An oil-immersed power battery module

Abstract

The utility model discloses an oil -immersed power battery module relates to battery module technical field, including the shell body, the heater is installed in the both sides and bottom embedding of shell body inner wall, the temperature sensor is installed to the inner wall, the bottom fixed connection support plate, the inside fills square shed oil (or inert insulating liquid), and the electric core mounting support includes second connecting rod and four support plates, and the flexible installation and fixed of electric core are realized through the structure such as sliding slot, sliding block, bolt. The top of shell body is equipped with upper cover, and one side installs low pressure signal plug -in and direct current high voltage plug -in, and the other side is connected with radiator, circulating pump and so on and constitutes temperature -controlled circulating system. The utility model discloses through the insulating property and heat conduction characteristic of square shed oil, cooperates the intelligent linkage of heater, temperature sensor, circulating pump, radiator and so on structure, has realized the even heating, high -efficient heat dissipation and wide temperature range temperature control to electric core, simultaneously, adjustable support and full -sealing design compression electric core interval, reduce module volume, improve energy density.

Description

Technical Field

[0001] This utility model relates to the field of battery module technology, and in particular to an oil-immersed power battery module. Background Technology

[0002] Existing power battery cooling solutions typically employ liquid cooling pipes or air cooling, which have the following drawbacks: Uneven heat dissipation: The density of liquid cooling pipes directly affects the heat dissipation effect. Temperature gradients are easily formed between battery cells, leading to the risk of local overheating. Air cooling relies on convection, which has low heat dissipation efficiency and is significantly affected by ambient wind speed.

[0003] Large volume redundancy: In order to ensure heat dissipation, a large gap needs to be reserved between the cells, resulting in low module volume utilization. For the same capacity, the module volume is larger than that of the oil-immersed solution.

[0004] Low heat preservation efficiency: Traditional heating methods (such as bottom heating film) have a single heat conduction path, resulting in a large temperature difference between the top and bottom of the battery cell during heating. It takes a long time to heat up to the working temperature, which cannot meet the rapid start-up requirements in low-temperature environments. Utility Model Content

[0005] This utility model discloses an oil-immersed power battery module, which aims to solve the technical problems in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An oil-immersed power battery module includes an outer casing and a cell mounting bracket. Heaters are embedded in both sides and the bottom of the inner wall of the outer casing. A temperature sensor is installed on the inner wall of the outer casing. A support plate is fixedly connected to the bottom of the inner wall of the outer casing. The outer casing is filled with potash oil (or an inert insulating liquid).

[0007] The battery cell mounting bracket includes a second connecting rod and four support plates, which are divided into two groups of left and right support plates facing each other. Each support plate has a sliding groove and a through opening at its top. Both ends of the second connecting rod are fixedly connected to sliders, and the top of each slider has a second threaded hole into which a second bolt is threadedly connected. The top surfaces of the two lower support plates are fixedly connected to first connecting rods. One side of each first connecting rod has a through groove, and the top of each first connecting rod has a slot into which a rod is inserted. The bottom of each rod has a first threaded hole into which a first bolt is threadedly connected. Battery cells are placed between the four support plates.

[0008] In a preferred embodiment, the slider is slidably engaged with the groove, the top end of the insert rod is fixed to the bottom end surface of the two upper support plates, and the two lower support plates are fixed to the bottom of the inner wall of the outer casing.

[0009] In a preferred embodiment, the nut end of the first bolt overlaps the outer surface of the first connecting rod, and the threaded end of the first bolt moves through the through groove.

[0010] In a preferred embodiment, the nut end of the second bolt overlaps the top surface of the support plate, and the threaded end of the second bolt moves through the through-hole.

[0011] In a preferred embodiment, the top of the housing is provided with an upper cover, and a low-voltage signal plug and a DC high-voltage plug are installed on one side panel of the housing.

[0012] In a preferred embodiment, a radiator is fixedly mounted on the outer surface of the other side panel of the housing, and a cooling fan is installed on the radiator, with a gap between the cooling fan and the radiator. In a preferred embodiment, a circulation pump is installed at the top input port of the radiator, and a pipe is connected to the input end of the circulation pump. A pipe is also connected to the bottom output port of the radiator, and a pressure buffer device is installed on the return pipe of the radiator.

[0013] In a preferred embodiment, the two pipes each penetrate one side plate of the outer casing and are arranged vertically.

