CN221226346U

CN221226346U - Battery pack and battery cooling system

Info

Publication number: CN221226346U
Application number: CN202322677824.XU
Authority: CN
Inventors: 林云浩; 陈英旗; 周梦; 汤彦斌; 曹楷; 曹辉
Original assignee: Shanghai Ruipu Energy Co Ltd
Current assignee: Shanghai Ruipu Energy Co Ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2024-06-25
Anticipated expiration: 2033-09-28

Abstract

The utility model discloses a battery pack and a battery cooling system, and relates to the technical field of power battery cooling, on the one hand, the battery pack comprises a shell, a first cooling interface and a second cooling interface, a containing cavity is arranged in the shell, one end of the first cooling interface is communicated with the containing cavity of the battery pack, the other end of the first cooling interface is communicated with a liquid storage tank, one end of the second cooling interface is communicated with the containing cavity of the battery pack, and the other end of the second cooling interface is communicated with the liquid storage tank, so that the shell and the liquid storage tank form a circulation loop through the first cooling interface and the second cooling interface; wherein the first coolant port is located at a lower portion of the housing. In another aspect, the battery cooling system includes the above-described battery pack and a charging device. The plurality of first cooling liquid interfaces are arranged at the lower parts of the different shell surfaces, so that the cooling liquid can be discharged out of the accommodating cavity.

Description

Battery pack and battery cooling system

Technical Field

The utility model relates to the technical field of cooling of power batteries, in particular to a battery pack and a battery cooling system.

Background

The quick-charging technology can effectively solve the problem that the electric automobile is short in driving duration, and in the quick-charging process, the energy density of the battery is rapidly increased, so that the risk of thermal runaway exists, and the life and property safety of passengers is endangered. Meanwhile, the larger temperature difference among batteries in the fast charge process can lead to the reduction of the charge and discharge capacity of the batteries, the service life is reduced, and the running of the electric automobile is influenced.

Cooling systems currently in widespread use for thermal management of electric vehicle batteries include air cooling (air cooling) and liquid cooling (liquid cooling). The liquid cooling has higher heat transfer efficiency and specific heat capacity, the structural design of the battery is also more flexible and changeable, and the battery is currently called as a battery thermal management scheme with the best comprehensive performance. The liquid cooling is divided into indirect liquid cooling, i.e. cooling plate liquid cooling, and direct liquid cooling, i.e. immersion liquid cooling, according to the contact mode, wherein the immersion liquid cooling is realized by immersing the battery in a special insulating protection liquid. This technique can rapidly absorb heat during the charge and discharge of the battery and bring it to an external circuit for cooling, so as to ensure that the battery operates in an optimal temperature range, thereby extending its service life. Compared with the traditional air cooling heat dissipation and liquid cooling heat dissipation technology, the immersed liquid cooling technology has higher cooling speed and shorter cooling time, so that the immersed liquid cooling technology has higher efficiency and better performance in the aspect of battery cooling.

The immersed liquid cooling is adopted in the parking quick charging process, but after the vehicle is charged, the cooling liquid in the battery pack is required to be discharged out of the battery pack to reduce the weight, and when the vehicle is parked on the ground with higher gradient for charging, the battery pack is inclined to further cause partial cooling liquid extraction difficulty.

Disclosure of utility model

Aiming at the defects in the prior art, the utility model aims to provide a battery pack and a battery cooling system so as to solve the problem that in the prior art, when a vehicle stops on the ground with higher inclination for charging, the battery pack is inclined, so that part of cooling liquid is difficult to extract.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

In a first aspect, the present application provides a battery pack comprising:

A housing having a receiving chamber therein, a plurality of first coolant ports and at least one second coolant port being provided on the housing, one end of the first coolant port being communicated with the receiving chamber of the battery pack, the other end of the first coolant port being adapted to be communicated with a reservoir, one end of the second coolant port being adapted to be communicated with the receiving chamber of the battery pack, the other end of the second coolant port being adapted to be communicated with the reservoir, such that the housing and the reservoir form a circulation loop through the first coolant port and the second coolant port;

The first cooling liquid interface is positioned at the lower part of the shell and positioned at different surfaces of the shell.

