Immersed liquid-cooled battery pack

Abstract

The utility model provides an immersed liquid-cooled battery pack which comprises a battery box and a plurality of battery modules arranged in the battery box, a straight flow channel is formed between every two adjacent battery modules at intervals, and a liquid outlet cavity communicated with the straight flow channels is arranged in one end of the battery box in the length direction. A liquid outlet connector communicated with the liquid outlet cavity is arranged on the outer side of one end of the battery box in the length direction, a liquid inlet branch pipe is arranged on the outer side of the other end of the battery box in the length direction, a plurality of liquid distribution pipes are arranged on the liquid inlet branch pipe at intervals, and each liquid distribution pipe is communicated with the straight flow channel. One end of the liquid inlet main pipe is communicated with the liquid inlet branch pipe, and the other end is connected with a liquid inlet interface. According to the battery pack disclosed by the utility model, the liquid inlet main pipe, the liquid inlet branch pipes and the liquid distribution pipes are used for directly distributing the cooling liquid, so that the cooling liquid is ensured to flow along the straight flow channel, a flow channel plate does not need to be arranged in the battery pack, more internal space is released, and the energy density of the battery pack is directly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an immersion liquid-cooled battery pack. Background Art

[0002] With the continuous advancement of battery thermal management technology, the most commonly used thermal management design in current power battery packs and energy storage systems is water-cooled plate cooling. Compared with the air-cooled cooling in the early stage of new energy development, water-cooled plate cooling has improved the cooling performance by about 20% and has better temperature uniformity. The elimination of the air duct required for the air-cooled design makes the overall layout more compact, thereby increasing the energy density of the power battery pack or energy storage system. However, with the increase in charging rate requirements and the increase in cell temperature uniformity requirements, as well as the continuous increase in battery pack energy density requirements, the battery pack generates a lot of heat during the charging and discharging process. The existing water-cooled plate cooling has been difficult to meet the requirements of heat dissipation and temperature uniformity, which not only affects the service life of the battery pack, but may also cause safety accidents.

[0003] As an emerging cooling technology, immersion cooling not only has the advantages of water-cooled plate cooling, but also has better cooling performance and temperature uniformity, and its energy density and cycle life are further improved. In addition, immersion cooling also has a fire-fighting function, which can replace the fire-fighting system of the existing energy storage system and provide higher safety and reliability. Therefore, immersion liquid cooling technology shows great application potential in the field of battery thermal management.

[0004] At present, the immersion liquid-cooled battery pack needs to circulate coolant in the battery pack box during use. Usually, in order to reduce the complexity of the layout of the coolant pipeline on the outside of the battery pack, the inlet and outlet are set on the same side of the battery box. However, setting the inlet and outlet at the same end of the battery pack requires multiple coolant flow plates inside the battery box. The main purpose of these flow plates is to guide the coolant to flow evenly through each battery cell inside the battery pack, and then discharge it through the outlet. Although this design can ensure that the coolant effectively covers all battery cells, it also brings significant disadvantages. The coolant flow plate needs to occupy physical space in the battery box, which directly reduces the space available for placing battery cells. Due to the presence of the flow plate, the overall energy density of the battery pack is reduced, which affects the total capacity and endurance of the battery pack. Utility Model Content

[0005] In view of this, the utility model proposes an immersion liquid-cooled battery pack, which eliminates the use of a flow channel plate through an optimized design, thereby effectively solving the problem that the flow channel plate occupies internal space and causes a reduction in the overall energy density of the battery pack.