[0014] As can be seen from the above, the oil-immersed power battery module provided by this utility model has the following technical effects.

[0015] Firstly, by combining heaters embedded on both sides and bottom of the inner wall of the outer casing with temperature sensors, the temperature sensors monitor the oil temperature in real time, and the heaters intelligently heat the oil in the square container based on the monitoring data, thus achieving uniform heating of the battery cell and eliminating the large temperature difference caused by traditional local heating.

[0016] Secondly, through the cooperation of the support plate, slide groove, slider, second connecting rod and second bolt of the battery cell mounting bracket, the slider slides in the slide groove to adjust the spacing of the support plate, and then is fixed by the second bolt, thus achieving the effect of flexibly installing battery cells of different specifications and forming an oil flow channel.

[0017] Thirdly, through the cooperation of the first connecting rod, slot, insert rod and the first bolt, the insert rod is inserted into the slot and then fixed by the first bolt passing through the through slot, thus achieving the effect of adjustable upper and lower support plates and stable fixation of the battery cell.

[0018] Fourthly, the sealing fit between the top cover and the outer casing, along with the internal filling with square oil, achieves the effects of full-sealed insulation, compressed cell spacing, and reduced module volume.

[0019] Fifthly, through the cooperation of the circulating pump, pipes, radiator and cooling fan on one side of the outer casing, the circulating pump drives the hot oil to flow through the radiator, and the cooling fan accelerates the heat dissipation and the low-temperature oil flows back, achieving the effect of rapid heat dissipation and control of cell temperature in high-temperature environments.

[0020] Sixth: By cooperating with the pressure buffer device on the radiator return pipe and the circulation system, the oil volume changes due to thermal expansion and contraction are accommodated, and the system pressure is balanced, thereby preventing oil leakage and improving system stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an oil-immersed power battery module proposed in this utility model.

[0022] Figure 2 This is a front sectional view of an oil-immersed power battery module proposed in this utility model.

[0023] Figure 3 This is a top cross-sectional view of an oil-immersed power battery module proposed in this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of a cell mounting bracket for an oil-immersed power battery module proposed in this utility model.

[0025] Figure 5 This is a schematic diagram of the structure of the first adjustment component in an oil-immersed power battery module proposed in this utility model.

[0026] Figure 6 This is a schematic diagram of the structure of the first connecting rod, slot and through groove connection of an oil-immersed power battery module proposed in this utility model.

[0027] Figure 7 This is a schematic diagram of the connection between the plug rod and the first threaded hole of an oil-immersed power battery module proposed in this utility model.

[0028] Figure 8 This is a schematic diagram of the structure of the first bolt of an oil-immersed power battery module proposed in this utility model.

[0029] Figure 9 This is a schematic diagram of the structure of the second adjustment component of an oil-immersed power battery module proposed in this utility model.

[0030] Figure 10This is a schematic diagram of the structure of the second connecting rod, slider, and second threaded hole connection of an oil-immersed power battery module proposed in this utility model.

[0031] Figure 11 This is a schematic diagram of the structure of the second bolt of an oil-immersed power battery module proposed in this utility model.

[0032] In the attached diagram: 1. Low-voltage signal plug-in; 2. DC high-voltage plug-in; 3. Temperature sensor; 4. Heater; 5. Housing; 6. Battery cell; 7. Battery cell mounting bracket; 701. Support plate; 702. Slide groove; 703. Through port; 704. Second connecting rod; 705. Slider; 706. Second threaded hole; 707. Second bolt; 708. First connecting rod; 709. Through groove; 7010. Slot; 7011. Insert rod; 7012. First threaded hole; 7013. First bolt; 8. Top cover; 9. Square oil; 10. Circulation pump; 11. Pipeline; 12. Pressure buffer device; 13. Radiator; 14. Cooling fan. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] The oil-immersed power battery module disclosed in this utility model is mainly used to solve the problems of current power batteries experiencing performance degradation, capacity decay, poor heat dissipation, insufficient heat preservation, and weak environmental adaptability due to changes in ambient temperature.

