CN213752916U

CN213752916U - Tray assembly and battery pack

Info

Publication number: CN213752916U
Application number: CN202023166564.2U
Authority: CN
Inventors: 郭舒; 鲁志佩; 彭青波; 唐江龙
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-07-20
Anticipated expiration: 2030-12-24

Abstract

The utility model provides a battery package and tray subassembly thereof, tray subassembly is used for holding electric core, and it includes heat preservation, bottom plate, heating structure and the insulating layer of range upon range of setting, and heating structure locates bottom plate electric core one side towards the battery package, and the heat preservation is used for keeping warm. Through setting up heat preservation, bottom plate, heating structure and the insulating layer of range upon range of setting up, integrated the heating structure and the heat retaining heat preservation that are used for heating electric core on the bottom plate, do not need additionally to set up PI heating film and fixed knot structure again, reduced the holistic thermal management cost of battery package, reduced the space occupancy simultaneously, because integrated tray subassembly has contained the heating structure, do not need the assembly many times, still reduced the assembly complexity of battery package.

Description

Tray assembly and battery pack

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a tray subassembly and battery package.

Background

New energy automobiles are rapidly developed in recent years and widely applied all over the world. The core of a new energy automobile is a battery pack, and when the new energy automobile is used in a low-temperature environment such as a high-altitude area and winter, the battery pack is generally required to be heated in order to improve the performance of the battery pack.

The existing heating scheme for the battery pack is mainly to arrange a PI (Polyimide) heating film on the surface of the battery pack. Because the PI heating film is of a flexible structure, a fixing structural part needs to be additionally arranged, and therefore the overall heat management cost of the battery pack is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a tray subassembly and battery package solve the problem that the holistic thermal management of battery package is with high costs.

For realizing the purpose of the utility model, the utility model provides a following technical scheme:

in a first aspect, the utility model provides a tray assembly for holding electricity core, heat preservation, bottom plate, heating structure and insulating layer including range upon range of setting, heating structure locates the bottom plate orientation electricity core one side.

In one embodiment, the tray assembly further includes an adhesive layer, the adhesive layer is connected to the base plate, and the heat generating structure is formed on the adhesive layer.

In one embodiment, the heating structure includes a heating layer and a heat conducting layer that are connected to each other on the same layer, the heating layer includes a hollow space, and the heat conducting layer is accommodated in the hollow space.

In one embodiment, the heat conducting layer is made of any one of graphene, a graphene composite material and carbon nanotubes, and the heat conductivity of the heating layer is smaller than that of the heat conducting layer.

In one embodiment, the insulating layer is a thermal conductive insulating layer fabricated by a printing or spraying process.

In one embodiment, the heat generating structure is a heat conducting layer with a thermal conductivity not lower than a preset thermal conductivity, wherein the preset thermal conductivity is greater than or equal to 1000 w/m.k.

In one embodiment, the tray assembly further comprises a protective layer, and the protective layer is arranged on one side, opposite to the bottom plate, of the heat preservation layer.

In one embodiment, a closed gap is formed between the protective layer and the bottom plate, and the insulating layer is air in the gap, or the insulating layer is filled in the gap.

In one embodiment, the insulating layer has a plurality of insulating regions, and the insulating properties of the plurality of insulating regions are not all the same, so that the temperatures of different positions of the battery cell are the same.

In a second aspect, the embodiment of the present invention further provides a battery pack, including any one of the various embodiments of electric core and the first aspect, the tray assembly includes a boundary beam and a bottom plate that enclose and form an accommodating space, the electric core is accommodated in the accommodating space.

Through setting up heat preservation, bottom plate, heating structure and the insulating layer of range upon range of setting up, integrated the heating structure and the heat retaining heat preservation that are used for heating electric core on the bottom plate, do not need additionally to set up PI heating film and fixed knot structure again, reduced the holistic thermal management cost of battery package, still reduced the space occupancy simultaneously, because integrated tray assembly has contained heating structure, do not need repetitious assembly, still reduced the assembly complexity of battery package.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of a partially exploded structure of a battery pack according to an embodiment;

FIG. 2 is a schematic plan view of a heating layer and a heat conducting layer according to an embodiment;

fig. 3 is a schematic plan view of another embodiment of a heating layer and a heat conductive layer;

fig. 4 is a schematic sectional view of a battery pack according to an embodiment;

fig. 5 is a schematic sectional view of a battery pack according to another embodiment;

fig. 6 is an exploded view of a battery pack according to an embodiment;

fig. 7 is an exploded structure view of a battery pack according to an embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

Referring to fig. 1, an embodiment of the present invention provides a tray assembly 10 for accommodating a battery cell 20, where the tray assembly 10 includes a heat insulating layer 16, a bottom plate 11, a heating structure and an insulating layer 15, which are stacked, and the heating structure is disposed on one side of the battery cell 20, which faces a battery pack, of the bottom plate 11. The insulating layer 15 is used to insulate the heating structure from the outside, and the insulating layer 16 is used to insulate heat.

