Safe submerged battery pack

Abstract

The application discloses a safe submerged battery pack, which comprises a battery box shell and a battery cell module pack, the battery cell module is soaked in immersion liquid, cooling liquid is stored in the battery box shell, the immersion liquid is injected into the battery box shell from a liquid injection port, and the cooling liquid enters from a liquid inlet of a liquid cooling plate. By adopting the application, the temperature of the battery cell can be directly reduced, and the difference in the operation temperature of the battery cell is reduced. In addition, the battery cell of the battery module in the application is soaked in the immersion liquid, and the immersion liquid can dissipate heat and replace fire extinguishing.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and more particularly to a safe immersion battery pack. Background Technology

[0002] The battery thermal management technologies in energy storage systems mainly include air cooling or cold plate liquid cooling.

[0003] Air cooling utilizes natural wind pressure or an air conditioning system to dissipate heat from the battery, but its cooling efficiency is low, heat dissipation is uneven, and there are large temperature differences between battery packs. Liquid cooling with a cold plate involves placing a cooling plate filled with circulating coolant below the battery cells to cool the contact areas. The coolant does not directly contact the cells, making it an indirect cooling method. However, this method suffers from slow cooling speed, long cooling time, and a large temperature difference between the bottom and top of the battery cells. Utility Model Content

[0004] This application provides a safe immersion battery pack that improves heat dissipation and also has fire-fighting capabilities.

[0005] The embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a safe immersion battery pack, wherein the battery pack includes a battery casing and a cell module pack, the cell modules are immersed in an immersion liquid, a coolant is stored inside the battery casing, the immersion liquid is injected into the battery casing through an injection port, and the coolant enters from the inlet of a liquid cooling plate.

[0007] In some embodiments, it further includes: an installation and maintenance window disposed on the cover of the battery pack.

[0008] In some embodiments, the lid is made of aluminum sheet by stamping.

[0009] In some embodiments, the immersion liquid is above the upper surface of the battery cells in the battery pack, and is introduced into the battery casing from the injection port for static heat dissipation. The coolant is used for circulating heat dissipation, and the immersion liquid is used for static heat dissipation.

[0010] In some embodiments, a sealing ring is also included, which is disposed at the mounting hole location.

[0011] In some embodiments, a module fixing square tube and a fuse mounting bracket are welded to the liquid cooling plate, and a control board mounting bracket is welded to the inner side of the front box wall.

[0012] In some embodiments, the module fixing tube is connected to the battery cells of the battery pack.

[0013] In some embodiments, the fuse mounting bracket is connected to the fuse, and the slave control board mounting bracket is connected to the slave control board.

[0014] In some embodiments, the system further includes a main positive connector, a main negative connector, and a communication connector for connecting the main positive module, the main negative module, and the communication module, respectively.

[0015] In some embodiments, the system further includes a housing, wherein the welded portions of the housing walls are all fully welded structures.

[0016] The above-mentioned technical solutions adopted in the embodiments of this application can achieve the following beneficial effects: a battery case and a cell module pack, wherein the cell module is immersed in an immersion liquid, the coolant is stored inside the battery case, the immersion liquid is injected into the battery case from the injection port, and the coolant enters from the inlet of the liquid cooling plate. The cell temperature is directly reduced and the temperature difference between the cells is reduced through direct contact between the immersion liquid and the cells in the battery pack.

[0017] The aforementioned safe submersible battery pack provides fire protection from the cell source, controlling heat spread and reducing the risk of thermal runaway, thus replacing traditional fire protection systems.

[0018] The aforementioned safe submersible battery pack employs two cooling methods: indirect cooling and contact cooling. One method involves liquid cooling via a cooling plate within the battery pack, where the coolant flows within the cooling plate, and the lower surface of the battery cells contacts the cooling plate for indirect cooling. The other method involves direct contact between the battery cells and the immersion liquid.