In some alternative embodiments, the housing includes a bottom plate and a side plate surrounding a peripheral side of the bottom plate, and the first coolant port is located on the bottom plate and/or on the side plate.

In some alternative embodiments, the first coolant port is located on the side plate, and the first coolant port is spaced from the bottom plate by 0mm to 50mm.

In some alternative embodiments, the first coolant port is provided in a predetermined range of the lower corner of the housing, and the second coolant port is provided in a predetermined range of the upper corner of the housing.

In some optional embodiments, the housing is further provided with a liquid inlet and a liquid outlet, and the accommodating cavity is provided with a cooling assembly, and the cooling assembly is respectively communicated with the liquid inlet and the liquid outlet.

In some alternative embodiments, a ventilation valve for exhausting the gas in the accommodating chamber is provided at an upper portion of the housing.

In another aspect, the present application further provides a battery cooling system, including a charging device and any one of the above battery packs, where the charging device includes:

a liquid storage tank for containing a cooling liquid;

and the liquid storage tank is communicated with the first cooling liquid interface and the second cooling liquid interface of the battery pack through the pumping assembly.

In some alternative embodiments, the suction assembly includes:

A first pipe for communicating the first coolant port with the tank;

a second pipe for communicating the second coolant port with the tank;

The liquid return pump is arranged on the second pipeline and is used for sucking the cooling liquid in the accommodating cavity into the liquid storage tank;

The liquid inlet pump is communicated with the liquid storage tank and the first cooling liquid interface through a first branch of the first pipeline and is used for sucking cooling liquid in the liquid storage tank into the accommodating cavity;

And the liquid pump is communicated with the liquid storage tank and the first cooling liquid interface through a second branch of the first pipeline and is used for sucking the cooling liquid in the accommodating cavity into the liquid storage tank.

In some alternative embodiments, the suction assembly includes:

A first pipe for communicating the first coolant port with the tank;

a second pipe for communicating the second coolant port with the tank;

the liquid inlet pump is arranged on the second pipeline and is used for sucking the cooling liquid in the liquid storage tank into the accommodating cavity;

In some alternative embodiments, a liquid level sensor is disposed in the accommodating cavity near the second cooling liquid interface, and is in signal connection with the liquid return pump.

Compared with the prior art, the utility model has the advantages that: through set up at least one first coolant liquid interface and at least one second coolant liquid interface on the casing to make between the holding chamber of liquid reserve tank and battery package intercommunication, form the circulation circuit that supplies the submergence coolant liquid circulation, thereby can make the submergence coolant liquid that holds the intracavity circulate, provide cooling efficiency, set up a plurality of first coolant liquid interfaces in the lower part of casing and lie in the different faces of casing simultaneously, when first coolant liquid interface is used for the submergence coolant liquid that holds the intracavity of discharge, can make submergence coolant liquid discharge completely, solved the higher problem that leads to partial coolant liquid to discharge difficulty of ground gradient when stopping.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a battery pack according to an embodiment of the present utility model;

Fig. 2 is a front view and a side view of fig. 1;

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is an enlarged partial schematic view of B in FIG. 4;

fig. 6 is a schematic diagram illustrating a battery cooling system according to an embodiment of the present utility model.

In the figure: 1. a housing; 11. a first coolant port; 12. a second coolant port; 13. a liquid inlet; 14. a liquid outlet; 15. a bottom plate; 16. a side plate; 2. a battery; 3. a cooling assembly; 4. a liquid storage tank; 5. a suction assembly; 51. a first pipe; 52. a liquid inlet pump; 53. a second pipe; 54. a liquid return pump; 55. and (5) a liquid pump.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Embodiments of a battery pack and a battery cooling system according to the present utility model are described in further detail below with reference to the accompanying drawings.

In a first aspect, as shown in fig. 1 to 5, the present application provides a battery pack including a case 1, a first cooling liquid port 11, and a second cooling port 12. The accommodating chamber in the housing 1 is used for accommodating the battery 2, and the cooling liquid is injected into the accommodating chamber of the housing 1, so that the battery 2 is subjected to immersion liquid cooling.

