Maintenance-friendly immersion battery pack

Abstract

The application discloses an immersed battery pack convenient to maintain, which comprises a BMU and a battery pack, the battery pack is immersed in cooling liquid, the BMU is arranged on an outer shell of the battery pack, the BMU is connected with the battery pack through a wire harness, and the BMU is isolated from the cooling liquid. By designing the BMU mounting shell to be integrally placed outside the battery pack, the battery pack top cover plate does not need to be disassembled, and the BMU does not need to be cleaned, so that the later maintenance is facilitated.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and more particularly to an easy-to-maintain immersion battery pack. Background Technology

[0002] In the field of liquid-cooled battery pack technology for energy storage, mainstream submerged battery packs integrate the battery management unit (BMU) directly inside the pack body, completely immersing it in a high-viscosity insulating immersion liquid. This design presents significant maintenance challenges. The reasons are as follows: during maintenance, the top cover of the battery pack needs to be disassembled, significantly increasing maintenance time and raising the risk of contamination of the immersion liquid inside the pack. Furthermore, after removal, the electrical components and PCB board of the BMU are extremely difficult to clean, requiring deep cleaning with specialized solvents. This not only significantly extends the maintenance cycle but also incurs additional high maintenance costs, severely restricting the operational efficiency and economic benefits of energy storage systems. Utility Model Content

[0003] This application provides an easy-to-maintain immersion battery pack.

[0004] The embodiments of this application adopt the following technical solutions:

[0005] In a first aspect, embodiments of this application provide an immersion battery pack, wherein the battery pack includes a BMU and a battery pack, the battery pack is immersed in a coolant, the BMU is disposed on the outer casing of the battery pack, the BMU is connected to the battery pack via a wiring harness, and the BMU is isolated from the coolant.

[0006] In some embodiments, the CCS harness within the battery pack is connected to the data interface on the BMU.

[0007] In some embodiments, the BMU is detachably connected to the outer casing of the battery pack.

[0008] In some embodiments, the BMU is mounted on the outer casing of the battery pack by means of nuts and screws.

[0009] In some embodiments, the battery pack includes multiple battery modules, each of which includes a battery cell.

[0010] In some embodiments, the CCS harness is disposed on the battery pack for collecting cell voltage and temperature information.

[0011] In some embodiments, the battery pack is injected with immersion fluid into the housing through the injection port, and the injection port is higher than the battery cells in the battery pack. When the immersion fluid is replaced, the valve on the drain port is opened.

[0012] In some embodiments, the housing is fixedly connected to the bottom liquid cooling plate, and the coolant circulates within the liquid cooling plate through the inlet and outlet of the liquid cooling plate to dissipate heat from the battery cells in the battery pack.

[0013] In some embodiments, the immersion liquid remaining stationary inside the casing is used to equalize the temperature difference of the cells in the battery pack.

[0014] In some embodiments, the BMU is mounted upside down on the outer casing of the battery pack.

[0015] The above-mentioned at least one technical solution adopted in the embodiments of this application can achieve the following beneficial effects: the battery pack includes a BMU and a battery pack, the battery pack is immersed in coolant, the BMU is disposed on the outer shell of the battery pack, the BMU is connected to the battery pack through a wiring harness, the BMU is isolated from the coolant, and by designing a BMU mounting shell, the entire BMU is placed outside the battery pack, eliminating the need to disassemble the top cover of the battery pack and clean the BMU, which facilitates later maintenance. Attached Figure Description

[0016] 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:

[0017] Figure 1 This is an exploded view of the immersion battery pack for easy maintenance in the embodiments of this application;

[0018] Figure 2 This is an isometric view of an immersion battery pack for easy maintenance, as described in an embodiment of this application.

[0019] Figure 3 This is a front view of an immersion battery pack for easy maintenance, as described in an embodiment of this application.

[0020] Figure 4 This is an exploded view of the BMU installation in an immersion battery pack for easy maintenance, as shown in the embodiments of this application.

[0021] Figure 5 For the immersion battery pack in the embodiments of this application that is easy to maintain Figure 1 Enlarged view of a portion of point A in the middle. Detailed Implementation

[0022] 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.

[0023] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0024] This application provides an embodiment of an immersion battery pack, such as Figure 1 The diagram shows an exploded view of an embodiment of the submersible battery pack of this application. The battery pack includes a BMU42 and a battery pack. The battery pack is submerged in coolant. The BMU42 is disposed on the outer shell of the battery pack. The BMU42 is connected to the battery pack via a wiring harness. The BMU42 is isolated from the coolant.

