CN218333996U

CN218333996U - Liquid cooling system, battery package and consumer

Info

Publication number: CN218333996U
Application number: CN202222690473.1U
Authority: CN
Inventors: 黄红光; 李树辉
Original assignee: GAC Aion New Energy Automobile Co Ltd
Current assignee: GAC Aion New Energy Automobile Co Ltd
Priority date: 2022-10-12
Filing date: 2022-10-12
Publication date: 2023-01-17
Anticipated expiration: 2032-10-12

Abstract

The application provides a liquid cooling system, battery package and consumer relates to power battery technical field. The liquid cooling system includes: a temperature sensing structure; and the liquid cooling structure is provided with a containing cavity, a flow channel cavity is configured in the containing cavity, and the flow channel cavity is configured to be used for containing a temperature sensing structure, so that when the liquid cooling structure dissipates heat of the battery cell, the temperature sensing structure controls the flow of cooling liquid corresponding to the flow channel cavity of the battery cell according to the heat of the battery cell. The temperature-sensing structure is arranged in the flow channel cavity of the liquid cooling structure, when the temperature of the battery core above the liquid cooling structure changes, the temperature-sensing structure can change the volume of the temperature-sensing structure according to the temperature of the battery core, and then the flow of the cooling liquid of the flow channel cavity at the corresponding position of the battery core is controlled, so that the temperature of the battery cores at different temperatures can be accurately adjusted, and the temperatures of the battery cores at different temperatures tend to be the same.

Description

Liquid cooling system, battery package and consumer

Technical Field

The application relates to the technical field of power batteries, in particular to a liquid cooling system, a battery pack and electric equipment.

Background

In recent years, under the support of continuous new energy policy in China, the key technology of new energy automobiles in China makes remarkable progress, the endurance mileage of electric automobiles is increased from 160KM (average value) in 2015 to 400KM in 2020, and therefore the synchronous improvement of electric energy and charge-discharge power of power battery packs is brought. The maintenance of the operation of the battery core in the power battery pack within a reasonable temperature range is a key condition for ensuring the performance and the use safety of the power battery system.

In the related art of power batteries, cooling and heating of battery cells are performed simultaneously, and it is not possible to control heat independently for a single battery cell, however, since the battery cells are disposed at different positions of a battery pack, heat dissipation amounts of the battery cells at different positions are different.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a liquid cooling system, battery package and consumer, can be accurate carry out temperature regulation to the electric core of different temperatures.

In order to achieve the purpose, the following technical scheme is adopted in the application:

in a first aspect, the present application provides a liquid cooling system comprising: a temperature sensing structure; the liquid cooling structure is provided with a containing cavity, a flow channel cavity is configured in the containing cavity, and the flow channel cavity is configured to be used for containing the temperature sensing structure, so that when the liquid cooling structure dissipates heat of the battery cell, the temperature sensing structure controls the flow of the cooling liquid corresponding to the flow channel cavity of the battery cell according to the heat of the battery cell.

In the process of the realization, the temperature sensing structure is arranged in the flow channel cavity of the liquid cooling structure, when the temperature of the battery core above the liquid cooling structure changes, the temperature sensing structure can change the volume of the battery core according to the temperature of the battery core, and then the flow of the cooling liquid of the flow channel cavity at the corresponding position of the battery core is controlled, so that the temperature of the battery cores at different temperatures can be accurately adjusted, and the temperatures of the battery cores at different temperatures tend to be the same.

In some embodiments, a plurality of the battery cells are arranged along a length direction of the temperature-sensitive structure, and a cross-sectional area of the temperature-sensitive structure at the battery cell with a high temperature is larger than a cross-sectional area of the temperature-sensitive structure at the battery cell with a low temperature.

