CN219811628U

CN219811628U - Battery pack exhaust structure and battery pack

Info

Publication number: CN219811628U
Application number: CN202320577046.4U
Authority: CN
Inventors: 黄毅轩; 唐丽娟; 杨雪
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-03-22
Filing date: 2023-03-22
Publication date: 2023-10-10
Anticipated expiration: 2033-03-22

Abstract

The utility model provides a battery pack exhaust structure and a battery pack, wherein the battery pack exhaust structure is arranged on a shell of the battery pack, and the shell is provided with an explosion-proof valve mounting beam with a cavity formed inside; the battery pack exhaust structure comprises an outer ventilation opening arranged on one side of the explosion-proof valve mounting beam facing the outside of the battery pack, an inner ventilation opening arranged on one side of the explosion-proof valve mounting beam facing the inside of the battery pack, and a gas exchange channel formed by a cavity, wherein the outer ventilation opening and the inner ventilation opening are communicated with the gas exchange channel; the explosion-proof valve of the battery pack is arranged at the outer ventilation opening, and the inner ventilation opening and the outer ventilation opening are arranged in a staggered manner and are far away from the electric parts in the battery pack. The exhaust structure of the battery pack can effectively improve the condensation phenomenon in the battery pack, improve the safety performance of the battery pack, and has a certain fire filtering function, so that a fire filtering device on an explosion-proof valve can be omitted, and the cost is saved.

Description

Battery pack exhaust structure and battery pack

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery pack exhaust structure. The utility model also relates to a battery pack provided with the battery pack exhaust structure.

Background

With the rapid development of new energy automobiles, the energy density of the battery pack is directly related to the improvement of the driving range of the whole automobile. In order to improve the energy density of the battery pack, the most fundamental is to improve the energy density of the battery cell, and when the high-energy sealed battery cell brings the improvement of driving mileage, serious consequences such as the ignition of the battery pack are brought, in order to reduce the risk of ignition and explosion when the battery pack is out of control, a plurality of explosion-proof valves are usually used on the battery pack.

But the explosion-proof valve has a ventilation function, and when the battery pack is in a high-temperature and high-humidity environment, a large amount of air containing water vapor may be introduced, and when the water vapor is condensed into water drops in the battery pack, the insulation risk in the battery pack is increased.

In the existing battery pack, the mounting hole of the explosion-proof valve penetrates through the mounting beam and is opposite to the inside of the battery pack, and outside air can enter the battery pack through the explosion-proof valve. Moisture in the air can condense on nearby parts that are at a lower temperature. Continued ingress of water vapor can lead to shorting problems with the electrical components inside the battery pack. And, because the explosion-proof valve arrangement position is limited by the whole vehicle, the explosion-proof valve meeting the arrangement position positively corresponds to the electric parts in the battery pack, so that the short circuit risk in the battery pack is increased, and the use safety performance of the battery pack is influenced.

Disclosure of Invention

In view of the above, the present utility model is directed to providing a battery pack with improved condensation environment and improved safety.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a battery pack venting structure disposed on a housing of a battery pack, the housing having an explosion-proof valve mounting beam with a cavity formed therein;

the battery pack exhaust structure comprises an outer ventilation opening arranged on one side of the explosion-proof valve mounting beam facing the outside of the battery pack, an inner ventilation opening arranged on one side of the explosion-proof valve mounting beam facing the inside of the battery pack, and a gas exchange channel formed by the cavity, wherein the outer ventilation opening and the inner ventilation opening are communicated with the gas exchange channel;

the explosion-proof valve of the battery pack is arranged at the outer ventilation opening, and the inner ventilation opening and the outer ventilation opening are arranged in a staggered manner and are far away from electrical components in the battery pack.

Further, the area of the inner ventilation opening is larger than the area of the ventilation membrane of the explosion-proof valve due to the projection of the inner ventilation opening on the mounting surface of the explosion-proof valve.

Further, the distance a between the central axis of the explosion-proof valve and the central axis of the inner ventilation opening satisfies the following relationship: 100mm < a < 700mm.

