CN220272604U

CN220272604U - Battery device

Info

Publication number: CN220272604U
Application number: CN202321195595.1U
Authority: CN
Inventors: 肖志伟; 王琼
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-05-17
Filing date: 2023-05-17
Publication date: 2023-12-29
Anticipated expiration: 2033-05-17

Abstract

The utility model relates to the technical field of batteries, in particular to a battery device, which comprises a box body and at least two battery columns arranged along a first direction, wherein each battery column comprises at least two batteries arranged along a second direction perpendicular to the first direction, a heating film is arranged between every two adjacent battery columns, and the heating film and the two adjacent battery columns are respectively bonded through adhesive layers; wherein, the heating film includes heating core, inner membranous layer and adventitia layer, and the inner membranous layer cladding is in the heating core, and the adventitia layer cladding is in the inner membranous layer, and the thickness of adventitia layer is 1.2mm ~ 2mm. Through the structural design, the inner membrane layer is protected by the outer membrane layer, so that the inner membrane layer is prevented from being exposed to the outside and being easily damaged under the action of extrusion force or shearing force. In addition, the outer film layer is in a reasonable thickness range, so that the structure reinforcing effect is ensured, the heating effect is further optimized by heating the film, and the energy density of the battery device is improved.

Description

Battery device

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery device.

Background

In the design scheme of the existing battery device, two adjacent battery columns are bonded by adopting a heating film, the heating film comprises a heating core body and a film layer coated outside the heating core body, and the film layer is of a single-layer structure and is thinner, so that the film layer is easy to damage when subjected to extrusion force and shearing force, the heating core body is exposed, dry heating is initiated, and even thermal runaway of the battery device is caused.

Disclosure of Invention

It is therefore a primary object of the present utility model to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a battery device that combines both the structural strength and the energy density of the heating film.

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

according to an aspect of the present utility model, there is provided a battery device, comprising a case and at least two battery strings arranged in a first direction, the battery strings including at least two batteries arranged in a second direction perpendicular to the first direction, a heating film being provided between adjacent two of the battery strings, the heating film being bonded to the adjacent two of the battery strings via adhesive layers, respectively; the heating film comprises a heating core body, an inner film layer and an outer film layer, wherein the inner film layer is coated on the heating core body, the outer film layer is coated on the inner film layer, and the thickness of the outer film layer is 1.2-2 mm.

As can be seen from the above technical solutions, the battery device provided by the present utility model has the following advantages and positive effects:

the battery device provided by the utility model is characterized in that a heating film is arranged between two adjacent battery columns in a clamping manner, the heating film is directly connected with the battery columns, the heating film comprises a heating core body, an inner film layer and an outer film layer, the inner film layer coats the heating core body, the outer film layer coats the inner film layer, and the thickness of the outer film layer is 1.2-2 mm. Through the structural design, the utility model can bond two adjacent battery strings by using the heating film, thereby being beneficial to reducing the number of parts of the battery device, reducing the weight and improving the space utilization rate. On the basis, the utility model utilizes the outer membrane layer to protect the inner membrane layer, and avoids the inner membrane layer being exposed to the outside and being easy to damage under the action of extrusion force or shearing force. In addition, the outer film layer is in a reasonable thickness range, so that the structure reinforcing effect is ensured, the heating effect is further optimized by heating the film, and the energy density of the battery device is improved.

Drawings

Various objects, features and advantages of the present utility model will become more apparent from the following detailed description of the preferred embodiments of the utility model, when taken in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the utility model and are not necessarily drawn to scale. In the drawings, like reference numerals refer to the same or similar parts throughout. Wherein:

fig. 1 is a schematic perspective view of a battery device according to an exemplary embodiment;

FIG. 2 is an exploded perspective view of the heating film shown in FIG. 1;

FIG. 3 is a schematic view in partial cross-section of the heating film shown in FIG. 1;

fig. 4 is a schematic plan view of a heating core of the heating film shown in fig. 1.

The reference numerals are explained as follows:

100. a case;

200. a battery string;

210. a battery;

220. a gap;

300. heating the film;

310. heating the core;

311. a body;

3111. a bridge crossing area;

312. a heating wire;

320. an inner membrane layer;

321. an inner adhesive layer;

330. an outer film layer;

331. an outer adhesive layer;

D. thickness;

x, a first direction;

y. second direction.