Specifically, the housing 1 has a receiving cavity therein, at least one first cooling liquid interface 11 and at least one second cooling liquid interface 12 are provided on the housing 1, one end of the first cooling liquid interface 11 is communicated with the receiving cavity of the battery pack, the other end of the first cooling liquid interface 11 is used for being communicated with the liquid storage tank 4, one end of the second cooling liquid interface 12 is communicated with the receiving cavity of the battery pack, and the other end of the second cooling liquid interface 12 is used for being communicated with the liquid storage tank 4, so that the housing 1 and the liquid storage tank 4 form a circulation loop through the first cooling liquid interface 11 and the second cooling liquid interface 12; wherein the first cooling liquid port 11 is located at the lower part of the housing 1.

That is, the cooling liquid can flow into the casing 1 through the first cooling liquid port 11, and the casing 1 is discharged from the second cooling liquid port 12, or the cooling liquid can flow into the casing 1 through the second cooling liquid port 12, and the casing 1 is discharged from the first cooling liquid port 11, so that the cooling liquid circulates inside and outside the accommodation chamber. After cooling the battery pack, the cooling liquid is discharged to the liquid storage tank 4 through the first cooling liquid interface 11 positioned at the lower part of the battery pack shell, and it should be noted that the shell 1 is a sealed shell, and the cooling liquid cannot overflow from other positions of the shell 1 except the first cooling liquid interface 11 and the second cooling liquid interface 12.

In this case, the cooling liquid may be injected to fully contact the battery 2 directly to achieve cooling, and the cooling liquid is an insulating liquid, such as a fluorinated liquid, mineral oil, silicone oil, synthetic grease, or the like. In addition, the embodiment of the application does not limit the specific arrangement mode of the batteries in the battery pack.

In this example, the first coolant port 11 is located at a lower portion of the housing chamber, and the second coolant port 12 is located at an upper portion of the housing chamber.

It will be appreciated that in this case, the injection of the cooling liquid from the lower portion of the accommodation chamber may facilitate the evacuation of the gas inside the accommodation chamber, bringing the cooling liquid into sufficient contact with the battery 2. At the same time, the coolant is discharged from the second coolant port 12 located at the upper part of the accommodating chamber, so that it is ensured that the coolant is discharged from the second coolant port 12 after completely immersing the battery 2, thereby forming a circulating flow of the coolant.

Of course, in other embodiments, it is also possible to let the cooling liquid into the accommodating chamber from the second cooling liquid port 12 at the upper part and discharge the cooling liquid out of the accommodating chamber from the first cooling liquid port 11 at the bottom part, but it should be ensured that the battery 2 is completely immersed when the cooling liquid enters into the accommodating chamber from the upper part and is discharged out of the accommodating chamber from the bottom part. For example, the cooling liquid can be completely filled in the accommodating chamber while sufficiently discharging the gas in the accommodating chamber through a plurality of cycles by adjusting the cooling liquid inflow rate of the upper second cooling liquid port 12 and the cooling liquid outflow rate of the lower first cooling liquid port 11.

In some alternative embodiments, the upper part of the housing 1 is provided with a ventilation valve for exhausting the gas in the accommodating cavity, so that the gas in the accommodating cavity can be exhausted smoothly when the cooling liquid enters the accommodating cavity from the second cooling liquid interface 12 at the upper part and is exhausted to the outside of the accommodating cavity from the first cooling liquid interface 11 at the bottom.

When the cooling liquid is filled, the first cooling liquid port 11 at the lower part is opened to circulate the cooling liquid.

It can be seen that injecting the cooling fluid from the lower portion of the receiving chamber and draining it from the second cooling fluid connection 12 at the lower portion of the receiving chamber is an efficient embodiment, allowing the cooling fluid to quickly fill the receiving chamber and complete the cycle.

In some alternative embodiments, as shown in fig. 2, the housing 1 includes a bottom plate 15 and a side plate 16 provided around the bottom plate 15, and the first cooling liquid port 11 is located on the bottom plate 15 and/or the side plate 16.

