CN216389577U - Thermal management system of battery and power utilization device - Google Patents

Abstract

The application provides a thermal management system of a battery and a power utilization device. The heat management system of the battery comprises a heat exchange box, wherein the heat exchange box is provided with a first cavity and at least one second cavity which are not communicated with each other, the first cavity is used for containing a heat exchange medium, the second cavity is used for placing a battery monomer, and the second cavity is surrounded by the first cavity. According to the application, the battery monomer can exchange heat more uniformly, and the heat exchange efficiency is improved.

Description

Thermal management system of battery and power utilization device

Technical Field

The present application relates to the field of batteries, and more particularly, to a thermal management system for a battery and a power consumption device.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry. Under such circumstances, electric vehicles are an important component of sustainable development of the automobile industry due to their energy saving and environmental protection advantages. In the case of electric vehicles, battery technology is an important factor in the development thereof.

In addition to improving the performance of the battery, the problem of thermal management (including cooling and warming of the battery), and the safety problems caused thereby, are considerable problems in the development of battery technology. Therefore, how to improve the efficiency and effect of thermal management is a technical problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a battery thermal management system and a power consumption device that can improve the efficiency and effect of thermal management and further improve safety.

In order to achieve the above object, a first aspect of the present application provides a thermal management system for a battery, including a heat exchange box having a first cavity and at least one second cavity that are not communicated with each other, the first cavity being configured to accommodate a heat exchange medium, the second cavity being configured to accommodate a battery cell, the second cavity being configured to be surrounded by the first cavity.

Because the second cavity is surrounded by the first cavity that holds heat transfer medium, consequently the second cavity can carry out the heat transfer with heat transfer medium fully to can manage effectively the heat, improve thermal management efficiency, and then improve the safety in utilization of battery.

In some embodiments, the heat exchange box comprises: a bottom wall of the tank; a box side wall, one end of which is connected with the periphery of the box bottom wall; and a top box wall having a periphery connected to the other end of the side box wall.

Therefore, the box-shaped space of the heat exchange box is formed, the structure is simple, and the processing is easy.

In some embodiments, a plurality of through holes are formed in the top wall of the tank, and each of the second cavities is communicated with the outside of the heat exchange tank through the through hole.

Since the second cavity for placing the battery cell is communicated with the outside of the heat exchange box, the battery cell can be easily put in or taken out with respect to the second cavity.

In some embodiments, each of the second cavities includes a bottom wall and a side wall connected to the bottom wall, and a bottomed cylindrical space surrounded by the bottom wall and the side wall constitutes the second cavity; each of the second cavities is separated from the first cavity by the bottom wall and the side wall; the side wall of each second cavity is connected with the edge of the through hole.

Therefore, the second cavity can be formed in the space where the first cavity is located by a simple structure, and the two cavities can be separated, so that the single battery placed in the second cavity can be prevented from contacting with a heat exchange medium, and the proper working environment of the single battery can be ensured; and the battery cell placed in the second cavity can be held by a simple structure.

In some embodiments, the bottom wall, the side walls and the top wall are all structures with waterproof buffer materials clamped between the inner walls and the outer walls.

Because each wall of the heat exchange box is of a double-layer structure and the waterproof buffer material is clamped inside the heat exchange box, the supporting strength of each wall of the heat exchange box can be improved; the cushion has a buffer function, and can be applied to scenes such as vehicles and the like with impact, vibration and the like; in addition, because still have waterproof effect, consequently can prevent heat transfer medium's leakage or heat transfer case outside liquid such as rainwater, muddy water, cooling water from getting into heat transfer incasement portion.

In some embodiments, the heat exchange box is provided with a heat exchange medium input pipe and a heat exchange medium output pipe, and the heat exchange medium input pipe and the heat exchange medium output pipe are respectively communicated with the first cavity.

From this not only can carry out the heat pipe reason with the heat transfer medium of saving in the heat transfer case to battery monomer, can also make the heat transfer medium circulation, cool off battery monomer through endless heat transfer medium, consequently can obtain higher cooling efficiency and better cooling effect.

A second aspect of the present application provides an electric device including: a first aspect of the present application provides a thermal management system for a battery; and a battery cell disposed in the second cavity in the heat exchange box.

From this, because battery monomer carries out the heat transfer with the mode that the wall that separates the second cavity soaks in heat transfer medium, consequently can carry out effectual heat transfer to battery monomer, even also can carry out reliable heat transfer to battery monomer under the scene of heat transfer medium circulation of not being convenient for. In addition, heat preservation can be carried out on the battery monomer placed in the second cavity by evacuating heat exchange media such as water in the first cavity. And further, the safety of the battery used by the electric device can be ensured under various environments.

