CN219203363U - Battery pack box and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack box and a battery pack. The battery pack box body comprises a beam structure, at least one part of the beam structure forms an exhaust channel, and the exhaust channel can be used for communicating the battery cell group accommodating cavity with the external space of the battery pack box body. The design does not need to integrate a special exhaust structure in the battery pack box body, but directly forms an exhaust channel on the beam structure, so that the material can be saved, the light-weight design of the battery pack box body can be realized, the energy density of the battery pack can be improved, the exhaust function of the battery pack box body can be ensured, and the thermal runaway risk of the battery pack can be reduced. The battery pack is low in thermal runaway risk and high in energy density by applying the battery pack box body.

Description

Battery pack box and battery pack

Technical Field

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

Background

The battery pack comprises a box body and a battery module arranged in the box body, and can be used as a power battery of the new energy automobile to provide power for a power system of the new energy automobile. Currently, a special exhaust structure is integrated on a box body of a battery pack for a thermal runaway exhaust scheme of the battery pack, and when a thermal runaway occurs in a battery module in the box body, gas generated by the battery module is guided to a specific position through the special exhaust structure, such as a side part or a top part of the box body, and then is exhausted out of the box body through a thermal runaway exhaust valve. Although the design can reduce the thermal runaway risk of the battery pack, a special exhaust structure is required to be integrated, the whole weight of the battery pack is increased, and the energy density of the unit weight of the battery pack is reduced.

Therefore, there is a need for a battery pack case to solve the above problems.

Disclosure of Invention

An object of the present utility model is to provide a battery pack case capable of reducing the risk of thermal runaway of the battery pack and contributing to an improvement in the energy density of the battery pack.

Another object of the present utility model is to provide a battery pack, which has low risk of thermal runaway and high energy density by using the battery pack case.

In order to achieve the above object, the following technical scheme is provided:

in a first aspect, a battery pack case is provided, the battery pack case has a battery cell group accommodating cavity therein, the battery pack case includes:

and an exhaust channel is formed in at least one part of the beam structure, and the exhaust channel can be used for communicating the cell group accommodating cavity with the external space of the battery pack box body.

As an alternative to the battery pack case, the beam structure includes an outer frame beam, at least a portion of which has a first one of the exhaust passages formed therein.

As an alternative scheme of the battery pack box body, a first air inlet hole which is respectively communicated with the first air exhaust channel and the battery cell group accommodating cavity is formed in the inner wall of the outer frame beam, and an air outlet hole which is respectively communicated with the first air exhaust channel and the outer space is formed in the outer wall of the outer frame beam.

As an alternative scheme of the battery pack box body, the first air inlet hole is provided with a one-way air inlet valve and/or the air outlet hole is provided with a one-way air outlet valve.

As an alternative scheme of the battery pack box body, the battery pack box body further comprises a waterproof breathable film, and the waterproof breathable film is arranged at the air outlet hole.

As an alternative to the battery pack case, the beam structure further includes an inner beam located inside the outer frame beam and fixed to the outer frame beam, at least a portion of the inner beam having a second exhaust passage formed therein among the exhaust passages, the second exhaust passage being in communication with the outer space through the first exhaust passage.

As an alternative scheme of the battery pack box body, a plurality of second air inlet holes which are respectively communicated with the battery cell group accommodating cavity and the second air exhaust channel are formed in the inner beam, and a one-way air inlet valve is arranged on the second air inlet holes.

As an alternative to the battery pack case, the battery pack case further comprises a heat insulating layer provided on an inner surface of the outer frame beam and/or on a surface of the inner beam facing the outer frame beam.

