Immersed liquid-cooled battery pack and electric vehicle

Abstract

The utility model discloses an immersed liquid-cooled battery pack. The immersed liquid-cooled battery pack comprises a battery pack shell, a battery module and insulating oil, the battery pack shell is provided with an oil injection port, and is provided with a module accommodating cavity as well as a bottom plate, a circumferential side wall and a top cover which are enclosed to form the module accommodating cavity; the at least one battery module is arranged in the module accommodating cavity; the battery module comprises a module shell and a single battery arranged in the module shell; the module accommodating cavity is filled with the insulating oil, and the insulating oil is configured to immerse the single batteries; a liquid cooling channel is arranged in the bottom plate, the battery pack shell is provided with a liquid inlet and a liquid outlet which are communicated with the liquid cooling channel, and the liquid inlet and the liquid outlet are connected with a circulating pipeline. The bottom plate of the immersed liquid-cooled battery pack is provided with the liquid-cooled channel, the non-flowing insulating oil is in full contact with the single batteries in the battery pack and exchanges heat with the single batteries, and the heat exchange medium in the liquid-cooled channel exchanges heat with the battery pack, the battery module and the insulating oil, so that the temperature rise and the temperature difference of the battery pack are controlled.

Description

Technical Field

[0001] The utility model relates to the field of battery pack heat dissipation structures, and in particular to an immersion liquid-cooled battery pack and an electric vehicle. Background Art

[0002] Traditional heat dissipation methods for battery packs mainly include air cooling and liquid cooling plates. Fast charging is one of the key requirements for new energy electric vehicles. At present, the charging rate of battery packs has evolved from the original 2-3C to 4-6C. The single liquid cooling method is increasingly unable to meet the needs of fast charging.

[0003] The improved technical solution is to immerse the single battery in insulating oil and use the oil return path outside the battery pack to force the insulating oil in the battery pack to flow. The heat exchange area between the insulating oil and the battery is large and the heat transfer efficiency is high, but the fluid in the dead zone of the flow in the battery pack basically does not participate in the main fluid flow, which further increases the temperature difference of the insulating oil temperature field inside the battery pack. The corresponding solution is usually to adaptively modify the thermal management heat exchange components of the whole vehicle, which increases the difficulty of vehicle model adaptation and project implementation. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects existing in the prior art and provide an immersion liquid-cooled battery pack. By combining immersion heat exchange and liquid cooling channel heat exchange, and the liquid cooling channel is arranged on the bottom plate, the insulating oil inside the battery pack is relatively static when the battery pack is in use, thereby reducing the temperature difference of the insulating oil temperature field inside the battery pack.

[0005] In order to achieve the above technical effects, the technical solution of the utility model is: an immersion liquid-cooled battery pack, comprising:

[0006] A battery pack housing is provided with an oil filling port, and has a module accommodating cavity and a bottom plate, a circumferential side wall and a top cover enclosing and forming the module accommodating cavity;

[0007] A battery module, at least one and disposed in the module accommodating cavity, comprising a module housing and a single battery disposed in the module housing;

[0008] Insulating oil, filling the module accommodating cavity and submerging the single battery;

[0009] A liquid cooling channel is provided in the bottom plate, and the battery pack shell is provided with a liquid inlet and a liquid outlet communicated with the liquid cooling channel, and the liquid inlet and the liquid outlet are connected to a circulation pipeline.

[0010] A preferred technical solution is that the module shell is in heat exchange contact with at least the bottom plate of the battery pack shell.

[0011] A preferred technical solution is that the number of the liquid cooling channels is at least two, and the liquid cooling channels are arranged in parallel.

[0012] A preferred technical solution is that the circumferential side wall has a first side wall and a second side wall that are opposite to each other in a first direction, the liquid inlet is arranged on the first side wall, and the liquid outlet is arranged on the second side wall.

[0013] A preferred technical solution is that the base plate includes a liquid cooling plate and a first reinforcing beam, the liquid cooling channel is arranged in the liquid cooling plate, the first reinforcing beam is sealed between the liquid cooling plates arranged side by side, and the first reinforcing beam divides the module accommodating cavity into at least two module accommodating spaces.

[0014] A preferred technical solution is that a second reinforcing beam is provided in the module accommodating cavity, the second reinforcing beam is fixedly connected to the bottom plate and / or the side wall, and the second reinforcing beam divides the module accommodating cavity into at least two module accommodating spaces.