Specifically, the tray assembly 10 is used for supporting the battery cell 20 of the battery pack, and generally includes the boundary beam 25 besides the aforementioned various structures, the boundary beam 25 is multiple and encloses an accommodating space, the accommodating space is used for accommodating the battery cell 20, the bottom of the boundary beam has a protruding bearing portion, the bearing portion is used for bearing the battery cell 20, the bearing portion is further connected to the bottom plate 11 of this embodiment, the bottom plate 11 is used for sealing one side of the accommodating space, and the other side of the accommodating space is sealed by a cover plate (not shown in the figure), so as to form an integral battery pack structure.

The bottom plate 11 is made of a metal material, and the thickness of the bottom plate 11 can be adaptively set according to different metal materials in order to meet the strength requirement. Taking the material of the bottom plate 11 as aluminum for example, the thickness of the bottom plate 11 can be 1mm-3 mm; taking the material of the bottom plate 11 as steel as an example, the thickness of the bottom plate 11 can be 0.8mm-1 mm; of course, the material of the bottom plate 11 may be other metal materials, and the thickness thereof is set according to the strength requirement, which is not enumerated here.

The heat-generating structure may be any feasible structure, and the specific structure of the heat-generating structure is not expanded here, and the following description will be provided in terms of several specific embodiments.

The insulating layer 15 is used to insulate the heating structure and the space between the base plate 11 and the battery cell 20, has a good voltage resistance, and can be applied to the heating structure and the base plate 11 at the periphery of the heating structure by using materials such as epoxy resin and boron nitride through processes such as printing or spraying. The thickness of the insulating layer 15 may be 50 μm to 200 μm. Optionally, the insulating layer 15 has a heat conducting property, and further, the insulating layer 15 may be further connected to the battery cell 20 through a heat conducting structural adhesive, so that heat transfer may be accelerated.

The utility model discloses a tray assembly, through heat preservation 16, bottom plate 11, the heating structure and the insulating layer 15 that set up range upon range of setting, integrated heating structure and the heat retaining heat preservation 16 that is used for heating electric core 20 on bottom plate 11, need not additionally set up PI heating film and fixed knot structure again, reduced the holistic thermal management cost of battery package. While also reducing space usage, because the integrated tray assembly 10 includes a heating structure, multiple assembly is not required, and the assembly complexity of the battery pack is reduced.

In one embodiment, the tray assembly further comprises an adhesive layer 12, the adhesive layer 12 is connected to the base plate 11, and the heat generating structure is formed on the adhesive layer 12.

The adhesive layer 12 is an adhesive with high adhesion performance and insulation, specifically can be a Polyurethane (PU) polymer material, has the advantages of adjustable modulus range, moderate curing speed and low cost, and can connect the bottom plate 11 with the metal of the heating structure in a high-strength manner.

The existing PI heating film is generally structured by sandwiching a heating structure between two insulating layers. The utility model discloses an in the embodiment, can with current PI heat the membrane through pasting layer 12 adhere to bottom plate 11 on, also can realize better heating and heat preservation effect.

In one embodiment, referring to fig. 1 and fig. 2, the heat generating structure includes a heating layer 13 and a heat conducting layer 14 disposed in the same layer, and the heating layer 13 and the heat conducting layer 14 are connected.

Specifically, the heating layer 13 is made of a high-resistance material, and generates heat by using a resistance heating principle. The material of the heating layer 13 may be copper, steel, PTC heater, etc., and the resistance value thereof is set according to the required heating power, and is not particularly limited.

The heat conducting layer 14 serves to conduct heat, i.e. to conduct the heat of the heating layer 13 over a larger area. The heat conduction layer 14 may be made of a material having a higher thermal conductivity than the heating layer 13, and optionally, the material of the heat conduction layer 14 is any one of graphene, a graphene composite material, and carbon nanotubes, and the thermal conductivity of these materials is higher than that of a general metal heat conduction material. For the carbon nanotube, the thermal conductivity is lower than that of the graphene and the graphene composite material, but the carbon nanotube as the heat conduction layer 14 can generate and conduct heat, that is, not only can the heat of the heating layer 13 be conducted out, but also the carbon nanotube itself can generate heat.