In other possible embodiments, the first coolant port may also be disposed between the bottom plate and the side plate.

Preferably, the first coolant port 11 is located on the side plate 16 and spaced apart from the bottom plate 15 by a predetermined distance.

In this example, the first coolant port 11 is spaced from the bottom plate 15 by 0mm to 50mm.

Of course, the closer the first coolant port 11 is to the bottom plate 15, the more favorable the complete discharge of the coolant, and the person skilled in the art can make corresponding settings according to actual needs.

In some alternative embodiments, the first cooling fluid port 11 is provided in a predetermined range of the lower corner of the housing 1, and the second cooling fluid port 12 is provided in a predetermined range of the upper corner of the housing 1.

In this example, taking the case 1 including 4 corners as an example, the four corners of the lower portion of the case 1 are respectively provided with the first cooling liquid ports 11, and the four corners of the upper portion of the rectangular case 1 are respectively provided with the second cooling liquid ports 12.

It will be appreciated that the four first coolant ports 11 and the four second coolant ports 12 can improve the inflow and discharge efficiency of the coolant, and at the same time, the second coolant ports 12 at the four top corners of the bottom can ensure that the coolant in the accommodating chamber can be completely discharged from the second coolant ports 12 regardless of the inclination angle of the battery pack in the horizontal direction.

In some alternative embodiments, the side wall of the housing 1 is further provided with a liquid inlet 13 and a liquid outlet 14. The bottom of the cavity of the accommodating cavity is also provided with a cooling component 3 which is positioned below the battery 2 and is communicated with the liquid inlet 13 and the liquid outlet 14.

It will be appreciated that other cooling systems may be provided within the battery pack, such as air cooling, indirect liquid cooling, phase change material cooling, thermoelectric cooler cooling, and the like. In this example, the cooling assembly 3 is disposed below the battery 2, and the cooling liquid in the cooling assembly 3 circulates through the liquid inlet 13 and the liquid outlet 14, so as to cool the battery pack during use or during slow charging.

In this case, the cooling unit 3 may be a cooling organ pipe uniformly arranged under the battery 2.

In other possible embodiments, the cooling assembly may be disposed above the cells, or between adjacent cells, in the form of a liquid cooling plate or otherwise, as the embodiments of the application are not limited in this regard. The cooling fluid in the cooling module and the cooling fluid in the reservoir may be the same or different fluids.

In a second aspect, as shown in fig. 6, the present application further provides a battery cooling system, which includes a charging device and the battery pack, wherein the charging device includes a liquid storage tank 4 and a suction assembly 5.

Specifically, the liquid storage tank 4 is used for containing cooling liquid, and is connected with the battery pack through the suction assembly 5. The battery pack comprises a shell 1, a first cooling liquid interface 11 and a second cooling liquid interface 12, wherein a containing cavity is formed in the shell 1, a plurality of first cooling liquid interfaces 11 and at least one second cooling liquid interface 12 are arranged on the shell 1, and the liquid storage tank 4 is communicated with the first cooling liquid interfaces 11 and the second cooling liquid interfaces 12 through a suction assembly 5. The battery 2 is placed in the above-mentioned accommodation chamber.

That is, by the suction assembly 5, the cooling liquid can be injected into the accommodating cavity from the first cooling liquid port 11 and discharged from the second cooling liquid port 12, or the cooling liquid can be injected into the accommodating cavity from the second cooling liquid port 12 and discharged from the first cooling liquid port 11, so that the circulating flow of the cooling liquid is formed, and the cooling down of the battery 2 is efficiently performed.

When the battery pack is in actual use, the battery cooling system can be started when the battery pack needs to be cooled rapidly and efficiently. For example, when the vehicle is stopped and filled quickly, the liquid storage tank 4 can be communicated with the first cooling liquid interface 11 and the second cooling liquid interface 12 on the battery pack through the suction assembly 5, and submerged cooling is started to meet the requirement of quick heat dissipation during quick filling.