[0015] A preferred technical solution is that the module housing has a heat dissipation channel, and the heat dissipation channel connects the internal space and the external space of the module housing.

[0016] A preferred technical solution is that the liquid cooling channel extends in a straight line and is connected between the first side wall and the second side wall.

[0017] Furthermore, the liquid cooling channels are arranged side by side along a second direction, the first direction and the second direction are perpendicular to each other, and the liquid inlet and the liquid outlet are both arranged at a central position of the liquid cooling channel arrangement area in the second direction.

[0018] A preferred technical solution is that the first side wall is provided with connected branch channels and tributary channels, the second side wall is provided with connected converging channels and tributary channels, the tributary channels are connected to the liquid cooling channel; the liquid inlet is connected to the branch channel, and the liquid outlet is connected to the converging channel.

[0019] A second object of the present utility model is to provide an electric vehicle, characterized in that it includes the above-mentioned immersion liquid-cooled battery pack.

[0020] The advantages and beneficial effects of the utility model are:

[0021] The bottom plate of the utility model immersion liquid-cooled battery pack is provided with a liquid cooling channel, and the non-flowing insulating oil is in full contact with the single battery in the battery pack and exchanges heat. The heat exchange medium in the liquid cooling channel and the battery pack can exchange heat with the battery module and the insulating oil, avoiding the problem of local temperature rise caused by the dead zone of insulating oil flow in the battery pack, thereby controlling the temperature rise and temperature difference of the entire battery pack;

[0022] The immersion liquid-cooled battery pack is compatible with the existing vehicle thermal management system, is highly practical, and does not require major adjustments to the vehicle's thermal management heat exchange components. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of an immersed liquid-cooled battery pack in an embodiment;

[0024] Figure 2 It is a schematic diagram of the assembly structure of the battery pack shell (excluding the top cover) and the battery module;

[0025] Figure 3 yes Figure 1 A partial enlarged view of middle A;

[0026] Figure 4 yes Figure 1 A partial enlarged view of B in the middle;

[0027] Figure 5 It is an exploded view of the battery pack housing (excluding the top cover);

[0028] Figure 6 This is another exploded view of the battery pack housing (excluding the top cover);

[0029] In the figure: 1, battery pack housing; 1a, module accommodating cavity; 101, bottom plate; 1011, liquid cooling channel; 1012, liquid cooling plate; 1013, first reinforcing beam; 102, side wall; 1021, first side wall; 1021a, flow divider; 1022, second side wall; 1022a, flow confluence; 103, top cover; 104, liquid inlet; 105, liquid outlet; 106, second reinforcing beam;

[0030] 2. Battery module; 201. Module housing; 202. Single cell. DETAILED DESCRIPTION

[0031] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0032] In the description of the present application, it should be noted that, unless otherwise specified, “plurality” means more than two; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0034] In this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0035] Example

[0036] like Figure 1-3 As shown, the embodiment of the immersed liquid-cooled battery pack includes a battery pack shell 1, a battery module 2 and insulating oil; the battery pack shell 1 is provided with an oil filling port, the battery pack shell 1 has a module accommodating cavity 1a and a bottom plate 101, a circumferential side wall 102 and a top cover 103 enclosing the module accommodating cavity 1a; there is at least one battery module 2 and it is arranged in the module accommodating cavity 1a, the battery module 2 includes a module shell 201 and a single battery 202 arranged in the module shell 201; the insulating oil is filled in the module accommodating cavity 1a, and the insulating oil is configured to immerse the single battery 202; a liquid cooling channel 1011 is provided in the bottom plate 101, and the battery pack shell 1 is provided with a liquid inlet 104 and a liquid outlet 105 connected to the liquid cooling channel 1011, and the liquid inlet 104 and the liquid outlet 105 are connected to a circulation pipeline (not shown in the figure).

[0037] In addition to the most basic insulation properties, insulating oil also has good thermal conductivity, low density, good fluidity, and high flash point; in addition, it has the following advantages: flame retardancy meets the requirements of thermal runaway, good chemical compatibility with the substances in the battery pack, no chemical toxicity to the human body, and cost that meets market consumption capacity. Optional insulating oils include but are not limited to high-purity deionized water, fluorinated liquids, mineral oils, and synthetic hydrocarbon compound liquids.