In the process of the realization, the temperature sensing structure is arranged in the flow channel cavity, when the heat generated by the electric cores at different positions is different, the temperature sensing structure can be subjected to volume enlargement according to the temperature of the electric core, and then the cross section area of the flow channel cavity corresponding to the electric core with high temperature is reduced, under the same pressure, the flow speed of the cooling liquid at the position is increased, and further the heat exchange speed is higher, and further the accurate regulation of the temperature of the electric core is achieved.

In some embodiments, the ratio of the cross-sectional area of the temperature-sensitive structure to the cross-sectional area of the runner cavity is 2% to 80%. Can carry out solitary control to electric core automatically, realize reducing the difference in temperature between the electric core, and then improve the performance of product.

In some embodiments, the liquid cooling structure includes a liquid cooling upper plate and a liquid cooling lower plate, the liquid cooling upper plate is connected to the liquid cooling lower plate, and at least one of the liquid cooling upper plate and the liquid cooling lower plate is provided with the runner cavity.

In the process of realizing, the liquid cooling upper plate is connected with the liquid cooling lower plate to form a flow channel cavity for accommodating the temperature sensing structure, so that when the cooling liquid passes through the flow channel cavities at different positions, the temperature sensing structure can control the flow of the flow channel cavity according to the temperature of the battery cell, the battery cell is independently controlled, and the temperature difference between the battery cells is further reduced.

In some embodiments, a groove is formed in one side, close to the liquid cooling upper plate, of the liquid cooling lower plate, a plurality of protrusions are arranged in the groove at intervals, and the length of each protrusion is smaller than that of the corresponding groove, so that the runner cavity is formed.

In a second aspect, the present application further provides a battery pack, including: a plurality of battery cells; and the liquid cooling system of any one of the above items, the upper end of the liquid cooling system is provided with the battery cell for heat conduction of the battery cell.

At the in-process of above-mentioned realization, a plurality of electric cores set up in the top of liquid cooling system, and when electric core carried out charge-discharge, the flow of liquid cooling system can be according to the electric core temperature control coolant liquid of different positions department, and then realizes the heat dissipation to electric core, reduces the difference in temperature between the electric core.

In some embodiments, the battery pack further includes a battery box, the battery box has a receiving cavity configured to receive the electric core, and the liquid cooling system is disposed at a bottom end of the battery box.

In some embodiments, the battery pack further includes a heat conducting structure disposed between the battery cell and the liquid cooling system.

At the in-process of above-mentioned realization, heat conduction structure sets up between electric core and liquid cooling system, can realize fixing between electric core and the liquid cooling system, also can be with the heat conduction to the liquid cooling system that electric core produced simultaneously, and then realizes the heat dissipation of electric core, reduces the probability that thermal runaway takes place, guarantees the security of product.

In some embodiments, the battery pack further includes a thermal insulation structure disposed in the receiving cavity, and the thermal insulation structure is located at the upper end of the battery cell.

In a third aspect, the present application further provides an electric device, including the battery pack according to any one of the above aspects.

Because the electric device provided in the third aspect of the present application includes the battery pack in the technical solution of the second aspect, all technical effects of the above embodiments are achieved, and are not described herein again.

Additional features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for a user of ordinary skill in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a liquid cooling system disclosed in an embodiment of the present application.

Fig. 2 is a sectional view of a liquid cooling system according to an embodiment of the present application.

Fig. 3 is a schematic partial structural diagram of a liquid cooling system according to an embodiment of the present disclosure.

Fig. 4 is a schematic diagram illustrating a principle of heat conduction of a part of a structure of a liquid cooling system to a cell, disclosed in an embodiment of the present application.

Fig. 5 is another schematic diagram of a partial structure of a liquid cooling system for conducting heat to a cell, according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a battery pack disclosed in an embodiment of the present application.

Reference numerals

100. A temperature-sensitive structure; 200. a liquid cooling structure; 201. liquid cooling the upper plate; 202. cooling the lower plate by liquid; 203. a runner cavity; 204. a protrusion; 300. an electric core; 400. an upper cover plate; 500. a gasket; 600. a thermally insulating structure; 700. a heat conducting structure; 800. and (6) a frame.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a user of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case to a user of ordinary skill in the art.