Further, a moisture absorbing member is arranged in the gas exchange channel at a position close to the inner ventilation opening.

Further, the moisture absorbing member is detachably connected to the explosion-proof valve mounting beam.

Further, the moisture absorbing piece comprises a moisture absorbing sheet which is connected to the explosion-proof valve mounting beam in an adhesive mode, and the area ratio i of the surface area of the moisture absorbing sheet to the area of the outer ventilation opening meets the following relation: 1 < i < 5.

Compared with the prior art, the utility model has the following advantages:

according to the battery pack exhaust structure, the explosion-proof valve of the battery pack is arranged on the outer ventilation opening through the gas exchange channel, the inner ventilation opening and the outer ventilation opening which are arranged on the explosion-proof valve mounting beam, the inner ventilation opening and the outer ventilation opening are arranged in a staggered mode, and the inner ventilation opening is far away from electrical parts in the battery pack, so that a cavity structure in the explosion-proof valve mounting beam can be utilized as the gas exchange channel, the ventilation part of the explosion-proof valve can be prevented from directly corresponding to the electrical parts in the battery pack, the condensation phenomenon in the battery pack can be effectively improved, the safety performance of the battery pack is improved, and the exhaust of gas in the battery pack is facilitated when the battery pack is in thermal runaway. Meanwhile, the inner ventilation opening has a certain fire filtering function, and a fire filtering device on the explosion-proof valve can be omitted, so that the cost is saved.

In addition, the area of the inner ventilation opening is larger than that of the ventilation film of the explosion-proof valve, so that the efficiency of external air entering the battery pack is improved, and meanwhile, when the battery pack is in thermal runaway, the diffusion and the discharge of the air in the battery pack are also improved. The distance a between the central axis of the explosion-proof valve and the central axis of the inner ventilation opening is larger than 100mm and smaller than 700mm, which is favorable for effectively preventing the electric element from condensation, protecting the electric element and also favorable for the arrangement of the inner ventilation opening.

In addition, the moisture absorbing piece is arranged in the heat exchange channel, so that moisture in the air in the battery pack can be absorbed, and the occurrence of internal condensation can be further avoided. The moisture absorbing piece is detachably connected to the explosion-proof valve mounting beam, and replacement of the moisture absorbing piece is facilitated. The moisture absorption piece adopts the moisture absorption piece, and the surface area of the moisture absorption piece is larger than the area of the outer ventilation opening, so that the moisture absorption effect can be improved, and the occurrence of internal condensation is further avoided.

Another object of the present utility model is to provide a battery pack, in which the housing of the battery pack is provided with the battery pack exhaust structure as described above.

Further, the casing includes two first side beams of relative arrangement, and connects two second side beam and the third side beam between the first side beam, second side beam with inject module holding chamber and electrical component holding chamber between third side beam and the two first side beam, the second side beam includes two inclined form of symmetrical arrangement explosion-proof valve installation roof beam, and connect two connecting beam between the explosion-proof valve installation roof beam.

Further, a reinforcing beam is arranged in the module accommodating cavity, and two ends of the reinforcing beam are connected to the side beams.

Further, a plurality of battery modules are arranged in the module accommodating cavity side by side, and the battery modules are arranged on the liquid cooling plate at the bottom of the shell.

The battery pack of the utility model has the same beneficial effects as the exhaust structure of the battery pack described above with respect to the prior art. Moreover, the description is omitted here.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic view illustrating a first view of a battery pack exhaust structure according to an embodiment of the utility model;

fig. 2 is a schematic structural diagram of a second view of a battery pack exhaust structure according to an embodiment of the utility model;

fig. 3 is a schematic structural diagram illustrating a third view of a battery pack exhaust structure according to an embodiment of the utility model;

FIG. 4 is a schematic view of an explosion-proof valve mounting beam according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a structure of an absorbent member according to an embodiment of the present utility model;

fig. 6 is a partial structure diagram of a battery pack according to a second embodiment of the present utility model;

fig. 7 is a partial view of a battery pack according to a second embodiment of the present utility model;

reference numerals illustrate:

1. a first side rail; 2. a second side rail; 201. an explosion-proof valve mounting beam; 202. a connecting beam; 3. a third side rail; 301. a short cross beam; 302. a U-shaped beam; 4. a battery module; 11. a reinforcing beam; 10. an outer ventilation port; 20. an inner ventilation port; 30. a gas exchange passage; 40. a moisture absorbing member; 50. a module accommodating chamber; 60. an electrical component accommodation chamber; 100. an explosion-proof valve; 200. and (5) a mounting surface.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be noted that, if terms indicating an orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are presented, they are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to 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, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present utility model, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; 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 of ordinary skill in the art in combination with specific cases.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

The embodiment relates to a battery pack exhaust structure, which is arranged on a shell of a battery pack, so that the improvement of the condensation environment in the battery pack and the improvement of the safety performance of the battery pack can be facilitated.

In the overall structure, the battery pack venting structure of the present embodiment is shown in fig. 1 to 4, in which the case of the battery pack has an explosion-proof valve mounting beam 201, and a cavity is formed inside the explosion-proof valve mounting beam 201. The battery pack venting structure mainly includes an outer vent 10 provided on the side of the explosion-proof valve mounting beam 201 facing the outside of the battery pack, and an inner vent 20 provided on the side of the explosion-proof valve mounting beam 201 facing the inside of the battery pack, and a gas exchange passage 30 formed of a cavity, both the outer vent 10 and the inner vent 20 being in communication with the gas exchange passage 30.

The explosion-proof valve 100 of the battery pack is installed at the outer ventilation port 10, and the inner ventilation port 20 is arranged to be staggered with the outer ventilation port 10, and at the same time, the inner ventilation port 20 is arranged to be apart from the electrical components in the battery pack.

Through the arrangement of the structure, the cavity structure inside the explosion-proof valve mounting beam 201 can be utilized as the gas exchange channel 30, and the ventilation part of the explosion-proof valve 100 and the inner ventilation opening 20 are staggered, so that external air can be effectively prevented from directly contacting with electric elements in the battery pack through the explosion-proof valve 100, the condensation phenomenon in the battery pack can be effectively improved, and the safety performance of the battery pack is improved. And when the battery pack is in thermal runaway, the diffusion and the discharge of the gas in the battery pack are facilitated. The inner ventilation opening 20 also has a certain fire filtering function, so that a fire filtering device on the explosion-proof valve 100 can be omitted, and the cost is saved.

In a specific structure, as shown in fig. 1 to 4, the explosion-proof valve mounting beam 201 is formed with a plurality of cavities inside, so that the cavities therein can be utilized as the gas exchange channels 30. The outer vent 10 is provided on the side of the explosion-proof valve mounting beam 201 facing the outside of the battery pack, that is, on the outer surface of the explosion-proof valve mounting beam 201. The inner ventilation opening 20 is provided at the side of the explosion-proof valve mounting beam 201 facing the inside of the battery pack, that is, on the inner surface of the explosion-proof valve mounting beam 201. The outer ventilation opening 10 and the inner ventilation opening 20 are respectively located at both ends of the gas exchange channel 30 and communicate with the gas exchange channel 30.

The explosion-proof valve 100 is mounted at the outer vent 10 of the explosion-proof valve mounting beam 201 through a connector, and the vent portion of the explosion-proof valve 100 communicates with the outer vent 10, so that air can enter the gas exchange passage 30 from the vent portion of the explosion-proof valve 100 and then enter the battery pack through the inner vent 20. When the thermal runaway of the battery pack occurs, the gas in the battery pack enters the gas exchange channel 30 through the inner ventilation opening 20, and then is discharged to the outside of the battery pack through the outer ventilation opening 10 and the ventilation part of the explosion-proof valve 100.

In this example, the area of the inner vent 20 is larger than the area of the vent membrane of the explosion proof valve in the projection onto the mounting surface 200 of the explosion proof valve. The arrangement is beneficial to the efficiency of external gas entering the battery pack, and is also beneficial to the diffusion and discharge of gas in the battery pack when the battery pack is out of control.

