Side-top double-channel liquid-cooled immersed battery box

Abstract

The invention discloses a liquid-cooled immersed battery box with two channels on the side surface and the top, which is based on the fact that a battery cell module is directly immersed in synthetic oil, so that a heating source battery cell, an aluminum row and the like are directly and fully contacted with the synthetic oil, the heat dissipation is more uniform and efficient, the temperature gradient of a battery can be effectively reduced, and the local overheating phenomenon is reduced. The main heat dissipation mode is a novel cooling scheme that heat is conducted into synthetic oil through a battery cell aluminum row and the like, and then heat in the synthetic oil is taken away. Compared with a traditional liquid cooling battery box, namely, a mode of only utilizing a bottom cooling water channel or a liquid cooling plate for cooling, the liquid cooling battery box has the advantages of more obvious temperature uniformity and direct and efficient cooling, and due to the fact that contact conduction has a larger contact surface area, heat exchange can be carried out more efficiently, the problem of the pain point that the head of a battery cell is hot and the foot of the battery cell is cold in traditional liquid cooling is solved, and the service life of the battery cell is prolonged. And the service life of the battery cell is prolonged. And compared with a cooling circulation dynamic oil scheme, the scheme is simple in sequence design, lower in cost and higher in reliability.

Description

Technical Field

[0001] This invention relates to the field of battery boxes, specifically a side-top 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 box structures typically use cooling channels or liquid cooling plates 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 box, shortening battery life, and potentially posing safety hazards.

[0003] Existing technical issues:

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

[0005] The battery box has low cooling efficiency, and the battery operates within a small temperature range.

[0006] 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 battery box as a whole.

[0007] The existing battery boxes suffer from uneven temperature distribution within the modules, leading to localized overheating, which is detrimental to the long-term use of the battery system and compromises its safety and reliability. The cooling efficiency of the battery boxes is low, resulting in a narrow operating temperature range for the batteries. Liquid-cooled battery boxes on the market only dissipate heat through a bottom liquid cooling plate, leaving the cell terminals and aluminum busbars at excessively high temperatures, which are the main heat sources. This causes a large temperature difference between the top and bottom of the battery box and affects the consistency of ion movement within the battery, thus impacting charging and discharging efficiency and battery consistency. Existing immersion battery boxes, which rely on oil circulation for cooling, have numerous drawbacks. For example, the varying fluidity of the immersion liquid at different temperatures leads to significant pressure variations in the circulation pipeline; temperature inconsistencies vary greatly between different locations or areas; the circulation oil path is complex; and issues with the compatibility of seals and the inherent properties of materials pose a risk of oil leakage, making after-sales service difficult and costly. Furthermore, the equipment for circulating cooling oil is more expensive and has low volumetric and mass energy density.

[0008] Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. Summary of the Invention

[0009] The purpose of this invention is to provide a side-top dual-channel liquid-cooled immersion battery box to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A dual-channel liquid-cooled immersion battery box with side and top cooling includes a battery box; a battery module is disposed inside the cavity of the battery box and is immersed in an immersion liquid; the battery module is also provided with a side liquid cooling device located on both sides of the battery module; the battery module is also provided with a top liquid cooling device, which is fixedly mounted on an insulating sheet at the top and is located above the insulating sheet. The top liquid cooling device is hollow inside and has a top cooling inlet and a top cooling outlet connected to its two ends; both the top cooling inlet and the top cooling outlet are located at the front end of the battery box.

[0012] Furthermore, the battery module is provided with several sets, and the side liquid cooling device is provided with several sets, wherein the side liquid cooling device located on the inner side is used for liquid inlet, and the side liquid cooling devices located on both sides are used for liquid return.

[0013] Furthermore, the side liquid cooling device is formed by extruding profiles into pipes and then welding them together, or by stamping sheet metal and then welding them together.

[0014] Furthermore, the side liquid cooling device is made of aluminum tubes, copper tubes, or other metal tubes that are bent and welded, or non-metallic tubes.

[0015] Furthermore, the side liquid cooling device is made of plastic injection molding or extrusion molding.

[0016] Furthermore, the inflection point of the top liquid cooling device is fixed to the inner wall of the battery box by an elastic fastener.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The dual-channel liquid cooling solution ensures that the battery cell is in a temperature range that is more favorable to its performance. Even with multiple continuous charge and discharge cycles, the temperature rise and maximum temperature are still significantly better than current liquid cooling methods, greatly reducing the probability of thermal runaway of the battery cell from the source. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a side-top dual-channel liquid-cooled immersion battery box (after removing the top cover).

[0020] Figure 2 This is a front view of a dual-channel liquid-cooled immersion battery box with a side and top.

[0021] Figure 3 for Figure 2 Sectional view along the AA direction.

[0022] Figure 4 for Figure 1 A schematic diagram of the structure after removing the battery module.

[0023] Figure 5 This is a partial structural diagram of the side liquid cooling device.

[0024] Figure 6 This is a partial structural diagram of the top liquid cooling device.