Examples

The power battery is an energy source of the electric automobile and is determined based on electrochemical performance, and the power battery has environmental use requirements, and is generally-30 ℃ to 50 ℃. The optimal use temperature of the power battery is 10-35 ℃, the performance of the power battery is reduced when the temperature is too high or too low, and safety risks such as thermal runaway of the power battery are easily caused when the temperature is too high.

In view of the above reasons, temperature control is particularly important for power batteries, and the power batteries of electric vehicles are subjected to thermal management design at present, wherein the most mainstream is to adjust the temperature of the power batteries by adopting a liquid cooling manner; namely, the power battery is contacted with the liquid cooling plate, and cooling liquid circulates in the liquid cooling plate. When the temperature of the power battery is low, the hot cooling liquid is introduced, and heat is transferred from the cooling liquid to the liquid cooling plate and then to the power battery, so that the power battery is heated; when the temperature of the power battery is high, the cooling liquid with low temperature is introduced, and heat is transferred to the liquid cooling plate from the power battery and then transferred to the cooling liquid, so that the temperature of the power battery is reduced.

However, the power battery is formed by combining a plurality of battery cells in a series-parallel connection mode, and for a common electric vehicle with a endurance mileage of 500KM on the market, a single battery cell 113Ah needs 179 battery cells, each battery cell generates heat in the charging and discharging process, and the temperature of the battery cell affects the resistance of the battery cell, the activity reflected by the electrochemistry inside the battery cell and other factors, which affect the capacity and electric quantity of the battery cell.

Because of the series connection, during the charging process, one of the one hundred cells is fully charged first, and the other cells stop charging, at this time, the other cells may have only 98% of capacity, or 99% of capacity, or other percentage of capacity; in the discharging process, one cell discharges electricity first, the discharging process is stopped, and other cells may still have 1% electricity, 2% electricity, or other percentage of electricity. Due to such physical laws, the battery management system requires high cell consistency, such as voltage consistency, resistance consistency, capacity consistency, electric quantity consistency, and the like. The above-mentioned different temperatures of the cells may cause different voltages, resistances, electric quantities, etc. between the cells, resulting in differences in consistency.

In view of this, as shown in fig. 1 to 5, in a first aspect, the present application provides a liquid cooling system, which may be used for conducting heat to a battery cell 300, and includes: the temperature sensing structure 100 is arranged in a flow channel cavity 203 of the liquid cooling structure 200, and the temperature sensing structure 100 can expand in volume to different degrees according to the temperature of the battery cell 300, so as to change the flow rate of the cooling liquid at the position of the flow channel cavity 203 corresponding to the battery cell 300, and thus, the temperature of the battery cell 300 tends to be consistent.

Specifically, the temperature-sensitive structure 100; the liquid cooling structure 200 has a containing cavity, the containing cavity is configured with a flow channel cavity 203, the flow channel cavity 203 is configured to be used for containing the temperature sensing structure 100, so that when the liquid cooling structure 200 dissipates heat of the battery cell 300, the temperature sensing structure 100 controls the flow rate of the cooling liquid corresponding to the flow channel cavity 203 of the battery cell 300 according to the heat of the battery cell 300.

It can be understood that the temperature-sensitive structure 100 may be fixed to the flow channel cavity 203 by bonding, and certainly, it is not excluded that the temperature-sensitive structure 100 is directly placed in the flow channel cavity 203, and no fixing measure is taken, or the temperature-sensitive structure 100 may be configured as a long strip, a cylinder, a triangle, or a hexagon, and the cross-sectional area of the same temperature-sensitive structure 100 at each location needs to be kept the same, so that when the temperatures of a plurality of the battery cells 300 are the same, the flow rate of the cooling liquid at the position of the flow channel cavity 203 corresponding to each of the battery cells 300 is the same.