As an alternative scheme of the battery pack box body, the external frame beam comprises a first longitudinal beam, a second longitudinal beam and a cross beam, wherein the first longitudinal beam and the second longitudinal beam are arranged at intervals in parallel, the cross beam is connected between the first longitudinal beam and the second longitudinal beam, and the first exhaust channel is arranged in each of the first longitudinal beam, the second longitudinal beam and the cross beam;

the inner girder comprises an inner girder which is connected to the cross girder and is arranged at intervals parallel to the first girder and the second girder, and the second exhaust channel in the inner girder is communicated with the first exhaust channel in the cross girder.

In a second aspect, there is provided a battery pack comprising a battery pack case as described above.

Compared with the prior art, the utility model has the beneficial effects that:

the battery pack box body comprises a beam structure, at least one part of the beam structure forms an exhaust channel, and the exhaust channel can communicate the battery cell group accommodating cavity with the external space of the battery pack box body. The design does not need to integrate a special exhaust structure in the battery pack box body, but directly forms an exhaust channel on the beam structure, so that the material can be saved, the light-weight design of the battery pack box body can be realized, the energy density of the battery pack can be improved, the exhaust function of the battery pack box body can be ensured, and the thermal runaway risk of the battery pack can be reduced.

The battery pack provided by the utility model has the advantages of low thermal runaway risk and high energy density by applying the battery pack box body.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

Fig. 1 is a partial exploded view of a battery pack according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a beam structure according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the structure of the beam structure according to the embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of an outer frame beam provided in an embodiment of the present utility model;

fig. 5 is a schematic cross-sectional view of an inner rail provided in an embodiment of the present utility model.

Reference numerals:

200. a cell group;

1. a beam structure; 10. an outer frame beam; 100. a first exhaust passage; 101. a first air inlet hole; 102. an air outlet hole; 11. a first stringer; 12. a second stringer; 13. a first cross beam; 14. a second cross beam; 15. an inside stringer; 150. a second exhaust passage; 151. a second air inlet hole; 16. an inner cross member; 17. a partition plate;

2. a cover plate; 21. a main body portion; 211. a first reinforcing rib; 212. a second reinforcing rib; 213. a third reinforcing rib; 22. an explosion-proof section;

3. a bottom plate.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present utility model, the terms "upper," "lower," "left," "right," and the like are used for convenience of description and simplicity of operation based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the apparatus or element in question must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Fig. 1 shows a partial exploded view of a battery pack provided by the present utility model. As shown in fig. 1, the battery pack includes a battery pack case and a battery cell pack 200 accommodated in the battery pack case. In one embodiment, the battery pack may be used as a power battery for a new energy vehicle to power a power system of the new energy vehicle. Of course, in other embodiments, the battery pack may also be used as an energy storage power source of an energy storage device, and other devices that need to be configured with a chargeable and dischargeable power source, which are not illustrated herein.

In an embodiment, the battery cell set 200 is a battery cell stack, the traditional battery module outer frame is omitted, and a battery pack box is used for replacing the battery cell stack, wherein the tabs of the battery cells are welded at the top of the stack, and voltage and temperature samples in the battery pack are arranged at the top of the stack. Of course, in other embodiments, the battery cell assembly 200 may also be a battery module with an outer frame.

In fig. 1, the battery pack case includes a beam structure 1, a cover plate 2 and a bottom plate 3, where the beam structure 1 has a battery cell group accommodating cavity for accommodating the battery cell group 200, and the cover plate 2 is detachably fixed on the top of the beam structure 1, so that the battery cell group accommodating cavity of the battery pack case forms a closed state. During the charge and discharge process of the battery pack, the battery cell group 200 in the battery pack box body can generate heat, and the prior art mostly realizes the thermal management control of the battery pack through a thermal management system. When the battery pack is out of control, the gas generated by the battery cell assembly 200 needs to be discharged out of the battery pack box in time, so as to reduce the explosion risk of the battery pack.

