An immersion liquid-cooled battery pack with higher heat dissipation efficiency

Abstract

The utility model belongs to battery box technical field, concretely is a kind of more efficient heat dissipation's immersion liquid cooling battery pack, including battery shell, the inside of battery shell is provided with battery pack, the top of battery shell is provided with top cover, and one end of battery shell is provided with circulating cabin, circulating pump is provided in the inside of circulating cabin, and the output of circulating pump is provided with plate heat exchanger, and connecting pipe is provided on the end surface of plate heat exchanger, and connecting pipe is communicated with the inside of battery shell, and the inside of battery shell is provided with cooling immersion liquid, the utility model discloses through setting fixed tooth block and sliding tooth block, it has solved the immersion liquid in the process of transportation in prior art to immerse in the bottom of battery pack first, resulting in the electrode that first heats up last heat dissipation, and the problem of poor heat dissipation effect, through setting circulating pump and plate heat exchanger and other mechanisms, it has solved the problem that when single pack leaks, pollutant spreads to whole system through shared coolant, and maintenance cost increases.

Description

Technical Field

[0001] This utility model belongs to the field of battery box technology, and in particular relates to an immersion liquid-cooled battery pack with more efficient heat dissipation. Background Technology

[0002] Battery packs are used in various new energy scenarios such as electric vehicles and energy storage power stations. Battery immersion cooling technology has significant advantages over traditional thermal management technology in terms of temperature control performance and energy efficiency. Battery modules generate heat during charging and discharging. Excessive temperature and uneven local temperature within the battery can severely reduce battery life. The heat dissipation performance of the battery module is an important factor affecting battery performance, efficiency, lifespan and safety.

[0003] Patent CN219534652U discloses an immersion-type high-efficiency liquid-cooled heat exchange battery pack structure, belonging to the field of battery technology, and includes: a housing with an internal cavity; a battery cell disposed within the cavity; a liquid-cooling plate disposed on the inner side of the housing, with the bottom wall of the battery cell abutting against the liquid-cooling plate; and a heat-conducting plate covering the side wall of the battery cell, one end of the heat-conducting plate abutting against the liquid-cooling plate. The immersion-type high-efficiency liquid-cooled heat exchange battery pack structure provided by this utility model allows the liquid-cooling plate to dissipate heat from the bottom of the battery cell, and the heat-conducting plate covering the side wall of the battery cell to absorb heat from the side wall. Heat is conducted through the heat-conducting plate to the liquid-cooling plate and absorbed by the liquid-cooling plate. This achieves efficient immersion-type heat dissipation of the battery cell, thereby improving the heat exchange efficiency and temperature uniformity between the battery cell and the liquid-cooling plate.

[0004] In existing technologies, liquid cooling plates can dissipate heat from the bottom of the battery cell, but the following problems still exist in overall use: First, existing battery pack cooling technologies cool the battery pack by immersion liquid. During the heat dissipation process, the electrodes connect multiple battery packs for transport, resulting in a rapid heat generation rate. In existing immersion liquids, the bottom of the battery pack is immersed first during transport, causing the electrodes that heat up first to dissipate heat last, resulting in poor heat dissipation effect. Second, in existing technologies, multiple battery packs share a liquid pump to drive the coolant circulation and achieve heat dissipation through centralized pipelines. When a single pack leaks, contaminants spread to the entire system through the shared coolant, increasing maintenance costs. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this invention provides a more efficient immersion liquid-cooled battery pack. By setting up mechanisms such as fixed tooth blocks and sliding tooth blocks, it solves the problem that in existing systems, the immersion liquid is preferentially immersed before the bottom of the battery pack during transportation, resulting in the electrodes that heat up first being the last to dissipate heat, leading to poor heat dissipation. By setting up mechanisms such as circulating pumps and plate heat exchangers, the immersion liquid in each battery pack can be circulated separately, solving the problem that when a single pack leaks, contaminants spread to the entire system through shared coolant, increasing maintenance costs.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a more efficient heat dissipation immersion liquid-cooled battery pack, comprising a battery housing, a battery pack disposed inside the battery housing, a top cover disposed on the top of the battery housing, a circulation chamber disposed at one end of the battery housing, a circulation pump disposed inside the circulation chamber, the input end of the circulation pump communicating with the interior of the battery housing, a plate heat exchanger disposed at the output end of the circulation pump, a connecting pipe disposed on the end face of the plate heat exchanger, the connecting pipe communicating with the interior of the battery housing, a cooling immersion liquid filling the interior of the battery housing, and sliding tooth blocks slidably disposed inside the battery housing.

[0007] Preferably, the battery casing has a flow divider chamber inside, which is connected to a connecting pipe. The flow divider chamber has a cavity inside, and the bottom end face of the flow divider chamber has two first flow channels. A second flow channel is provided between the two first flow channels, and the outer surfaces of the first flow channels and the second flow channels are provided with water outlets.