It should be noted that, taking three battery cells 300 as an example, as shown in fig. 3 to fig. 5, when the temperature of the battery cell 300 on the left side is equal to the temperature of the battery cell 300 in the middle, the temperature-sensitive structures 100 corresponding to the lower portions of the three battery cells 300 have the same volume, and the cross-sectional areas of the corresponding flow channel cavities 203 are the same; when the temperature of the left-side battery cell 300 is higher than the temperature of the middle battery cell 300, and the temperature of the middle battery cell 300 is higher than the temperature of the right-side battery cell 300, the volume of the temperature-sensitive structure 100 corresponding to the lower part of the left-side battery cell 300 is larger than the volume of the temperature-sensitive structure 100 corresponding to the lower part of the middle battery cell 300, and the volume of the temperature-sensitive structure 100 corresponding to the lower part of the middle battery cell 300 is larger than the volume of the temperature-sensitive structure 100 corresponding to the lower part of the right-side battery cell 300, so that the sectional area of the flow channel cavity 203 corresponding to the left-side battery cell 300 is smaller than the sectional area of the flow channel cavity 203 corresponding to the middle battery cell 300, and the sectional area of the flow channel cavity 203 corresponding to the middle battery cell 300 is smaller than the sectional area of the flow channel cavity 203 corresponding to the right-side battery cell 300; when the temperature of the middle battery cell 300 is higher than the temperature of the left battery cell 300, and the temperature of the left battery cell 300 is higher than the temperature of the right battery cell 300, the volume of the temperature-sensitive structure 100 corresponding to the lower portion of the middle battery cell 300 is larger than the volume of the temperature-sensitive structure 100 corresponding to the lower portion of the left battery cell 300, the volume of the temperature-sensitive structure 100 corresponding to the lower portion of the left battery cell 300 is larger than the volume of the temperature-sensitive structure 100 corresponding to the lower portion of the right battery cell 300, so that the cross-sectional area of the flow channel cavity 203 corresponding to the middle battery cell 300 is smaller than the cross-sectional area of the flow channel cavity 203 corresponding to the left battery cell 300, and the cross-sectional area of the flow channel cavity 203 corresponding to the left battery cell 300 is smaller than the cross-sectional area of the flow channel cavity 203 corresponding to the right battery cell 300.

In the process of the above implementation, the temperature-sensing structure 100 is disposed in the flow channel cavity 203 of the liquid cooling structure 200, and when the temperature of the battery cell 300 above the liquid cooling structure 200 changes, the temperature-sensing structure 100 can change its volume according to the temperature of the battery cell 300, so as to control the flow rate of the cooling liquid in the flow channel cavity 203 at the corresponding position of the battery cell 300, and can precisely adjust the temperature of the battery cells 300 at different temperatures, so that the temperatures of different battery cells 300 tend to be the same.

In some embodiments, a plurality of the battery cells 300 are disposed along the length direction of the temperature-sensitive structure 100, and the cross-sectional area of the temperature-sensitive structure 100 at the battery cells 300 with high temperature (i.e., the volume of the temperature-sensitive structure 100) is larger than the cross-sectional area of the temperature-sensitive structure 100 at the battery cells 300 with low temperature.

In the process of the above-mentioned realization, the temperature-sensing structure 100 sets up in the runner die cavity 203, and the heat that the electricity core 300 of different positions department produced is different, and the temperature-sensing structure 100 can carry out the volume grow according to the temperature of electricity core 300, and then diminishes at the runner die cavity 203 cross-sectional area corresponding to the electricity core 300 department that the temperature is high, under the same pressure, make the coolant flow rate of this department become fast, and then the heat speed of exchange is faster, and then reach accurate regulation to electric core 300 temperature.