The heat conducting layer 14 is connected with the heating layer 13, in one embodiment, the two layers are in physical contact, no current can flow, and the heat of the heating layer 13 is conducted to the heat conducting layer 14 through the contact position of the two layers; another embodiment is that the two are electrically connected, i.e. there is a current flowing between them, and the heat conducting layer 14 can also be excited by the current to generate heat, i.e. the heat conducting layer 14 generates heat and conducts heat simultaneously, and then the heat conducted by the heating layer 13 is superimposed, so that the temperature can be raised more quickly.

In this embodiment, the heating layer 13 and the heat conduction layer 14 are arranged on the same layer, so that the occupied space in the thickness direction can be reduced, the heating layer 13 and the heat conduction layer 14 can cover a larger area as a whole, and the temperature uniformity is also well affected.

The specific structure of the same layer arrangement of the heating layer 13 and the heat conduction layer 14 can be any feasible structure, for example, the heating layer 13 is on one side, and the heat conduction layer 14 is on the other side, and some embodiments are also given below, and will not be described in detail here. The heating layer 13 and the heat conducting layer 14 can be formed on the sticking layer 12 through etching or die cutting, the process is mature, the formed structure is uniform, the extremely small size interval can be carved, and the sudden change of the local heating and temperature equalizing effects can be reduced conveniently.

In one embodiment, referring to fig. 1 and 2, the heating layer 13 includes a hollow space 136, and the heat conducting layer 14 is accommodated in the hollow space 136. In other words, the heating layer 13 surrounds the heat conductive layer 14, and the heating layer 13 can conduct heat from the periphery of the heat conductive layer 14 to the heat conductive layer 14, so that the temperature of the heat conductive layer 14 can be made uniform.

In one embodiment, referring to fig. 1 to 3, the heating layer 13 includes a positive electrode connecting portion 131, a negative electrode connecting portion 132 and a branch connecting portion 133 enclosing a hollow space 136, and the heat conducting layer 14 is accommodated in the hollow space 136. In other words, the heating layer 13 surrounds the heat conductive layer 14, and the heating layer 13 can conduct heat from the periphery of the heat conductive layer 14 to the heat conductive layer 14, so that the temperature of the heat conductive layer 14 can be made uniform. In an embodiment where the thermally conductive layer 14 can heat and conduct heat simultaneously, current flows from the positive electrode connection portion 131 into the branch connection portion 133 or the thermally conductive layer 14, and flows back through the thermally conductive layer 14 or the branch connection portion 133 into the negative electrode connection portion 132.

In an embodiment, referring to fig. 1 to fig. 3, the number of the branch connection portions 133 is multiple, the branch connection portions 133 are disposed between the positive connection portion 131 and the negative connection portion 132, the positive connection portion 131, the negative connection portion 132 and the branch connection portions 133 enclose a plurality of hollow spaces 136, the number of the heat conduction layers 14 is multiple, the heat conduction layers 14 are correspondingly disposed in the hollow spaces 136, a coverage area of the heat conduction layers 14 is larger than a coverage area of the branch connection portions 133, and the coverage area refers to an area of a vertical projection on the substrate 11. Because the even effect of heat conduction layer 14 to the temperature is better, so set up a plurality of heat conduction layers 14, and the area covered of a plurality of heat conduction layers 14 is bigger, can promote the holistic samming effect of zone of heating 13 and heat conduction layer 14.

In one embodiment, referring to fig. 1 to 3, the positive electrode connecting portion 131 and the negative electrode connecting portion 132 may extend along the first direction X and are disposed parallel to each other. The plurality of branch connection parts 133 are disposed at intervals, and the plurality of branch connection parts 133 are parallel to each other, so that the plurality of hollow spaces 136 are sequentially arranged at intervals in the first direction X. In the first direction X, the dimension W1 of the heat conductive layer 14 is greater than the dimension W2 of the branch connection portion 133 adjacent thereto, and the dimension W2 of the branch connection portion 133 in the first direction is the separation distance between two adjacent hollow spaces 136. The shape of the hollowed-out space 136 and the heat conductive layer 14 are completely matched, and optionally, the hollowed-out space 136 and the heat conductive layer 14 are both rectangular.

