A side-bottom double-channel liquid cooling immersion type battery box

Abstract

The application discloses a kind of double-channel liquid cooling immersion battery box of side bottom, it is based on directly immersed in synthetic oil in battery module, make heat source battery, aluminum row etc. and synthetic oil direct contact fully, heat dissipation is more uniform, efficient, can effectively reduce the temperature gradient of battery, reduce local overheating phenomenon.The main heat dissipation mode is through the heat conduction of battery aluminum row etc. to synthetic oil, then utilize the new cooling scheme that two channels of liquid cooling device, liquid cooling bottom plate take away heat in synthetic oil.Compared with traditional liquid cooling battery box, namely only utilize bottom cooling waterway to cool the mode, with more obvious cooling advantage, because this contact conduction has greater contact surface area, can more efficiently carry out heat exchange, solve the existing battery " head hot foot cold " pain point problem of traditional liquid cooling, improve the service life of battery.Moreover, compared with the cost of cooling circulating dynamic oil scheme, the reliability is higher.

Description

Technical Field

[0001] This invention relates to the field of battery boxes, specifically a side-bottom dual-channel liquid-cooled immersion battery box. Background Technology

[0002] Battery modules generate heat during charging and discharging. Excessive temperature and uneven localized temperature distribution within the battery can severely reduce battery life. The heat dissipation performance of the battery module is a crucial factor affecting battery performance, efficiency, lifespan, and safety. Currently, existing liquid-cooled battery pack structures use cooling channels at the bottom for heat dissipation. However, this results in uneven cell temperatures, significantly reducing the battery's operating temperature range and the overall energy efficiency of the battery pack, shortening battery life, and potentially posing safety hazards.

[0003] Problems with existing technology:

[0004] 1. The temperature distribution of the modules inside the existing battery box is uneven, with local overheating, which is not conducive to the long-term use of the battery system and cannot guarantee safety and reliability;

[0005] 2. The liquid-cooled battery boxes used in the market only dissipate heat through bottom liquid cooling. The temperature of the cell terminals and aluminum busbars is still too high and they are the main heat sources, resulting in a large temperature difference in the overall battery box.

[0006] 3. Existing immersion battery boxes rely on oil circulation for cooling, which has many drawbacks, such as the complex oil circulation path, potential oil leakage, and difficulties in after-sales service.

[0007] Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. Summary of the Invention

[0008] The purpose of this invention is to provide a side-bottom dual-channel liquid-cooled immersion battery box to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A dual-channel liquid-cooled immersion battery box with a side and bottom, comprising a battery box; a battery module is disposed inside the battery box and immersed in insulating synthetic oil; liquid cooling inlet and outlet are respectively connected to the left and right sides of the base at the front end of the battery box; it also includes a side liquid cooling device, which includes an upper liquid inlet plate and a lower liquid outlet plate, both of which are hollow; and several evenly spaced heat exchange plates are connected to the rear side of the upper liquid inlet plate and the lower liquid outlet plate, with U-shaped flow channels opened in the heat exchange plates, the upper and lower ends of the flow channels being connected to the upper liquid inlet plate and the lower liquid outlet plate respectively; the flow channel structure is simple.

[0011] The front ends of the upper liquid inlet plate and the lower liquid outlet plate are respectively connected to the liquid cooling channel inlet and liquid cooling channel outlet.

[0012] Furthermore, the side liquid cooling device is integrally formed by extruding profiles into pipes and then welding them together.

[0013] Furthermore, the side liquid cooling device is made of aluminum tubes, copper tubes, or other metal tubes that have been bent and welded.

[0014] Furthermore, the side liquid cooling device is injection molded from non-metallic tubing.

[0015] Furthermore, a fixing strip is also provided on the rear side of the side liquid cooling device.

[0016] Furthermore, the liquid cooling base plate inlet and outlet are used for the entry and discharge of coolant inside the liquid cooling base plate, respectively; the liquid cooling base plate is serpentine in shape and hollow inside; the liquid cooling base plate inlet, liquid cooling base plate and liquid cooling base plate outlet constitute the bottom cooling system.

[0017] Furthermore, the fixing strip is connected to the rear end of the heat exchange plate via an elastic fixing device.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The insulating synthetic oil (I-10℃ transformer oil) used in the submersible battery box has the advantages of high flash point, good insulation and large specific heat capacity, which can put the battery box in a safer environment than ordinary liquid cooling, and can effectively ensure the fire protection of the battery box.

[0020] 2. Cooling is achieved simultaneously through a side liquid cooling device and a bottom cooling system. The heat generated by the battery cell is exchanged with the cooling system to achieve cooling. This invention allows for cooling across the entire module, ensuring thorough and efficient heat exchange and cooling of the entire immersed oil system. This improves overall cooling performance, extends battery life, and enhances safety.