In fig. 1, the cover plate 2 is detachably covered on the beam structure 1, and the cover plate 2 includes a main body portion 21 and an explosion-proof portion 22, wherein the melting point of the main body portion 21 is higher than that of the explosion-proof portion 22. When the battery pack is out of control, if the temperature of the battery pack box rises to a certain extent, the explosion-proof part 22 melts first, so that high-temperature gas is discharged, further deterioration is avoided, the main body part 21 can serve as the main body structure of the cover plate 2, the integral structural strength of the cover plate 2 is ensured, and the stressed deformation of the cover plate 2 is avoided.

In one embodiment, the explosion-proof part 22 is made of aluminum material, the main body part 21 is made of steel material, the melting point of the aluminum material is lower than that of the steel material, and when the cover plate 2 is heated to the melting point of the aluminum material, the explosion-proof part 22 is melted first, so that high-temperature gas is discharged. The explosion-proof section 22 and the main body section 21 are connected by welding.

In an embodiment, the explosion-proof portion 22 made of aluminum material is disposed at the rear side of the driving direction of the battery pack, and a plurality of explosion-proof portions 22 can be disposed according to the size of the battery pack, and the explosion-proof portions 22 are uniformly arranged at the rear side of the driving direction of the battery pack, so that the exhaust direction is far away from the direction of the passenger during the driving process, and the protection effect is increased. In addition, the battery pack box body can be additionally provided with an explosion-proof valve so as to improve the thermal runaway protection effect.

In an embodiment, the outer contour shape of the main body 21 is the same as the outer contour shape of the cover plate 2, the main body 21 is provided with an exhaust port, and the explosion-proof part 22 is fixedly connected to the main body 21 and covers the exhaust port. The design can ensure that even if the explosion-proof part 22 melts at high temperature, the whole cover plate 2 can be fixedly connected with the beam structure 1, and the main body part 21 of the cover plate 2 is prevented from falling on the battery cell group 200 due to the melting of the explosion-proof part 22.

In one embodiment, the body portion 21 has a strength that is higher than the strength of the explosion-proof portion 22. The design can ensure the integral structural strength of the cover plate 2 and avoid the integral stress deformation of the cover plate 2.

In one embodiment, the main body 21 is formed with a first reinforcing rib 211, and the first reinforcing rib 211 divides the interior of the main body 21 into a plurality of areas, and at least one explosion-proof portion 22 is disposed in each area. In fig. 1, the first reinforcing rib 211 has a cross shape, dividing the interior of the main body 21 into four areas, each of which is provided with an explosion-proof portion 22. Of course, in other embodiments, the shape of the first reinforcing rib 211 may be a groined type, a rich type, etc., and is specifically designed according to the size of the area of the cover plate 2 and the size of the cell assembly 200, which is not limited herein. Furthermore, in other embodiments, the number of explosion-proof portions 22 in each area may be anywhere between 2-30, and the area of each explosion-proof portion 22 may be designed according to specific needs without limitation. The first reinforcing rib 211 may be integrally formed on the body portion 21 by pressing.

In one embodiment, the explosion-proof portion 22 is located at the rear side of the main body portion 21 in the traveling direction. The explosion-proof part 22 made of aluminum material is arranged at the rear side of the running direction of the battery pack, a plurality of explosion-proof parts 22 can be arranged according to the size of the battery pack, and the explosion-proof parts 22 are uniformly distributed at the rear side of the running direction of the battery pack, so that the exhaust direction is far away from the direction of passengers in the running process, and the protection effect is improved. In fig. 1, the explosion-proof portion 22 in each region partitioned by the first reinforcing bead 211 is located at the rear side of the region in the traveling direction. Specifically, the explosion-proof portions 22 in the four regions are each located at the rear side of the region in the running direction. In addition, the battery pack box body can be additionally provided with an explosion-proof valve so as to improve the thermal runaway protection effect.

In an embodiment, the edge of the main body 21 forms a second reinforcing rib 212, the second reinforcing rib 212 is annular, and a fixing hole is formed on the second reinforcing rib 212, and a bolt passes through the fixing hole to be fixedly connected with the beam structure 1. The second reinforcing rib 212 may be integrally formed on the main body portion 21 by pressing.