[0019] The aforementioned safe submersible battery pack uses a immersion liquid that also functions as a fire extinguisher, replacing traditional fire extinguishers. The immersion liquid directly contacts the battery cells to cool them down, and its high specific heat capacity and high flash point control the spread of heat within the cells, making them less prone to catching fire. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a partial exploded view of the safe submersible battery pack in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the interior of the housing of a safe submersible battery pack as described in this application embodiment;

[0023] Figure 3 This is a schematic diagram of the housing structure of a safe submersible battery pack in an embodiment of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0026] This application provides a safe immersion battery pack, such as... Figure 1 The diagram shows a partial exploded view of a safe immersion battery pack according to an embodiment of this application. The battery pack includes a battery casing and a cell module pack. The cell modules are immersed in an immersion liquid, and the coolant is stored inside the battery casing. The immersion liquid is injected into the battery casing through an injection port, and the coolant enters through the inlet of a liquid cooling plate.

[0027] like Figure 1 and Figure 3 As shown, it specifically includes: liquid inlet 1 of the liquid cooling plate, liquid outlet 2 of the liquid cooling plate, immersion liquid injection port 3, communication connector 4, main negative connector 5, main positive connector 6, box cover 7, maintenance window 8, explosion-proof device 9, fuse mounting bracket 10, slave control board mounting bracket 11, and module fixing square tube 12.

[0028] The battery pack is housed within a casing, and the battery cells within it are immersed in coolant. The battery pack utilizes a liquid cooling system with cooling plates, where the coolant flows through the plates, indirectly cooling the lower surfaces of the cells. This method of completely immersing the battery pack in coolant enhances safety, replaces the use of perfluorohexanone and heptafluoropropane for heat suppression, reduces the risk of thermal runaway from the cells, and limits the extent of heat spread.

[0029] The battery heat dissipation method in this embodiment is a composite approach. It combines traditional cold plate heat dissipation with complete immersion of the internal components in a liquid solution. This overcomes the shortcomings of cold plate heat dissipation, such as slow cooling speed, long cooling time, insufficient ability to directly reduce cell temperature, and inadequate ability to reduce temperature differences among cells. It not only enhances the uniformity of cell operating temperature but also possesses stronger fire-fighting capabilities than traditional perfluorohexanone and heptafluoropropane, effectively controlling thermal runaway at the cell level. This significantly reduces the risk of thermal runaway and substantially enhances the safety performance and lifespan of the battery pack and energy storage power station.

[0030] In one embodiment of this application, it further includes: an installation and maintenance window 8, which is disposed on the cover of the battery pack.

[0031] By adding the maintenance window 8 to the battery pack cover, maintenance can be performed by opening the maintenance window of the cover 7, unplugging the connector plug on the control board, removing the screws securing the control board, and removing the control board from the outside of the battery pack for replacement. After replacement, the control board can be reinstalled. This method eliminates the need to open the cover or remove the immersion fluid, resulting in fewer operational steps, easier maintenance, reduced workload for maintenance personnel, and better preservation of the battery pack's airtightness.

[0032] In one embodiment of this application, the box cover 7 is made of aluminum sheet by stamping.

[0033] like Figure 2 As shown, the box cover 7 is made by welding the box walls around a liquid-cooled plate. All welded parts of the box walls are fully welded. A modular fixing square tube 12 and a fuse mounting bracket 10 are welded onto the liquid-cooled plate. A control board mounting bracket 11 is welded to the inner side of the front box wall. The box cover 7 is formed by stamping aluminum sheet, achieving both lightweight design and required strength. A maintenance window mounting hole is opened at the front of the box cover, and a ring of rivet nuts is riveted around it. During installation, after installing a sealing ring on the box flange, the box cover 7 is installed; a sealing ring is installed at the maintenance point of the box cover, and then the maintenance window 8 is installed, completing the assembly of the box structure.

[0034] In one embodiment of this application, the coolant is above the upper surface of the battery cells in the battery pack and is introduced into the liquid cooling plate through the injection port for circulating heat exchange.

[0035] Before operation, a measured amount of liquid is injected through the inlet on the front side wall of the tank, ensuring that the immersion liquid is approximately 30mm above the top surface of the battery cell. During operation, the water chiller is activated, and the coolant flows into the liquid cooling plate through the inlet 1 and out through the outlet 2, circulating and exchanging heat through the water chiller. This method completely immerses the battery cell in the immersion liquid. Based on the high flash point and high specific heat capacity of the immersion liquid, it can effectively control the risk of thermal runaway of the battery cell from the source, improve the safety performance of the battery pack, and greatly reduce the risk of thermal runaway fire of the battery cell.

