CN220774640U - Battery device - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery device, which comprises: a plurality of batteries, a support, the batteries comprising a pressure relief structure; the support piece comprises an upper plate, a lower plate and a plurality of isolating bars, wherein the upper plate and the lower plate are oppositely arranged at intervals, the isolating bars are positioned between the upper plate and the lower plate, the upper plate, the lower plate and the isolating bars are integrally formed, the battery is arranged on one side of the upper plate, which is away from the lower plate, and the side surface of the battery, which is provided with the pressure release structure, faces the support piece; the isolating bars are used for separating the space between the upper plate and the lower plate into one or more exhaust cavities, and the exhaust cavities extend along the first direction; in the first direction, the dimension of the middle position of the exhaust cavity in the second direction is smaller than the dimension of the position of at least one end of the exhaust cavity in the second direction, and the first direction and the second direction are perpendicular. The exhaust cavity in the battery device has a faster exhaust effect.

Description

Battery device

Technical Field

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

Background

In the related art, a battery device includes a battery and a support member for supporting the battery, in which a vent chamber may be formed, and when the battery is thermally out of control, high-pressure and high-temperature gas discharged from the battery may enter the vent chamber and be discharged outside a battery case. However, in the related art, the vent chamber is generally of a rectangular structure, and the vent speed of the vent chamber is slow in the rectangular structure, so that high-pressure high-temperature gas is liable to damage other batteries.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The utility model provides a battery device which can solve the technical problem that an exhaust cavity in the battery device is low in exhaust speed.

The battery device includes:

a plurality of cells, the cells comprising a pressure relief structure;

the support piece comprises an upper plate, a lower plate and a plurality of isolating strips, wherein the upper plate and the lower plate are oppositely arranged at intervals, the isolating strips are positioned between the upper plate and the lower plate, the upper plate, the lower plate and the isolating strips are integrally formed, the battery is arranged on one side, away from the lower plate, of the upper plate, and the side, provided with the pressure relief structure, of the battery faces the support piece;

the spacer is used for separating the space between the upper plate and the lower plate into one or more exhaust chambers, and the exhaust chambers extend along a first direction;

in the first direction, the dimension of the middle position of the exhaust cavity in the second direction is smaller than the dimension of the position of at least one end of the exhaust cavity in the second direction, and the second direction is perpendicular to the first direction.

The utility model sets the strip-shaped exhaust cavity into a structure with a narrow middle end part and a wide middle end part, and the exhaust cavity has a certain guiding effect on the gas in the exhaust cavity, so that the exhaust cavity can rapidly exhaust the high-pressure gas from a wider end part.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a schematic view of the structure of an exemplary embodiment of a battery device of the present disclosure;

FIG. 2 is a schematic view of a support and battery in an exemplary embodiment of a battery device of the present disclosure;

FIG. 3 is a schematic view of the structure of a support in an exemplary embodiment of a battery device of the present disclosure;

FIG. 4 is a schematic view of a structure of a support member from another perspective in an exemplary embodiment of a battery device of the present disclosure;

FIG. 5 is a bottom view of an upper plate and spacer in an exemplary embodiment of a battery device of the present disclosure;

fig. 6 is a schematic view of the structure of a lower plate in an exemplary embodiment of a battery device of the present disclosure;

fig. 7 is a schematic view of a structure of a battery in an exemplary embodiment of a battery device of the present disclosure;

FIG. 8 is a schematic view of the structure of a separator strip in another exemplary embodiment of a battery device of the present disclosure;

fig. 9 is a bottom view of an upper plate and separator bar in another exemplary embodiment of a battery device of the present disclosure.

Reference numerals illustrate:

1. a battery; 11. a pressure relief structure; 2. a support; 22. a lower plate; 21. an upper plate; 211. a through hole; 23. a spacer; 3. an exhaust chamber; 4. an electrical device; 5. a battery case; 51. a battery integration region; 52. an electric appliance integration area; 6. a blocking portion; 7. a first groove; 93. a boss; 94. a third groove; x, a first direction; y, second direction.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being "on," "under," or "in" or "out" of another element or feature being "on," "under" or "in" or "out" of the other element or elements, it can be directly connected to the other element or elements, or indirectly connected to the other element or elements via intervening elements.