[0006] The technical solution of the utility model is achieved in this way:

[0007] The utility model provides an immersion liquid-cooled battery pack, comprising a battery box and a plurality of battery modules arranged in the battery box, a straight flow channel is formed between two adjacent battery modules, a liquid outlet cavity connected to the straight flow channel is arranged inside one end of the battery box in the length direction, a liquid outlet interface connected to the liquid outlet cavity is arranged outside one end of the battery box in the length direction, a liquid inlet branch pipe is arranged outside the other end of the battery box in the length direction, a plurality of liquid distribution pipes are arranged at intervals on the liquid inlet branch pipes, each of the liquid distribution pipes is respectively connected to the straight flow channel, a liquid inlet main pipe is arranged on one side in the width direction of the battery box, one end of the liquid inlet main pipe is connected to the liquid inlet branch pipe, and the other end is connected to the liquid inlet interface, and the liquid inlet interface and the liquid outlet interface are located on the same side of the battery box in the length direction.

[0008] On the basis of the above technical solution, preferably, one end of the battery module away from the liquid outlet cavity is connected to the inner wall of the battery box, and one end of the liquid distribution tube away from the liquid inlet branch pipe penetrates into the battery box and extends into the straight flow channel.

[0009] Furthermore, preferably, a straight flow channel is also provided between the battery module and the inner wall of the adjacent battery box.

[0010] Furthermore, preferably, the diameters of the plurality of liquid distribution pipes gradually increase along the length direction of the liquid inlet branch pipe from an end close to the liquid inlet main pipe to an end far away from the liquid inlet main pipe.

[0011] On the basis of the above technical solution, preferably, three supporting ribs are arranged in parallel at intervals along the length direction of the battery box on the inner bottom surface of the battery box corresponding to the battery module, the bottom surface of the battery module is in contact with the top surface of the supporting ribs, and a liquid cooling cavity is formed between two adjacent supporting ribs and the inner bottom surface of the battery box, a liquid inlet is provided at one end of the liquid cooling cavity close to the liquid distribution tube, and a liquid outlet is provided at the end of the liquid cooling cavity away from the liquid inlet.

[0012] Further, preferably, a plurality of partitions are staggeredly arranged in the liquid cooling chamber, the partitions are vertically connected to the supporting ribs, and the plurality of partitions form a serpentine flow channel in the liquid cooling chamber, one end of the serpentine flow channel is connected to the liquid inlet, and the other end is connected to the liquid outlet, and the liquid outlet is connected to the straight flow channel.

[0013] On the basis of the above technical solution, preferably, the battery module includes a plurality of stacked single cells, an isolating member is arranged between two adjacent single cells, the isolating member includes a first baffle and a second baffle, two first baffles are arranged in parallel, respectively arranged at the top and bottom of the single cell, and the side surface of the first baffle is in contact with the large surface of the single cell, the second baffle is vertically arranged between the two first baffles and located in the middle of the single cell, and the two ends of the second baffle are respectively fixedly connected to the first baffle.

[0014] Preferably, the battery box includes a lower box body and a box cover, the battery module is arranged in the lower box body, the box cover is fixedly arranged at the top opening end of the lower box body, and there is a gap between the top surface of the battery module and the box cover for the coolant flow channel.

[0015] Preferably, the liquid inlet main pipe and the liquid inlet branch pipe are of square structure and are fixedly connected to the outer side wall of the lower box body.

[0016] Preferably, the battery pack further includes an electrical control component, and the electrical control component is located in the liquid outlet cavity.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] (1) By setting the liquid inlet branch pipe at one end of the battery box away from the liquid outlet interface and connecting it to the straight flow channel through multiple liquid distributors, it can be ensured that the coolant can be evenly distributed in the straight flow channel between each battery module, ensuring that each single cell can be effectively cooled. The liquid inlet main pipe is set on one side of the battery box in the width direction and connected to the liquid distributor through the liquid inlet branch pipe. This design allows the liquid inlet interface and the liquid outlet interface to be located at the same end of the battery box. The layout of the coolant pipeline is simplified, the complexity of the pipeline on the outside of the battery pack is reduced, and the convenience of installation and maintenance is improved. Since the coolant is directly distributed using the liquid inlet main pipe, liquid inlet branch pipe and liquid distributor, the coolant can be directly and effectively evenly distributed to the straight flow channel between each battery module, ensuring that the coolant flows along the straight flow channel and is collected in the liquid outlet cavity and discharged from the liquid outlet interface. The flow direction of the coolant is clear. During the entire coolant flow process, there is no need to arrange a flow channel plate in the battery pack, freeing up more internal space, which directly improves the energy density of the battery pack.

