes a side plate 3, a bottom partition plate 4, and a top cover plate 5. The bottom partition plate 4 is a plate with both ends partitioned and bent. An electrical connection cavity 2 is arranged outside one end of the bottom partition plate 4, and an immersion cavity 1 is arranged inside the other end of the bottom partition plate 4. Side plates 3 are arranged on both sides of the bottom partition plate 4 in a sealed manner. The top cover plate 5 is arranged on the upper surface of the bottom partition plate 4 and the upper surface of the side plate 3 in a flush manner. The battery cell 10, the cooling pipeline, and the immersion liquid are arranged inside the immersion cavity 1. An extraction cavity 11 protrudes outside above one end of the immersion cavity 1. The extraction cavity 11 is communicated with the immersion cavity 1. The lower part of the extraction cavity 11 is adjacent to the electrical connection cavity 2 through the bottom partition plate 4. The coolant inlet and outlet 9 and the electrical component protrude vertically upward inside the extraction cavity 11. The coolant inlet and outlet 9 and the electrical component are both arranged inside the electrical connection cavity 2 of the adjacent immersion energy storage battery pack above. The bottom surface and the side surface of the electrical connection cavity 2 are communicated with the outside of the immersion energy storage battery pack. The outer contour of the bottom partition plate 4 is in the shape of a rectangular plate. The immersion cavity 1 and the extraction cavity 11 are arranged on the bottom partition plate 4 in a longitudinally integrally bent manner. The extraction cavity 11 and the immersion cavity 1 are communicated with each other. The bottom surface of the extraction cavity 11 is horizontally parallel to the bottom surface of the immersion cavity 1. The side plate 3 is in the shape of a rectangular bent plate. Outer-turned assembly flanges are arranged on both the upper and lower sides of the side plate 3. The length of the side plate 3 is greater than the outer contour length of the bottom partition plate 4. The width of the side plate 3 is greater than the vertical height of the bottom partition plate 4. The top cover plate 5 is in the shape of a rectangular bent plate. Inner-received assembly flanges are arranged on both the front and rear sides of the top cover plate 5. The length of the top cover plate 5 is the same as the length of the side plate 3. The inner width of the top cover plate 5 is the same as the outer distance between the two symmetric side plates 3. An electrical component is arranged longitudinally on one end surface of the top cover plate 5. The coolant inlet and outlet 9 penetrate through between the electrical components. The electrical component is connected to the inner surface of the top cover plate 5 in a sealed manner. The length of the electrical component is less than the distance between the two side plates 3 on both sides. The electrical component includes the positive and negative battery terminals 6, an explosion-proof valve 7, and an outlet 8. The positive and negative battery terminals 6, the explosion-proof valve 7, and the outlet 8 are all arranged on the surface of the top cover plate 5 in a flush manner. The positive and negative battery terminals 6 and the outlet 8 are both conductively connected to the battery cell 10 through cables. The explosion-proof valve 7 is communicated with the inside of the extraction cavity 11 and the immersion cavity 1. The electrical connection cavity 2 is directly communicated with the outside of the immersion energy storage battery pack. Electrical components protrude inside the bottom of the electrical connection cavity 2.

[0029] Implementation example;

[0030] Electrical components such as the coolant inlet and outlet 9, the positive and negative electrodes 6 of the battery pack, and the explosion-proof valve 7 are all led out from the top of the battery pack. All the wire harnesses inside the battery pack are led out from the wire outlet 8. The battery cells 10 are completely submerged in the immersion liquid inside the immersion cavity. The electrical connection cavity 2 is used to assemble the electrical components of the battery pack, such as the BMU, the equalization device, etc. The electrical connection cavity 2 can also be used to leave enough space for the wires coming out of the electrical components of the lower battery pack when two battery packs are stacked.

[0031] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An arrangement structure of an immersion-cooled energy storage battery pack, wherein the upper and lower surfaces of a plurality of immersion energy storage battery packs are arranged in a stacked manner. The immersion energy storage battery pack includes an immersion housing, an electric core, a cooling pipeline, and an electrical component. The electric core is arranged inside the immersion housing, the cooling pipeline is arranged outside the electric core in a wrapped manner, and the coolant inlet and outlet of the cooling pipeline are arranged adjacent to the electrical component. It is characterized in that, The described immersion housing includes side plates, a bottom partition plate, and a top cover plate. The bottom partition plate is a two-end separated and bent plate. An electrical connection cavity is provided on the outer side of one end of the bottom partition plate, and an immersion cavity is provided on the inner side of the other end of the bottom partition plate. Side plates are provided on both sides of the bottom partition plate in a sealed manner, and a top cover plate is provided on the upper surface of the bottom partition plate and the upper surface of the side plates in a flush manner. Inside the immersion cavity, there are battery cells, cooling pipelines, and immersion liquid. Above one end of the immersion cavity, an extraction cavity protrudes outward. The extraction cavity is in communication with the immersion cavity. Below the extraction cavity, it is adjacent to the electrical connection cavity through the bottom partition plate. Inside the extraction cavity, a coolant inlet / outlet and electrical components protrude vertically upward. The coolant inlet / outlet and electrical components are both arranged inside the electrical connection cavity of the adjacent immersion energy storage battery pack above. The bottom surface and side surface of the electrical connection cavity are in conduction with the outer side of the immersion energy storage battery pack.

2. The layout structure of an immersion-cooled energy storage battery pack according to claim 1, characterized in that, The outer contour of the bottom partition plate is in the shape of a rectangular plate. The bottom partition plate is integrally bent longitudinally to form an immersion cavity and an extraction cavity. The extraction cavity and the immersion cavity are in communication with each other, and the bottom surface of the extraction cavity is horizontally parallel to the bottom surface of the immersion cavity.

3. The layout structure of an immersion-cooled energy storage battery pack according to claim 1, characterized in that, The side plate is in the shape of a rectangular bent plate. Outer folding assembly flanges are provided on both the upper and lower sides of the side plate. The length of the side plate is greater than the outer contour length of the bottom partition plate, and the width of the side plate is greater than the vertical height of the bottom partition plate.

4. The layout structure of an immersion-cooled energy storage battery pack according to claim 1, characterized in that The top cover plate is in the shape of a rectangular bent plate. Inner retracting assembly flanges are provided on both the front and rear sides of the top cover plate. The length of the top cover plate is the same as the length of the side plate. The inner width of the top cover plate is the same as the outer spacing between the symmetric side plates on both sides. On the surface of one end of the top cover plate, electrical components are provided longitudinally. The coolant inlet / outlet passes through between the electrical components. The electrical components are connected to the inner surface of the top cover plate in a sealed manner. The length of the electrical components is less than the spacing between the side plates on both sides.

5. The arrangement structure of an immersion-cooled energy storage battery pack according to claim 4, characterized in that, The electrical components include the positive and negative electrodes of the battery pack, an explosion-proof valve, and an outlet. The positive and negative electrodes of the battery pack, the explosion-proof valve, and the outlet are all provided on the surface of the top cover plate in a flush manner. The positive and negative electrodes of the battery pack and the outlet are all conductively connected to the battery cells through cables. The explosion-proof valve is in communication with the inside of the extraction cavity and the immersion cavity.

6. The layout structure of an immersion-cooled energy storage battery pack according to claim 1, wherein, The electrical connection cavity is directly in conduction with the outer side of the immersion energy storage battery pack. Electrical components protrude inside the bottom of the electrical connection cavity.

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