In an embodiment, the third reinforcing ribs 213 are formed on the main body 21, and the plurality of third reinforcing ribs 213 are disposed on one side of the explosion-proof portion 22 at intervals in parallel, and the third reinforcing ribs 213 are used to improve the structural strength of the main body 21, so that the structural strength of the main body 21 is not affected even if the explosion-proof portion 22 melts.

In one embodiment, the ratio r of the area of the explosion-proof portion 22 to the area of the cover plate 2 is such that r satisfies: r is more than or equal to 0.25 and less than or equal to 0.75.r may take any number between 0.25 and 0.75 and is not illustrated herein. The design makes the most area of the cover plate 2 be the explosion-proof part 22 made of low-melting point materials, so that the thermal runaway risk of the battery pack can be effectively reduced.

In one embodiment, the battery pack case should also include at least a fixing structure for fixing the battery cell stack 200, and a fixing structure for fixing other electrical components, thermal management components, and the like. The fixing structure is a well known technology for those skilled in the battery art, and will not be described in detail herein.

Fig. 2 shows a schematic structural view of the beam structure 1 provided by the present utility model. As shown in fig. 2, an exhaust channel is formed in at least a portion of the beam structure 1, and the exhaust channel can communicate the cell group accommodating cavity with an external space of the battery pack box body, so as to timely discharge hot air in the cell group accommodating cavity to the external space. The design does not need to integrate a special exhaust structure in the battery pack box body, but directly forms an exhaust channel on the beam structure 1, so that the material can be saved, the light-weight design of the battery pack box body can be realized, the energy density of the battery pack can be improved, the exhaust function of the battery pack box body can be ensured, and the thermal runaway risk of the battery pack can be reduced.

Beam structure 1 includes an outer frame beam 10, with at least a portion of outer frame beam 10 defining a first one of the exhaust passageways 100 therein. Illustratively, the plurality of external frame beams 10 are sequentially connected and enclosed to form an annular structure, and when the beam structure 1 does not include an internal beam, an internal space of the annular structure is a cell group accommodating space. A first exhaust channel 100 is formed in at least one external frame beam 10 of the plurality of external frame beams 10, a first air inlet hole 101 which is respectively communicated with the first exhaust channel 100 and the cell group accommodating space is formed on the inner wall of the external frame beam 10, and an air outlet hole 102 which is respectively communicated with the first exhaust channel 100 and the external space is formed on the outer wall of the external frame beam 10.

The first air inlet hole 101 is provided with a one-way air inlet valve and/or the air outlet hole 102 is provided with a one-way air outlet valve. Preferably, the first air intake hole 101 is provided with a one-way air intake valve. The one-way exhaust valve is arranged on the air outlet hole 102 to prevent the air in the external space from flowing into the battery pack box body from the first air inlet hole 101, and the one-way exhaust valve of the air outlet hole 102 ensures that the air can only be exhausted from the air outlet hole 102. In order to prevent outside moist air from entering the battery pack box body from the air outlet hole 102, the battery pack box body further comprises a waterproof breathable film, and the waterproof breathable film is arranged at the air outlet hole 102. This design allows the battery cell stack 200 within the battery pack case to remain dry. The waterproof and breathable membrane may pass through gas but not through liquid and solid.

When the beam structure 1 comprises an inner beam, a number of inner beams are fixed to the outer frame beams 10 and divide the inner space of the ring structure into a number of cell group accommodation spaces. At least one of the inner beams has a second exhaust passage 150 formed therein, the second exhaust passage 150 communicating with the first exhaust passage 100. Preferably, the inner beam is provided with a second air inlet hole 151, and the second air inlet hole 151 is provided with a one-way air inlet valve, so that air in the accommodating space of one cell group is prevented from entering the accommodating space of other cell groups from the second air inlet hole 151.

