CN219457928U

CN219457928U - Battery pack and vehicle comprising same

Info

Publication number: CN219457928U
Application number: CN202320296696.1U
Authority: CN
Inventors: 李社飞
Original assignee: Weilai Battery Technology Anhui Co ltd
Current assignee: Weilai Battery Technology Anhui Co ltd
Priority date: 2023-02-20
Filing date: 2023-02-20
Publication date: 2023-08-01
Anticipated expiration: 2033-02-20

Abstract

The utility model relates to the technical field of battery packs, and particularly provides a battery pack and a vehicle comprising the battery pack. In order to solve the problem that the hot air spreads in the battery pack to cause danger when the conventional battery pack is in thermal runaway, the battery pack comprises a bottom plate, a supporting plate and a battery cell, wherein the supporting plate is arranged on the bottom plate, the battery cell is arranged on the supporting plate, the supporting plate is positioned between the bottom plate and the battery cell, the supporting plate has a certain height so that a certain height difference exists between the battery cell and the bottom plate, an exhaust hole is formed in the bottom plate, and an explosion-proof valve is arranged at the exhaust hole. The battery cell is supported through the section bar backup pad for have certain difference in height between battery cell and the bottom plate, when battery cell thermal runaway, high temperature high pressure's gas is discharged from the bottom exhaust hole fast after bursting the explosion-proof valve, compare in current battery package lateral part exhaust, shortened exhaust distance greatly, accelerated the pressure release speed, avoid the steam to spread other regions in the battery package and can not in time discharge and cause danger.

Description

Battery pack and vehicle comprising same

Technical Field

The utility model relates to the technical field of batteries, and particularly provides a battery pack and a vehicle comprising the battery pack.

Background

At present, battery packs are more and more prone to adopting battery cells with high energy density, so that when thermal runaway occurs, hot air needs to be discharged out of the pack quickly in time, otherwise, when the hot air circulates in the pack, heat spreading occurs, and catastrophic events are generated, so that how to discharge the hot air out of the pack in time when thermal runaway occurs, meanwhile, the hot air does not circulate in the pack, and the heat spreading is avoided. The conventional battery Bao Re is mainly provided with an explosion-proof valve at the side part of the box body in a runaway solution, the explosion-proof valve is large in size and high in height, and therefore, the explosion-proof valve can only be installed at the side part of the box body, and hot air can be discharged, but for a high-energy-density battery cell, hot air is simply discharged without stopping circulation of the hot air in the battery pack, and is generally discharged from the side part, so that the hot air flows in the pack to easily cause heat spreading, and an air passage path is complex.

Accordingly, there is a need in the art for a new battery pack to address the problem of the existing battery packs that are dangerously caused by the spreading of hot gases within the pack during thermal runaway.

Disclosure of Invention

The utility model aims to solve the technical problems, namely, the problems that the hot air spreads in the battery pack to cause danger when the battery pack is out of control.

In a first aspect, the utility model provides a battery pack, the battery comprises a bottom plate, a plurality of support plates and a battery cell, the support plates are arranged on the bottom plate, the battery cell is arranged on the support plates, the support plates are positioned between the bottom plate and the battery cell, the support plates have a certain height so that a certain height difference exists between the battery cell and the bottom plate, the bottom plate is provided with an exhaust hole, and an explosion-proof valve is arranged at the exhaust hole.

In the preferred technical scheme of the battery pack, a gap is formed between every two adjacent supporting plates, and the exhaust holes are formed in the bottom plate in the gap.

In the preferred technical scheme of the battery pack, the battery pack further comprises side section bars, the plurality of support plates are welded through the side section bars to form an integral frame structure, and the bottom plate is connected with the frame structure.

In the preferred technical scheme of the battery pack, the explosion-proof valve comprises a weakening structure and a hot melt adhesive film, the weakening structure is arranged at the exhaust hole, the hot melt adhesive film is arranged on the weakening structure, and the hot melt adhesive film is arranged between the exhaust hole and the weakening structure.

In a preferred embodiment of the above battery pack, the strength of the weakening structure is lower than that of the bottom plate.

In a preferred embodiment of the above battery pack, the thickness of the weakening structure is smaller than the thickness of the bottom plate; or the weakening structure is made of a material with lower strength than the bottom plate; or a plurality of nicks or grooves are arranged on the weakening structure.

In the preferred technical scheme of the battery pack, the hot melt adhesive film is one of a PET film or an E-PTFE film.

In the preferred technical scheme of the battery pack, the supporting plate is of a hollow structure.

In a preferred embodiment of the above battery pack, the support plate has a height of 9mm to 15mm.

In a second aspect, the utility model also provides a vehicle comprising a battery pack according to any one of the above technical solutions.