[0036] Reference Figures 1 to 11 An oil-immersed power battery module includes an outer shell 5 and a cell mounting bracket 7. Heaters 4 are embedded in both sides and the bottom of the inner wall of the outer shell 5. Temperature sensors 3 are installed on the inner wall of the outer shell 5. There are three temperature sensors 3, which are distributed at the top, middle and bottom of the inner wall of the outer shell 5. A support plate 701 is fixedly connected to the bottom of the inner wall of the outer shell 5. The outer shell 5 is filled with styrene oil 9 or an inert insulating liquid as an insulating medium.

[0037] Pressure buffer device 12, radiator 13, cooling fan 14, temperature sensor 3, circulating pump 10, low-voltage signal plug-in 1 and DC high-voltage plug-in 2, all of which are selected according to the specified specifications and models of the equipment products.

[0038] Preferably, the insulating oil 9 or the inert insulating liquid is No. 45 naphthenic oil or paraffinic oil, or other inert insulating liquids such as silicone oil or fluorinated liquid are used to ensure the electrical safety of the cell 6 in the immersion environment.

[0039] The battery cell mounting bracket 7 includes a second connecting rod 704 and four support plates 701, which are divided into two groups of left and right support plates 701, facing each other. Each support plate 701 has a sliding groove 702 and a through opening 703 at its top. Both ends of the second connecting rod 704 are fixedly connected to sliders 705. The top of each slider 705 has a second threaded hole 706, into which a second bolt 707 is threaded. The top surfaces of the two lower support plates 701 are fixedly connected to first connecting rods 708. One side of each first connecting rod 708 has a through groove 709, and the top of each first connecting rod 708 has a slot 7010 into which a plug is inserted. The rod 7011 has a first threaded hole 7012 at its bottom, and a first bolt 7013 is connected to the first threaded hole 7012 by an internal thread. The slider 705 is slidably fitted into the groove 702. The top of the rod 7011 is fixed to the bottom surface of the two upper support plates 701, and the two lower support plates 701 are fixed to the bottom of the inner wall of the outer shell 5. The nut end of the first bolt 7013 overlaps the outer surface of the first connecting rod 708, and the threaded end of the first bolt 7013 moves through the through groove 709. The nut end of the second bolt 707 overlaps the top surface of the support plate 701, and the threaded end of the second bolt 707 moves through the through opening 703. The battery cell 6 is placed between the four support plates 701.

[0040] The four support plates 701 are divided into two groups, each group being symmetrical from left to right. The two lower groups are fixed to the bottom of the outer shell 5, and the two upper groups of support plates 701 are connected to the lower support plates 701 through insert rods 7011.

[0041] The sliders 705 at both ends of the second connecting rod 704 are embedded in the grooves 702 of the support plate 701, and the spacing can be adjusted laterally. The first bolt 7013 and the second bolt 707 fix the position of the insert rod 7011 and the slider 705 by thread.

[0042] When installing the battery cell 6, slide the second connecting rod 704, and move the slider 705 within the groove 702 to adjust the distance between the left and right support plates 701 to accommodate different sizes of battery cells 6. The upper support plate 701 is inserted into the slot 7010 of the lower first connecting rod 708 via the insertion rod 7011, and fixed with the first bolt 7013 passing through the through groove 709. Fine-tune the height. The second bolt 707 passes through the through opening 703 to fix the slider 705, ensuring the stability of the battery cell mounting bracket 7. The battery cell mounting bracket 7 forms an oil flow channel, allowing the square oil 9 to flow evenly across the surface of the battery cell 6, enhancing heat exchange. The modular design supports quick replacement of the battery cell 6 and is compatible with multiple specifications.

[0043] Reference Figures 1 to 3 In a preferred embodiment, the top of the outer casing 5 is provided with an upper cover 8. The outer casing 5 and the upper cover 8 are designed to be fully sealed and fixed by bolts. A low-voltage signal plug-in 1 and a DC high-voltage plug-in 2 are installed on one side plate of the outer casing 5. The low-voltage signal plug-in 1 and the DC high-voltage plug-in 2 are used for signal interaction and power output, respectively. The low-voltage signal plug-in 1 is connected to an external battery management system to monitor the data of the temperature sensor 3 in real time. The DC high-voltage plug-in 2 outputs electrical energy. A heat sink 13 is fixedly installed on the outer surface of the other side plate of the outer casing 5. A cooling fan 14 is installed on the heat sink 13, and a gap is left between the cooling fan 14 and the heat sink 13. A circulation pump 10 is installed at the top input port of the heat sink 13. A pipe 11 is connected to the input end of the circulation pump 10. A pipe 11 is also connected to the bottom output port of the heat sink 13. A pressure buffer device 12 is installed on the return pipe of the heat sink 13. The two pipes 11 pass through one side plate of the outer casing 5 and are distributed vertically.