[0036] In addition, the complete immersion of the battery cells in the immersion solution has a good effect on reducing the temperature difference of the cells. The temperature difference between the upper and lower surfaces of a single cell can be controlled within 3°C, and the temperature difference of the entire battery pack is within 4°C. This ensures that the battery operates within the optimal temperature range, effectively extends the battery's lifespan, and improves the overall safety performance of the energy storage power station.

[0037] In one embodiment of this application, a sealing ring is also included, which is disposed at the mounting hole location.

[0038] The enclosure is fully welded, with few openings on the walls and all mounting holes using sealing rings to reduce the risk of leakage.

[0039] In one embodiment of this application, a module fixing square tube 12 and a fuse mounting bracket 10 are welded on the liquid cooling plate, and a slave control board mounting bracket 11 is welded on the inner side of the front box wall.

[0040] The components of the submersible battery pack include cell modules, fuses, and slave control boards. The cell modules are placed on the module fixing square tube 12 of the enclosure and fastened to the module fixing square tube 12 with screws. Then, the fuses are installed on the fuse mounting bracket 10 and the slave control boards are fixed on their mounting brackets.

[0041] In one embodiment of this application, the module fixing point 12 is connected to the battery cells of the battery pack.

[0042] The battery cells in the battery pack are connected and fixed to the battery cells in the battery pack, ensuring the stability of the battery cells in the battery pack.

[0043] In one embodiment of this application, the fuse mounting bracket 10 is connected to the fuse, and the slave control board mounting bracket is connected to the slave control board.

[0044] The fuse mounting bracket 10 is connected to the fuse, and at the same time ensures that the slave control board mounting bracket is connected to the slave control board.

[0045] As is understandable, fuses are a standard component of battery packs and will not be described in detail here.

[0046] In one embodiment of this application, a main positive connector 6, a main negative connector 7, and a communication connector 4 are further included to connect the main positive module, the main negative module, and the communication module, respectively.

[0047] The main positive connector 6, main negative connector 7, and communication connector 4 are connected to the main positive module, main negative module, and communication module respectively to realize the power supply and communication functions of the battery.

[0048] It is understood that the main positive module, the main negative module, and the communication module are conventional components of the battery pack, and will not be described in detail here.

[0049] In one embodiment of this application, a housing (not marked) is also included, wherein the welded portions of the housing walls are all fully welded structures.

[0050] The enclosure is fully welded, with few openings on the walls and all mounting holes using sealing rings to reduce the risk of leakage.

[0051] In addition, the box cover 7 is made of aluminum sheet by stamping, which meets the required strength while achieving a lightweight design.

[0052] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A secure, submerged battery pack, wherein, The battery pack comprises a battery box shell and a battery cell module pack, the battery cell module is soaked in immersion liquid, cooling liquid is stored in the battery box shell, the immersion liquid is injected into the battery box shell from a liquid injection port, and the cooling liquid enters from a liquid inlet of a liquid cooling plate.

2. The battery pack of claim 1, wherein, Further comprising: An installation and maintenance window is arranged on the box cover of the battery pack.

3. The battery pack of claim 1, wherein, The box cover is formed by stamping an aluminum plate.

4. The battery pack of claim 1, wherein, The immersion liquid is higher than the upper surface of the battery cell in the battery pack, and is injected into the battery box shell from the liquid injection port to stand and dissipate heat, the cooling liquid is circulated to dissipate heat, and the immersion liquid is used for standing and dissipating heat.

5. The battery pack of claim 1, wherein, Further comprising a sealing ring arranged at the installation hole position.

6. The battery pack of claim 1, wherein, A module fixing square channel and a fuse installation support are welded on the liquid cooling plate, and a slave control board installation support is welded on the inner side of the front side box wall.

7. The battery pack of claim 6, wherein, The module fixing square channel is connected with the battery cell of the battery pack.

8. The battery pack of claim 6, wherein, The fuse installation support is connected with a fuse, and the slave control board installation support is connected with a slave control board.

9. The battery pack of claim 8, wherein, Further comprising a total positive connector, a total negative connector and a communication connector, which are used to connect a total positive module, a total negative module and a communication module respectively.

10. The battery pack of claim 1, wherein, Further comprising a box body, and the box wall welding parts of the box body are all full welding structures.

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