The present exemplary embodiment first provides a battery device, as shown in fig. 1-7, fig. 1 is a schematic structural view of an exemplary embodiment of the battery device of the present disclosure, fig. 2 is a schematic structural view of a support member and a battery in an exemplary embodiment of the battery device of the present disclosure, fig. 3 is a schematic structural view of a support member in an exemplary embodiment of the battery device of the present disclosure, fig. 4 is a schematic structural view of another view of a support member in an exemplary embodiment of the battery device of the present disclosure, fig. 5 is a bottom view of an upper plate and a spacer in an exemplary embodiment of the battery device of the present disclosure, fig. 6 is a schematic structural view of a lower plate in an exemplary embodiment of the battery device of the present disclosure, and fig. 7 is a schematic structural view of a battery in an exemplary embodiment of the battery device of the present disclosure.

The battery device includes: a plurality of cells 1, a support 2, the cells 1 comprising a pressure relief structure 11; the support 2 comprises an upper plate 21, a lower plate 22 and a plurality of isolating bars 23, wherein the upper plate 21 and the lower plate 22 are oppositely arranged at intervals, the isolating bars 23 are positioned between the upper plate 21 and the lower plate 22, the upper plate 21, the lower plate 22 and the isolating bars 23 are integrally formed, the battery 1 is arranged on one side of the upper plate 21, which is away from the lower plate 22, and the side surface of the battery 1, which is provided with the pressure release structure 11, faces the support 2; the barrier ribs 23 serve to partition the space between the upper plate 21 and the lower plate 22 into a plurality of exhaust chambers 3, the exhaust chambers 3 extending in the first direction X; in the first direction X, a dimension S1 of the middle position of the exhaust chamber 3 in the second direction Y is smaller than a dimension S2 of the position of at least one end of the exhaust chamber 3 in the second direction Y, and the first direction X and the second direction Y are perpendicular.

In the present exemplary embodiment, the high-pressure gas entering the exhaust chamber 3 needs to be discharged from the end of the exhaust chamber 3, and the strip-shaped exhaust chamber 3 is provided in the present exemplary embodiment in a structure in which the middle narrow end is wide, and the exhaust chamber 3 of the structure has a certain guiding effect on the gas inside thereof, so that the high-pressure gas can be rapidly discharged from the wider end of the exhaust chamber.

In the first direction X, the intermediate position of the exhaust chamber 3 may be any position between both ends of the exhaust chamber 3.

In the present exemplary embodiment, the dimension of the exhaust chamber 3 in the first direction X is L, and the intermediate position of the exhaust chamber 3 may be any position having a minimum distance from the end of the exhaust chamber 3 of 1/3*L or more. That is, the middle position of the exhaust cavity 3 is any position with a distance of 1/6*L or less from the midpoint of the exhaust cavity 3. For example, the intermediate position of the degassing chamber 3 may be a midpoint position of the degassing chamber 3 in the first direction X.

In the present exemplary embodiment, as shown in fig. 1 to 7, a dimension S1 of the intermediate position of the exhaust chamber 3 in the second direction Y is smaller than a dimension S2 of the position of one end of the exhaust chamber 3 in the second direction Y, and a dimension S1 of the intermediate position of the exhaust chamber 3 in the second direction Y is larger than a dimension S3 of the position of the other end of the exhaust chamber 3 in the second direction Y; the end of the exhaust chamber 3 having a larger dimension in the second direction Y may form an exhaust end. This arrangement allows the exhaust end of the exhaust chamber to be of a larger size, thereby facilitating rapid exhaust of the exhaust chamber.

In the present exemplary embodiment, in the first direction X, the ratio of the dimension of the intermediate position of the exhaust chamber 3 in the second direction Y to the dimension of the position of at least one end of the exhaust chamber 3 in the second direction Y is 1/3 or more and 1/2 or less. For example, the ratio may be 1/3, 2/5, 1/2, etc.

In the present exemplary embodiment, as shown in fig. 1 to 7, the dimension of the exhaust chamber 3 in the second direction Y gradually increases from one end position of the exhaust chamber 3 to the other end position of the exhaust chamber 3 in the first direction X. This arrangement can reduce the resistance along the way inside the exhaust chamber 3, so that the exhaust chamber 3 can be easily exhausted quickly. The inner wall of the exhaust cavity 3 may be a plane or a smooth curved surface.

It should be appreciated that in other exemplary embodiments, spacer 23 may also divide the space between upper plate 21 and lower plate 22 into one exhaust chamber 3. As shown in fig. 8, a schematic structural view of a separator strip in another exemplary embodiment of a battery device of the present disclosure is shown. The spacer 23 divides the space between the upper plate 21 and the lower plate 22 into one exhaust chamber 3. In the first direction X, the dimension of the middle position of the exhaust chamber 3 in the second direction Y is smaller than the dimension of the position of at least one end of the exhaust chamber 3 in the second direction Y, and the first direction X and the second direction Y are perpendicular.