The battery pack box body with the beam structure 1 can be suitable for a soft-pack battery cell battery pack, and the internal exhaust channel can enable battery thermal runaway exhaust to be more controllable.

In one embodiment, as shown in fig. 2, the beam structure 1 is rectangular, the plurality of external frame beams 10 are respectively a first longitudinal beam 11, a second longitudinal beam 12, a first transverse beam 13 and a second transverse beam 14, the first longitudinal beam 11 and the second longitudinal beam 12 are arranged in parallel at intervals, the first transverse beam 13 and the second transverse beam 14 are arranged in parallel at intervals, and the first transverse beam 13 and the second transverse beam 14 are used for fixedly connecting the first longitudinal beam 11 and the second longitudinal beam 12. The first longitudinal beam 11 and the second longitudinal beam 12 are respectively provided with a first exhaust channel 100, and the first longitudinal beam 11 and the second longitudinal beam 12 are respectively provided with a first air inlet hole 101 and an air outlet hole 102. The gas of the battery pack case can enter the first exhaust passage 100 in the outer frame beam 10 through the first gas inlet holes 101 and then be exhausted through the gas outlet holes 102. Of course, in other embodiments, the battery pack case may be other types of polygons, and the number of outer frame beams 10 may be any number between 4 and 12.

In an embodiment, the beam structure 1 further comprises a partition 17, the partition 17 is fixed between the first longitudinal beam 11 and the second longitudinal beam 12, the partition 17 is parallel to the first transverse beam 13 and the second transverse beam 14, and the partition 17 is used for separating independent installation spaces in the beam structure 1 so as to facilitate the installation of other parts in the battery pack. The space formed by the partition 17, the first longitudinal beam 11, the second longitudinal beam 12 and the first transverse beam 13 is used for placing the battery cell group 200.

In one embodiment, the inside girder includes an inside girder 15, a second air intake hole 151 communicating with the second air intake hole 150 is formed in the inside girder 15, the inside girder is located inside the outside girder 10 and is fixed to the outside girder 10, the second air intake hole 150 communicates with the first air intake hole 100. The arrangement of the inside longitudinal beam 15 can improve the structural strength of the battery pack case, and simultaneously partition the beam structure 1 into at least two accommodating chambers, and manage the cell group 200 in regions. Then, by forming the second exhaust passage 150 in the side sill 15 and providing the second intake holes 151 on the side sill 15, the gas near the middle portion of the girder construction 1 can also enter the second exhaust passage 150 through the second intake holes 151 and then be discharged through the gas outlet holes 102 of the first exhaust passage 100. As shown in fig. 2, the inside longitudinal beams 15 are disposed in parallel with the first and second longitudinal beams 11, 12 at a spacing, and the inside longitudinal beams 15 are fixedly connected to the first cross member 13 and the bulkhead 17.

In one embodiment, the inner girder further comprises an inner cross member 16, and the inner cross member 16 is fixedly connected between the inner longitudinal member 15 and the outer frame girder 10. In fig. 2, an inside cross member 16 is fixedly connected between the inside longitudinal member 15 and the first longitudinal member 11, and an inside cross member 16 is fixedly connected between the inside longitudinal member 15 and the second longitudinal member 12. The arrangement of the inner cross beam 16 can improve the structural strength of the battery pack box body, and meanwhile, the space between the inner longitudinal beam 15 and the first longitudinal beam 11 and the second longitudinal beam 12 is divided into two accommodating cavities, namely, the beam structure 1 comprises four accommodating cavities, and four groups of battery cell groups 200 can be accommodated.

