CN219180602U - Heat conduction assembly and battery pack with same - Google Patents

Abstract

The application relates to a heat conduction assembly and a battery pack with the same, wherein the heat conduction assembly comprises a heat conduction bracket, a heating film and a plurality of heat conduction substrates, and the heat conduction bracket comprises a first side surface and a second side surface which are opposite; the heating film can rise in temperature and is connected to the first side surface; each heat conducting substrate is connected to the heat conducting bracket through a heat conducting pipe, the plurality of heat conducting substrates are distributed at equal intervals along the second side face, each heat conducting substrate comprises two heat conducting faces which are opposite to each other, and the two heat conducting faces are perpendicular to the second side face; in the above-mentioned scheme, through setting up the heating membrane for when needs to heat the electric core, through heating membrane temperature rise with heat transfer to the heat conduction support, a plurality of heat conduction base plates connect respectively in different electric cores, and a plurality of heat conduction base plates equidistant distribution is in order to dispel the heat or heat the electric core equidistant, thereby avoid the intermediate position heat of the battery package among the prior art big, the little uneven problem of heat dissipation of both ends position heat.

Description

Heat conduction assembly and battery pack with same

Technical Field

The application relates to the technical field of new energy batteries, in particular to a heat conduction assembly and a battery pack with the heat conduction assembly.

Background

With the continuous improvement of new energy technology and battery cell technology, the whole vehicle has higher endurance and dynamic performance, the vehicle has larger and larger charge and discharge multiplying power under different working conditions, the heating value is continuously improved, and meanwhile, the requirement on charge and discharge performance under a low-temperature environment is also continuously improved, so that the heat dissipation performance of a battery pack is also gradually improved. Because the module cells are basically arranged in rows in the battery pack, the heat quantity of the middle position of the battery pack is large, and the two ends of the battery pack are relatively smaller, so that the temperature difference between the module cells is large. The environment where the battery pack is located is complex and changeable, the battery pack is required to efficiently dissipate heat at high temperature, and the temperature is efficiently raised at low temperature, and the heat conduction assembly in the prior art cannot meet the requirements of refrigeration and heating.

Disclosure of Invention

Based on this, it is necessary to provide a heat conduction component and a battery pack with the heat conduction component, and the problem that the heat dissipation of the battery pack is uneven and the refrigeration and heating requirements cannot be met in the prior art is solved.

In a first aspect, the present application provides a thermally conductive assembly comprising a thermally conductive holder, a heating film, and a plurality of thermally conductive substrates, the thermally conductive holder comprising first and second opposite sides; the heating film can be heated up and connected to the first side; each heat conducting substrate is connected to the heat conducting support through a heat conducting pipe, a plurality of heat conducting substrates are distributed at equal intervals along the second side face, each heat conducting substrate comprises two heat conducting faces which are opposite to each other, and the two heat conducting faces are perpendicular to the second side face.

In the scheme, the heating film is arranged, so that when the electric core needs to be heated, heat is transferred to the heat conduction bracket through the temperature rise of the heating film. The heating film is connected to the first side surface of the heat conduction support, so that the problems of short circuit, overburning and the like of the battery core caused by direct contact of the heating film with the battery core are avoided. And the plurality of heat conducting substrates are distributed at equal intervals, so that the plurality of heat conducting substrates are respectively connected to different electric cores, and the plurality of heat conducting substrates are distributed at equal intervals to radiate or heat the electric cores at equal intervals, thereby avoiding the uneven heat radiation problem that the heat quantity of the middle position of the battery pack in the prior art is large and the heat quantity of the two ends of the battery pack is small.

In one embodiment, the heat conducting pipe comprises a first end and a second end, the second side surface of the heat conducting bracket is provided with a plurality of mounting holes, the first end is at least partially inserted into the mounting holes, and the second end is embedded between the two heat conducting surfaces of the heat conducting substrate.

In one embodiment, the mounting hole penetrates through the heat conducting support, the first end is inserted into the heat conducting support from the second side face to the first side face in a penetrating mode, the heating film is partially hollowed out, and when the heating film is connected to the first side face, the heating film is arranged around the mounting hole.