In some embodiments, the ratio of the cross-sectional area of the temperature-sensitive structure 100 to the cross-sectional area of the runner cavity 203 is 2% to 80%, for example, the temperature-sensitive structure 100 may select a volume variation range that requires 0 ℃ to 60 ℃, and certainly may also satisfy 25 ℃ to 60 ℃, as the temperature increases, the volume of the temperature-sensitive structure 100 becomes larger and larger, and the ratio of the temperature-sensitive structure 100 to the cross-sectional area of the runner cavity 203 at the normal temperature of 25 ℃ is 5%. The battery cells 300 can be automatically controlled individually, so that the temperature difference between the battery cells 300 can be reduced, and the performance of the product can be improved.

Referring to fig. 1 again, the liquid cooling structure 200 includes a liquid cooling upper plate 201 and a liquid cooling lower plate 202, the liquid cooling upper plate 201 is connected to the liquid cooling lower plate 202, and at least one of the liquid cooling upper plate 201 and the liquid cooling lower plate 202 is provided with the runner cavity 203, that is, the liquid cooling upper plate 201 is arranged in a plane shape, the liquid cooling lower plate 202 is provided with the runner cavity 203, or the liquid cooling upper plate 201 is provided with the flow cavity, the liquid cooling lower plate 202 is arranged in a plane shape, or both the liquid cooling upper plate 201 and the liquid cooling lower plate 202 are provided with the runner cavity 203. For example, the liquid-cooled upper plate 201 and the liquid-cooled lower plate 202 may be fixed by brazing, or may be formed by extrusion of aluminum alloy, so as to fix the temperature-sensitive structure 100 in the flow channel cavity 203 of the extruded liquid-cooled structure 200.

In the implementation process, the liquid-cooled upper plate 201 and the liquid-cooled lower plate 202 are connected to form a flow channel cavity 203 for accommodating the temperature sensing structure 100, so that when the cooling liquid passes through the flow channel cavities 203 at different positions, the temperature sensing structure 100 can control the flow of the flow channel cavity 203 according to the temperature of the battery cell 300, thereby implementing independent control over the battery cell 300 and further reducing the temperature difference between the battery cells 300.

In some embodiments, a groove is formed in one side of the liquid-cooled lower plate 202 close to the liquid-cooled upper plate 201, a plurality of protrusions 204 are arranged in the groove at intervals, and the length of the protrusions 204 is smaller than that of the groove, so as to form the runner cavity 203. Illustratively, the length direction of the protrusion 204 is the length direction of the temperature-sensitive structure 100, the direction in which the plurality of protrusions 204 are arranged at intervals is perpendicular to the length direction of the temperature-sensitive structure 100, and the protrusions 204 are welded to the liquid-cooled upper plate 201, respectively.

As shown in fig. 6, in a second aspect, the present application also provides a battery pack, including: a plurality of cells 300; and the liquid cooling system according to any of the above embodiments, wherein the battery cell 300 is disposed at an upper end of the liquid cooling system, so as to be used for heat conduction of the battery cell 300. The battery cell 300 includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The cell 300 mainly relies on metal ions moving between the positive and negative electrode plates to operate. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current can be passed through without fusing, a plurality of positive electrode tabs are stacked together, and a plurality of negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene).

At the in-process of above-mentioned realization, a plurality of electric cores 300 set up in the top of liquid cooling system, and when electric core 300 carried out charge-discharge, the flow of liquid cooling system can be according to the electric core 300 temperature control coolant liquid of different positions department, and then realizes the heat dissipation to electric core 300, reduces the difference in temperature between electric core 300.

In some embodiments, the battery pack further includes a battery box having a receiving cavity configured to receive the electric core 300, and the liquid cooling system is disposed at a bottom end of the battery box. The battery box body comprises a frame 800 and an upper cover plate 400, wherein the upper cover plate 400 is connected to the upper end of the frame 800 to form the accommodating cavity in a surrounding manner, and a sealing gasket 500 is arranged at the connecting position of the upper cover plate 400 and the frame 800 to ensure the sealing box of the battery box body.