[0019] (2) The diameters of the multiple liquid distribution pipes gradually increase along the length of the liquid inlet branch pipe from the end close to the liquid inlet main pipe to the end farthest from the liquid inlet main pipe. This structural setting can compensate for the pressure loss and ensure that the coolant is evenly distributed along the entire length of the liquid inlet branch pipe. The gradually increasing diameter of the liquid distribution pipe helps to balance the flow pressure so that the far end can also get enough coolant flow, thereby ensuring uniform cooling of the entire battery pack. Evenly distributed coolant can more efficiently cover various areas of the battery pack, reduce the risks of local overheating and uneven coolant flow, and improve the reliability and stability of the cooling system.

[0020] (3) By setting parallel support ribs on the bottom surface of the battery box and forming a liquid cooling cavity, and by rationally arranging the liquid inlet and outlet, it is possible to ensure that the bottom surface of the battery module can be covered by the coolant, thereby increasing the contact area between the battery module and the coolant. A serpentine flow channel is formed in the liquid cooling cavity through multiple partitions. This design forces the coolant to flow along a specific path, increasing the contact time and area between the coolant and the bottom of the battery module. The serpentine flow channel ensures that the coolant flows evenly through the entire liquid cooling cavity, thereby achieving uniform heat dissipation and avoiding local overheating.

[0021] (4) An isolator is provided between the single cells, and the isolator has an I-shaped structure. When the isolator is provided between two single cells, a gap is formed between the two single cells. Therefore, when the coolant flows in the straight flow channel, it will flow into the above gap, thereby cooling and dissipating the large surface of the single cell, further improving the heat dissipation efficiency of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the immersion liquid-cooled battery pack disclosed in the utility model;

[0024] Figure 2 It is a schematic diagram of the internal planar structure of the immersion liquid-cooled battery pack disclosed in the utility model;

[0025] Figure 3 It is a structural schematic diagram of the liquid inlet main pipe, liquid inlet branch pipe and liquid distribution pipe disclosed in the utility model;

[0026] Figure 4 This is a schematic diagram of the internal structure of the battery box disclosed in the utility model;

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the battery module disclosed in the utility model;

[0028] Reference numerals:

[0029] 1. Battery box; 2. Battery module; 10. Straight flow channel; 11. Liquid outlet cavity; 12. Liquid outlet interface; 3. Liquid inlet main pipe; 4. Liquid inlet branch pipe; 41. Liquid distribution pipe; 31. Liquid inlet interface; 13. Support ribs; 130. Liquid cooling cavity; 131. Liquid inlet; 132. Liquid outlet; 14. Partition; 141. Serpentine flow channel; 21. Single cell; 22. Isolator; 221. First baffle; 222. Second baffle; 1-1. Lower box body; 1-2. Box cover; 5. Electrical control components. DETAILED DESCRIPTION

[0030] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] like Figure 1 As shown, combined Figure 2-3 The utility model discloses an immersion liquid-cooled battery pack, including a battery box 1 and a plurality of battery modules 2 arranged in the battery box 1, a straight flow channel 10 is formed between two adjacent battery modules 2, in this embodiment, the battery module 2 is formed by a plurality of single battery cells 21 stacked and arranged, and the plurality of battery modules 2 are arranged inside the battery box 1 at intervals along the width direction thereof, and gaps are formed between the battery modules 2 to form the straight flow channel 10, and the arrangement of the straight flow channel 10 simplifies the flow path of the coolant in the battery pack, ensures that the coolant can effectively and evenly flow through each single battery cell 21, and improves the cooling efficiency.