[0008] Preferably, an inclined plate is provided between the two first flow channels and the second flow channel, and a plurality of drainage holes are provided on the inclined surface of the inclined plate.

[0009] Preferably, the battery casing has a fixing tooth block inside, the fixing tooth block is a toothed strip shape, the fixing tooth block is installed between the battery packs, and the fixing tooth block can engage with the sliding tooth block.

[0010] Preferably, the bottom end face of the fixed tooth block is provided with multiple limiting rods, and the multiple limiting rods are slidably connected to the sliding tooth block. The bottom end face of the sliding tooth block is provided with multiple elastic elements, and one bottom end of the multiple elastic elements is fixedly connected to the inner wall of the battery casing. The outer surface of the sliding tooth block is provided with multiple pressure relief holes.

[0011] Preferably, the battery casing has multiple bottom supports inside, each bottom end face of which has multiple grooves, and each top end face of which has multiple protruding particles, which abut against the battery pack.

[0012] Preferably, the output end of the circulating pump is equipped with a detection device capable of detecting the cooling immersion liquid. A detection chamber is provided on one side of the detection device, a temperature sensor is provided inside the detection chamber, and a pressure sensor is provided on one side of the temperature sensor. The detection chamber is connected to the inlet end of the plate heat exchanger through a water pipe.

[0013] Preferably, the bottom end face of the battery casing is provided with a plurality of PTC heaters capable of electric heating.

[0014] In summary, compared with existing technologies, the beneficial effects of this solution are as follows: (1) By setting fixed tooth blocks and sliding tooth blocks, as well as diversion chambers and first flow channels, this utility model can spray the immersion liquid from the middle section and both sides of the battery casing downwards when the immersion liquid is input. The sprayed immersion liquid can dissipate heat on the battery pack. The immersion efficiency of the immersion liquid can be improved through multiple drain holes, which can further improve the heat dissipation effect. At the same time, by setting fixed tooth blocks and sliding tooth blocks, the immersion liquid can first immerse the top of the battery pack and dissipate heat on the electrode first. The immersion liquid cooling area is reasonably allocated to improve the cooling effect. (2) By setting up a circulating pump, a plate heat exchanger, a detection chamber, and a bottom support, this utility model enables the immersion liquid in a single battery pack to circulate separately and cool the immersion liquid, thereby improving the heat dissipation effect and preventing the immersion liquid in multiple battery packs from being contaminated. At the same time, by setting up a bottom support and protruding particles, the battery pack can be raised to a certain height, so that the coolant flows from the bottom, thereby cooling the bottom end face of the battery pack and improving the cooling effect. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a structural schematic diagram of a battery casing component; Figure 3 This is a side view of the present invention; Figure 4 for Figure 3 A three-dimensional sectional view at point AA; Figure 5 for Figure 2 A magnified view of a section at point B in the middle; In the diagram: battery casing 10, top cover 11, circulation chamber 12, circulation pump 13, detection device 14, temperature sensor 15, pressure sensor 16, detection chamber 17, plate heat exchanger 18, external inlet 19, external outlet 20, connecting pipe 21, diversion chamber 22, first flow channel 23, inclined plate 24, second flow channel 25, drain hole 26, bottom support 27, protruding particles 28, groove 29, PTC heater 30, fixed tooth block 31, sliding tooth block 32, elastic element 33, limiting rod 34. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] refer to Figure 1 and Figure 2 A more efficient heat dissipation immersion liquid-cooled battery pack includes a battery housing 10, inside which a battery pack is housed. A top cover 11 is provided on the top of the battery housing 10. A circulation chamber 12 is provided at one end of the battery housing 10, and a circulation pump 13 is provided inside the circulation chamber 12. The input end of the circulation pump 13 is connected to the interior of the battery housing 10, and a plate heat exchanger 18 is provided at the output end of the circulation pump 13. A connecting pipe 21 is provided on the end face of the plate heat exchanger 18, and the connecting pipe 21 is connected to the interior of the battery housing 10. The battery casing 10 is filled with cooling immersion fluid. The output end of the circulating pump 13 is equipped with a detection device 14 that can detect the cooling immersion fluid. A detection chamber 17 is provided on one side of the detection device 14. A temperature sensor 15 is provided inside the detection chamber 17. A pressure sensor 16 is provided on one side of the temperature sensor 15. The detection chamber 17 is connected to the inlet end of the plate heat exchanger 18 through a water pipe. When cooling the immersion fluid, the circulating pump 13 is started. The output end of the circulating pump 13 draws the immersion fluid inside the battery casing 10 and transports the immersion fluid into the plate heat exchanger 18.