Alternatively, as shown in fig. 2, in the first direction X, the dimension W1 of the plurality of heat conduction layers 14 may be the same, and the plurality of heat conduction layers 14 may be arranged at equal intervals, that is, the dimension W2 of the plurality of branch connection portions 133 may also be the same. Further, the dimension W2 of each heat conductive layer 14 in the first direction X may be greater than twice the dimension W2 of the branch connection portion 133 adjacent thereto.

Alternatively, as shown in fig. 2 and 3, the dimension W1 of the heat conductive layers 14 in the first direction X may vary regularly, such as decreasing or increasing. The dimension W2 of the plurality of branch connecting portions 133 may be the same or different.

By setting the dimension W1 of the heat conduction layer 14 in the first direction X to be larger than the dimension W2 of the branch connection portion 133 adjacent to the heat conduction layer 14, the coverage area of the heat conduction layer 14 is larger than the coverage areas of the plurality of branch connection portions 133, and by such setting, the temperature equalization performance of the heat conduction layer 14 can be fully utilized, and the overall heating and temperature equalization effects of the heating layer 13 and the heat conduction layer 14 are improved.

In one embodiment, referring to fig. 1 to 3, the branch connection portions 133 include adjacent first branch connection portions S1 and second branch connection portions S2, and the heat conduction layers 14 include adjacent first heat conduction layer T1 and second heat conduction layer T2. One end of the first branch connection portion S1 is connected to the positive electrode connection portion 131, the other end is insulated from the negative electrode connection portion 132, and both ends of the second branch connection portion S2 are insulated from the positive electrode connection portion 131 and the negative electrode connection portion 132. The first heat conductive layer T1 connects the first branch connection portion S1 and the second branch connection portion S2, and the first heat conductive layer T1 is insulated from both the positive electrode connection portion 131 and the negative electrode connection portion 132. The second heat conduction layer T2 is connected to the side of the second branch connection portion S2 away from the first branch connection portion S1, and one end of the second heat conduction layer T2 is insulated from the positive electrode connection portion 131 and the other end is connected to the negative electrode connection portion 132.

Specifically, as shown in fig. 3, A, B, C illustrates three current paths, each showing the general course of current flow through the first branch connection S1, the second branch connection S2, the first heat conductive layer T1, and the second heat conductive layer T2. The positive electrode connection portion 131, the first branch connection portion S1, the first heat conductive layer T1, the second branch connection portion S2, the second heat conductive layer T2, and the negative electrode connection portion 132 are in a series relationship. A. B, C the three current paths are more tortuous and can pass through more areas, and the heating area is larger. The currents among the A, B, C three current paths are in parallel connection, and the parallel circuits can enable the heating layer and the heat conduction layer to have larger areas to realize heating and temperature equalizing effects. The scheme for realizing insulation can adopt the modes of having a spacing distance between the two, arranging an insulating structure at the joint of the two and the like.

In one embodiment, referring to fig. 1 to 3, the branch connection portions 133 include a third branch connection portion S3 and a fourth branch connection portion S4, and the heat conductive layers 14 include a third heat conductive layer T3. One end of the third branch connection portion S3 is connected to the positive electrode connection portion 131, the other end is insulated from the negative electrode connection portion 132, one end of the fourth branch connection portion S4 is insulated from the positive electrode connection portion 131, the other end is connected to the negative electrode connection portion 132, the third heat conduction layer T3 is connected to the third branch connection portion S3 and the fourth branch connection portion S4, and both ends of the third heat conduction layer T3 are insulated from the positive electrode connection portion 131 and the negative electrode connection portion 132, respectively.

Specifically, as shown in fig. 3, D shows a current path showing the general course of current at the third branch connection S3, the third heat conductive layer T3 and the fourth branch connection S4. The positive electrode connection portion 131, the third branch connection portion S3, the third heat conductive layer T3, the fourth branch connection portion S4, and the negative electrode connection portion 132 are in a series relationship. So set up, can be comparatively nimble arrange heating and samming region.

Alternatively, as shown in fig. 1 and 3, the plurality of branch connecting parts 133 further include a fifth branch connecting part S5 and a sixth branch connecting part S6 located at the outermost side, one end of the fifth branch connecting part S5 is connected to the positive electrode connecting part 131, the other end is insulated from the negative electrode connecting part 132, and one end of the sixth branch connecting part S6 is connected to the negative electrode connecting part 132, and the other end is insulated from the positive electrode connecting part 131. The plurality of heat conductive layers 14 further include a fourth heat conductive layer T4, the fourth heat conductive layer T4 is connected to the fifth branch connection portion S5, and one end of the fourth heat conductive layer T4 is insulated from the positive electrode connection portion 131 and the other end is connected to the negative electrode connection portion 132. The positive electrode connection part 131 and the fifth branch connection part S5 may be formed in an "L" shape, and the negative electrode connection part 132 and the sixth branch connection part S6 may be formed in an "L" shape.