[0021] 3. The dual-channel liquid cooling solution ensures that the battery cell is in a temperature range that is more friendly to its performance. Even with multiple continuous charge and discharge cycles, the temperature rise and maximum temperature are still significantly better than the current liquid cooling method, greatly reducing the probability of thermal runaway of the battery cell from the source. Attached Figure Description

[0022] Figure 1 This is an exploded view of a side-bottom dual-channel liquid-cooled immersion battery box.

[0023] Figure 2 This is a schematic diagram of a side-bottom dual-channel liquid-cooled immersion battery box.

[0024] Figure 3This is a front view of a dual-channel liquid-cooled immersion battery box with a side and bottom.

[0025] Figure 4 This is a top view of a dual-channel liquid-cooled immersion battery box with side and bottom cooling.

[0026] Figure 5 for Figure 4 Sectional view along the AA direction.

[0027] Figure 6 This is a schematic diagram of the internal structure of a side-bottom dual-channel liquid-cooled immersion battery box after removing the top cover.

[0028] Figure 7 This is a schematic diagram of the side liquid cooling device in a dual-channel liquid-cooled immersion battery box.

[0029] Figure 8 This is a schematic diagram of the bottom cooling system in a dual-channel liquid-cooled immersion battery box.

[0030] Figure 9 A schematic diagram of the side liquid cooling device in some embodiments of this solution.

[0031] Figure 10 exist Figure 9 A magnified view of a portion of point a.

[0032] Figure 11 A schematic diagram of the structure of the elastic fixing device in some embodiments of this solution.

[0033] Figure 12 A schematic diagram of the elastic fixing device from another angle in some embodiments of this solution. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] Please see Figure 1-8 A side-bottom dual-channel liquid-cooled immersion battery box, comprising a battery box 1;

[0036] The battery box 1 is equipped with a battery module 2, which is immersed in insulating synthetic oil. The insulating synthetic oil is transformer oil of grade I-10℃, which has the advantages of high flash point, good insulation and large specific heat capacity.

[0037] The front end of the battery box 1 has a liquid cooling plate outlet 102 and a liquid cooling plate inlet 101 respectively connected to the left and right sides of the base; such as Figure 8 As shown, the liquid cooling base plate inlet 101 and liquid cooling base plate outlet 102 are used for the entry and discharge of coolant inside the liquid cooling base plate 103, respectively; the liquid cooling base plate 103 is serpentine in shape and hollow inside; the liquid cooling base plate inlet 101, liquid cooling base plate 103 and liquid cooling base plate outlet 102 constitute the bottom cooling system;

[0038] It also includes a side liquid cooling device 2, which includes an upper liquid inlet plate 201 and a lower liquid outlet plate 202. Both the upper liquid inlet plate 201 and the lower liquid outlet plate 202 are hollow. At the same time, the rear side of the upper liquid inlet plate 201 and the lower liquid outlet plate 202 is connected to a number of evenly spaced heat exchange plates 203.

[0039] In this scheme, multiple sets of battery modules 2 are arranged at intervals, and heat exchange plates 203 are located between adjacent battery modules 2;

[0040] The heat exchange plate 203 has a U-shaped flow channel 204, and the upper and lower ends of the flow channel 204 are respectively connected to the upper liquid inlet plate 201 and the lower liquid outlet plate 202.

[0041] The side liquid cooling device 2 is also provided with a fixing strip 3 on the rear side. The fixing strip 3 is fixedly connected to the rear end of the heat exchange plate 203. The left and right ends of the fixing strip 3 are fixedly connected to the side wall of the battery box 1, thereby ensuring that the rear end of the heat exchange plate 203 of the side liquid cooling device 2 is supported.

[0042] The front ends of the upper liquid inlet plate 201 and the lower liquid outlet plate 202 are respectively connected to the liquid cooling channel inlet 205 and the liquid cooling channel outlet 206.

[0043] Coolant enters the upper inlet plate 201 from the liquid cooling channel inlet 205. The coolant in the upper inlet plate 201 enters the flow channel from above the front end of the flow channel 204, then enters the lower drain plate 202 from the bottom of the flow channel 204, and finally exits from the liquid cooling channel outlet 206.

[0044] The advantage of this scheme is that the coolant temperature entering the upper inlet plate 201 is lower, while the transformer oil temperature in the battery box 1 will rise. At this time, the temperature difference between the coolant near the upper inlet plate 201 and the transformer oil will be greater than that of other locations, and its heat exchange efficiency will be higher. This is because when the temperature difference increases, the heat transfer rate from the high temperature zone to the low temperature zone increases, the thermal resistance decreases, and the heat transfer coefficient increases.

[0045] The side liquid cooling device 2 is made of profile extrusion pipe and then welded together. It can also be replaced by aluminum pipe, copper pipe or other metal pipes bent and welded or non-metallic pipes.

[0046] If it is a non-metallic tube, it can be injection molded from plastic.

[0047] Side liquid cooling unit installation and fixing method: First, install the module, then install the side liquid cooling unit on the side of the module. Next, fix the fixing strip to the side liquid cooling unit with screws to prevent loosening. Then fix the fixing strip to the inner wall of the battery box. Then, use nuts and sealing rings to fix the inlet and outlet water outlets to the battery box panel to ensure the overall sealing of the battery box. Finally, structural adhesive can be used for further fixing to ensure the firmness of the side liquid cooling unit.