In order to facilitate preventing the condensation phenomenon of the electrical components, in this embodiment, the distance a between the central axis of the explosion-proof valve 100 and the central axis of the inner ventilation opening 20 should be greater than 100mm, and in a preferred embodiment, the distance a should satisfy the following relationship: 100mm < a < 700mm. In specific implementation, the distance a may be set to be, for example, 110mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm or 690mm, etc., so as to better prevent the electric element from condensation, protect the electric element, and simultaneously implement the arrangement of the inner ventilation openings 20.

In order to absorb moisture in the air in the battery pack, in this embodiment, a moisture absorbing member 40 is provided in the gas exchange passage 30 at a position near the inner ventilation opening 20. The moisture absorbing member 40 is detachably attached to the explosion-proof valve mounting beam 201, so that the replacement of the moisture absorbing member 40 is facilitated and

referring to fig. 5, the absorbent member 40 of the present embodiment has a rectangular block shape, and the absorbent member 40 specifically includes an absorbent sheet adhesively attached to the explosion-proof valve mounting beam 201, and the area ratio i of the absorbent sheet surface area to the outer ventilation opening 10 satisfies the following relationship: 1 < i < 5, so as to improve the moisture absorption effect and further avoid the occurrence of internal condensation.

In practice, the ratio i of the surface area of the absorbent sheet to the area of the outer ventilation opening 10 may be, for example, 2, 3 or 4. And the moisture absorbing sheet may be adhered to the inside of the explosion-proof valve mounting beam 201 by a back adhesive or a double-sided adhesive tape and disposed adjacent to the inner ventilation opening 20. To facilitate the installation of the absorbent sheet. It should be noted that the absorbent sheet of this embodiment may be a mature product of the prior art. It will be understood, of course, that the absorbent member 40 of the present embodiment may take the form of other products capable of removing moisture.

According to the exhaust channel structure of the battery pack, through the outer ventilation port 10, the inner ventilation port 20 and the gas exchange channel 30, the ventilation part of the explosion-proof valve 100 can avoid the electric element in the battery pack body, so that the condensation phenomenon in the battery pack can be effectively improved, the safety performance of the battery pack is improved, the exhaust of gas in the battery pack is also facilitated when the heat is out of control, meanwhile, the inner ventilation port 20 also has a certain fire filtering function, a fire filtering device on the explosion-proof valve 100 can be omitted, the cost is saved, and the use effect is good.

Example two

The present embodiment relates to a battery pack having a battery pack venting structure as described above provided on a case thereof as shown in fig. 5 and 6.

Specifically, the casing of the battery pack specifically includes two first side rails 1 that are arranged in opposition, and a second side rail 2 and a third side rail 3 that are connected between the two first side rails 1, and a module accommodating chamber 50 and an electrical component accommodating chamber 60 are defined between the second side rail 2 and the third side rail 3 and the two first side rails 1, and the second side rail 2 includes two explosion-proof valve mounting rails 201 that are arranged in symmetrical fashion, and a connecting rail 202 that is connected between the two explosion-proof valve mounting rails 201. Wherein, two explosion-proof valve mounting beams 201 are provided with explosion-proof valves 100, so as to reduce the risk of fire when the battery pack is out of control.

With continued reference to fig. 5 and 6, a first beam and a second beam are disposed between the second side beam 2 and the third side beam 3 at intervals, two ends of the first beam are respectively connected to the two first side beams 1, and two ends of the second beam are also respectively connected to the two first side beams 1. The first and second cross members and the two first side rails 1 enclose the above-described module accommodating chamber 50.

In the present embodiment, the electrical component accommodation cavities 60 are two disposed at both ends of the module accommodation cavity 50. Wherein one of the electric component accommodation chambers 60 is defined between the second side rail 2 and the first cross rail. The third side sill 3 specifically includes two short cross members 301 connected to the two first side sills 1, respectively, and a U-shaped beam 302 connected between the two short cross members 301. Another electric component accommodation chamber 60 is formed corresponding to a side of the U-shaped beam 302 facing the inside of the battery pack.