Detailed Description

Exemplary embodiments that embody features and advantages of the present utility model are described in detail in the following description. It will be understood that the utility model is capable of various modifications in various embodiments, all without departing from the scope of the utility model, and that the description and drawings are intended to be illustrative in nature and not to be limiting.

In the following description of various exemplary embodiments of the utility model, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary structures, systems, and steps in which aspects of the utility model may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present utility model. Moreover, although the terms "over," "between," "within," and the like may be used in this description to describe various exemplary features and elements of the utility model, these terms are used herein for convenience only, e.g., in terms of the orientation of the examples depicted in the drawings. Nothing in this specification should be construed as requiring a particular three-dimensional orientation of the structure in order to fall within the scope of the utility model.

Referring to fig. 1, a schematic perspective view of a battery device according to the present utility model is representatively illustrated. In this exemplary embodiment, a battery device according to the present utility model will be described by taking an in-vehicle battery as an example. Those skilled in the art will readily appreciate that many modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to adapt the relevant designs of the present utility model to other types of battery devices, and such changes are still within the principles of the battery devices presented herein.

As shown in fig. 1, in an embodiment of the present utility model, a battery device according to the present utility model includes a case 100 and a battery string 200. Referring to fig. 2-4 in conjunction, an exploded perspective view of a heating film 300 is representatively illustrated in fig. 2; a schematic partial cross-sectional view of a heating film 300 is representatively illustrated in fig. 3; a schematic plan view of the heating core 310 of the heating film 300 is representatively illustrated in fig. 4, in which a partial region of the heating core 310 is specifically enlarged, while a partial region of the battery string 200 corresponding to the enlarged region is illustrated. The structure, connection manner and functional relationship of the main components of the battery device according to the present utility model will be described in detail below with reference to the above-mentioned drawings.

As shown in fig. 1 to 3, in an embodiment of the present utility model, the battery device includes at least two battery rows 200 arranged along a first direction X, and the battery rows 200 include at least two batteries 210 arranged along a second direction Y, which is perpendicular to the first direction X. A heating film 300 is provided between two adjacent cell lines 200, and the heating film 300 and the two adjacent cell lines 200 are bonded together through adhesive layers, respectively. On this basis, the heating film 300 includes a heating core 310, an inner film layer 320 and an outer film layer 330, wherein the inner film layer 320 is coated on the heating core 310, the outer film layer 330 is coated on the inner film layer 320, and the thickness D of the outer film layer 330 is 1.2 mm-2 mm, for example, 1.2mm, 1.3mm, 1.5mm, 1.8mm, 2mm, etc. Through the structural design, the utility model can bond two adjacent battery strings 200 by using the heating film 300, thereby being beneficial to reducing the number of parts of the battery device, reducing the weight and improving the space utilization rate. On this basis, the present utility model protects the inner film 320 by the outer film 330, and prevents the inner film 320 from being easily damaged by the extrusion force or shearing force due to the exposure to the outside. Furthermore, the outer film layer 330 is formed to have a reasonable thickness D, so that the structure reinforcing effect is ensured, and the heating effect is further optimized by heating the film 300, thereby being beneficial to improving the energy density of the battery device.

Specifically, the present utility model bonds two adjacent battery strings 200 into a whole through the heating film 300 and then puts the whole into the case, thereby reducing the space occupied and the weight generated in the case 100 due to the additional arrangement of other stoppers, and improving the overall pack energy density of the battery device. On this basis, the heating film 300 can bear a transverse shearing force generated by expansion and dislocation of the battery 210 and a longitudinal shearing force generated by gravity pulling of the battery 210 in the case-in process, and furthermore, when the battery 210 generates vibration displacement in all directions (for example, a first direction X, a second direction Y and a height direction in the drawing) in use, the heating film 300 can bear a certain extrusion force and shearing force. Therefore, the heating film 300 is not damaged by the force, and the adhesive connection between the battery 210 and the heating film 300 is ensured. The utility model adopts the heating film 300 comprising the outer film layer 330 and the inner film layer 320, uses the outer film layer 330 to bond the battery 210, protects the inner film layer 320, and uses the inner film layer 320 to protect the heating core 310, even if the outer film layer 330 is damaged, the inner film layer 320 can still protect the heating core 310 inside, thereby avoiding the dry burning phenomenon of the heating core 310 and even causing thermal runaway of the battery 210. In addition, the utility model can fill the assembly gap 220 between the two rows of batteries 210 by using the thickness of the heating film 300, so that the heating film 300 can play roles of bonding the batteries 210 and limiting the batteries into groups. The thickness D of the outer film 330 is controlled within a reasonable range, so that the heat conduction path between the heating core 310 and the battery 210 is prevented from being prolonged due to the excessively thick outer film 330, a better heating effect is ensured, the energy density of the battery device is prevented from being improved due to the excessively thick outer film 330 and the excessively large space occupied by the outer film 330 is prevented, and meanwhile, the thickness D of the outer film 330 is prevented from being excessively small and insufficient to generate enough structural strength improvement.