[0048] The principle of this design is that the coolant enters through the two inlets on the right side and returns through the two outlets on the left side, as shown in the attached diagram. Figure 3 The battery module 2 is cooled by simultaneously cooling the cells through a side liquid cooling device and a bottom liquid cooling plate. The heat generated by the cells is then exchanged with the cooling system to achieve a cooling effect.

[0049] This invention enables cooling across all modules, allowing for thorough and efficient heat exchange and cooling of the entire immersed oil system. This improves overall cooling performance, extends battery life, and enhances safety.

[0050] like Figure 9-12 In some embodiments of this solution, the fixing strip 3 is connected to the rear end of the heat exchange plate 203 via an elastic fixing device 310;

[0051] When battery module 2 is working, it heats the insulating synthetic oil, which in turn heats the heat exchange plate 203. Since this heating is not uniform, the heat exchange plate 203 will experience thermal stress due to uneven heating, causing the plate to deform. If the fixing strip 3 is welded to the rear end of the heat exchange plate 203, the stress from the plate deformation will concentrate at the weld point. After repeated starts and stops of battery module 2, the weld point between the fixing strip 3 and the rear end of the heat exchange plate 203 may break. However, this solution uses an elastic fixing device 310 to connect the fixing strip 3 and the heat exchange plate 203. Therefore, the deformation of the heat exchange plate 203 will be absorbed by the elastic fixing device 310, thus ensuring that the rear end of the heat exchange plate 203 is always supported.

[0052] Specifically, the elastic fixing device 310 includes a fixing frame 311, the top of the fixing frame 311 is fixedly connected to the fixing strip 3 by bolts, the center of the fixing frame 311 has a circular mounting groove 312, the inner wall of the mounting groove 312 is fixedly connected to a central disk 314 by a number of arc-shaped elastic connecting pieces 313, wherein the central disk 314 is located at the center of the mounting groove 312, and the elastic connecting pieces 313 are arranged in a circular array, and a connecting shaft 315 is provided at one end of the central disk 314, the end of the connecting shaft 315 is fixedly connected to the heat exchange plate 203 by bolts, and a gap is provided between the central disk 314 and the heat exchange plate 203;

[0053] When this solution is put into use, even if the rear end of the heat exchange plate 203 shifts horizontally or vertically, the arc-shaped elastic connecting piece 313 can deform accordingly, thereby absorbing the stress generated by these deformations. This ensures that the rear end of the heat exchange plate 203 remains fixed.

[0054] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are used only for the convenience of describing this invention and for 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 invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A side-bottom dual-channel liquid-cooled immersion battery case, comprising a battery case; characterized in that, The battery box contains battery modules immersed in insulating synthetic oil. Liquid cooling inlets and outlets are respectively connected to the left and right sides of the base at the front of the battery box. These inlets and outlets allow coolant to enter and exit the liquid cooling plate. The liquid cooling plate is serpentine in shape and hollow inside. The liquid cooling inlet, base, and outlet constitute a bottom cooling system. The system also includes a side liquid cooling device, comprising an upper inlet plate and a lower outlet plate, both hollow. The rear sides of the upper inlet plate and lower outlet plate are connected to several evenly spaced heat exchange plates. Each heat exchange plate has a U-shaped flow channel, with the upper and lower ends of the flow channel connected to the upper... The upper liquid inlet plate and the lower liquid outlet plate are connected; the front ends of the upper liquid inlet plate and the lower liquid outlet plate are respectively connected to the liquid cooling channel inlet and liquid cooling channel outlet; a fixing strip is also provided on the rear side of the side liquid cooling device; the fixing strip is fixed to the inner wall of the battery box, and the fixing strip is connected to the rear end of the heat exchange plate through an elastic fixing device; the elastic fixing device includes a fixing frame, the top of the fixing frame is fixedly connected to the fixing strip by bolts, a circular mounting groove is opened in the center of the fixing frame, and a central disk is fixedly connected to the inner wall of the mounting groove by several arc-shaped elastic connecting pieces, wherein the central disk is located in the center of the mounting groove, and the elastic connecting pieces are arranged in a circular array, and a connecting shaft is provided at one end of the central disk, the end of the connecting shaft is fixedly connected to the heat exchange plate by bolts, and a gap is provided between the central disk and the heat exchange plate.

2. The side-bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The side liquid cooling device is integrally formed by extruding profiles into pipes and then welding them together.

3. The side-bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The side liquid cooling device is made of aluminum tube, copper tube, or other metal tube bent and welded.

4. A side-bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The side liquid cooling device is made of non-metallic tubular plastic injection molding.

5. A side-bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The insulating synthetic oil used to immerse the battery module is transformer oil of grade I-10℃.

6. A side-bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The fixing strip is connected to the rear end of the heat exchange plate via an elastic fixing device.

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