[0025] The BMU42 is isolated from the coolant by being mounted on the outer casing of the battery pack. Furthermore, the BMU42 is connected to the battery pack via a wiring harness. This not only completely isolates the BMU42 from the immersion environment, effectively preventing liquid corrosion and significantly improving component reliability and lifespan, but also greatly simplifies the installation and disassembly process. Maintenance can be performed without disassembling the battery pack main body; simply removing the BMU mounting shell allows for easy access. It also eliminates the need for specialized solvent cleaning, significantly improving maintenance efficiency and reducing operating costs.

[0026] like Figure 1 As shown, it specifically includes: pressure relief valve 1, battery pack cover 2, CCS wiring harness 20, battery cell 21, foam 22, fixed end plate 23, steel strip 24, sealing gasket 3, multi-core plug 32, battery module 4, BMU mounting hole 40, data interface 41, BMU 42, screw 43, box body 5, hoist hole 50, welded rivet nut 51, liquid injection port 6, welded stud 60, nut 61, liquid drain port 7, bottom liquid cooling plate 8, inlet 9, outlet 10, BMU mounting shell 11, and front box shell of battery pack 12.

[0027] Unlike related technologies where the BMU is integrated inside the battery pack and completely submerged in the immersion liquid, this design has significant drawbacks. Firstly, maintenance requires removing the top cover of the battery pack, which not only damages the sealing structure but also increases the risk of contaminating the immersion liquid. Secondly, the removed BMU is difficult to clean using conventional methods due to residual immersion liquid, requiring deep cleaning with specialized solvents, resulting in a cumbersome maintenance process and significantly increasing time and labor costs. The submersion battery pack in this embodiment solves these problems fundamentally by innovatively designing the BMU shell and welding rivet nuts to it, securing the BMU firmly to the shell with screws. This design completely isolates the BMU from the immersion liquid environment, effectively preventing liquid corrosion and significantly improving component reliability and lifespan. Simultaneously, the modular fixing structure greatly simplifies the installation and disassembly process; maintenance can be performed without disassembling the main battery pack, simply by removing the BMU shell, eliminating the need for specialized solvent cleaning, significantly improving maintenance efficiency and reducing operating costs.

[0028] In one embodiment of this application, the CCS harness 20 within the battery pack is connected to the data interface on the BMU42.

[0029] like Figure 3 As shown, the CCS harness 20 inside the battery pack can be led out through the multi-core plug 32 and then plugged into the data interface 41 on the BMU42. To save on wiring and facilitate plugging and unplugging, the BMU42 is preferably installed upside down on the BMU mounting shell 11.

[0030] In one embodiment of this application, the BMU42 is detachably connected to the outer casing of the battery pack.

[0031] When maintaining the BMU42, simply disconnect the CCS harness 20 from the data interface 41 of the BMU42, and then unscrew the nut 61. The BMU mounting shell 11 and the BMU42 can then be removed from the front casing 12 of the battery pack. No specific solvent is required for cleaning, and maintenance or replacement can be performed directly.

[0032] In one embodiment of this application, the BMU42 is mounted on the outer casing of the battery pack by means of a nut and screw.

[0033] like Figure 4 As shown, in specific implementation, the screw 43 is passed through the BMU mounting hole 40 and screwed into the welded rivet nut 51 on the BMU mounting shell 11 to fix it to the BMU mounting shell 11. The gourd hole 50 on the BMU mounting shell 11 is then passed through the welded stud 60 on the front shell 12 of the battery pack and tightened with the nut 61 to fix it to the front shell 12 of the battery pack. Figure 5 As shown.

[0034] In one embodiment of this application, the battery pack includes multiple battery modules, and each battery module includes a battery cell 21.

[0035] like Figure 2 As shown, the battery pack contains four battery modules 4, each consisting of 12 battery cells 21. Foam 22 is added between the battery cells 21 to provide cushioning and protect them. Fixed end plates 23 are added to both sides of the module to prevent the cells from being directly squeezed; the outermost layer is secured with two steel straps 24 to prevent deformation due to vibration during transportation.

[0036] In one embodiment of this application, the CCS harness 20 is disposed on the battery pack for collecting cell voltage and temperature information.

[0037] The CCS harness 20 is installed on top of the battery module 4 to collect information such as cell voltage and temperature; the pressure relief valve 1 is located on top of the battery pack to prevent the immersion liquid from blocking the valve on the pressure relief valve 1 and preventing pressure relief. A sealing gasket 3 is added between the battery pack cover 2 and the box body 5 to prevent immersion liquid leakage.