In one embodiment, the second end is in a flat structure, a hole for connecting the second end is arranged between the two heat conducting surfaces of the heat conducting substrate, and the hole is arranged along the direction perpendicular to the second side surface.

In one embodiment, each of the heat conducting substrates is connected to the heat conducting bracket through a plurality of heat conducting pipes, and the plurality of heat conducting pipes are distributed at equal intervals along the heat conducting surface.

In one embodiment, the two heat conducting surfaces of the heat conducting substrate are both provided with heat conducting glue.

In one embodiment, the thickness of the heat conductive paste is 0.5mm to 1mm.

In one embodiment, the heating film is connected to the heat conducting bracket through colloid.

In a second aspect, the application further provides a battery pack, including any of the above embodiments, the battery pack further includes a lower case having a containing cavity, an upper cover covering the lower case, a plurality of electric cores and the heat conducting component are all located in the containing cavity, and adjacent electric cores are all provided with the heat conducting substrate and connect in the heat conducting surface, the heat conducting support with the heat conducting substrate is all perpendicular to the setting of lower case.

In one embodiment, a heat insulation pad is arranged between the battery cell and the lower box body.

In one embodiment, the battery cells connected to the same heat conducting support through the heat conducting substrate form a battery cell module, a plurality of battery cell modules are arranged in the battery pack, and each battery cell module is connected with the corresponding heat conducting module.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application.

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

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

FIG. 2 is a schematic view of the heat conduction assembly of FIG. 1;

FIG. 3 is a schematic view of the heat pipe in FIG. 2;

FIG. 4 is a side view of the thermally conductive holder and heating film of FIG. 3;

fig. 5 is a schematic diagram of the thermally conductive substrate connection cell of fig. 3.

Reference numerals illustrate:

100. a battery pack; 110. a lower box body; 120. an upper cover; 130. a battery cell module; 131. a battery cell; 140. a cold plate; 150. a heat conducting component; 151. a thermally conductive bracket; 1511. a first side; 1512. a second side; 1513. a mounting hole; 152. heating the film; 153. a thermally conductive substrate; 1531. a heat conducting surface; 154. a heat conduction pipe; 1541. a first end; 1542. a second end; 155. a heat-conducting adhesive; 160. and a heat insulation pad.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other ways than those herein described and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not limited to the specific embodiments disclosed below.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Preferred embodiments of the present application will be described below with reference to the accompanying drawings.

As shown in fig. 1, a battery pack 100 according to an embodiment of the present application includes a case, a heat conducting assembly 150 and a plurality of electric cells 131, the case includes a lower case 110 and an upper cover 120, the upper cover 120 covers the lower case 110 with a receiving cavity, and the upper cover 120 and the lower case 110 together define a receiving cavity for receiving the electric cells 131 and the heat conducting assembly 150. Wherein the heat conduction assembly 150 is the heat conduction assembly 150 in any of the following embodiments. In some embodiments, the lower case 110 is welded with a plurality of reinforcing ribs for improving the load bearing capacity.

As shown in fig. 2 to 5, a heat conducting assembly 150 according to an embodiment of the present application includes a heat conducting bracket 151, a heating film 152 and a plurality of heat conducting substrates 153, wherein the heat conducting bracket 151 and the heat conducting substrates 153 have heat conducting properties.

As shown in fig. 2 and 3, the heat conductive bracket 151 includes a first side 1511 and a second side 1512 opposite to each other, alternatively, as shown in fig. 2 and 3, the heat conductive bracket 151 is in a rectangular parallelepiped structure, where the first side 1511 and the second side 1512 are two sides of a larger area of the heat conductive bracket 151. Preferably, as shown in fig. 2 and 3, the inside of the heat conductive bracket 151 is provided with a plurality of through grooves parallel to the first side 1511 and the second side 1512 to reduce the weight of the heat conductive bracket 151, thereby reducing the weight of the battery pack 100. Alternatively, in the present embodiment, the heat conductive bracket 151 is made of an aluminum material, and in other embodiments, other materials having heat conductive properties may be used.