In some embodiments, the wall constituting the second cavity is in surface contact with a portion of the outer surface of the battery cell.

The wall of the second cavity is in contact with the outer surface of the battery monomer, so that heat exchange can be carried out more efficiently, and the heat exchange efficiency is improved; and the supporting function of the battery cells can be improved.

In some embodiments, the second cavity has an opening facing an outside of the heat exchange case, and a remaining portion of the battery cell other than a portion of the outer surface is exposed from the opening.

Because a part of the single battery is exposed out of the heat exchange box, the single battery is convenient to take and place relative to the second cavity and electric energy is led out from the single battery.

In some embodiments, the battery cell is a cylindrical battery cell.

Therefore, the cylindrical battery monomer is effectively cooled, and the defects of difficult processing, uneven cooling and the like of the traditional cooling plate suitable for the cylindrical battery monomer are overcome.

Drawings

Fig. 1 is a schematic structural view schematically showing a vehicle according to an embodiment of the present application.

Fig. 2 is a schematic view schematically showing a battery cell according to an embodiment of the present application.

Fig. 3 is a schematic plan view schematically illustrating a heat exchange case in a state in which a battery cell is placed according to an embodiment of the present application.

Fig. 4 is a perspective view schematically illustrating a heat exchange box in a state in which a battery cell is placed according to an embodiment of the present application.

Fig. 5 is a schematic cross-sectional view schematically illustrating a heat exchange tank according to an embodiment of the present application.

Fig. 6 is a sectional view schematically showing a heat exchange tank according to an embodiment of the present application.

Description of reference numerals:

1-cell (cylindrical cell); 2-a heat exchange box; 3-input pipeline; 4-an output pipeline; 5-a first cavity; 6-a second cavity; 21-bottom wall of the tank; 22-a first tank side wall; 23-a second tank side wall; 24-a tank top wall; 25-a through hole; 26-a bottom wall; 27-a side wall; 1000-a vehicle; 100-a battery; 200-a controller; 300-motor.

Detailed Description

Hereinafter, specific embodiments of the present application will be described in detail with reference to the drawings. The drawings are only for purposes of illustrating the preferred embodiments of the present application and are not to be construed as limiting the application. Like parts or elements are designated with like reference numerals throughout the drawings.

The advantages and benefits of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The following examples are merely for illustrating the technical solutions of the present application more clearly, and therefore are exemplary and do not limit the scope of the claims of the present application.

It should be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which embodiments of the present application pertain.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for convenience in describing the embodiments of the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In addition, in the description of the embodiments of the present application, "at least one" means that one or more than one may be used; the meaning of "a plurality" is two or more unless specifically limited otherwise.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the manufacture of batteries, such as secondary batteries, a battery grouping process is included in which a plurality of battery cells are formed into a battery. At present, when cylindrical battery cells with lugs at two ends are grouped, for example, the following method is generally adopted: the lugs of the battery monomers are connected in series end to form a plurality of rows of battery monomers, the battery monomers in the plurality of rows are mutually connected in parallel to form a plurality of layers of battery monomers, and the plurality of layers of battery monomers can be stacked to form a battery meeting the requirements on energy and power. The cells arranged in an array are separated and supported by a support plate, and the plates of the support plate also have thermal management functions such as cooling or heating.

The heat exchange plate such as the cooling plate described above is, for example, formed to have a wavy plate surface, and is disposed on one side of the battery cells arranged in a layer so as to conform to the outer surface of, for example, a cylindrical battery cell. However, such a conventional heat exchange plate can exchange heat only by contacting the battery cells from one side or opposite sides of the battery cells, and therefore, for each battery cell, heat exchange is not uniform in the circumferential direction, which poses a risk in terms of the safety of the battery. Moreover, the contact area between the heat exchange plate and each battery cell is small, and it is desired in the industry to further improve the heat exchange efficiency.

In particular, in the cylindrical battery system, the conventional cooling plate can be attached to only a small portion of the 360 ° arc surface due to the characteristics of the cylindrical battery cell itself. The conventional design often causes the internal temperature distribution of the battery monomer to be unbalanced, and is easy to cause the problems of lithium precipitation and the like. Meanwhile, since the shape of the gap formed by the circular arcs between the adjacent battery cells is irregular, it is difficult to sufficiently utilize the gap. These problems present significant challenges to the thermal management of cylindrical battery systems.