[0025] Figure 7 for Figure 4 A schematic diagram of a structure with elastic fasteners.

[0026] Figure 8 This is a schematic diagram of the structure of an elastic fastener.

[0027] Figure 9 This is an exploded view of the elastic fastener. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-8 A side-top dual-channel liquid-cooled immersion battery box includes a battery box 1; a battery module 2 is disposed inside the inner cavity of the battery box 1, and the battery module 2 is immersed in an immersion liquid; the immersion liquid is insulating heat-conducting oil.

[0030] It also includes a side liquid cooling device 3, which is located on both sides of the battery module 2. In this solution, the battery module 2 is provided with four sets of side liquid cooling devices and five sets of side liquid cooling devices 3. The three sets of side liquid cooling devices 3 located on the inner side are for liquid inlet, and the two sets of side liquid cooling devices 3 located on the outer side are for liquid return.

[0031] The side liquid cooling device 3 includes three parallel hollow pipes 301 and primary distribution pipes 302 located at both ends of the hollow pipes 301. The primary distribution pipes 302 are hollow, and the ends of the hollow pipes 301 are connected to the primary distribution pipes 302. At the same time, the top of the primary distribution pipes 302 is connected to a bend 303.

[0032] The side liquid cooling device also includes a rear main pipe 4, a front liquid inlet main pipe 5 and a front liquid return main pipe 6. The bends 303 at the rear end of the five sets of side liquid cooling devices 3 are connected to the rear main pipe 4, wherein the rear main pipe 4 is located on the outside of the rear end of the battery box 1.

[0033] Both the front liquid inlet manifold 5 and the front liquid return manifold 6 are located on the front outer side of the battery box 1. The bends 303 at the front of the three inner side liquid cooling devices 3 are connected to the front liquid inlet manifold 5. The bends 303 at the outer side liquid cooling devices 3 are connected to the front liquid return manifold 6.

[0034] In this scheme, the front-end liquid inlet manifold 5 and the front-end liquid return manifold 6 are respectively connected to a liquid inlet 501 and a liquid return outlet 601;

[0035] Coolant enters the front inlet manifold 5 from the inlet 501. The coolant in the front inlet manifold 5 enters the middle three sets of side liquid cooling devices 3, then enters the rear manifold 4, and finally enters the front return manifold 6 from the side liquid cooling devices 3 on both sides and is discharged from the return port 601.

[0036] The advantage of this scheme is that the coolant temperature of the three sets of side liquid cooling devices 3 that enter the inner side first is lower, while the temperature in the middle of the battery box 1 is higher, and its heat exchange efficiency is higher; the coolant that returns last passes through the side liquid cooling devices 3 on both sides to return to the liquid.

[0037] The side liquid cooling device 3 is formed by extruding profiles into pipes and then welding them together, or by stamping sheet metal and then welding them together. It can also be replaced by bending and welding other metal pipes such as aluminum pipes and copper pipes, or non-metallic pipes.

[0038] If it is a non-metallic tube, it can be made of plastic injection molding or extrusion molding.

[0039] It also includes a top liquid cooling device 7. The top of the battery module 2 is fixedly installed on the insulating sheet 8. The top liquid cooling device 7 is located above the insulating sheet 8. The top liquid cooling device 7 is serpentine in shape and hollow inside. The two ends of the top liquid cooling device 7 are respectively connected to the top cooling inlet 701 and the top cooling outlet 702. The top cooling inlet 701 and the top cooling outlet 702 are both located at the front end of the battery box 1.

[0040] The installation and fixing method of the side liquid cooling device in this solution is as follows: First, install the battery module 2 inside the battery box 1, then install the side liquid cooling device 3 on the side of the battery module 2. Repeat this step. After fixing the battery module 2 and the side liquid cooling device, connect and splice the side liquid cooling device 3 and fix it with screws and sealing rings to prevent loosening and ensure the overall sealing of the battery box. Finally, structural adhesive can also be used for further fixing to ensure the firmness of the liquid cooling device.

[0041] It is worth noting that the laying method in this solution is only for the purpose of describing the present invention and should not be construed as a limitation of the present invention. For example, the side liquid cooling device can also be installed first and then the battery module can be installed.

[0042] Secondly, the top liquid cooling unit needs to be installed. After the side liquid cooling unit is installed, an insulating sheet 8 should be added and fixed on top of the module. Then, the top liquid cooling unit 7 should be laid flat on top of the insulating sheet, mainly along both sides of the cell pressure relief hole, and the path should be away from the top of conductive materials such as aluminum busbars. This can enhance the insulation performance and ensure electrical safety. Then, use nuts and sealing rings to connect the water inlet and outlet channels to the top cooling inlet 701 and top cooling outlet 702 respectively after passing through the corresponding holes in the box, to ensure the overall sealing of the box. The top liquid cooling unit can be bound to the insulating sheet and end plate with cable ties or structural adhesive at the part that avoids the conductive materials to ensure that the side liquid cooling unit does not loosen.