In one embodiment of the present utility model, the shear strength of the outer film layer 330 may be 50MPa. Through the design, the utility model can ensure that the outer film layer 330 can bear the transverse shearing force generated by the expansion dislocation of the battery 210 and the longitudinal shearing force generated by the gravity pulling of the battery 210 in the box-in process, and can ensure that the heating film 300 can bear the extrusion force and the shearing force generated by the battery 210 to the heating film 300 when the battery 210 generates vibration displacement in all directions.

In an embodiment of the present utility model, the adhesive strength between the heating film 300 and the battery 210 may be 1.3MPa or more, for example, 1.3MPa, 1.35MPa, 1.4MPa, 1.5MPa, etc. Through the design, since the two adjacent battery rows 200 are adhered and fastened into a whole through the heating film 300, the adhesive strength between the heating film 300 and the batteries 210 is in a reasonable range, and the adhesive strength requirement when the adjacent batteries 210 are assembled into a whole can be met.

In one embodiment of the present utility model, the thermal conductivity of the outer film layer 330 may be greater than or equal to 0.8W/(mK), such as 0.8W/(mK), 0.85W/(mK), 0.9W/(mK), 0.95W/(mK), etc. Through the design, the utility model can ensure that the heating film 300 conducts heat with the battery 210 through the outer film layer 330, and ensure the heating effect of the heating film 300 on the battery 210. In some embodiments, the thermal conductivity of the outer film 330 may also be less than 0.8W/(m·k), such as 0.79W/(m·k)), and the like, which is not limited to this embodiment.

In one embodiment of the present utility model, the power density of the heating film 300 may be less than or equal to 0.45W/cm ² For example 0.2W/cm ² 、0.25W/cm ² 、0.3W/cm ² 、0.35W/cm ² 、0.45W/cm ² Etc. Through the above design, the present utility model can ensure the heating efficiency of the heating film 300 to the battery 210.

As shown in fig. 4, in an embodiment of the present utility model, a gap 220 is provided between two adjacent cells 210 belonging to the same cell string 200. The heating core 310 includes a main body 311 and a heating wire 312 disposed on the main body 311, the main body 311 has a bridge region 3111 corresponding to the gap 220, the heating wire 312 of the bridge region 3111 is located in a partial area of the bridge region 3111, and a distance between the heating wire 312 of the bridge region 3111 and a bottom plate side of the main body 311 facing away from the case 100 is greater than a distance between the heating wire 312 of the bridge region 3111 and the main body 311 facing the bottom plate side, i.e. the heating wire 312 of the bridge region 3111 is located in an area relatively close to the lower side of the main body 311. The battery string 200 expands into a fan shape in the later period of life, that is, the upper end of each battery 210 of the battery string 200 has a longer length than the lower end, so that the battery string 200 formed by arranging a plurality of batteries 210 is approximately fan-shaped, and the expansion deformation phenomenon is caused by the restraint of glue filling and a limiting beam at the bottom of the battery 210, and the restraint force on the top of the battery 210 is smaller. On the basis, the heating wire 312 of the bridge zone 3111 is arranged in the area of the body 311 close to the lower part, so that resistance change caused by pulling of the heating wire 312 can be avoided, and the heating film 300 can still provide a required heating function in the later period of life of the battery device.

It should be noted that, as shown in fig. 4, the edge of the battery 210 has an R angle, and accordingly, the above-mentioned gap 220 may be understood as an area between an end of the R angle of one battery 210 on a first surface and an end of the R angle of another adjacent battery 210 on the first surface, where the first surface refers to a surface where the battery 210 is adhesively connected to the heating film 300.