[0038] In addition to the battery module 2 and the shell structure, the basic structure of the battery pack also includes control elements such as the battery energy distribution unit (BDU). The BDU is not immersed in the insulating oil. Optionally, in addition to the module accommodating cavity 1a, the battery pack shell 1 also includes a control element accommodating cavity. The control element accommodating cavity and the module accommodating cavity 1a are isolated from each other. The module accommodating cavity 1a and the control element accommodating cavity can be arranged at the same height or with a height difference. Taking the battery pack in normal use as an example, the module accommodating cavity 1a and the control element accommodating cavity are arranged in parallel in a certain horizontal direction, or the module accommodating cavity 1a is located below the control element accommodating cavity. It can be understood that in addition to the battery module 2, the BMS slave control board is also arranged in the module accommodating cavity 1a. The structural members that enclose the module accommodating cavity are fixedly connected or separated from the structural members that enclose the control element accommodating cavity.

[0039] In this embodiment, the oil filling port is used to inject insulating oil into the module accommodating cavity 1a, and the insulating oil can also be discharged through the oil filling port, or an oil outlet is provided. No circulation channel or circulation pump for inducing the flow of insulating oil in the module accommodating cavity 1a is provided between the oil filling port and the oil outlet, so as to ensure that the insulating oil in the battery pack is relatively still and does not flow when the battery pack is in use.

[0040] Compared with the corresponding arrangement of a liquid cooling plate below the battery module 2, the bottom plate 101 is used as a liquid cooling plate, which can increase the heat exchange area of ​​the liquid cooling plate, for example, the contact heat exchange area between the liquid cooling plate and the insulating oil. Figure 2 As shown in , the outer periphery of the battery module 2 has local protrusions such as positive and negative output terminals, and the heat exchange surface of the liquid cooling plate on the side of the protrusion is vacant, and the insulating oil filled above the vacant surface can directly contact and exchange heat with the liquid cooling plate. In addition, using the liquid cooling plate as the bottom plate 101 can make the structure of the bottom plate 101 more compact than setting up a separate liquid cooling plate, thereby improving the space utilization of the battery pack.

[0041] The cooling medium circulating in the liquid cooling channel 1011 can be selected as water or other liquid heat-conducting media. The cooling medium enters the liquid cooling channel 1011 through the liquid inlet 104, exchanges heat with the side wall 102 of the liquid cooling channel 1011, and then flows out through the liquid outlet 105. Furthermore, a circulation pipeline for the cooling medium is arranged between the liquid inlet 104 and the liquid outlet 105, and the circulation pipeline is connected to a circulation pump and a cooling device for reducing the temperature of the cooling medium. Furthermore, when a relatively large temperature difference occurs in the battery pack, the temperature difference can be reduced by increasing the flow rate of the cooling medium and / or by reducing the temperature of the cooling medium at the liquid inlet 104.

[0042] In an extremely low temperature environment where the external temperature is below freezing, the capacity of the battery module 2 installed in the vehicle is reduced, which may cause malfunctions in the driving of the vehicle. It is understandable that the liquid cooling channel 1011 can not only play a cooling role, but also be used to heat up the battery module 2. For example, a medium with a higher temperature is passed into the liquid cooling channel 1011, and the heat of the medium is transferred to the insulating oil and the battery module 2 through the side wall 102 of the liquid cooling channel 1011. Based on the heat exchange area between the insulating oil and the components in the module accommodating cavity 1a, the heat exchange efficiency of the heating process is high, which is conducive to the rapid heating of the battery module 2.

[0043] like Figure 1 As shown, the bottom plate 101, the circumferential side wall 102 and the top cover 103 are separate parts, and the sealing connection is achieved by welding, bolts and other connection methods and sealing structures such as sealing strips. On the basis of meeting the sealing requirements, as an alternative, the bottom plate 101 and at least part of the side wall 102 are an integral part, or at least part of the side wall 102 and the top cover 103 are an integral part.

[0044] Optionally, the top of the battery pack housing 1 is provided with an exhaust port, and when the module housing cavity 1a is filled with insulating oil, the original air in the module housing cavity 1a is exhausted through the exhaust port. Alternatively, the top cover 103 can also be fixed in a position where the air can be exhausted, and after the insulating oil is filled to a predetermined amount, the top cover 103 of the battery pack housing 1 is sealed.

[0045] The battery module 2 may be any known battery module 2 , including but not limited to a cylindrical battery module 2 and a square battery module 2 .