Fig. 3 shows a schematic view of the structure of the beam structure 1 according to the present utility model in the direction of gas flow. As shown in fig. 3, the first longitudinal beam 11, the second longitudinal beam 12 and the first transverse beam 13 are respectively provided with a first exhaust passage 100, the inside longitudinal beam 15 is connected to the transverse beam 13 and is arranged at intervals parallel to the first longitudinal beam 11 and the second longitudinal beam 12, and the second exhaust passage 150 in the inside longitudinal beam 15 is communicated with the first exhaust passage 100 in the first transverse beam 13. Wherein, the gas near the first longitudinal beam 11 and the second longitudinal beam 12 enters the first exhaust passage 100 from the first air inlet holes 101 on the first longitudinal beam 11 and the second longitudinal beam 12, and then is exhausted from the air outlet holes 102 on the first longitudinal beam 11 and the second longitudinal beam 12. The gas near the inside longitudinal beam 15 enters the second exhaust passage 150 from the second intake holes 151 on the inside longitudinal beam 15 and then is discharged from the gas outlet holes 102 on the first cross member 13 via the first exhaust passage 100 on the first cross member 13. In fig. 3, the first exhaust passage 100 of the first cross member 13 is mainly used to communicate with the second exhaust passage 150 of the inside longitudinal member 15, and exhaust the gas in the inside longitudinal member 15.

In an embodiment, the faces of the inside longitudinal beam 15 facing the first longitudinal beam 11 and the second longitudinal beam 12 are provided with the second air intake holes 151, that is, the faces of the inside longitudinal beam 15 close to the battery cell group 200 are provided with the second air intake holes 151, so as to improve the exhaust efficiency.

In one embodiment, a third exhaust passage may also be provided within the inner cross member 16 to improve thermal runaway exhaust efficiency. The third exhaust channel in the inner cross member 16 communicates with the first exhaust channel 100 in the first longitudinal member 11 and/or the second longitudinal member 12.

In an embodiment, in order to reduce the influence of the heat generated by the cell stack 200 on the battery pack case, avoid thermal deformation of the battery pack case, and avoid influence of the beam structure 1 heated by the high-temperature and high-pressure gas on the cell stack 200, the battery pack case further comprises a heat insulation layer, wherein the heat insulation layer is provided on the inner surface of the outer frame beam 10 and/or on the surface of the inner beam facing the outer frame beam 10, i.e. the heat insulation layer is provided on the inner surface of the outer frame beam 10, and the heat insulation layer is provided on the surface of the inner beam facing the outer frame beam 10. The heat insulation layers are arranged on the surfaces, close to the battery cell groups 200, of the outer frame beams 10, the heat insulation layers are arranged on the surfaces, close to the battery cell groups 200, of the inner longitudinal beams 15, and the heat insulation layers are arranged on the surfaces, close to the battery cell groups 200, of the inner cross beams 16. Of course, it should be noted that the heat insulating layer on the outer frame beam 10 is provided with a first avoiding hole for avoiding the first air inlet hole 101, and the heat insulating layer on the inner longitudinal beam 15 is provided with a second avoiding hole for avoiding the second air inlet hole 151, so as to reduce the influence of the heat insulating layer on the air flow.

Fig. 4 shows a schematic cross-sectional view of an outer frame beam 10 provided by the present utility model. As shown in fig. 4, reinforcing ribs are provided in the outer frame girder 10 to improve the structural strength of the outer frame girder 10. Illustratively, three reinforcing ribs are provided in the outer frame girder 10, and at this time, the first exhaust passage 100 in the outer frame girder 10 is divided into a plurality of passages, and in order to ensure the exhaust efficiency, the first air inlet holes 101 and the air outlet holes 102 may be provided at the corresponding passages, and of course, the first air inlet holes 101 may be provided only at any number of passages, which is not limited herein. Of course, in other embodiments, the outer frame beams 10 may not be provided with reinforcing bars. In addition, in fig. 4, the first air inlet hole 101 is disposed opposite to the air outlet hole 102 to improve the air exhaust efficiency.