[0032] A liquid outlet cavity 11 connected to the straight flow channel 10 is provided inside one end of the battery box 1 in the length direction, and a liquid outlet interface 12 connected to the liquid outlet cavity 11 is provided outside one end of the battery box 1 in the length direction. According to this arrangement, the coolant flows out of each straight flow channel 10 and is collected in the liquid outlet cavity 11, which simplifies the coolant discharge result and enables the coolant to be quickly and effectively discharged from the liquid outlet interface 12.

[0033] A liquid inlet branch pipe 4 is arranged on the outer side of the other end of the battery box 1 in the length direction, and a plurality of liquid distribution pipes 41 are arranged at intervals on the liquid inlet branch pipe 4, and each of the liquid distribution pipes 41 is respectively connected to the straight flow channel 10. A liquid inlet main pipe 3 is arranged on one side in the width direction of the battery box 1, and one end of the liquid inlet main pipe 3 is connected to the liquid inlet branch pipe 4, and the other end is connected to the liquid inlet interface 31. The liquid inlet interface 31 and the liquid outlet interface 12 are located on the same side of the battery box 1 in the length direction.

[0034] By setting the liquid inlet branch pipe 4 at one end of the battery box 1 away from the liquid outlet interface 12 and connecting it to the straight flow channel 10 through multiple liquid distributors 41, it can be ensured that the coolant can be evenly distributed in the straight flow channel 10 between each battery module 2, ensuring that each single cell 21 can be effectively cooled. The liquid inlet main pipe 3 is set on one side of the battery box 1 in the width direction and connected to the liquid distributor 41 through the liquid inlet branch pipe 4. This design allows the liquid inlet interface 31 and the liquid outlet interface 12 to be located at the same end of the battery box 1. The layout of the coolant pipeline is simplified, the complexity of the pipeline on the outside of the battery pack is reduced, and the convenience of installation and maintenance is improved.

[0035] Since the coolant is directly distributed using the liquid inlet main pipe 3, the liquid inlet branch pipe 4 and the liquid distribution pipe 41, the coolant can be directly and effectively evenly distributed to the straight flow channels 10 between the battery modules 2, ensuring that the coolant flows along the straight flow channels 10 and is collected in the liquid outlet cavity 11 and discharged from the liquid outlet interface 12. The flow direction of the coolant is clear, and during the entire coolant flow process, there is no need to arrange a flow channel plate in the battery pack, thereby releasing more internal space, which directly improves the energy density of the battery pack.

[0036] As some preferred embodiments, one end of the battery module 2 away from the liquid outlet cavity 11 is connected to the inner wall of the battery box 1, and one end of the liquid distribution tube 41 away from the liquid inlet branch pipe 4 penetrates into the battery box 1 and extends into the straight flow channel 10. With this arrangement, the end of the battery module 2 away from the liquid outlet cavity 11 in the length direction is fixedly connected to the inner wall of the battery box 1, so that the straight flow channel 10 is effectively separated, which can ensure that the coolant flows according to the designed flow path, avoiding the problem of uneven cooling caused by the gap between the end of the battery module 2 away from the liquid outlet cavity 11 and the inner wall of the battery box 1, resulting in the coolant flowing into the adjacent flow channel at the liquid inlet end.

[0037] It is worth noting that the coolant involved in this embodiment is made of non-conductive material and is a prior art.

[0038] As some preferred embodiments, a straight channel 10 is also provided between the battery module 2 and the inner wall of the adjacent battery box 1. This structural setting ensures that the coolant flows not only in the straight channel 10 between the battery modules 2, but also in the straight channel 10 between the battery module 2 and the inner wall of the battery box 1, providing a more uniform cooling effect and avoiding local overheating. At the same time, the design of multiple straight channels 10 enhances the flow control of the coolant, ensuring that the coolant can efficiently cover all areas that need to be cooled, so that all single cells 21 can be cooled by the coolant for heat exchange, thereby improving the cooling efficiency.