[0046] like Figure 4-5 As shown, in another embodiment, the module housing 201 is in heat exchange contact with at least the bottom plate 101 of the battery pack housing 1 .

[0047] In this embodiment, the single battery 202 is a cylindrical battery. The cylindrical battery has a Figure 1 The module housing 201 has two opposite ends (in the middle Z direction), and the module housing 201 includes a module bracket fixedly connected to the two ends. The module bracket located at the bottom end of the module is in heat exchange contact with the base plate 101, that is, the module bracket at the bottom end is in direct contact with the base plate 101.

[0048] When the module bracket at the bottom is spaced apart from the bottom plate 101, the path for the heat of the module bracket to be transferred to the cooling medium in the liquid cooling channel 1011 is: module bracket, insulating oil, top wall of the cooling channel, cooling medium; while when the module bracket is in direct contact with the bottom plate 101, the heat transfer path is module bracket, top wall of the cooling channel, cooling medium. The latter heat transfer path is shorter.

[0049] In the heat dissipation structure combining the insulating oil and liquid cooling channels 1011, the heat dissipation path also includes: first, the heating position of the battery module 2, the insulating oil, the battery pack shell 1 (including the bottom plate 101), and the cooling medium; second, the heating position of the battery module 2, the insulating oil, the battery pack shell 1, the side structural parts of the shell or the air.

[0050] The direct contact connection between the bottom plate 101 and the module bracket is any known and feasible one. In this embodiment, the bottom plate 101 includes an aluminum liquid cooling plate, and the module is fixed to the top surface of the liquid cooling bottom plate 101 by bolt connection and / or bonding. In order to further improve the heat exchange efficiency, the glue used for bonding is a thermal conductive glue.

[0051] like Figure 3 As shown, in another preferred embodiment, the number of the liquid cooling channels 1011 is at least two, and the liquid cooling channels 1011 are arranged in parallel.

[0052] Compared with the series connection, the parallel cooling channel is shorter and the temperature of the liquid outlet is relatively lower, which is more conducive to maintaining the temperature difference of the temperature field in the battery pack within a predetermined smaller range.

[0053] The number of liquid cooling channels 1011 can be selected to be three, four or more, and can be set as many as possible while ensuring the mechanical strength of the base plate 101, or can be determined comprehensively based on factors such as the heat dissipation of the battery module 2, the predetermined temperature difference of the battery pack, the cooling medium flow rate, the heat exchange area of ​​the cooling channel, etc.

[0054] like Figure 1 , 5 , 6, in another preferred embodiment, the circumferential side wall 102 has a first direction ( Figure 1 The first side wall 1021 and the second side wall 1022 are opposite to each other in the X direction, the liquid inlet 104 is arranged on the first side wall 1021, and the liquid outlet 105 is arranged on the second side wall 1022. The liquid inlet 104 and the liquid outlet 105 are arranged on the two side walls 102 to avoid the mutual influence of the cooling medium inlet and outlet, reduce the resistance of the liquid inlet and outlet, and reduce the energy consumption of the liquid cooling system.

[0055] like Figure 3 As shown, in another preferred embodiment, the base plate 101 includes a liquid cooling plate 1012 and a first reinforcing beam 1013, the liquid cooling channel 1011 is arranged in the liquid cooling plate 1012, the first reinforcing beam 1013 is sealed between the side-by-side liquid cooling plates 1012, and the first reinforcing beam 1013 divides the module accommodating cavity 1a into at least two module accommodating spaces.

[0056] The function of the first reinforcing beam 1013 is to enhance the mechanical strength of the bottom plate 101. Specifically, the first reinforcing beam 1013 is a profile, and the height of the first reinforcing beam 1013 along the thickness direction of the bottom plate 101 is greater than the thickness of the bottom plate 101. In this embodiment, further, the first reinforcing beam is also used as a connector between the bottom plate 101 and the top cover 103 of the battery pack shell 1: the first reinforcing beam 1013 is provided with a bolt through hole, the length direction of the bolt through hole is consistent with the thickness direction of the bottom plate 101, and the bolt is inserted into the bolt through hole and connected with the nut; in addition to being connected to the circumferential side wall 102, the first reinforcing beam 1013 and the top cover 103 are sandwiched between the cap of the bolt and the nut to improve the stability of the connection structure and the sealing structure of the battery pack shell 1.