As shown in fig. 1, the heating film 152 is capable of being heated and connected to the first side 1511, and in this embodiment, the heating film 152 is a PI (polyimide) film, which is a flexible material. Optionally, according to some embodiments of the present application, the heating film 152 is connected to the thermally conductive holder 151 by a glue. Preferably, a back adhesive is disposed on a surface of the heating film 152 connected to the heat conductive bracket 151, so as to adhere the heating film 152 to the first side 1511 of the heat conductive bracket 151. By attaching the heating film 152 to the first side 1511 of the thermally conductive holder 151, when it is desired to heat the battery cell 131, heat is transferred to the thermally conductive holder 151 by the temperature increase of the heating film 152. Meanwhile, the problems of short circuit, overburning and the like of the battery cell 131 caused by the fact that the heating film 152 directly contacts the battery cell 131 are avoided.

As shown in fig. 2 to 3, each of the heat conductive substrates 153 is connected to the heat conductive bracket 151 through a heat conductive pipe 154, and a liquid is provided in the heat conductive pipe 154 and flows inside the heat conductive pipe 154. And the liquid evaporates to absorb heat and becomes gaseous, and the gaseous cryocondense into liquid, thereby realizing heat transfer inside the heat transfer tube 154. The plurality of heat conducting substrates 153 are distributed along the second side 1512 at equal intervals, so that the plurality of heat conducting substrates 153 are respectively connected to different electric cores 131, and the plurality of heat conducting substrates 153 are distributed at equal intervals to uniformly radiate or heat the electric cores 131, thereby avoiding the uneven heat radiation problem that the heat quantity at the middle position of the battery pack in the prior art is large and the heat quantity at the two ends is small.

As shown in fig. 3, the heat conducting tube 154 has a straight tube structure, and is directly connected with the heat conducting substrate 153 and the heat conducting bracket 151, so as to avoid the influence of the bending and longer length of the heat tube on the heat dissipation performance.

The heat conducting substrate 153 includes two opposite heat conducting surfaces 1531 for respectively connecting different electric cores 131 to dissipate heat from two adjacent electric cores 131. Both heat conducting surfaces 1531 are perpendicular to the second side 1512 so that when the heat conducting substrate 153 is inserted between two adjacent battery cells 131, the heat conducting bracket 151 can stand on one side of the battery cells 131, thereby avoiding the heat conducting bracket 151 from excessively occupying the internal space of the battery pack 100.

As shown in fig. 3, optionally, according to some embodiments of the present application, the heat conductive tube 154 includes a first end 1541 and a second end 1542, the second side 1512 of the heat conductive bracket 151 is provided with a plurality of mounting holes 1513, and the first end 1541 is at least partially inserted into the mounting holes 1513 to connect the heat conductive bracket 151, as shown in fig. 3 and 5, with the second end 1542 being embedded between the two heat conductive surfaces 1531 of the heat conductive substrate 153. As shown in fig. 3, a plurality of holes for connecting the heat conductive pipes 154 are provided between the two heat conductive surfaces 1531 of the heat conductive substrate 153, the holes being disposed in a direction perpendicular to the second side surface 1512.

Optionally, according to some embodiments of the present application, the mounting hole 1513 extends through the thermally conductive holder 151, and the first end 1541 extends through the thermally conductive holder 151 from the second side 1512 to the first side 1511. Preferably, as shown in fig. 4, when the heating film 152 is connected to the first side 1511, the heating film 152 is disposed around the mounting hole 1513, so as to avoid the mounting hole 1513, and the inconvenience in mounting the heat conducting tube 154 caused by the heating film 152 blocking the mounting hole 1513 is avoided.

As shown in fig. 3 and 5, according to some embodiments of the present application, the second end 1542 may be optionally in a flat structure, so as to fix the heat conducting tube 154, and also increase the contact area between the heat conducting tube 154 and the heat conducting substrate 153, so as to improve the heat transfer efficiency between the heat conducting tube 154 and the heat conducting substrate 153.

As shown in fig. 3 and 5, according to some embodiments of the present application, optionally, each heat conducting substrate 153 is connected to the heat conducting bracket 151 through a plurality of heat conducting pipes 154, and the plurality of heat conducting pipes 154 are distributed at equal intervals along the heat conducting surface 1531, so that heat transfer between the heat conducting surface 1531 and the heat conducting pipes 154 is uniform, and uneven temperatures at different positions on the same heat conducting surface 1531 are avoided. In the present embodiment, each of the heat conductive substrates 153 is connected to the heat conductive bracket 151,4 through four heat conductive pipes 154 and is equally spaced apart from the heat conductive pipes 154.