As shown in fig. 3, E shows a current path showing the general course of current at the fifth branch connections S5 and the fourth heat conducting layer T4. The positive electrode connector 131, the fifth branch connector S5, the fourth heat conductive layer T4 and the negative electrode connector 132 are connected in series. So set up, can be comparatively nimble arrange heating and samming region.

A. B, C, D, E the five current paths are connected in parallel, and the sixth branch connection S6 can lead A, B, C, D, E the five current paths to a common connection port. Optionally, as shown in fig. 2 to 4, the positive electrode connecting portion 131 is provided with a positive electrode port 134, the sixth branch connecting portion S6 is provided with a negative electrode port 135, the positive electrode port 134 and the negative electrode port 135 are electrically connected to a power supply, where the power supply may be a battery pack, that is, the battery cell 20 serves as the power supply, and the heating voltage is an output voltage of the battery pack. Alternatively, the positive port 134 and the negative port 135 may be close to each other for electrical connection. Alternatively, the negative electrode port 135 may be provided on the negative electrode connection portion 132 without providing the sixth branch connection portion S6.

In other embodiments, the specific structure of the heating layer 13 may be any other feasible structure, and the positive port 131 and the negative port 132 may also be disposed at any feasible positions, which is not limited to this.

In one embodiment, referring to fig. 7, the embodiment is substantially the same as the embodiment shown in fig. 1, except that the heating layer 13 is not provided, and only the heat conductive layer 14 is provided. Specifically, the heat generating structure is a heat conducting layer 14 with a preset thermal conductivity not lower than 1000 w/m.k. With this heating structure, only one heat conduction layer 14 is needed to achieve the heating and temperature uniformity functions.

In one embodiment, referring to fig. 1, the tray assembly 10 further includes a protective layer 17, and the protective layer 17 is disposed on a side of the insulating layer 16 opposite to the bottom plate 11. The protective layer 17 may be a metal plate or a non-metal plate, the metal plate may be a steel plate and may have a thickness of 0.5mm to 2mm, and the non-metal plate may be a carbon fiber plate or other high-strength material and may have a thickness of 2mm to 3 mm. The protective layer 17 is mainly used for resisting collision, stone impact, impact and the like so as to protect the bottom plate 11, the heating structure, the battery cell 20 and other structures.

In another embodiment, please refer to fig. 6, which is substantially the same as the embodiment shown in fig. 1, except that the protective layer 17 is not provided, and the insulating layer 16 performs both functions of heat preservation and protection. Specifically, the insulating layer 16 may be a non-metallic material.

In one embodiment, referring to fig. 4, a closed gap is formed between the protective layer 17 and the bottom plate 11, and the insulating layer 16 is air in the gap. In this embodiment, the gap may be formed by digging a groove on the protective layer 17 and/or the bottom plate 11, and the gap is filled with air without any other material, and the insulating layer 16 is the air in the gap. The specific matching form of the protective layer 17 and the bottom plate 11 is not limited, and only a closed gap is formed between the protective layer 17 and the bottom plate 11, and the gap has air which is used as a medium with low thermal conductivity and can play a role in heat preservation. The thickness of the gap (i.e., the distance separating the facing surfaces of the protective layer 17 and the base plate 11) may be set to 2mm to 5 mm.

In another embodiment, please refer to fig. 4, which is substantially the same as the previous embodiment except that the insulating layer 16 is filled in the gap. In this embodiment, the insulating layer 16 may be aerogel or other material with low thermal conductivity, and may also have an insulating effect.

In another embodiment, referring to fig. 1, the insulating layer 16 may also be a plate made of a low thermal conductivity material, and completely overlaps the bottom plate 11 and the protective layer 17, without a gap for filling.

In an embodiment, referring to fig. 4 and fig. 5, the insulating layer 16 has a plurality of insulating regions, and the insulating properties of the plurality of insulating regions are not all the same, so that the temperatures of different positions of the battery cells 20 are the same.