[0039] Since the coolant is affected by resistance and pressure loss during its flow, the end close to the liquid inlet main pipe 3 usually receives more coolant, while the coolant flow rate at the end away from the liquid inlet main pipe 3 is reduced, resulting in poor cooling uniformity of the battery module 2.

[0040] To this end, the solution adopted in this embodiment is: the diameter of the multiple liquid distribution tubes 41 gradually increases along the length direction of the liquid inlet branch pipe 4 from the end close to the liquid inlet main pipe 3 to the end away from the liquid inlet main pipe 3. By adopting the above technical solution, by designing the diameter of the liquid distribution tube 41 to gradually increase, this pressure loss can be compensated to ensure that the coolant is evenly distributed along the entire length direction of the liquid inlet branch pipe 4. The gradually increasing diameter of the liquid distribution tube 41 helps to balance the flow pressure so that the far end can also obtain sufficient coolant flow, thereby ensuring uniform cooling of the entire battery pack. The evenly distributed coolant can cover various areas of the battery pack more efficiently, reduce the risks of local overheating and uneven coolant flow, and improve the reliability and stability of the cooling system.

[0041] In order to realize cooling and heat dissipation of the bottom surface of the battery module 2, refer to the attached Figure 4 As shown, the solution adopted in this embodiment is: three support ribs 13 are arranged in parallel and at intervals along the length direction of the battery box 1 on the inner bottom surface of the battery box 1 corresponding to the battery module 2, and the bottom surface of the battery module 2 is in contact with the top surface of the support ribs 13. The arrangement of the support ribs 13 can provide mechanical support for the battery module 2. A liquid cooling cavity 130 is formed between two adjacent support ribs 13 and the inner bottom surface of the battery box 1. A liquid inlet 131 connected to the straight flow channel 10 is provided at one end of the liquid cooling cavity 130 close to the liquid distribution pipe 41, and a liquid outlet 132 is provided at one end of the liquid cooling cavity 130 away from the liquid inlet 131.

[0042] By setting up the liquid cooling chamber 130, the cooling liquid can enter the liquid cooling chamber 130 through the liquid inlet 131 during the flow in the straight flow channel 10, and the cooling liquid covers the bottom surface of the battery module 2, thereby dissipating the heat of the bottom surface of the battery module 2. The cooling liquid after heat dissipation is discharged from the liquid outlet 132 and converges into the liquid outlet chamber 11.

[0043] It is worth noting that the three supporting ribs 13 can form two symmetrical liquid cooling cavities, thereby enabling the two liquid cooling cavities to be connected to the adjacent straight flow channels respectively.

[0044] By arranging parallel supporting ribs 13 on the inner bottom surface of the battery box 1 and forming a liquid cooling cavity 130, and rationally arranging the liquid inlet 131 and the liquid outlet 132, it can be ensured that the bottom surface of the battery module 2 can be covered by the coolant, thereby increasing the contact area between the battery module 2 and the coolant, and further improving the heat dissipation efficiency of the battery module 2.

[0045] On the basis of the above scheme, a plurality of partitions 14 are staggeredly arranged in the liquid cooling chamber 130, and the partitions 14 are vertically connected to the supporting ribs 13. The plurality of partitions 14 form a serpentine flow channel 141 in the liquid cooling chamber 130, and one end of the serpentine flow channel 141 is connected to the liquid inlet 131, and the other end is connected to the liquid outlet 132, and the liquid outlet 132 is connected to the liquid outlet chamber 11.

[0046] By adopting the above technical solution, multiple baffles 14 form a serpentine flow channel 141 in the liquid cooling chamber 130. Such a design forces the coolant to flow along a specific path, increasing the contact time and area between the coolant and the bottom of the battery module 2. The serpentine flow channel 141 ensures that the coolant flows evenly through the entire liquid cooling chamber 130, thereby achieving uniform heat dissipation and avoiding local overheating.