In view of the above problems, the inventor of the present application finds, through research, that if the flexible heat exchange plates can be arranged around each battery cell to increase the heat exchange area with the battery cell, the heat exchange efficiency and the heat exchange effect of each battery cell are expected to be improved, and the safety is improved.

Therefore, in order to solve the above problems, the present application provides a thermal management system of a battery and a power consumption device.

The battery referred to herein may be any battery such as a battery module and a battery pack, or a primary battery and a secondary battery, for example, the secondary battery includes a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid (or lead storage) battery, a lithium ion battery, a sodium ion battery, a polymer battery, and the like. The battery is suitable for various electric equipment using the battery, such as mobile phones, portable equipment, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecrafts and the like, for example, the spacecrafts comprise airplanes, rockets, space shuttles, spacecrafts and the like; the battery is used for providing electric energy for the electric equipment.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described batteries and electric devices, but may also be applied to all batteries and electric devices using batteries, but for brevity of description, the following embodiments are all described by taking an electric vehicle as an example, but it is obvious that the application scenarios of the batteries related to the embodiments of the present application and the electric devices related to the embodiments of the present application are not limited to electric vehicles.

Fig. 1 is a schematic structural diagram of a vehicle 1000 according to an embodiment of the present application. As shown in fig. 1, the vehicle 1000 may be a fuel-oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or a range-extended vehicle. Vehicle 1000 carries battery 100, and battery 100 may be provided at the bottom, head, or tail of vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, wherein the controller 200 is configured to control the battery 100 to supply power to the motor 300, for example, the power may be used for starting, navigating, and operating power demand during driving of the vehicle 1000.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

In order to meet different power requirements, the battery 100 may include a plurality of battery cells 1, and the battery cells 1 refer to the smallest unit constituting a battery module or a battery pack. A plurality of battery cells 1 may be connected in series and/or in parallel via electrode terminals to be applied to various applications. The battery referred to in the present application may include a battery module or a battery pack. The plurality of battery cells 1 may be connected in series, in parallel, or in series-parallel, where series-parallel refers to a mixture of series connection and parallel connection. The battery in the embodiment of this application can directly constitute by a plurality of battery monomer 1, also can constitute battery module earlier, and battery module constitutes the battery again.

Fig. 2 schematically shows a schematic diagram of a battery cell according to an embodiment of the present application. In some embodiments, the battery cell 1 may be a lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell 1 may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells 1 are generally divided into three types in an encapsulated manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are not limited in the embodiment of the application. The cylindrical battery cells may be further classified into cylindrical battery cells, polygonal prismatic battery cells, and the like according to the cross-sectional shapes of the cylindrical surfaces, but for simplicity of description, the following embodiments are described by taking the cylindrical battery cell 1 as an example.

In addition, although not particularly illustrated, the battery cell 1 of the embodiment of the present application generally includes an end cap, a case, and an electric core assembly.

The end cap refers to a member that covers an opening of the case to insulate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap may be adapted to the shape of the housing to fit the housing. Optionally, the end cap may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap is not easily deformed when being extruded and collided, and the single battery 1 may have a higher structural strength and an improved safety performance. The end cap may be provided with functional components such as electrode terminals. The electrode terminals may be used to be electrically connected with the electric core assembly for outputting or inputting electric power of the battery cell 1. The end cap may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap, which may be used to isolate the electrical connections within the housing from the end cap to reduce the risk of shorting. Illustratively, the insulator may be plastic, rubber, or the like.

The housing is an assembly for mating with end caps to form an internal environment of the cell 1, wherein the formed internal environment may be used to house the cell assembly, electrolyte (not shown in the figures), and other components. The housing and the end cap may be separate components, and an opening may be formed in the housing, and the opening may be covered by the end cap to form an internal environment of the battery cell. The end cap and the housing may be integrated, and specifically, the end cap and the housing may form a common connecting surface before other components are inserted into the housing, and when the interior of the housing needs to be sealed, the end cap covers the housing. The housing may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing may be determined according to the specific shape and size of the electric core assembly. The material of the housing may be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this application. Since the embodiment of the present application is described by taking a cylindrical battery cell 1 as an example, the case of the battery cell 1 has a cylindrical shape, for example.

The cell assembly is a component in the battery cell 1 where electrochemical reactions occur. One or more electrical core assemblies may be contained within the housing. The cell assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the main body of the cell assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab (not shown in the drawings). The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. In the charging and discharging process of the battery, the anode active material and the cathode active material react with the electrolyte, and the tabs are connected with the electrode terminals to form a current loop.