Because the temperature of each part of the battery cell 20 is different, the temperature at the middle part of the battery cell 20 is usually higher, and the temperature around the battery cell 20 is lower, so when the insulating layer 16 is designed, the different insulating regions of the insulating layer 16 can be set to have different insulating properties in consideration of the different initial temperatures of the battery cell 20, so that the insulating degrees of the battery cell 20 are different, and finally the temperatures of each part of the battery cell 20 are uniform.

Specifically, referring to fig. 4, when air in the gap is used as the insulating layer 16, the thickness of the middle portion of the gap may be set to be smaller, and the thicknesses of the two sides of the gap are set to be larger, so that the insulating layer 16 forms a first insulating region 161 at the middle portion and second insulating regions 162 at the two sides, the first insulating region 161 corresponds to the middle portion of the battery cell 20, the second insulating regions 162 correspond to the periphery of the battery cell 20, the insulating effect of the first insulating region 161 is weaker than that of the second insulating regions 162, the temperature rise range around the battery cell 20 is larger than that of the middle portion of the battery cell 20, and the temperatures of the battery cell 20 are uniform.

Referring to fig. 5, when the insulating layer 16 has a structure with a uniform thickness, different regions may be made of different materials, specifically, the middle portion of the insulating layer 16 is a first insulating portion 163 with high thermal conductivity, specifically, rubber-plastic cotton, polyurethane foam, and the like; the second heat preservation portion 164 with low thermal conductivity is disposed on both sides, and specifically, may be aerogel or the like. The heat preservation effect of the first heat preservation portion 163 is weaker than that of the second heat preservation portion 164, so that the temperature rise range around the battery cell 20 is larger than that of the middle portion of the battery cell 20, and the temperatures of all the battery cells 20 are uniform. The present embodiment is also applicable to the embodiment in which the insulating layer 16 is a material filled in the gap.

Referring to fig. 1, an embodiment of the present invention further provides a battery pack, which includes a battery cell 20 and a tray assembly 10 in the foregoing embodiment, the tray assembly 10 includes a boundary beam 25 and a bottom plate 11 enclosing to form an accommodating space, and the battery cell 20 is accommodated in the accommodating space. The battery package of this embodiment, because adopted the utility model discloses tray assembly 10, tray assembly 10 is through setting up range upon range of heat preservation 16 that sets up, bottom plate 11, heat-generating structure and insulating layer 15, integrated heating structure and the heat retaining heat preservation 16 that is used for heating electric core 20 on bottom plate 11, do not need additionally to set up PI heating film and fixed knot structure again, the holistic thermal management cost of battery package has been reduced, the space occupancy has been reduced, simultaneously because integrated tray assembly 10 has contained heating structure, do not need the assembly many times, the assembly complexity of battery package has still been reduced.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a tray assembly for holding electricity core, its characterized in that, including heat preservation, bottom plate, heating structure and the insulating layer of range upon range of setting, heating structure locates the bottom plate orientation electricity core one side, the heat preservation is used for keeping warm.

2. The tray assembly of claim 1, further comprising an adhesive layer, wherein the adhesive layer is coupled to the base plate, and wherein the heat generating structure is formed on the adhesive layer.

3. The tray assembly of claim 2, wherein the heat generating structure comprises a heating layer and a heat conducting layer in a same layer and connected to each other, wherein the heating layer comprises an hollowed space, and the heat conducting layer is accommodated in the hollowed space.

4. The tray assembly of claim 3, wherein the material of the heat conducting layer is any one of graphene, graphene composite material and carbon nanotubes, and the thermal conductivity of the heating layer is smaller than that of the heat conducting layer.

5. The tray assembly of claim 1, wherein the insulating layer is a thermally conductive insulating layer fabricated using a printing or spraying process.

6. The tray assembly of claim 1, wherein the heat generating structure is a thermally conductive layer of no less than a predetermined thermal conductivity, wherein the predetermined thermal conductivity is 1000w/m.k or greater.

7. The tray assembly of any one of claims 1 to 6, further comprising a protective layer disposed on a side of the insulating layer facing away from the bottom panel.

8. The tray assembly of claim 7, wherein the protective layer and the bottom plate form a closed gap therebetween, and the insulating layer is air in the gap or filled in the gap.

9. The tray assembly of claim 8, wherein the insulating layer has a plurality of insulating regions, and the insulating properties of the plurality of insulating regions are not all the same so that the temperatures of different locations of the cells are the same.

10. A battery pack, comprising a battery cell and the tray assembly of any one of claims 1 to 9, wherein the tray assembly comprises an edge beam and the bottom plate enclosing to form a containing space, and the battery cell is contained in the containing space.