[0047] In this embodiment, the battery module 2 is composed of a plurality of stacked single cells 21. Since the large surfaces of the single cells 21 are in contact with each other, when the coolant flows through the straight flow channel 10, it can only dissipate heat on the side surfaces of the single cells 21 in the width direction, and cannot dissipate heat on the large surfaces of the single cells 21, which will result in a decrease in the heat dissipation efficiency of the single cells 21.

[0048] To this end, in this embodiment, a separator 22 is provided between two adjacent single cells 21. Figure 5 As shown, the isolation member 22 includes a first baffle 221 and a second baffle 222. Two first baffles 221 are arranged in parallel, respectively arranged at the top and bottom ends of the single cell 21, and the side surfaces of the first baffles 221 are in contact with the large surfaces of the single cell 21. The second baffle 222 is vertically arranged between the two first baffles 221 and is located in the middle of the single cell 21. Both ends of the second baffle 222 are fixedly connected to the first baffles 221 respectively.

[0049] Thus, the two parallel first baffles 221 and the second baffles 222 are in an I-shaped structure, and when they are arranged between the two single battery cells 21, a gap is formed between the two single battery cells 21. Therefore, when the coolant flows in the straight flow channel 10, it will flow into the above-mentioned gap, thereby cooling and dissipating the large surface of the single battery cell 21, further improving the heat dissipation efficiency of the battery module 2.

[0050] As some preferred embodiments, the battery box 1 includes a lower box body 1-1 and a box cover 1-2, the battery module 2 is arranged in the lower box body 1-1, the box cover 1-2 is fixedly arranged at the top open end of the lower box body 1-1, and there is a gap between the top surface of the battery module 2 and the box cover 1-2 for the coolant flow channel. With this arrangement, when the coolant fills the entire battery box 1, all the battery modules 2 are completely immersed in the coolant, so that the cooling efficiency of the single battery cell 21 is higher.

[0051] In some embodiments, the liquid inlet main pipe 3 and the liquid inlet branch pipe 4 are both configured as round pipes, which are fixed to the outer side of the lower box body 1-1. As another embodiment, the liquid inlet main pipe 3 and the liquid inlet branch pipe 4 are square structures and are fixedly connected to the outer side wall of the lower box body 1-1. Thus, the liquid inlet main pipe 3 and the liquid inlet branch pipe 4 are square structures, which can improve the structural strength after being fixedly connected to the lower box body 1-1, thereby improving the overall structural strength of the battery box 1.

[0052] Preferably, the battery pack also includes an electrical control component 5, and the electrical control component 5 is located in the liquid outlet cavity 11. Although the temperature of the coolant increases after flowing through the battery module 2, it still has a certain cooling capacity and can effectively dissipate the heat of the electrical control component 5. By cooling the electrical control component 5, performance degradation or failure caused by overheating of the electrical control component 5 is avoided. Through the dual use of the coolant, it can not only efficiently dissipate the heat of the battery module 2, but also effectively dissipate the heat of the electrical control component 5, significantly improving the overall heat dissipation efficiency. Placing the electrical control component 5 in the liquid outlet cavity 11 simplifies the system design, reduces the need for additional cooling equipment or pipelines, and reduces the complexity and cost of the system.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An immersion liquid-cooled battery pack, characterized in that: The invention comprises a battery box (1) and a plurality of battery modules (2) arranged in the battery box (1), wherein a straight flow channel (10) is formed between two adjacent battery modules (2), a liquid outlet cavity (11) connected to the straight flow channel (10) is arranged inside one end of the battery box (1) in the length direction, a liquid outlet interface (12) connected to the liquid outlet cavity (11) is arranged outside one end of the battery box (1) in the length direction, a liquid inlet branch pipe (4) is arranged outside the other end of the battery box (1) in the length direction, a plurality of liquid distribution pipes (41) are arranged at intervals on the liquid inlet branch pipe (4), and each of the liquid distribution pipes (41) is respectively connected to the straight flow channel (10), a liquid inlet main pipe (3) is arranged on one side of the battery box (1) in the width direction, one end of the liquid inlet main pipe (3) is connected to the liquid inlet branch pipe (4), and the other end is connected to the liquid inlet interface (31), and the liquid inlet interface (31) and the liquid outlet interface (12) are located on the same side of the battery box (1) in the length direction.