In some embodiments, the battery pack further includes a heat conducting structure 700, wherein the heat conducting structure 700 is disposed between the electric core 300 and the liquid cooling system.

At the in-process of above-mentioned realization, heat conduction structure 700 sets up between electric core 300 and liquid cooling system, can realize the fixed between electric core 300 and the liquid cooling system, also can be with the heat conduction of electric core 300 production to the liquid cooling system simultaneously, and then realizes the heat dissipation of electric core 300, reduces the probability that thermal runaway takes place, guarantees the security of product.

In some embodiments, the battery pack further includes a thermal insulation structure 600, the thermal insulation structure 600 is located between the upper cover plate 400 and the battery cell 300, wherein the thermal insulation structure 600 can perform a thermal insulation function and a thermal insulation function, the thermal insulation structure 600 is disposed in the accommodating cavity, and the thermal insulation structure 600 is located at the upper end of the battery cell 300.

In a third aspect, the present application further provides an electric device, including the battery pack according to any one of the above aspects. The electric equipment can be electric equipment such as an electric toy, an electric tool, a battery car, an electric automobile and a spacecraft, when the electric equipment is a vehicle, the vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extending automobile. The interior of the vehicle is provided with a battery pack, which may be arranged at the bottom or at the head or at the tail of the vehicle. The battery pack may be used for power supply of a vehicle, for example, the battery pack may serve as an operating power source of the vehicle. The vehicle may also include a controller and a motor, the controller being configured to control the battery pack to power the motor, for example, for start-up, navigation, and operational power requirements of the vehicle while traveling.

Since the electric device provided in the third aspect of the present application includes the battery pack described in the technical solution of the second aspect, all technical effects of the embodiments are achieved, and details are not repeated here.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid cooling system, comprising:

a temperature sensing structure;

the liquid cooling structure is provided with a containing cavity, a flow channel cavity is configured in the containing cavity, and the flow channel cavity is configured to be used for containing the temperature sensing structure, so that when the liquid cooling structure dissipates heat of the battery cell, the temperature sensing structure controls the flow of the cooling liquid corresponding to the flow channel cavity of the battery cell according to the heat of the battery cell.

2. The liquid cooling system of claim 1, wherein a plurality of the cells are arranged along a length direction of the temperature-sensitive structure, and a cross-sectional area of the temperature-sensitive structure at a high temperature of the cells is larger than a cross-sectional area of the temperature-sensitive structure at a low temperature of the cells.

3. The liquid cooling system of claim 1, wherein a ratio of a cross-sectional area of the temperature sensitive structure to a cross-sectional area of the runner cavity is 2% to 80%.

4. The liquid cooling system of claim 1, wherein the liquid cooling structure comprises an upper liquid cooling plate and a lower liquid cooling plate, the upper liquid cooling plate is connected to the lower liquid cooling plate, and at least one of the upper liquid cooling plate and the lower liquid cooling plate is provided with the runner cavity.

5. The liquid cooling system of claim 4, wherein a groove is formed in one side of the liquid cooling lower plate close to the liquid cooling upper plate, a plurality of protrusions are arranged in the groove at intervals, and the length of the protrusions is smaller than that of the groove, so as to form the runner cavity.

6. A battery pack, comprising:

a plurality of battery cells; and

the liquid cooling system of any one of claims 1-5, wherein the upper end of the liquid cooling system is configured with the cell for heat conduction from the cell.

7. The battery pack of claim 6, further comprising a battery box having a receiving cavity configured to receive the electrical cores, wherein the liquid cooling system is disposed at a bottom end of the battery box.

8. The battery pack of claim 7, further comprising a thermally conductive structure disposed between the electrical core and the liquid cooling system.

9. The battery pack of claim 7, further comprising a thermal insulation structure disposed within the receiving cavity, wherein the thermal insulation structure is located at an upper end of the cell.

10. An electric device comprising the battery pack according to any one of claims 6 to 9.