[0018] During the transport process, the detection device 14 can detect the purity of the immersion liquid to determine whether the battery pack is leaking. If a leak is detected, the circulation of a single battery is shut down immediately, and an alarm is sent to the control terminal for maintenance. The immersion liquid flows into the detection chamber 17 through the detection device 14. The temperature of the immersion liquid is monitored by the temperature sensor 15 to facilitate temperature control. The pressure of the immersion liquid is detected by the pressure sensor 16 to detect whether the battery casing 10 is leaking, thereby improving the overall stability of the device. At the same time, the plate heat exchanger 18 is started to dissipate heat from the immersion liquid. Finally, the liquid is returned to the battery casing 10 through the connecting pipe 21.

[0019] Further reference Figure 2 , Figure 3 and Figure 4 The bottom end face of the battery casing 10 is equipped with multiple PTC heaters 30 capable of electric heating. When the temperature sensor 15 detects that the temperature is too low, to prevent the immersion liquid from freezing in cold environments, the PTC heaters 30 are activated to heat the immersion liquid inside the battery casing 10, thereby improving the flow efficiency of the immersion liquid. When the internal temperature of the battery casing 10 is high, the PTC heaters 30 are turned off, and the cooling system is activated to cool down the heated immersion liquid and the battery pack. The outer surface of the plate heat exchanger 18 is provided with an external inlet 19, and an external outlet 20 is provided below the external inlet 19. By setting the external inlet 19 and the external outlet 20, the external immersion liquid can be connected in parallel with the immersion liquid inside the battery casing 10, thereby replacing or outputting the immersion liquid to the outside. The immersion liquid is cooled by an external device, thereby improving the overall flexibility of the device.

[0020] Further reference Figure 2 , Figure 3 and Figure 4 Traditional cooling technology delivers immersion liquid into the battery casing 10 from both sides, but this method is inefficient. To improve delivery efficiency and increase the fluidity of the immersion liquid, a diversion chamber 22 is provided inside the battery casing 10. The diversion chamber 22 is connected to the connecting pipe 21. The diversion chamber 22 has a cavity inside for delivering the immersion liquid. Two first flow channels 23 are provided on the bottom end face of the diversion chamber 22, and a second flow channel 25 is provided between the two first flow channels 23. The outer surfaces of both the first flow channels 23 and the second flow channel 25 are provided with outlets. The water inlet, by adding a second flow channel 25, can spray from the middle, so that the battery pack in the middle can also be sprayed with immersion liquid for cooling, thereby improving the heat dissipation effect. At the same time, an inclined plate 24 is set between the two first flow channels 23 and the second flow channel 25. Multiple drainage holes 26 are set on the inclined surface of the inclined plate 24. By setting the inclined plate 24, the immersion liquid inside the diversion chamber 22 can flow towards the middle and flow out through the drainage holes 26, so as to evenly spray the battery pack for cooling. The multi-hole design improves the delivery efficiency.

[0021] Further reference Figure 2 , Figure 3 , Figure 4 and Figure 5The battery casing 10 has a sliding toothed block 32 and a fixed toothed block 31 inside. Both the sliding toothed block 32 and the fixed toothed block 31 are toothed elongated strips. The fixed toothed block 31 is installed between the battery packs and can engage with the sliding toothed block 32. The bottom end face of the fixed toothed block 31 is provided with multiple limiting rods 34. By setting the limiting rods 34, the sliding direction of the sliding toothed block 32 can be restricted to prevent the sliding toothed block 32 from jamming and improve the overall stability of the device. The multiple limiting rods 34 are slidably connected to the sliding toothed block 32. The bottom end face of the sliding toothed block 32 is provided with multiple elastic elements 33. One end of the bottom of the multiple elastic elements 33 is fixedly connected to the inner wall of the battery casing 10. The outer surface of the sliding toothed block 32 is provided with multiple pressure relief holes. The immersion liquid passes through the holes. When the flow chamber 22 is conveyed into the battery housing 10, it is blocked by the fixed tooth block 31 and the sliding tooth block 32. It begins to collect on the end face of the sliding tooth block 32, so that the immersion liquid first contacts the upper part of the battery pack. This arrangement allows the immersion liquid to preferentially dissipate heat to the battery terminals. Some of the immersion liquid flows downward through the pressure relief hole to cool the lower end of the immersion liquid. When the collection of immersion liquid at the top of the sliding tooth block 32 is restricted, the pressure continuously output by the circulation pump 13 will force the immersion liquid to press down on the sliding tooth block 32, causing the sliding tooth block 32 to press down on the elastic member 33, thereby causing the sliding tooth block 32 to disengage from the contact with the fixed tooth block 31. The immersion liquid on the end face of the sliding tooth block 32 flows into the battery housing 10 along the gap between the sliding tooth block 32 and the fixed tooth block 31, thereby dissipating heat to the bottom end face of the battery pack.