[0044] Heaters 4 are embedded in the sides and bottom of the outer casing 5 and arranged in groups. Temperature sensors 3 are installed on the inner wall of the outer casing to monitor oil temperature. Circulation pump 10 is connected to pipe 11 to drive the square oil 9 to circulate between the outer casing 5 and the radiator 13. Cooling fan 14 accelerates heat dissipation. Pressure buffer device 12 balances system pressure.

[0045] After the module is assembled, it is sealed by injecting square oil 9 and then sealing it with the top cover 8 to form a fully enclosed space. The insulation of the square oil 9 allows for compression of the spacing between the battery cells 6.

[0046] Working principle: I. Initial State and Module Preparation: Structural sealing and media filling: The lower support plate 701 is fixed at the bottom of the outer casing 5, and the upper support plate 701 is assembled by the first connecting rod 708, the insert rod 7011, and the first bolt 7013 to form the cell mounting bracket 7.

[0047] The battery cells 6 are installed between the bracket support plates 701. The spacing is adjusted and fixed by the second connecting rod 704, the slider 705 and the second bolt 707 to ensure that there is an oil flow channel between the battery cells 6.

[0048] Cover the outer casing 5 with the top cover 8, and inject square oil 9 or inert insulating liquid through the reserved oil hole until the entire internal space is filled. Use its insulation to compress the spacing between the battery cells 6 and reduce the module volume.

[0049] Electrical connections and sensor initialization: The low-voltage signal plug-in 1 is connected to the external battery management system (BMS) to receive data and control commands from the temperature sensor 3; the DC high-voltage plug-in 2 is connected to the battery cell 6 and serves as an external charging and discharging interface.

[0050] Temperature sensor 3 monitors the temperature of the oil in the container 9 in real time, and is distributed at least at the bottom, middle and top of the module to detect the temperature gradient.

[0051] II. Heating and heat preservation during operation in low-temperature environments: 1. Heater 4 startup and oil heating: When the temperature sensor 3 detects a drop in oil temperature, the BMS triggers the heater 4, which is embedded in the outer casing 5, to start on both sides and the bottom, and to heat the square oil 9 in groups.

[0052] The square-shaped oil 9 serves as a heat conduction medium, which evenly transfers heat to the surface of the battery cell 6 through natural convection, avoiding the local temperature difference problem of traditional bottom heating.

[0053] 2. Circulating pump 10 low-speed auxiliary convection: If the oil temperature rises slowly or the temperature difference is small, the circulation pump 10 starts at low speed, driving the square oil 9 from the bottom of the outer casing 5 through the pipe 11 into the radiator 13. At this time, the cooling fan 14 does not work, and then flows back from the top to the module, enhancing the oil flow and accelerating the heat dissipation.

[0054] The bracket structure fixed by the first bolt 7013 and the second bolt 707 ensures that the oil flows evenly between the cells 6, eliminating heating blind spots.

[0055] 3. Temperature balance and heat preservation When the oil temperature is reached, heater 4 switches to low-power heat preservation mode, circulation pump 10 stops, and the temperature of battery cell 6 is maintained by the heat capacity of the square oil 9.

[0056] The pressure buffer device 12 monitors the system pressure, accommodates the volume of oil that expands due to heat, and prevents leakage from the sealing housing 5 due to increased pressure.

[0057] III. Heat dissipation and cooling during operation in high-temperature environments: 1. Circulating pump drives oil for cooling: When the battery cell 6 generates heat during charging and discharging, causing the oil temperature to rise, the circulation pump 10 starts operating, pumping the high-temperature square oil 9 from the top of the outer casing 5 through the pipe 11 into the radiator 13.

[0058] The fin structure of the radiator 13 increases the contact area between the oil and the air, while the cooling fan 14 blows air to accelerate the cooling of the hot oil.

[0059] 2. Low-temperature oil reflux and heat exchange: After cooling, the square-shaped oil 9 flows back from the bottom of the radiator 13 through the pipe 11 to the bottom of the outer casing 5, and flows through the oil flow channel between the supports to the surface of the battery cell 6, absorbing heat and then circulating again.