Fig. 3 is a schematic plan view schematically illustrating a heat exchange case in a state in which a battery cell is placed according to an embodiment of the present application. Fig. 4 is a perspective view schematically illustrating a heat exchange box in a state in which a battery cell is placed according to an embodiment of the present application. Fig. 5 is a schematic plan view schematically illustrating a heat exchange box according to an embodiment of the present application. Fig. 6 is a sectional view schematically showing a heat exchange tank according to an embodiment of the present application.

As shown in fig. 3 to 6, a thermal management system for a battery provided by an embodiment of the present application includes a heat exchange box 2, the heat exchange box 2 has a first cavity 5 and at least one second cavity 6 that are not communicated with each other, the first cavity 5 is used for accommodating a heat exchange medium, the second cavity 6 is used for accommodating a battery cell 1, and the second cavity 6 is configured to be surrounded by the first cavity 5.

As the battery cell 1, for example, a cylindrical battery cell as described above is employed. As for the heat exchange case 2, it mainly provides a space for accommodating the heat exchange medium and the battery cells, and specifically, cavities for placing the batteries, i.e., second cavities 6 are formed in the case inner space of the heat exchange case 2, and these second cavities 6 are separated from other case inner spaces. The other space in the tank, i.e. the first cavity 5, may contain a heat exchange medium.

The number of the second cavities 6 formed in the heat exchange box 2 is not particularly limited, and may be one or more. The position of the second cavity 6 is not particularly limited, and the second cavity 6 may be provided so as to form an n × m array as shown in fig. 3 and 4, for example. The shape of the second cavity 6 is not particularly limited, and a battery cell can be preferably placed therein. The number of the battery cells 1 placed in each second cavity 6 may be 1 or several, but from the viewpoint of more effectively improving the heat exchange efficiency, it is preferable to place one battery cell 1 in each second cavity 6. For example, when the battery cell 1 is a cylindrical battery cell, the second cavity 6 may be formed in a cylindrical shape so as to accommodate the battery cell 1 with a suitable cavity space.

Because the second cavity 6 is surrounded by the first cavity 5 containing the heat exchange medium, the second cavity 6 can fully exchange heat with the heat exchange medium, so that heat management can be effectively carried out, the heat management efficiency is improved, and the use safety of the battery is improved.

As the cooling medium, a fluid cooling medium can be used, and specific examples thereof include cooling liquids such as water and ethylene glycol, air, tetrafluorohexane, trifluoromethane, difluoroethane, and the like.

As the material of the heat exchange box 2, for example, a plastic material having a certain elasticity, such as a thermosetting resin, a thermosetting plastic, TPU (polyurethanes), TPEE (polyesters), SBS (styrenes), TPV (vinyl chloride), and TPB (dienes), can be used.

In some embodiments, as shown in fig. 4 and 6, the heat exchange tank 2 comprises a tank bottom wall 21, tank side walls 22, 23 and a tank top wall 24. One end of the tank side walls 22, 23 is connected to the periphery of the tank bottom wall 24; the peripheral edge of the tank top wall 24 is connected to the other end portions of the first tank side wall 22 and the second tank side wall 23.

The top wall and the side walls are used herein for convenience of explanation of the positional relationship between the walls, and the placement direction of the heat exchange box 2 is not limited as long as the batteries can be reliably mounted and the batteries can be reliably thermally managed, and the placement direction of the heat exchange box 2 is not limited.

As shown in fig. 4, as a specific example, the heat exchange box 2 is a rectangular parallelepiped box shape as a whole, and in this case, the box side walls include a first box side wall 22 (opposite side not shown) and a second box side wall 23 (opposite side not shown) that are opposed to each other, and the first box side wall 22 and the second box side wall 23 enclose a space of the heat exchange box 2 whose both ends are open. As another specific example, the heat exchange tank 2 may be a cylindrical tank as a whole, in which case the tank side walls constitute the peripheral walls of the cylindrical tank.

In addition, the connection between the walls is liquid-tight or air-tight. Therefore, the box-shaped space of the heat exchange box is formed, the structure is simple, and the processing is easy.

In some embodiments, a plurality of through holes are opened in the top wall 24, and each of the second cavities 6 is communicated with the outside of the heat exchange tank 25 through the through hole 25.

Since the second cavity 6 for placing the battery cell 1 communicates with the outside of the heat exchange case 2, the battery cell 1 can be easily put in or taken out with respect to the second cavity 6.