[0038] In one embodiment of this application, the battery pack is injected with immersion liquid into the box through the injection port, and the injection port is higher than the battery cells in the battery pack. When the immersion liquid is replaced, the valve on the drain port is opened.

[0039] In practice, the battery pack injects immersion liquid into the housing 5 through the injection port 6. The injection port 6 needs to be 3mm higher than the tab of the battery cell 21 to ensure that the battery cell 21 is completely submerged. When the immersion liquid is replaced later, the immersion liquid in the housing can be drained simply by opening the valve on the drain port 7.

[0040] In one embodiment of this application, the housing 5 is fixedly connected to the bottom liquid cooling plate, and the coolant circulates within the liquid cooling plate through the inlet and outlet of the liquid cooling plate to dissipate heat from the battery cells 21 in the battery pack.

[0041] The housing 5 and the bottom liquid cooling plate 8 are fixedly connected by welding. The coolant in the liquid cooling plate 8 is an aqueous solution of ethylene glycol. The coolant circulates within the liquid cooling plate 8 through the inlet 9 and outlet 10 to dissipate heat from the battery cell 21. The circulating coolant in the liquid cooling plate 8 can quickly remove the heat generated by the battery cell 21, preventing excessive temperature rise. The immersion liquid remaining in the housing 5 can effectively balance the temperature difference of the battery cell 21, keeping both the maximum temperature and temperature difference of the battery cell 21 within a reasonable range.

[0042] In one embodiment of this application, the immersion liquid remaining in the housing 5 is used to equalize the temperature difference of the cells in the battery pack.

[0043] The battery pack injects immersion liquid into the housing 5 through the injection port 6. The injection port 6 needs to be 3mm higher than the tab of the battery cell 21 to ensure that the battery cell 21 is completely submerged. When the immersion liquid is replaced later, the immersion liquid in the housing can be drained by simply opening the valve on the drain port 7.

[0044] The housing 5 and the bottom liquid cooling plate 8 are fixedly connected by welding, and the coolant in the liquid cooling plate 8 is an aqueous solution of ethylene glycol.

[0045] The coolant circulates within the liquid cooling plate 8 through inlet 9 and outlet 10 to dissipate heat from the battery cell 21. The circulating coolant within the liquid cooling plate 8 quickly removes the heat generated by the battery cell 21, preventing excessive temperature rise. The immersion liquid remaining stationary within the housing 5 effectively balances the temperature difference of the battery cell 21, keeping both the maximum temperature and temperature difference of the battery cell 21 within a reasonable range.

[0046] In one embodiment of this application, the BMU42 is mounted upside down on the outer casing of the battery pack.

[0047] The CCS harness 20 inside the battery pack is led out through the multi-core plug 32 and needs to be plugged into the data interface 41 on the BMU42. In order to save wires and facilitate plugging and unplugging, the BMU42 is installed upside down on the BMU mounting shell 11.

[0048] 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. An easy-to-maintain submersible battery pack, wherein, The battery pack includes a BMU and a battery pack, the battery pack being immersed in coolant, the BMU being disposed on the outer casing of the battery pack, the BMU being connected to the battery pack via a wiring harness, and the BMU being isolated from the coolant.

2. The submersible battery pack as described in claim 1, wherein, The CCS harness inside the battery pack is connected to the data interface on the BMU.

3. The submersible battery pack as described in claim 1, wherein, The BMU is detachably connected to the outer casing of the battery pack.

4. The submersible battery pack as described in claim 3, wherein, The BMU is mounted on the outer casing of the battery pack by means of nuts and screws.

5. The submersible battery pack as described in claim 1, wherein, The battery pack includes multiple battery modules, and each battery module includes a battery cell.

6. The submersible battery pack as described in claim 2, wherein, The CCS harness is installed on the battery pack to collect cell voltage and temperature information.

7. The submersible battery pack as claimed in claim 1, wherein, The battery pack is injected with immersion liquid into the tank through the injection port, and the injection port is higher than the battery cells in the battery pack. When the immersion liquid is replaced, the valve on the drain port is opened.

8. The submersible battery pack as described in claim 7, wherein, The housing is fixedly connected to the bottom liquid cooling plate, and the coolant circulates within the liquid cooling plate through the inlet and outlet of the liquid cooling plate to dissipate heat from the battery cells in the battery pack.

9. The submersible battery pack as described in claim 7, wherein, The immersion liquid placed inside the box is used to equalize the temperature difference of the battery cells in the battery pack.

10. The submersible battery pack as claimed in claim 1, wherein, The BMU is mounted upside down on the outer casing of the battery pack.

Images