[0060] Temperature sensor 3 monitors the return oil temperature in real time. If the temperature difference is large, the external battery management system adjusts the speed of circulation pump 10 or starts local heater 4 to balance the temperature.

[0061] 3. Pressure control and heat dissipation termination: The pressure buffer device 12 releases the pressure fluctuations generated during the cycle, ensuring stable system operation.

[0062] When the oil temperature drops to the specified temperature, the circulation pump 10 and the cooling fan 14 stop, and the system enters a natural cooling state.

[0063] IV. Intelligent Adjustment in Extreme Environments: When heater 4 operates at full power, and in conjunction with circulating pump 10 stirring the oil at low speed, the oil temperature is raised to above 0°C within 30 minutes, and the capacity decay of battery cell 6 is controlled within 10%.

[0064] The low freezing point of Fangpeng Oil 9 prevents the medium from freezing and ensures low-temperature fluidity.

[0065] The circulation pump 10 and cooling fan 14 work continuously to keep the surface temperature of the cell 6 within the specified temperature to prevent overheating from causing battery life degradation.

[0066] The fully sealed outer casing 5 isolates external heat sources, and the high insulation of the square-shaped oil 9 allows for a compact layout of the battery cells 6, avoiding the problem of insufficient heat conduction efficiency in traditional air cooling.

[0067] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. An oil-immersed power battery module, comprising a housing (5), characterized in that, Heaters (4) are embedded in both sides and bottom of the inner wall of the outer shell (5). Temperature sensors (3) are installed on the inner wall of the outer shell (5). A support plate (701) is fixedly connected to the bottom of the inner wall of the outer shell (5). The outer shell (5) is filled with styrene oil (9). It also includes a cell mounting bracket (7), which includes a second connecting rod (704) and four support plates (701), and is divided into two groups of left and right support plates (701), which are distributed opposite to each other. The support plates (701) are provided with a sliding groove (702), and the top of the support plates (701) is provided with an opening (703). Both ends of the second connecting rod (704) are fixedly connected with sliders (705), and the top of the sliders (705) is provided with a second threaded hole (706). The second threaded hole (706) is threaded with a screw. The second bolt (707) is fixedly connected to the top surface of the two support plates (701) below, and the first connecting rod (708) is fixedly connected to the top surface of the two support plates (701). The first connecting rod (708) has a through groove (709) on one side and a slot (7010) on the top of the first connecting rod (708). A plug rod (7011) is inserted into the slot (7010). The bottom of the plug rod (7011) has a first threaded hole (7012). The first bolt (7013) is threaded into the first threaded hole (7012). The battery cell (6) is placed between the four support plates (701).

2. The oil-immersed power battery module according to claim 1, characterized in that, The slider (705) is slidably fitted into the groove (702), the top end of the insert (7011) is fixed on the bottom end surface of the two upper support plates (701), and the two lower support plates (701) are fixed on the bottom of the inner wall of the outer shell (5).

3. The oil-immersed power battery module according to claim 1, characterized in that, The nut end of the first bolt (7013) overlaps the outer surface of the first connecting rod (708), and the threaded end of the first bolt (7013) moves through the through groove (709).

4. The oil-immersed power battery module according to claim 1, characterized in that, The nut end of the second bolt (707) overlaps the top surface of the support plate (701), and the threaded end of the second bolt (707) moves through the through-hole (703).

5. The oil-immersed power battery module according to claim 1, characterized in that, The top of the outer casing (5) is provided with an upper cover (8), and a low-voltage signal plug (1) and a DC high-voltage plug (2) are installed on one side plate of the outer casing (5).

6. The oil-immersed power battery module according to claim 1, characterized in that, A radiator (13) is fixedly installed on the outer surface of the other side plate of the outer shell (5). A cooling fan (14) is installed on the radiator (13), and a gap is left between the cooling fan (14) and the radiator (13).

7. An oil-immersed power battery module according to claim 6, characterized in that, A circulation pump (10) is installed at the top input port of the radiator (13), and a pipe (11) is installed at the input end of the circulation pump (10). A pipe (11) is also installed at the bottom output port of the radiator (13). A pressure buffer device (12) is installed on the return pipe of the radiator (13).

8. The oil-immersed power battery module according to claim 7, characterized in that, The two pipes (11) pass through one side plate of the outer shell (5) respectively, and are distributed at the top and bottom.

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