[0022] Further reference Figure 2 and Figure 3 The battery casing 10 has multiple bottom supports 27 inside. Each bottom support 27 has multiple grooves 29 on its bottom end face and multiple protruding particles 28 on its top end face. The protruding particles 28 abut against the battery pack. By setting the bottom supports 27 and grooves 29, the battery pack can be raised to a certain height, allowing the immersion liquid to flow from the bottom of the battery pack. The protruding particles 28 reduce the contact area between the bottom supports 27 and the battery pack, allowing the immersion liquid to flow from the gap between the battery pack and the protruding particles 28, ensuring that the battery pack is in full contact with the immersion liquid and improving the heat dissipation effect.

[0023] This utility model discloses a more efficient heat dissipation immersion liquid-cooled battery pack. Its installation and connection methods are all common mechanical methods. The control of the driving component by the detection component and the related detection methods and specific circuit relationships of each detection component can all adopt conventional electrical control technology. As long as the corresponding motion relationship can be completed in this solution and its beneficial effect can be achieved, it can be implemented. The detection device 14, temperature sensor 15, pressure sensor 16, plate heat exchanger 18, circulation pump 13 and other components in this utility model's more efficient heat dissipation immersion liquid-cooled battery pack are all commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0024] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0025] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0026] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A more efficient heat dissipation immersion liquid-cooled battery pack, comprising a battery casing (10), characterized in that, The battery housing (10) is equipped with a battery pack inside. The top of the battery housing (10) is equipped with a top cover (11). One end of the battery housing (10) is equipped with a circulation chamber (12). The circulation chamber (12) is equipped with a circulation pump (13). The input end of the circulation pump (13) is connected to the inside of the battery housing (10). The output end of the circulation pump (13) is equipped with a plate heat exchanger (18). The end face of the plate heat exchanger (18) is equipped with a connecting pipe (21). The connecting pipe (21) is connected to the inside of the battery housing (10). The inside of the battery housing (10) is filled with a cooling immersion liquid. The inside of the battery housing (10) is slidably equipped with a sliding tooth block (32).

2. The immersion liquid-cooled battery pack with more efficient heat dissipation according to claim 1, characterized in that, The battery casing (10) is provided with a flow divider (22) inside. The flow divider (22) is connected to the connecting pipe (21). The flow divider (22) is provided with a cavity inside. The bottom end face of the flow divider (22) is provided with two first flow channels (23). A second flow channel (25) is provided between the two first flow channels (23). The outer surfaces of the first flow channel (23) and the second flow channel (25) are provided with water outlets.

3. The immersion liquid-cooled battery pack with more efficient heat dissipation according to claim 2, characterized in that, An inclined plate (24) is provided between the two first flow channels (23) and the second flow channel (25), and a plurality of drainage holes (26) are provided on the inclined surface of the inclined plate (24).

4. The immersion liquid-cooled battery pack with more efficient heat dissipation according to claim 1, characterized in that, The battery casing (10) is provided with a fixing tooth block (31) inside. The fixing tooth block (31) is a toothed strip shape. The fixing tooth block (31) is installed between the battery packs. The fixing tooth block (31) can engage with the sliding tooth block (32).

5. A more efficient heat dissipation immersion liquid-cooled battery pack according to claim 4, characterized in that, The bottom end face of the fixed tooth block (31) is provided with a plurality of limiting rods (34), and the plurality of limiting rods (34) are slidably connected to the sliding tooth block (32). The bottom end face of the sliding tooth block (32) is provided with a plurality of elastic elements (33), and one bottom end of the plurality of elastic elements (33) is fixedly connected to the inner wall of the battery casing (10). The outer surface of the sliding tooth block (32) is provided with a plurality of pressure relief holes.

6. A more efficient heat dissipation immersion liquid-cooled battery pack according to claim 1, characterized in that, The battery housing (10) has multiple bottom supports (27) inside. The bottom end face of each of the multiple bottom supports (27) is provided with multiple grooves (29), and the top end face of each of the multiple bottom supports (27) is provided with multiple protruding particles (28). The multiple protruding particles (28) abut against the battery pack.

7. A more efficient heat dissipation immersion liquid-cooled battery pack according to claim 1, characterized in that, The output end of the circulating pump (13) is equipped with a detection device (14) capable of detecting the cooling immersion liquid. A detection chamber (17) is provided on one side of the detection device (14). A temperature sensor (15) is provided inside the detection chamber (17). A pressure sensor (16) is provided on one side of the temperature sensor (15). The detection chamber (17) is connected to the inlet end of the plate heat exchanger (18) through a water pipe.

8. A more efficient heat dissipation immersion liquid-cooled battery pack according to claim 1, characterized in that, The bottom end face of the battery casing (10) is provided with a plurality of PTC heaters (30) capable of electric heating.

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