In some alternative embodiments, the suction assembly 5 includes a first conduit 51, a second conduit 53, and a fluid intake pump 52, a fluid return pump 54, and a fluid withdrawal pump 55. A first pipe 51 for communicating the first coolant port 11 with the tank 4; a second pipe 53 for connecting the second coolant port 12 and the tank 4; the liquid inlet pump 52 is connected to the liquid storage tank 4 and the first cooling liquid interface 11 through a first branch of the first pipeline 51, and is used for sucking the cooling liquid in the liquid storage tank 4 into the accommodating cavity; a liquid return pump 54 is arranged on the second pipeline 53 and is used for sucking the cooling liquid in the accommodating cavity into the liquid storage tank 4; the liquid pump 55 communicates with the liquid storage tank 4 and the first cooling liquid interface 11 through the second branch of the first pipeline 51, and is used for pumping the cooling liquid in the accommodating cavity into the liquid storage tank 4.

It will be appreciated that when the feed pump 52 starts to operate, the coolant flows from the reservoir 4 into the receiving chamber through the first coolant port 11 located in the lower portion of the housing 1 until the coolant completely fills the receiving chamber and submerges the battery 2, and then the feed pump 52 continues to operate, and the return pump 54 is started, so that the coolant accelerates to flow back into the reservoir 4 from the second coolant port 12 located in the upper portion of the housing, thereby forming a circulation to cool the battery 2. When the battery 2 is cooled without using the cooling liquid after the quick charge is finished, the cooling liquid is discharged from the accommodating cavity at the moment, so that the weight of the battery pack is reduced, meanwhile, the leakage of the cooling liquid in the accommodating cavity is avoided in the running process of the vehicle, the cooling liquid in the accommodating cavity is pumped out by the liquid pump 55, and the liquid pump 55 is arranged on the first pipeline 51, so that the cooling liquid can be discharged from the bottom of the accommodating cavity, and the cooling liquid can be completely discharged.

In other alternative embodiments, the suction module 5 includes a first conduit 51, a second conduit 53, and a fluid intake pump 52, a fluid intake pump 55. A first pipe 51 for communicating the first coolant port 11 with the tank 4; a second pipe 53 for connecting the second coolant port 12 and the tank 4; the liquid inlet pump 52 is arranged on the second pipeline 53 and is used for sucking the cooling liquid in the liquid storage tank 4 into the accommodating cavity; the liquid pump 55 is connected to the liquid storage tank 4 and the first cooling liquid port 11 through the second branch of the first pipe 51, and is configured to pump the cooling liquid in the accommodating cavity into the liquid storage tank 4.

It will be appreciated that when the inlet pump 52 starts to operate, the coolant flows from the reservoir 4 into the receiving chamber through the second coolant port 12 located at the upper portion of the housing until the coolant completely fills the receiving chamber and submerges the battery 2, and then the inlet pump 52 continues to operate, and the pump 55 is started, so that the coolant accelerates to flow back into the reservoir 4 from the first coolant port 11 located at the lower portion of the housing 1, thereby forming a circulation to cool the battery 2. When the battery 2 is cooled without using the cooling liquid after the quick charge is finished, the cooling liquid is discharged from the accommodating cavity at the moment, so that the weight of the battery pack is reduced, meanwhile, the leakage of the cooling liquid in the accommodating cavity is avoided in the running process of the vehicle, the cooling liquid in the accommodating cavity is pumped out by the liquid pump 55, and the liquid pump 55 is arranged on the first pipeline 51, so that the cooling liquid can be discharged from the bottom of the accommodating cavity, and the cooling liquid is ensured to be completely discharged.

It should be noted that when the cooling fluid enters the accommodating chamber from the first cooling fluid port 11, the second cooling fluid port 12 should be opened to discharge the gas in the accommodating chamber. Similarly, when the cooling liquid enters the accommodating cavity from the second cooling liquid interface 12, the first cooling liquid interface 11 should be opened to discharge the gas in the accommodating cavity. Or the gas is exhausted by a gas-permeable valve on the casing 1.