As shown in fig. 2, in an embodiment of the present utility model, the inner film layer 320 may be a continuous film layer structure, and the outer film layer 330 may be a continuous film layer structure. Through the above structural design, the utility model can ensure that the outer film layer 330 and the inner film layer 320 of the heating film 300 are both continuous structures without the results of windowing, notching, and the like, thereby being beneficial to ensuring the shearing strength of the heating film 300.

In an embodiment of the present utility model, the material of the inner film 320 may be polyimide, that is, the inner film 320 may be a polyimide film. In some embodiments, the material of the inner film 320 may be other materials, but is not limited to this embodiment.

In an embodiment of the present utility model, the material of the outer film layer 330 may be silica gel, that is, the outer film layer 330 may be a silica gel film layer. In some embodiments, the material of the outer film 330 may be other materials, but is not limited to this embodiment.

As shown in fig. 3, in an embodiment of the present utility model, the outer film layer 330 and the inner film layer 320 may be adhesively connected via the outer adhesive layer 331. Through the above structural design, the present utility model can facilitate the connection of the outer film layer 330 and the inner film layer 320 by using the outer adhesive layer 331.

Based on the structural design that the outer film layer 330 and the inner film layer 320 are adhesively connected via the outer adhesive layer 331, in an embodiment of the utility model, the material of the outer adhesive layer 331 may be thermosetting. In some embodiments, the material of the outer adhesive layer 331 may be other materials, such as but not limited to epoxy glue.

As shown in fig. 3, in an embodiment of the present utility model, the inner film 320 and the heating core 310 may be adhesively connected via the inner adhesive layer 321. Through the above structural design, the present utility model can facilitate the connection of the inner film 320 and the heating core 310 by using the inner adhesive layer 321.

Based on the structural design that the inner film 320 and the heating core 310 are bonded via the inner adhesive 321, in an embodiment of the present utility model, the material of the inner adhesive 321 may be a thermosetting adhesive. In some embodiments, the material of the inner adhesive layer 321 may be other materials, such as but not limited to epoxy glue.

In one embodiment of the present utility model, the heating core 310 may be made of brass. In some embodiments, the heating core 310 may be made of other materials, such as, but not limited to, one of red copper and stainless steel.

Based on the above detailed description of several exemplary embodiments of the battery device proposed by the present utility model, the heating film 300 of the battery device will be further described in the form of specific examples.

In the first embodiment, the inner film 320 of the heating film 300 is a polyimide film and the outer film 330 is a silica gel film. On this basis, polyimide film layers are respectively arranged on two sides of the heating core 310 through inner bonding layers 321, silica gel layers are respectively arranged on the opposite outer sides of the two polyimide film layers through outer bonding layers 331, and glass fiber mesh cloth can be clamped in the silica gel layers. In the above-mentioned multi-layer composite design of the heating film 300, the outer film layer 330 may be specifically made of cured silica gel, and the cured silica gel is directly adhered to the polyimide film layer through the outer adhesive layer 331.

In the second embodiment, the inner film 320 of the heating film 300 is a polyimide film, and the outer film 330 is a silica gel film. On this basis, polyimide film layers are respectively arranged on two sides of the heating core 310 through inner bonding layers 321, silica gel layers are respectively arranged on the opposite outer sides of the two polyimide film layers, and glass fiber mesh cloth can be clamped in the silica gel layers. In the above-mentioned multi-layer composite design of the heating film 300, the outer film layer 330 is formed of silica gel, and is vulcanized into cured silica gel during the process, and the silica gel layer and the polyimide film layer are bonded and connected through the vulcanization process. Accordingly, since the vulcanizing process is mature, the embodiment can further enhance the manufacturing efficiency of the heating film 300.

Based on the above detailed description of several specific embodiments of the heating film 300 of the battery device according to the present utility model, a process for manufacturing the heating film 300 of the battery device will be exemplified below.

Firstly, the manufacturing process of the conventional silica gel heating film comprises the steps of blanking (steel plate), etching a circuit, attaching a core body on raw materials, unlocking a PET (polyethylene terephthalate) bottom film, covering a silica gel film, vulcanizing, and further, the manufacturing process of the conventional polyimide heating film comprises the steps of blanking (copper foil), placing the core body on the bottom film, etching the circuit, covering the upper film, cutting and hot-pressing. On the other hand, the heating film 300 of the present utility model may be manufactured by using two existing processes, specifically including "blanking (copper foil) → placing the core on the base film→ etching the circuit→ covering the film→ cutting→ hot pressing→ covering the silicone film→ vulcanizing", wherein the vulcanizing process is specific to the embodiment of using raw silicone for the silicone film, and the vulcanizing process is omitted when using cooked silicone for the silicone film.