It can be understood by those skilled in the art that the battery pack of the utility model comprises a bottom plate, a supporting plate and a battery core, wherein the supporting plate is arranged on the bottom plate, the battery core is arranged on the supporting plate, the supporting plate is positioned between the bottom plate and the battery core, the supporting plate has a certain height so as to have a certain height difference between the battery core and the bottom plate, the bottom plate is provided with an exhaust hole, and the exhaust hole is provided with an explosion-proof valve.

Under the condition of adopting the technical scheme, the battery pack supports the battery core through the section bar supporting plate, so that a certain height difference exists between the battery core and the bottom plate, when the battery core is out of control, high-temperature and high-pressure gas breaks through the explosion-proof valve and is rapidly discharged from the bottom exhaust hole.

Drawings

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings, in which:

fig. 1 is an exploded construction view of a battery pack according to the present utility model;

fig. 2 is a connection structure diagram of the support plate of the present utility model;

FIG. 3 is an exploded view of FIG. 2;

fig. 4 is a cross-sectional view of a battery pack;

FIG. 5 is a cross-sectional view at A-A in FIG. 2;

fig. 6 is an enlarged view at B in fig. 5.

List of reference numerals:

1. a bottom plate; 11. an exhaust hole; 2. a support plate; 3. a battery cell; 4. an upper cover; 5. an explosion-proof valve; 51. weakening the structure; 52. and (5) a hot melt adhesive film.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model. Those skilled in the art can adapt it as desired to suit a particular application. For example, the battery pack of the present utility model may be applied to vehicles such as electric vehicles, hybrid electric vehicles, and fuel vehicles, and may be applied to devices other than vehicles.

It should be noted that, in the description of the present utility model, terms such as "inner", "outer", and the like refer to directions or positional relationships based on directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the term "connected" should be interpreted broadly, and for example, may be a fixed connection, a removable connection, or a unitary connection; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Referring to fig. 1 to 3, in order to solve the problem that the hot air spreads in the pack to cause danger when the existing battery pack is in thermal runaway, the battery pack of the utility model comprises a bottom plate 1, a support plate 2 and a battery cell 3, wherein the support plate 2 is arranged on the bottom plate 1, the battery cell 3 is arranged on the support plate 2, referring to fig. 4, the support plate 2 is positioned between the bottom plate 1 and the battery cell 3, the support plate 2 has a certain height so that a certain height difference H exists between the battery cell 3 and the bottom plate 1, an exhaust hole 11 is arranged on the bottom plate 1, and an explosion-proof valve 5 is arranged at the exhaust hole 11.

The above arrangement has the advantages that: according to the battery pack, the battery core 3 is supported by the section bar supporting plate 2, so that a certain height difference exists between the battery core 3 and the bottom plate 1, when the battery core 3 is in thermal runaway, high-temperature and high-pressure gas breaks through the explosion-proof valve 5 and is rapidly discharged from the bottom exhaust hole 11.

Referring to fig. 1 and 2, in one possible embodiment, the battery pack specifically includes a base plate 1, five support plates 2, a battery cell 3, and an upper cover 4, the plurality of support plates 2 being disposed on the base plate 1 at intervals, the upper cover 4 being disposed on the battery cell 3. Wherein the support plate 2 is located between the base plate 1 and the battery cell 3, referring to fig. 4, the support plate 2 supports the battery cell 3, and the support plate 2 has a certain height so that there is a certain height difference H between the battery cell 3 and the base plate 1, preferably, the height of the support plate 2 is 9mm to 15mm so that the height difference between the battery cell 3 and the base plate 1 is 9mm to 15mm.

With continued reference to fig. 2 and fig. 3, further, a certain gap is formed between every two adjacent support plates 2, and an exhaust hole 11 is formed in the bottom plate 1 in the gap, so that when the electric core 3 is out of control thermally, high-temperature and high-pressure gas is discharged from the exhaust hole 11 to the battery pack, and the spreading of hot gas in the battery pack in a large range is avoided. The shape of the exhaust hole 11 may be a round hole, a square hole or other shapes, the number of the exhaust holes may be one, two or four, etc., the utility model does not limit the number and the shape of the exhaust hole 11, and the utility model can be set by one skilled in the art according to the needs.

Referring to fig. 4, further, the support plate 2 has a hollow structure inside, thereby reducing the weight of the battery pack. In another embodiment, referring to fig. 3, a plurality of support plates 2 are welded with side profiles to form a unitary frame structure, and then welded or fastened to the bottom plate 1, thereby improving assembly efficiency. However, it should be noted that the connection manner between the base plate 1 and the support plate 2 is not limited to the above connection manner, and the two may be connected by a slot, a buckle, or the like, and may be set by a person skilled in the art as required. In addition, the number of the support plates 2 is not limited to five, but can also be two, three, four, six or seven, etc., and the number of the support plates 2 can be set by a person skilled in the art according to the needs, and the structure of the support plates 2 is not limited to the section bar with a hollow structure, can be a solid structure, and can be selected by a person skilled in the art according to the needs.