In some alternative embodiments, a level sensor is disposed within the receiving chamber proximate the second coolant port 12 and is in signal communication with the return pump 54.

It will be appreciated that the function of the level sensor is to sense whether the coolant in the receiving chamber reaches the second coolant port 12. When the second coolant port 12 is reached, it indicates that the coolant has completely filled the receiving chamber, and the return pump 54 receives the signal from the level sensor and operates to cooperate with the inlet pump 52 to circulate the coolant in the receiving chamber and in the reservoir 4.

Therefore, the second coolant port 12 should be disposed at the very top of the receiving chamber to satisfy the sensing signal of the level sensor after the receiving chamber is filled with the coolant.

The working principle of the embodiment of the utility model is as follows: when the electric automobile runs normally and stops slowly to charge, the battery 2 is cooled by the vehicle-mounted cooling system consisting of the cooling component 3, the liquid inlet 13 and the liquid outlet 14. When the vehicle is stopped and charged quickly, the battery pack and the battery cooling system are locked and connected, the first pipeline 51 is communicated with the first cooling liquid interface 11, and the second pipeline 53 is communicated with the second cooling liquid interface 12, so that the liquid storage tank 4 is connected with the battery pack through the suction assembly 5. After the connection is locked, the first coolant port 11 is opened, the liquid inlet pump 52 starts to operate, and the coolant is injected into the battery pack from the liquid storage tank 4 via the first pipe 51 to cool the battery 2. At the same time, the second duct 53 is opened to discharge the gas in the battery pack. When the cooling liquid reaches the designated height, the liquid level sensor transmits a signal to the liquid return pump 54, the liquid return pump 54 starts to work, the cooling liquid returns to the liquid storage tank 4 from the battery pack through the second pipeline 53, and the cooling liquid continuously circulates to strengthen the cooling effect in the quick charging process. When the quick charge is completed or the quick charge is stopped, the liquid inlet pump 52 and the liquid return pump 54 are turned off, the liquid pump 55 starts to operate, and the cooling liquid in the battery pack is pumped back into the liquid storage tank 4 through the first pipeline 51. When all the cooling liquid in the battery pack is pumped out, the liquid pump 55 is closed, the first cooling liquid interface 11 and the second cooling liquid interface 12 are closed at the same time, and the connection locking is released.

According to the battery pack and the battery cooling system provided by the embodiment of the utility model, the first cooling liquid interface 11 and the second cooling liquid interface 12 are arranged on the shell 1, so that cooling liquid circularly flows inside and outside the accommodating cavity, the battery 2 is efficiently cooled, and the cooling requirement of quick charge is met; the first cooling liquid interface 11 is arranged at the lower part of the shell 1, so that cooling liquid is injected from the lower part of the accommodating cavity, the gas in the accommodating cavity can be conveniently discharged, and the cooling liquid is fully contacted with the battery 2; injecting the cooling liquid from the lower part of the accommodating cavity, and discharging the cooling liquid from the first cooling liquid interface 11 positioned at the lower part of the accommodating cavity, so that the cooling liquid can be completely discharged; the plurality of first cooling liquid interfaces 11 and the plurality of second cooling liquid interfaces 12 can improve the inflow and discharge efficiency of cooling liquid, and meanwhile, the first cooling liquid interfaces positioned on different surfaces of the bottom of the shell can ensure that the cooling liquid in the accommodating cavity can be completely emptied from the second cooling liquid interfaces 12 no matter how the battery pack is inclined in the horizontal direction; the cooling assembly 3 is arranged below the battery 2, and the cooling liquid in the cooling assembly 3 is circulated through the liquid inlet 13 and the liquid outlet 14, so that cooling is provided for the battery pack in the use process or the slow charging process; the battery cooling system is arranged, when the vehicle is stopped and is rapidly charged, the liquid storage tank 4 is communicated with the first cooling liquid interface 11 and the second cooling liquid interface 12 on the battery pack through the suction component 5, and the immersed cooling is started to meet the requirement of rapid heat dissipation during rapid charging; by arranging the liquid pump 55, when the battery 2 is not required to be cooled by using the cooling liquid after the quick charging is finished, the cooling liquid is discharged from the accommodating cavity, so that the weight of the battery pack is reduced, and meanwhile, the leakage of the cooling liquid in the running process of the vehicle is avoided; the liquid return pump 54 is matched with the liquid inlet pump 52, so that the cooling liquid in the accommodating cavity and the liquid storage tank 4 can be circulated more efficiently, and the cooling effect is improved; the level sensor is arranged so that the liquid return pump 54 can start operating when the cooling liquid is completely filled in the receiving chamber.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "front", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, comprising:

The battery pack cooling device comprises a shell (1), wherein a containing cavity is formed in the shell (1), a plurality of first cooling liquid interfaces (11) and at least one second cooling liquid interface (12) are arranged on the shell (1), one end of each first cooling liquid interface (11) is communicated with the containing cavity of the battery pack, the other end of each first cooling liquid interface (11) is communicated with a liquid storage tank (4), one end of each second cooling liquid interface (12) is communicated with the containing cavity of the battery pack, and the other end of each second cooling liquid interface (12) is communicated with the liquid storage tank (4), so that the shell (1) and the liquid storage tank (4) form a circulating loop through the first cooling liquid interfaces (11) and the second cooling liquid interfaces (12);

wherein the first cooling liquid interface (11) is positioned at the lower part of the shell (1) and positioned at different surfaces of the shell.

2. The battery pack according to claim 1, wherein the housing (1) includes a bottom plate (15) and a side plate (16) surrounding a peripheral side of the bottom plate (15), and the first coolant port (11) is located on the bottom plate (15) and/or on the side plate (16).

3. The battery pack according to claim 2, wherein the first coolant port (11) is located on the side plate (16), and the first coolant port (11) is spaced from the bottom plate (15) by 0mm to 50mm.

4. The battery pack according to claim 1, wherein the first coolant port (11) is provided in a preset range of the lower corner of the casing (1), and the second coolant port (12) is provided in a preset range of the upper corner of the casing (1).

5. The battery pack according to claim 1, wherein the shell (1) is further provided with a liquid inlet (13) and a liquid outlet (14), the accommodating cavity is internally provided with a cooling component (3), and the cooling component (3) is respectively communicated with the liquid inlet (13) and the liquid outlet (14).

6. A battery pack according to claim 1, wherein a ventilation valve for exhausting the gas in the accommodation chamber is provided at an upper portion of the housing (1).

7. A battery cooling system comprising a charging device and the battery pack of any one of claims 1-6, the charging device comprising:

a liquid storage tank (4) for containing a cooling liquid;

the liquid storage tank (4) is communicated with the first cooling liquid interface (11) and the second cooling liquid interface (12) of the battery pack through the pumping assembly (5).

8. The battery cooling system according to claim 7, wherein the suction assembly (5) comprises:

-a first conduit (51) for communicating the first cooling liquid interface (11) with the tank (4);

-a second conduit (53) for communicating the second cooling liquid interface (12) with the tank (4);

A liquid return pump (54) arranged on the second pipeline (53) and used for sucking the cooling liquid in the accommodating cavity into the liquid storage tank (4);

A liquid inlet pump (52) which is communicated with the liquid storage tank (4) and the first cooling liquid interface (11) through a first branch of the first pipeline (51) and is used for sucking cooling liquid in the liquid storage tank (4) into the accommodating cavity;

And the liquid suction pump (55) is communicated with the liquid storage tank (4) and the first cooling liquid interface (11) through a second branch of the first pipeline (51) and is used for sucking cooling liquid in the accommodating cavity into the liquid storage tank (4).

9. The battery cooling system according to claim 7, wherein the suction assembly (5) comprises:

A liquid inlet pump (52) arranged on the second pipeline (53) and used for sucking the cooling liquid in the liquid storage tank (4) into the accommodating cavity;

10. The battery cooling system according to claim 8, characterized in that a liquid level sensor is provided in the receiving chamber near the second cooling liquid connection (12) and is in signal connection with the liquid return pump (54).