In some embodiments, each second cavity 6 includes a bottom wall 26 and a side wall 27 connected to the bottom wall 26, and a bottomed cylindrical space surrounded by the bottom wall 26 and the side wall 27 constitutes the second cavity 6; each second cavity 6 is separated from the first cavity 5 by a bottom wall 26 and a side wall 27; the side walls 27 of the second cavities 6 are connected to the hole edges of the through-holes 25.

The bottom wall 26 and the side wall 27 of the second cavity 6 may be integrally connected, or may be connected by welding or the like. Therefore, the second cavity 6 can be formed in the space where the first cavity 5 is located in a simple structure, and the two cavities can be separated, so that the battery unit 1 placed in the second cavity 6 can be prevented from contacting with a heat exchange medium, and a proper working environment of the battery unit 1 can be ensured; and the battery cell 1 placed in the second cavity 6 can be held by a simple structure.

In some embodiments, the bottom wall 21, the side walls 22, 23 and the top wall 24 are all formed by sandwiching waterproof buffer material between the inner and outer walls.

Specifically, although not shown in the drawings, a sealing packing or the like may be filled between the inner box body formed by the inner walls of the box bottom wall 21, the box side walls 22 and 23, and the box top wall 24, and the outer box body formed by the outer walls thereof. Because each wall of the heat exchange box 2 is of a double-layer structure and the waterproof buffer material is clamped inside the heat exchange box, and the waterproof buffer material is supported by the waterproof buffer material, the supporting strength of each wall of the heat exchange box can be improved; the cushion has a buffer function, and can be applied to scenes such as vehicles and the like with impact, vibration and the like; in addition, because still have waterproof effect, consequently can prevent heat transfer medium's leakage or heat transfer case outside liquid such as rainwater, muddy water, cooling water from getting into heat transfer incasement portion.

In some embodiments, as shown in fig. 3, the heat exchange tank 2 is provided with a heat exchange medium input pipe 3 and a heat exchange medium output pipe 4, and the heat exchange medium input pipe 3 and the heat exchange medium output pipe 4 are respectively communicated with the first cavity 5.

From this not only can carry out the heat pipe reason with the heat transfer medium of saving in heat transfer case 2 to battery monomer 1, can also make the heat transfer medium circulation, cool off battery monomer 1 through endless heat transfer medium, consequently can obtain higher cooling efficiency and better cooling effect. In addition, the heat exchange medium (such as water) in the heat exchange box 2 can be drained according to needs, and the air in the heat exchange box 2 is used for preserving the heat of the battery monomer 1.

A second aspect of the present application provides an electric device including: a first aspect of the present application provides a thermal management system for a battery; and a battery cell 1 placed in a second cavity in the heat exchange box 2.

From this, because battery cell 1 is with the mode of soaking in heat transfer medium through the wall of second cavity 6 and carry out the heat transfer, consequently can carry out effectual heat transfer to battery cell, even also can carry out reliable heat transfer to battery cell under the scene of heat transfer medium circulation of not being convenient for. In addition, heat preservation can be carried out on the battery monomer placed in the second cavity by evacuating heat exchange media such as water in the first cavity. And further, the safety of the battery used by the electric device can be ensured under various environments.

In some embodiments, the walls 26, 27 that make up the second cavity 6 are in face contact with a portion of the outer surface of the battery cell.

The walls of the second cavity 6 comprise a bottom wall 26 and a side wall 27, and heat exchange can be more efficiently carried out through the surface contact of the walls of the second cavity and the outer surfaces of the battery cells, so that the heat exchange efficiency is improved. The surface contact here includes a case where the outer surface, particularly the outer peripheral surface of the battery cell is closely attached to the wall constituting the second cavity 6 over a large area (a high attachment of approximately 100%) and, in this case, the heat exchange efficiency can be further improved. Further, the bottom wall 26 and the side wall 27 are bonded to the end face and the peripheral face of the battery cell 1, whereby the supporting function for the battery cell can be improved.

In some embodiments, as shown in fig. 4, the second cavity 6 has an opening toward the outside of the heat exchange case 2, and the remaining portion other than a portion of the outer surface in the battery cell 1 is exposed from the opening.

Since a part of the single battery (in the example shown in fig. 4, an end face of the battery and the terminal provided on the end face) is exposed to the outside of the heat exchange box, the single battery 1 is conveniently taken and placed with respect to the second cavity 6, and is also conveniently electrically connected to the single battery 1 to extract electric energy from the single battery 1.