Fig. 5 shows a schematic cross-sectional view of an inside longitudinal beam 15 provided by the present utility model. As shown in fig. 5, reinforcing ribs are provided in the inside longitudinal beam 15 to improve the structural strength of the inside longitudinal beam 15. Illustratively, three reinforcing ribs are provided in the inside longitudinal beam 15, and at this time, the second exhaust passage 150 in the inside longitudinal beam 15 is divided into a plurality of passages, and in order to ensure the exhaust efficiency, the second air intake holes 151 may be provided at the corresponding passages, and of course, the second air intake holes 151 may be provided only at any number of passages, which is not limited thereto. Of course, in other embodiments, the inside longitudinal beam 15 may not be provided with a reinforcing rib. The second air intake holes 151 are provided at both sides of the inside longitudinal beam 15, and since the second air intake holes 151 at both sides of the inside longitudinal beam 15 are offset, only one side of the second air intake holes 151 is shown in the cross-sectional view of fig. 5. Of course, in other embodiments, the second air intake holes 151 on both sides of the inside longitudinal beam 15 may be disposed opposite to each other, and by providing a check valve on the second air intake holes 151, it is ensured that the high temperature air can only enter the second exhaust passage 150 from the second air intake holes 151.

In one embodiment, the inner cross member 16 may or may not have ribs, and may be specifically designed according to the exhaust requirements, which is not illustrated herein.

Note that in the description of this specification, a description referring to the terms "one embodiment," "other embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing description is only of the preferred embodiments of the utility model and the technical principles employed. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. A battery pack case having a cell pack accommodating cavity therein, the battery pack case comprising:

a beam structure, wherein an exhaust channel is formed in at least one part of the beam structure, and the exhaust channel can communicate the electric core group accommodating cavity with the external space of the battery pack box body;

the cover plate is detachably covered on the beam structure and comprises a main body part and an explosion-proof part, and the melting point of the main body part is higher than that of the explosion-proof part.

2. The battery pack case of claim 1, wherein the beam structure comprises an outer frame beam having a first one of the vent passageways formed therein at least in part.

3. The battery pack case according to claim 2, wherein the inner wall of the outer frame beam is provided with a first air inlet hole which is respectively communicated with the first air exhaust channel and the cell group accommodating cavity, and the outer wall of the outer frame beam is provided with an air outlet hole which is respectively communicated with the first air exhaust channel and the outer space.

4. A battery pack case according to claim 3, wherein the first air inlet hole is provided with a one-way air inlet valve and/or the air outlet hole is provided with a one-way air outlet valve.

5. The battery pack case of claim 3, further comprising a waterproof and breathable membrane disposed at the air outlet.

6. The battery pack case according to claim 2, wherein the beam structure further comprises an inner beam that is positioned inside and fixed to the outer frame beam, at least a portion of the inner beam having a second one of the exhaust passages formed therein, the second exhaust passage being in communication with the external space through the first exhaust passage.

7. The battery pack case according to claim 6, wherein the inner beam is provided with a plurality of second air intake holes respectively communicating with the cell group accommodation cavity and the second air exhaust passage, and the second air intake holes are provided with one-way air intake valves.

8. The battery pack case according to claim 7, further comprising a thermal insulation layer provided on an inner surface of the outer frame beam and/or on a surface of the inner beam facing the outer frame beam.

9. The battery pack case according to claim 6, wherein the outer frame beam comprises a first longitudinal beam, a second longitudinal beam and a cross beam, the first longitudinal beam and the second longitudinal beam are arranged in parallel at intervals, the cross beam is connected between the first longitudinal beam and the second longitudinal beam, and the first exhaust channel is arranged in each of the first longitudinal beam, the second longitudinal beam and the cross beam;

the inner girder comprises an inner girder which is connected to the cross girder and is arranged at intervals parallel to the first girder and the second girder, and the second exhaust channel in the inner girder is communicated with the first exhaust channel in the cross girder.

10. A battery pack comprising the battery pack case according to any one of claims 1 to 9.

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