It should be noted herein that the battery devices shown in the drawings and described in this specification are only a few examples of the wide variety of battery devices that can employ the principles of the present utility model. It should be clearly understood that the principles of the present utility model are in no way limited to any of the details of the battery device or any of the components of the battery device shown in the drawings or described in the present specification.

In summary, the battery device provided by the utility model adopts the heating film 300 to be sandwiched between two adjacent battery rows 200, and the heating film 300 is directly connected with the battery rows 200, wherein the heating film 300 comprises a heating core 310, an inner film layer 320 and an outer film layer 330, the inner film layer 320 coats the heating core 310, the outer film layer 330 coats the inner film layer 320, and the thickness D of the outer film layer 330 is 1.2 mm-2 mm. Through the structural design, the utility model can bond two adjacent battery strings 200 by using the heating film 300, thereby being beneficial to reducing the number of parts of the battery device, reducing the weight and improving the space utilization rate. On this basis, the present utility model protects the inner film 320 by the outer film 330, and prevents the inner film 320 from being easily damaged by the extrusion force or shearing force due to the exposure to the outside. Furthermore, the outer film layer 330 is formed to have a reasonable thickness D, so that the structure reinforcing effect is ensured, and the heating effect is further optimized by heating the film 300, thereby being beneficial to improving the energy density of the battery device.

Exemplary embodiments of the battery device proposed by the present utility model are described and/or illustrated in detail above. Embodiments of the utility model are not limited to the specific embodiments described herein, but rather, components and/or steps of each embodiment may be utilized independently and separately from other components and/or steps described herein. Each component and/or each step of one embodiment may also be used in combination with other components and/or steps of other embodiments. When introducing elements/components/etc. that are described and/or illustrated herein, the terms "a," "an," and "the" are intended to mean that there are one or more of the elements/components/etc. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc., in addition to the listed elements/components/etc. Furthermore, the terms "first" and "second" and the like in the claims and in the description are used for descriptive purposes only and not for numerical limitation of their subject matter.

While the utility model has been described in terms of various specific embodiments, those skilled in the art will recognize that the utility model can be practiced with modification within the spirit and scope of the claims.

Claims

1. The battery device is characterized by comprising a box body and at least two battery columns arranged along a first direction, wherein each battery column comprises at least two batteries arranged along a second direction perpendicular to the first direction, a heating film is arranged between every two adjacent battery columns, and the heating film and the two adjacent battery columns are respectively bonded through adhesive layers; the heating film comprises a heating core body, an inner film layer and an outer film layer, wherein the inner film layer is coated on the heating core body, the outer film layer is coated on the inner film layer, and the thickness of the outer film layer is 1.2-2 mm.

2. The battery device of claim 1, wherein the outer film layer has a shear strength of 50Mpa.

3. The battery device according to claim 1, wherein the adhesive strength between the heating film and the battery is 1.3MPa or more.

4. The battery device according to claim 1, wherein the thermal conductivity of the outer film layer is 0.8W/(m-k) or more.

5. The battery device according to claim 1, wherein the power density of the heating film is less than or equal to 0.45W/cm ² 。

6. The battery device according to any one of claims 1 to 5, wherein a gap is provided between two adjacent batteries belonging to one battery row, the heating core comprises a body and a heating wire arranged on the body, the body is provided with a bridge region corresponding to the gap, the heating wire of the bridge region is positioned in a partial region of the bridge region, and the distance between the heating wire of the bridge region and the side of the body facing away from the bottom plate of the case is larger than the distance between the heating wire of the bridge region and the side of the body facing toward the bottom plate.

7. The battery device of any one of claims 1-5, wherein the inner film layer is a continuous film layer structure and the outer film layer is a continuous film layer structure.

8. The battery device according to any one of claims 1 to 5, wherein:

the inner film layer is made of polyimide; and/or

The outer membrane layer is made of silica gel.

9. The battery device according to any one of claims 1 to 5, wherein the outer film layer and the inner film layer are adhesively connected via an outer adhesive layer.

10. The battery device of claim 9, wherein the outer adhesive layer is one of a thermosetting adhesive and an epoxy adhesive.