[0043] When this solution is used, the external coolant enters through the three inlet channels 3 between the four battery modules 2, then gathers at the rear of the battery box 1, and then returns through the inlet channels 3 near the sides of the box. The immersion liquid is cooled by the side liquid cooling device 3 set on the side of the solution, so that the heat generated by the battery cells is cooled by heat exchange with the cooling system.

[0044] The other part of the external coolant enters the top liquid cooling device 7 from the top cooling inlet 701 and finally exits from the top cooling outlet 702;

[0045] The battery module 2 is cooled by the simultaneous cooling of the side liquid cooling device and the top liquid cooling device 7, so that the heat generated by the battery cells is cooled down by heat exchange with the cooling system.

[0046] This invention enables cooling across all modules, allowing for thorough and efficient heat exchange and cooling of the immersion fluid. This improves overall cooling performance, extends battery life, and enhances safety.

[0047] In some embodiments of this solution, considering that the immersion liquid is heated when the battery module 2 is operating, and the immersion liquid heats the top liquid cooling device 7, since this heating is not uniform, the heat exchange plate 203 will generate thermal stress due to uneven heating, causing the plate to deform. Moreover, since the top liquid cooling device 7 is serpentine, this deformation will be amplified. If cable ties or structural adhesive are used for fixing, the fixing points are prone to breakage after repeated startups of the battery module 2.

[0048] like Figure 7-9 As shown, in this solution, the inflection point of the top liquid cooling device 7 is fixed to the inner wall of the battery box 1 by an elastic fastener 703.

[0049] The elastic fastener 703 includes a pipe connection part 704, a torsion part 705, and a vertical fixing part 706. In this design, the pipe connection part 704 is an arc shape that fits the inflection point of the top liquid cooling device 7, and the cross-section of the pipe connection part 704 is circular. At the same time, the rear end of the pipe connection part 704 extends horizontally to the rear side to provide a torsion part 705, wherein the middle part of the torsion part 705 is twisted by ninety degrees so that the end of the torsion part 705 is vertically set. The end of the torsion part 705 continues to extend rearward to provide a vertical fixing part 706. The vertical fixing part 706 is fixedly connected to the connecting lug 707 (welded and fixed to the inner wall of the battery box 1) on the inner wall of the battery box 1 by bolts.

[0050] That is, Figure 9 As shown, in this design, the rear end of the pipe connection 704 is provided with a break 708, and a torsion part 705 and a vertical fixing part 706 are provided extending rearward from the break 708. The elastic fixing member 703 is made of spring steel sheet.

[0051] During installation, the elastic fastener 703 can be pried open from its rear end, and then fitted onto the inflection point of the top liquid cooling device 7.

[0052] In this solution, the top liquid cooling device 7 is connected by an elastic fastener 703. Therefore, the deformation of the top liquid cooling device 7 will be absorbed by the elastic fastener 703, thus ensuring that the top liquid cooling device 7 can always be supported.

[0053] Because of the presence of the torsion part 705 in this design, the torsion part 705 can deform accordingly regardless of whether the top liquid cooling device 7 is displaced in the left-right direction or in the vertical direction, thereby absorbing the stress generated by these deformations. This ensures that the top liquid cooling device 7 is always fixed.

[0054] To absorb displacement in the front-to-back direction, the vertical fixing part 706 has a waist hole 710 along the front-to-back direction. At the same time, rectangular guide blocks 709 are provided on the left and right sides of the connecting ear 707. The guide blocks 709 are located in the waist hole 710, and the bolt passes through the guide blocks 709 to prevent the vertical fixing part 706 from disengaging from the connecting ear 707.

[0055] 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- and top-dual-channel liquid-cooled immersion battery case, comprising a battery case; characterized in that, The battery box contains a battery module inside its cavity, which is immersed in an immersion liquid. It also includes a side liquid cooling device located on both sides of the battery module. Furthermore, it includes a top liquid cooling device, which is fixedly mounted on an insulating sheet at the top of the battery module. The top liquid cooling device is located above the insulating sheet and is hollow inside. Both ends of the top liquid cooling device are connected to a top cooling inlet and a top cooling outlet, respectively. Both the top cooling inlet and the top cooling outlet are located at the front end of the battery box.

2. The side-top dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The battery module is provided in several groups, and the side liquid cooling device is provided in several groups, wherein the side liquid cooling device located on the inner side is used for liquid inlet, and the side liquid cooling devices located on both sides are used for liquid return.

3. The side-top dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The side liquid cooling device is formed by extruding profiles into pipes and then welding them together, or by stamping sheet metal and then welding them together.

4. A side-top dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The side liquid cooling device is made of aluminum tubes, copper tubes, or other metal tubes that have been bent and welded, or non-metallic tubes.

5. A side-top dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The side liquid cooling device is made of plastic injection molding or extrusion molding.

6. A side-top dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, The inflection point of the top liquid cooling device is fixed to the inner wall of the battery box by an elastic fastener.

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