As shown in fig. 5, according to some embodiments of the present application, optionally, two heat conducting surfaces 1531 of the heat conducting substrate 153 are both provided with heat conducting glue 155 to connect the battery cells 131, so that heat exchange between the battery cells 131 and the heat conducting surfaces 1531 of the heat conducting substrate 153 is achieved, and meanwhile, the heat conducting glue 155 has a certain buffering capacity and can absorb expansion force between the battery cells 131. Meanwhile, the adjacent battery cells 131 are fixedly connected through the heat conduction assembly 150, so that the mechanical strength is high, and vibration and impact are resisted.

According to some embodiments of the present application, the thickness of the heat conductive glue 155 is optionally 0.5mm to 1mm, so as to avoid the thermal contact resistance caused by the large thickness of the heat conductive glue 155.

As shown in fig. 1, a plurality of electric cells 131 and a heat conducting component 150 in the battery pack 100 are all located in the accommodating cavity, and a heat conducting substrate 153 is arranged between adjacent electric cells 131 and connected to a heat conducting surface 1531 of the heat conducting substrate 153, so as to uniformly radiate or heat the electric cells 131, thereby avoiding the uneven heat radiation problem that the heat quantity at the middle position is large and the heat quantity at the two ends is small in the battery pack 100 in the prior art. As shown in fig. 1, the larger area side of the battery cell 131 is connected to the heat conducting surface 1531, so that the two are in large contact, thereby improving heat dissipation efficiency.

The heat conducting bracket 151 and the heat conducting substrate 153 are both perpendicular to the lower case 110, so that no additional space is required for the heat conducting component 150, the space at the top of the battery cell 131 is not occupied, and the whole package height is not increased.

According to some embodiments of the present application, optionally, the lower case 110 includes a cold plate 140, and the cold plate 140 is located inside the lower case 110 and in contact with the heat conductive bracket 151, and has a heat conductive property to transfer heat of the heat conductive bracket 151 to the lower case 110 and the outside.

As shown in fig. 1, according to some embodiments of the present application, a heat insulation pad 160 is optionally disposed between the battery cell 131 and the lower case 110 to insulate heat, so as to realize heat preservation in a low-temperature environment, prevent the external environment temperature or the bottom local cold/hot spot of the lower case 110 from affecting the battery cell 131, and ensure the heat transfer direction from the battery cell 131 to the heat conduction assembly 150 to the cold plate 140 and the lower case 110.

According to some embodiments of the present application, optionally, the battery cells 131 connected to the same heat conductive bracket 151 through the heat conductive substrate 153 form a battery cell module 130, and a plurality of battery cell modules 130 are disposed inside the battery pack 100, and each battery cell module 130 is connected to a corresponding heat conductive component 150. It is understood that the plurality of electric cells 131 may be connected in series, parallel, or a series-parallel connection, where a series-parallel connection refers to that the plurality of electric cells 131 are connected in series or parallel. The plurality of battery cells 131 may be connected in series or parallel or in series-parallel to form the battery cell module 130, and the plurality of battery cell modules 130 are connected in series or parallel or in series-parallel to form a whole and are accommodated in the accommodating cavity. In other embodiments, all the electric cells 131 may be directly connected in series, parallel, or a combination thereof, and then the whole of all the electric cells 131 may be accommodated in the accommodating cavity.

In the heat conducting assembly 150 provided in the above-mentioned scheme, when the battery pack 100 needs to dissipate heat, the battery core 131 heats, the heat is transferred to the heat conducting substrate 153 through the heat conducting glue 155, the heat is transferred to the heat conducting tube 154 connected with the heat conducting substrate 153 after being heated, the liquid inside the second end 1542 of the heat conducting tube 154 is heated and absorbs the heat, the liquid evaporates into a gaseous state and moves towards the first end 1541, the liquid moves to the first end 1541 because of the heat exchange between the heat conducting tube 154 and the heat conducting bracket 151, the gaseous liquid at the first end 1541 is condensed into a liquid state, the heat conducting bracket 151 is heated, and the heat of the heat conducting bracket 151 is transferred to the outside of the battery pack 100 through the cold plate 140 and the lower box 110. While the liquid at first end 1541 flows to second end 1542 by capillary action, and continues to circulate, completing the heat dissipation of battery pack 100.