In some embodiments, as shown in fig. 2-4, the battery cell is a cylindrical battery cell.

Therefore, the cylindrical battery monomer 1 is effectively cooled, and the defects of difficult processing, uneven cooling and the like of the traditional cooling plate suitable for the cylindrical battery monomer are overcome.

Specific embodiments of the present application will be described below as examples.

As shown in fig. 6, the heat exchange tank 2 of the embodiment has a first cavity 5 and a plurality of second cavities 6 arranged in a 3 × 3 arrangement, which are not communicated with each other. The first cavity 5 is used for containing a heat exchange medium, the cylindrical battery cell 1 is placed in the second cavity 6, and the second cavity 6 is surrounded by the first cavity 5. The outer circumferential surface of the cylindrical battery cell 1 placed in the second cavity 6 is closely highly fitted to the side wall 27 of the second cavity 2, whereby heat is efficiently exchanged with the heat exchange medium via the side wall 27 while being supported by the side wall 27.

In addition, as shown in fig. 6, the waterproof and heat-insulating material is filled between the inner and outer double walls of the heat exchange box 2, so that on one hand, the strength of the box body is enhanced, on the other hand, the sealing effect can be achieved, the heat exchange between the inside of the heat exchange box 2 and the outside of the box can be reduced, the heat loss is reduced, and the heat-insulating effect can be achieved on the inside of the heat exchange box 2 in a low-temperature environment.

In addition, as shown in fig. 3 and 4, the heat exchange tank 2 is provided with a heat exchange medium input pipe 3 and a heat exchange medium output pipe 4, thereby enabling circulation of the heat exchange medium in the heat exchange tank 2. When the temperature of the battery monomer 1 is too high, the cooling medium in the heat exchange box 2 can flow circularly, so that the effect of reducing the temperature again can be achieved. When the ambient temperature of the battery is too low, heat exchange media such as water can be emptied, so that the heat preservation effect can be exerted through the box body of the heat exchange box 2 and the hollow structure in the box body.

Although the embodiments of the present application have been described above, it should be understood by those skilled in the art that the present application is not limited to the embodiments described above. The above embodiments are merely examples, and embodiments having substantially the same configuration as the technical idea and exhibiting the same operation and effect within the technical scope of the present application are all included in the technical scope of the present application. In addition, various modifications that can be conceived by those skilled in the art are applied to the embodiments and other embodiments are also included in the scope of the present application, in which some of the constituent elements in the embodiments are combined and constructed, without departing from the scope of the present application.

Claims (10)

1. The battery thermal management system is characterized by comprising a heat exchange box, wherein the heat exchange box is provided with a first cavity and at least one second cavity which are not communicated with each other, the first cavity is used for containing a heat exchange medium, the second cavity is used for containing a battery unit, and the second cavity is formed to be surrounded by the first cavity.

2. The battery thermal management system of claim 1,

the heat exchange box includes:

a bottom wall of the tank;

a box side wall, one end of which is connected with the periphery of the box bottom wall; and

a top box wall having a periphery connected to the other end of the side box wall.

3. The battery thermal management system of claim 2,

the top wall of the box is provided with a plurality of through holes, and the second cavities are respectively communicated with the outside of the heat exchange box through the through holes.

4. The battery thermal management system of claim 3,

each second cavity comprises a bottom wall and a side wall connected with the bottom wall, and a bottomed cylindrical space defined by the bottom wall and the side wall forms the second cavity;

each of the second cavities is separated from the first cavity by the bottom wall and the side wall;

the side wall of each second cavity is connected with the edge of the through hole.

5. The battery thermal management system of claim 2,

the bottom wall of the box, the side wall of the box and the top wall of the box are both structures formed by clamping waterproof buffer materials on the inner wall and the outer wall.

6. The battery thermal management system of claim 1,

the heat exchange box is provided with a heat exchange medium input pipe and a heat exchange medium output pipe, and the heat exchange medium input pipe and the heat exchange medium output pipe are respectively communicated with the first cavity.

7. An electric device, comprising:

a thermal management system for the battery of any one of claims 1 to 6; and

a battery cell disposed in the second cavity in the heat exchange box.

8. The power utilization device of claim 7,

the wall constituting the second cavity is in surface contact with a part of the outer surface of the battery cell.

9. The power utilization device of claim 8,

the second cavity has an opening towards the outside of the heat exchange box,

the remaining portion of the battery cell other than a portion of the outer surface is exposed from the opening.

10. The power utilization device of claim 7,

the battery monomer is a cylindrical battery monomer.

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