[0057] If the first reinforcing beam 1013 is set in the module accommodating cavity 1a where the insulating oil is forced to flow, it will lead to an increase in the dead zone of the insulating oil flow; on the contrary, it is more reasonable to set the first reinforcing beam 1013 in the module accommodating cavity 1a where the insulating oil is relatively static. The first reinforcing beam 1013 will also weaken the flow of insulating oil between adjacent module accommodating spaces caused by temperature difference. The heat of the insulating oil can be transferred to the liquid cooling plate and / or the outside of the battery pack through the first reinforcing beam 1013.

[0058] The number of the first reinforcing beams 1013 is determined according to the size of the battery pack and the connection structure of the battery pack housing 1. Figure 3 As shown in , the first reinforcing beam 1013 occupies a certain battery pack space and bottom area, so on the basis of ensuring the stability of the connection structure, the first reinforcing beam 1013 can be optionally arranged to be less.

[0059] Preferably, the first reinforcement beam 1013 is disposed at the center of the bottom plate 101. Figure 5 , 6 In the embodiment, the liquid cooling plates 1012 of the same size are symmetrically arranged on opposite sides of the first reinforcing beam 1013, and correspondingly, the battery modules 2 are symmetrically arranged on opposite sides of the first reinforcing beam 1013. The heat of the insulating oil can be transferred to the liquid cooling plates via the second reinforcing beam 106.

[0060] like Figure 5 , 6 As shown, in another preferred embodiment, a second reinforcing beam 106 is provided in the module accommodating cavity 1a, and the second reinforcing beam 106 is fixedly connected to the bottom plate 101 and / or the side wall 102, and the second reinforcing beam 106 divides the module accommodating cavity 1a into at least two module accommodating spaces.

[0061] The second reinforcement beam 106 may be parallel to the first reinforcement beam 1013 or intersect with the first reinforcement beam 1013. Figure 5 , 6As shown in the figure, the second reinforcing beam 106 is perpendicular to the first reinforcing beam 1013. The function of the second reinforcing beam 106 is to further improve the stability of the connection structure and the sealing structure of the battery pack housing 1. Similar to the first reinforcing beam 1013, it is more reasonable to arrange the second reinforcing beam 106 in the module accommodating cavity 1a where the insulating oil is relatively static. The second reinforcing beam 106 will also reduce the flow of insulating oil between adjacent module accommodating spaces separated by it due to temperature difference.

[0062] On the basis of ensuring the stability of the connection structure, the second reinforcement beams 106 can be arranged as few as possible. Further, the battery modules 2 are symmetrically arranged on opposite sides of at least one second reinforcement beam 106 .

[0063] like Figure 3 , 4 As shown, in another preferred embodiment, the module housing 201 has a heat dissipation channel, and the heat dissipation channel connects the internal space and the external space of the module housing 201. The internal space of the module housing 201 is the space within the outline of the module housing 201, such as the interval between adjacent cylindrical batteries in the module; the external space refers to the space outside the outline of the module housing 201, such as the insulating oil filling space between adjacent battery modules 2, or the insulating oil filling space between the battery module 2 and the reinforcing beam.

[0064] The heat dissipation channel is the gap between the upper and lower module brackets in the same battery module in the figure, which is conducive to promoting the transfer of heat from the internal space of the module to its external space through the insulating oil.

[0065] In some embodiments, the liquid cooling channel 1011 extends linearly and connects between the first side wall 1021 and the second side wall 1022. The liquid cooling channel 1011 extending linearly has a small flow resistance of the cooling medium; in addition, on the limited top surface of the bottom plate 101, i.e., the heat exchange surface, the positive projection of the cooling channel on the heat exchange surface along the thickness direction of the bottom plate 101 tends to be larger.

[0066] In this embodiment, the base plate 101 provided with the liquid cooling channel 1011 is an aluminum liquid cooling plate 1012, and the cross section of the liquid cooling channel 1011 is a flat hole, so that the thickness of the base plate 101 is thinner and the orthographic projection of the cooling channel on the heat exchange surface along the thickness direction of the base plate 101 is larger.

[0067] like Figure 1 As shown, in another preferred embodiment, the liquid cooling channel 1011 is arranged along the second direction ( Figure 1 The first direction and the second direction are perpendicular to each other, and the liquid inlet 104 is arranged at the center of the liquid cooling channel 1011 arrangement area in the second direction; the liquid outlet 105 is also arranged at the center of the liquid cooling channel 1011 arrangement area in the second direction.