When the battery pack 100 needs to be heated, current passes through the heating film 152, the heating film 152 rapidly heats up, and the heat of the heating film 152 is conducted to the heat conducting bracket 151. The heated liquid at the first end 1541 of the heat pipe 154 evaporates, then moves toward the second end 1542 and transfers heat to the heat conductive substrate 153, and the heat at the heat conductive substrate 153 is transferred to the cell 131 through the heat conductive adhesive 155, so as to heat the cell 131.

In the above-described scheme, by providing the heating film 152, when the battery cell 131 needs to be heated, heat is transferred to the heat conductive bracket 151 by the temperature increase of the heating film 152. Connecting the heating film 152 to the first side 1511 of the thermally conductive holder 151 also avoids the problems of short circuit, overburning, etc. of the battery cell 131 caused by direct contact of the heating film 152 with the battery cell 131. The plurality of heat conducting substrates 153 are arranged at equal intervals, so that the plurality of heat conducting substrates 153 are respectively connected to different battery cells 131, and the plurality of heat conducting substrates 153 are distributed at equal intervals to uniformly radiate or heat the battery cells 131, so that the problem of uneven heat radiation caused by large heat quantity at the middle position and small heat quantity at the two ends of the battery pack in the prior art is avoided.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (11)

1. A thermally conductive assembly, comprising:

the heat conduction bracket comprises a first side surface and a second side surface which are opposite;

a heating film capable of temperature elevation and connected to the first side;

the heat conducting substrates are connected to the heat conducting support through heat conducting pipes and distributed at equal intervals along the second side face, each heat conducting substrate comprises two opposite heat conducting faces, and the two heat conducting faces are perpendicular to the second side face.

2. The heat transfer assembly of claim 1, wherein the heat transfer tube comprises a first end and a second end, the second side of the heat transfer bracket is provided with a plurality of mounting holes, the first end is at least partially inserted into the mounting holes, and the second end is embedded between the two heat transfer surfaces of the heat transfer substrate.

3. The heat transfer assembly of claim 2, wherein the mounting hole extends through the heat transfer bracket, the first end extends through the heat transfer bracket from the second side to the first side, the heating film is partially hollowed out, and the heating film is disposed around the mounting hole when the heating film is connected to the first side.

4. A heat transfer assembly according to claim 2 or 3, wherein the second end is of a flat configuration, and a hole for connecting the second end is provided between the two heat transfer surfaces of the heat transfer substrate, the hole being arranged in a direction perpendicular to the second side surface.

5. The heat transfer assembly of claim 1, wherein each of the heat transfer substrates is connected to the heat transfer bracket by a plurality of heat transfer tubes equally spaced along the heat transfer surface.

6. The heat transfer assembly of claim 1, wherein both of the heat transfer surfaces of the heat transfer substrate are provided with a heat transfer gel.

7. The heat transfer assembly of claim 6, wherein the thickness of the heat transfer paste is 0.5mm to 1mm.

8. The heat transfer assembly of claim 1, wherein the heating film is attached to the heat transfer bracket by a glue.

9. The battery pack is characterized by comprising the heat conduction assembly according to any one of claims 1 to 8, and further comprising a lower box body with a containing cavity, an upper cover covered on the lower box body, a plurality of electric cores, wherein the electric cores and the heat conduction assembly are all located in the containing cavity, heat conduction substrates are arranged between adjacent electric cores and are connected to the heat conduction surfaces, and the heat conduction supports and the heat conduction substrates are all perpendicular to the lower box body.

10. The battery pack of claim 9, wherein a heat insulating pad is disposed between the cell and the lower case.

11. The battery pack according to claim 9, wherein the battery cells connected to the same heat conducting bracket through the heat conducting substrate form a battery cell module, a plurality of battery cell modules are arranged in the battery pack, and each battery cell module is connected to the corresponding heat conducting module.

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