2. The immersion liquid-cooled battery pack according to claim 1, characterized in that: One end of the battery module (2) away from the liquid outlet cavity (11) is connected to the inner wall of the battery box (1), and one end of the liquid distribution tube (41) away from the liquid inlet branch pipe (4) penetrates into the interior of the battery box (1) and extends into the straight flow channel (10).

3. The immersed liquid-cooled battery pack according to claim 2, characterized in that: A straight flow channel (10) is also provided between the battery module (2) and the inner wall of the adjacent battery box (1).

4. The immersion liquid-cooled battery pack according to claim 3, characterized in that: The diameters of the plurality of liquid distribution pipes (41) gradually increase along the length direction of the liquid inlet branch pipe (4) from an end close to the liquid inlet main pipe (3) to an end far from the liquid inlet main pipe (3).

5. The immersion liquid-cooled battery pack according to claim 4, characterized in that: The inner bottom surface of the battery box (1) corresponding to the battery module (2) is provided with three support ribs (13) spaced in parallel along the length direction of the battery box (1); the bottom surface of the battery module (2) is in contact with the top surface of the support ribs (13); two adjacent support ribs (13) and the inner bottom surface of the battery box (1) enclose a liquid cooling cavity (130); an end of the liquid cooling cavity (130) close to the liquid distribution pipe (41) is provided with a liquid inlet (131) connected to the straight flow channel (10); and an end of the liquid cooling cavity (130) away from the liquid inlet (131) is provided with a liquid outlet (132).

6. The immersion liquid-cooled battery pack according to claim 5, characterized in that: A plurality of partitions (14) are arranged in an alternating manner in the liquid cooling chamber (130), the partitions (14) are vertically connected to the supporting ribs (13), and the plurality of partitions (14) form a serpentine flow channel (141) in the liquid cooling chamber (130), one end of the serpentine flow channel (141) is connected to the liquid inlet (131), and the other end is connected to the liquid outlet (132), and the liquid outlet (132) is connected to the liquid outlet chamber (11).

7. The immersion liquid-cooled battery pack according to any one of claims 4 to 6, characterized in that: The battery module (2) comprises a plurality of stacked single cells (21), an isolating member (22) is arranged between two adjacent single cells (21), the isolating member (22) comprises a first baffle (221) and a second baffle (222), two first baffles (221) are arranged in parallel, and are respectively arranged at the top and bottom of the single cell (21), and the side surfaces of the first baffles (221) are in contact with the large surface of the single cell (21), the second baffle (222) is vertically arranged between the two first baffles (221) and is located in the middle of the single cell (21), and the two ends of the second baffle (222) are respectively fixedly connected to the first baffle (221).

8. The submerged liquid-cooled battery pack according to claim 1, characterized in that: The battery box (1) comprises a lower box body (1-1) and a box cover (1-2), the battery module (2) is arranged in the lower box body (1-1), the box cover (1-2) is fixedly arranged at the top open end of the lower box body (1-1), and a gap for a coolant flow channel is provided between the top surface of the battery module (2) and the box cover (1-2).

9. The immersed liquid-cooled battery pack according to claim 8, characterized in that: The liquid inlet main pipe (3) and the liquid inlet branch pipe (4) are of square structure and are fixedly connected to the outer side wall of the lower box body (1-1).

10. The submerged liquid-cooled battery pack according to claim 1, characterized in that: The battery pack further comprises an electrical control component (5), wherein the electrical control component (5) is located in the liquid outlet cavity (11).

Images