[0068] The cooling medium of the liquid inlet 104 is diverted to each liquid cooling channel 1011, and the cooling medium of each liquid cooling channel 1011 converges to the liquid outlet 105. The liquid inlet 104 and the liquid outlet 105 are arranged at the center position of the second direction of the corresponding side wall 102. The diversion resistance is small, and the diversion path between the liquid cooling channels 1011 that are far apart is shorter, so that the cooling medium can be evenly diverted to each liquid cooling channel 1011.

[0069] like Figure 5 , 6 As shown, in another preferred embodiment, the first side wall 1021 is provided with a connected branch channel 1021a and a branch channel, and the second side wall 1022 is provided with a connected confluence channel 1022a and a branch channel, and the branch channel is connected to the liquid cooling channel 1011; the liquid inlet 104 is connected to the branch channel, and the liquid outlet 105 is connected to the confluence channel.

[0070] Compared with the existing water-cooling plate with a converging flow channel made by stamping and welding, the liquid-cooling flow channel formed by the combination of the side wall 102 and the bottom plate 101 can be made by sealing and connecting the side wall 102 structural parts with the profile. The production steps are simple. Based on the stamped water-cooling plate of the same thickness, the bottom plate 101 composed of the profile has higher mechanical strength, and the battery pack meets the strength requirements for matching with electric vehicles.

[0071] In this embodiment, the side wall 102 structural member is a crossbeam, which is welded to the profile bottom plate 101. The collecting channel of the crossbeam is an open groove, and a branch channel is provided at the bottom of the groove. A cover body is sealed and welded to the groove, and the liquid inlet 104 and the liquid outlet 105 are provided on the corresponding cover body; the branch channel is connected to the liquid cooling channel 1011 one by one.

[0072] Embodiment An electric vehicle includes the immersion-cooled battery pack of any one of the above embodiments.

[0073] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An immersion liquid-cooled battery pack, characterized in that: include: A battery pack housing is provided with an oil filling port, and has a module accommodating cavity and a bottom plate, a circumferential side wall and a top cover enclosing and forming the module accommodating cavity; A battery module, at least one and disposed in the module accommodating cavity, comprising a module housing and a single battery disposed in the module housing; Insulating oil, filling the module accommodating cavity and submerging the single battery; A liquid cooling channel is provided in the bottom plate, and the battery pack shell is provided with a liquid inlet and a liquid outlet communicated with the liquid cooling channel, and the liquid inlet and the liquid outlet are connected to a circulation pipeline.

2. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The module housing is in heat exchange contact with at least a bottom plate of the battery pack housing.

3. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The number of the liquid cooling channels is at least two, and the liquid cooling channels are arranged in parallel.

4. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The circumferential side wall comprises a first side wall and a second side wall which are opposite to each other in a first direction, the liquid inlet is arranged on the first side wall, and the liquid outlet is arranged on the second side wall.

5. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The base plate includes a liquid cooling plate and a first reinforcing beam, the liquid cooling channel is arranged in the liquid cooling plate, the first reinforcing beam is sealed and arranged between the liquid cooling plates arranged side by side, and the first reinforcing beam divides the module accommodating cavity into at least two module accommodating spaces.

6. The immersion liquid-cooled battery pack according to claim 1, characterized in that: A second reinforcing beam is arranged in the module accommodating cavity, the second reinforcing beam is fixedly connected to the bottom plate and / or the side wall, and the second reinforcing beam divides the module accommodating cavity into at least two module accommodating spaces.

7. The immersion liquid-cooled battery pack according to claim 1, characterized in that: The module housing has a heat dissipation channel, and the heat dissipation channel communicates the inner space and the outer space of the module housing.

8. The immersion liquid-cooled battery pack according to claim 4, characterized in that: The liquid cooling channel extends in a straight line and is connected between the first side wall and the second side wall.

9. The immersion liquid-cooled battery pack according to claim 4, characterized in that: The first side wall is provided with connected shunt channels and branch channels, the second side wall is provided with connected confluence channels and branch channels, the branch channels are connected to the liquid cooling channel; the liquid inlet is connected to the shunt channel, and the liquid outlet is connected to the confluence channel.

10. An electric vehicle, characterized in that: A submerged liquid-cooled battery pack comprising any one of claims 1 to 9.

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