It should be noted that, the electrical components in the electrical component accommodating cavity 60, such as a wire harness, a copper bar, a BDU, a BMS slave board, a BMS motherboard, or a high-voltage connection electrical component, may be appropriately arranged by selecting a suitable position according to actual requirements. It will of course be appreciated that the arrangement of the electrical components in the electrical component receiving cavity 60 may also refer to arrangements of the prior art.

In order to facilitate improvement of the structural strength of the battery pack case, in this embodiment, the reinforcing beam 11 is disposed in the module accommodating chamber 50, and two ends of the reinforcing beam 11 are connected to the beam side rails. The reinforcing beam 11 is particularly located between the first beam and the second beam, so that not only can the structural strength of the housing be improved, but also the arrangement and fixation of the battery module 4 can be facilitated.

In this embodiment, a plurality of battery modules 4 are arranged in the module accommodating chamber 50 side by side, and the plurality of battery modules 4 are adhered and fixed on the liquid cooling plate at the bottom of the housing. The arrangement of the liquid cooling plate is beneficial to heat dissipation of the battery module 4, and is beneficial to prolonging the service life of the battery pack.

It should be noted that other structures not described in the battery pack, such as the specific structures of the components of the upper case of the battery pack, the battery module, etc., may be referred to the prior art.

The battery pack of this embodiment is favorable to improving the condensation environment in the battery pack through adopting the battery pack exhaust passage structure of embodiment one, and also is favorable to promoting the security performance of battery pack, also is favorable to realizing the fire filtering function of battery pack simultaneously to can save the fire filtering device on the explosion-proof valve 100, thereby be favorable to saving the cost.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A battery package exhaust structure, its characterized in that:

the battery pack exhaust structure is arranged on a shell of the battery pack, and the shell is provided with an explosion-proof valve mounting beam with a cavity formed inside;

2. The battery pack venting structure of claim 1, wherein:

and the area of the inner ventilation opening is larger than that of the ventilation film of the explosion-proof valve due to the projection of the inner ventilation opening on the mounting surface of the explosion-proof valve.

3. The battery pack venting structure of claim 1, wherein:

the distance a between the central axis of the explosion-proof valve and the central axis of the inner ventilation opening meets the following relation: 100mm < a < 700mm.

4. A battery pack venting structure according to any one of claims 1 to 3, wherein:

and a moisture absorbing piece is arranged in the gas exchange channel and close to the inner ventilation port.

5. The battery pack venting structure of claim 4, wherein:

the moisture absorption piece is detachably connected to the explosion-proof valve mounting beam.

6. The battery pack venting structure of claim 5, wherein:

the moisture absorbing piece comprises a moisture absorbing sheet which is connected to the explosion-proof valve mounting beam in an adhesive mode, and the area ratio i of the surface area of the moisture absorbing sheet to the area of the outer ventilation opening meets the following relation: 1 < i < 5.

7. A battery pack, characterized in that:

a battery pack exhaust structure according to any one of claims 1 to 6 is provided on a case of the battery pack.

8. The battery pack according to claim 7, wherein:

the shell comprises two first side beams which are oppositely arranged, a second side beam and a third side beam which are connected between the two first side beams, a module accommodating cavity and an electric element accommodating cavity are defined between the second side beam and the third side beam as well as between the two first side beams, and the second side beam comprises two inclined explosion-proof valve mounting beams which are symmetrically arranged, and a connecting beam which is connected between the two explosion-proof valve mounting beams.

9. The battery pack of claim 8, wherein:

the module accommodating cavity is internally provided with a reinforcing beam, and two ends of the reinforcing beam are connected to the two side beams.

10. The battery pack of claim 8, wherein:

a plurality of battery modules are arranged in the module accommodating cavity side by side, and the battery modules are arranged on the liquid cooling plate at the bottom of the shell.