With continued reference to fig. 3, further, the battery pack further includes an explosion-proof valve 5, where the explosion-proof valve 5 specifically includes a weakening structure 51 and a hot-melt adhesive film 52, the hot-melt adhesive film 52 is a PET film, the PET film is attached to the weakening structure 51, the weakening structure 51 is disposed at the exhaust hole 11 of the bottom plate 1, the outer edge of the weakening structure 51 is fully welded with the bottom plate 1, the weakening structure 51 is located between the electric core 3 and the exhaust hole 11, and the PET film is located between the exhaust hole 11 and the weakening structure 51.

The strength of the weakening structure 51 is lower than that of the bottom plate 1, so that hot air can break through the weakening structure 51 to be discharged out of the battery pack when the battery cell 3 is out of control, and the effect of directional air discharge and pressure relief is achieved. The strength of the weakening structure 51 may be reduced in various manners, for example, the thickness of the weakening structure 51 is lower than that of the bottom plate 1, or the weakening structure 51 is made of a material with strength lower than that of the bottom plate 1, or a plurality of notches or grooves may be formed on the weakening structure 51 to reduce the strength of the weakening structure 51, so that the weakening structure 51 can be broken by air flow in case of thermal runaway, and a person skilled in the art may set the structure and the setting area of the weakening structure 51 as required, so long as the strength of the weakening structure 51 is lower than that of the bottom plate 1 and can be broken by hot air. In addition, the hot melt adhesive film 52 may be a polytetrafluoroethylene (E-PTFE) film or the like in addition to the PET film, and the present utility model is not limited in type to the hot melt adhesive film 52, as long as the hot melt adhesive film 52 can melt after being heated, and those skilled in the art can select as needed.

When a certain cell 3 is out of control, high-temperature and high-pressure gas can be instantaneously discharged, the PET film can be quickly melted by hot gas, meanwhile, the high-pressure gas impact-attenuation structure 51 deforms the PET film, and finally, the high-temperature and high-pressure gas is quickly discharged out of the battery pack from the exhaust hole 11 of the bottom plate 1, so that an extremely short exhaust path is provided, the hot gas is effectively prevented from spreading in the battery pack, and further, the explosion, the fire and other dangers are prevented.

In summary, according to the battery pack of the present utility model, the plurality of support plates 2 for supporting the battery cells 3 are disposed on the bottom plate 1 of the battery pack, so that a certain height difference exists between the battery cells 3 and the bottom plate 1, and a gap exists between two adjacent support plates 2, when the battery cells 3 are out of control, hot air flows only in a small range in the gap, and the exhaust is instantaneously released and exhausted through the explosion-proof valve 5 on the exhaust hole 11, so that the exhaust path is short, the exhaust speed is fast, the gas spreading range is small, and the safety of the battery pack can be greatly improved.

The foregoing embodiments are merely illustrative of the principles of the present utility model, and are not intended to limit the scope of the utility model, as those skilled in the art can modify the above structure without departing from the principles of the present utility model, so that the present utility model can be applied to more specific application scenarios.

In addition, the utility model also provides a vehicle provided with the battery pack in any one of the embodiments.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims

1. The utility model provides a battery package, its characterized in that includes bottom plate, a plurality of backup pad and electric core, the backup pad sets up on the bottom plate, the electric core sets up in the backup pad, the backup pad is located the bottom plate with between the electric core, the backup pad has certain height so that have certain difference in height between electric core and the bottom plate, be provided with the exhaust hole on the bottom plate, exhaust hole department is provided with explosion-proof valve.

2. The battery pack of claim 1, wherein there is a gap between each adjacent two of the support plates, and the vent holes are provided in the bottom plate within the gap.

3. The battery pack of claim 2, further comprising a side profile, wherein a plurality of the support plates are welded by the side profile to form an integral frame structure, and wherein the bottom plate is connected to the frame structure.

4. The battery pack of claim 1, wherein the explosion proof valve includes a weakening structure disposed at the vent and a hot melt adhesive film disposed on the weakening structure, the hot melt adhesive film being located between the vent and the weakening structure.

5. The battery pack of claim 4, wherein the strength of the weakened structure is lower than the strength of the base plate.

6. The battery pack of claim 5, wherein the thickness of the weakened structure is less than the thickness of the base plate; or the weakening structure is made of a material with lower strength than the bottom plate; or a plurality of nicks or grooves are arranged on the weakening structure.

7. The battery pack of claim 4, wherein the hot melt adhesive film is one of a PET film or an E-PTFE film.

8. The battery pack of claim 1, wherein the support plate is a hollow structure.

9. The battery pack of claim 1, wherein the support plate has a height of 9mm to 15mm.

10. A vehicle comprising the battery pack of any one of claims 1-9.