Further, it should be appreciated that in other exemplary embodiments, the exhaust chamber may also be exhausted through both ends. As shown in fig. 9, a bottom view of an upper plate and separator bar in another exemplary embodiment of a battery device of the present disclosure is provided. Wherein, in the first direction X, the dimension S1 of the middle position of the exhaust cavity 3 in the second direction Y is smaller than the dimension S2 of the two end positions of the exhaust cavity 3 in the second direction Y. In the present exemplary embodiment, the exhaust chamber 3 may be exhausted through a position where both ends are wider. In the first direction X, the dimension of the exhaust chamber 3 in the second direction Y may gradually increase from the middle position of the exhaust chamber 3 to the positions of both ends of the exhaust chamber 3. This arrangement also reduces the resistance along the way inside the exhaust chamber 3, thereby facilitating rapid exhaust of the exhaust chamber 3.

In the present exemplary embodiment, as shown in fig. 1 to 7, a plurality of cells 1 may be distributed in a first direction X and a second direction Y; the orthographic projection of the pressure release structures 11 of the plurality of cells 1 distributed in the first direction X on the projection plane may be located within the orthographic projection of the same exhaust chamber 3 on the projection plane, the projection plane being perpendicular to the distribution direction of the upper plate 21 and the lower plate 22. When the battery 1 is out of control, the high-pressure gas discharged from the battery 1 can enter the exhaust cavity 3 through the upper plate 21, and the high-pressure gas in the exhaust cavity 3 can be discharged out of the battery box through an explosion-proof valve on the battery box.

In the present exemplary embodiment, the pressure relief structure 11 may be formed by a score on the battery case. The score may be located on the outside of the battery case. The score may be a closed pattern, e.g., the score may be a circle, rectangle, triangle, irregular pattern, etc. The score may also be in a non-closed pattern, for example, the score may be in a "cross," T, "X," etc. The pressure release structure 11 can also be the thinning area that the punching press formed, and the pressure release structure also can be the thinning area of battery case self, and pressure release structure 11 can also be the paster of attaching on explosion-proof opening.

It should be noted that, when the pressure relief structure 11 is a solid structure such as a patch and a thinning area, the orthographic projection of the patch and the thinning area on the projection plane is the orthographic projection of the pressure relief structure on the projection plane; when the pressure relief structure 11 is formed by the notch with the closed shape, the orthographic projection of the area surrounded by the notch with the closed shape on the projection plane is the orthographic projection of the pressure relief structure on the projection plane; when the pressure relief structure 11 is formed by the non-closed-shape notch, the minimum circumcircle of the orthographic projection of the non-closed-shape notch on the projection plane is the orthographic projection of the pressure relief structure on the projection plane.

In this exemplary embodiment, as shown in fig. 1 to 7, the upper plate 21 may include weak portions, where the weak portions are disposed in a one-to-one correspondence with the batteries 1, and the orthographic projection of the pressure release structure 11 of the battery 1 on the projection plane and the orthographic projection of the corresponding weak portion on the projection plane at least partially coincide, and the projection plane is perpendicular to the distribution direction of the upper plate 21 and the lower plate 22; the orthographic projection of the weak portion on the projection surface is located within the orthographic projection of the exhaust chamber 3 on the projection surface, and the weak portion can be used to transmit the high-pressure gas discharged from the battery 1 into the exhaust chamber 3 when the battery 1 is thermally out of control. The projection plane is perpendicular to the distribution direction of the upper plate 21 and the lower plate 22.

In the present exemplary embodiment, as shown in fig. 1 to 7, the weak portion may be a through hole 211 formed in the upper plate 21, the through hole 211 communicating with the exhaust chamber 3. When the battery is thermally out of control, high-pressure gas released from the battery may enter the exhaust chamber 3 through the through-holes 211. It should be appreciated that in other exemplary embodiments, the weaknesses may be other structures, for example, the weaknesses may be a thinner baffle structure that may be broken by high pressure gas when the battery is thermally out of control, thereby communicating with the vent chamber 3, while the baffle structure may also avoid the escape of gel used to bond the battery into the vent chamber 3.

In this exemplary embodiment, as shown in fig. 1 to 7, each exhaust cavity 3 may correspond to a row of batteries 1, where the orthographic projection of the pressure release structure on the projection surface of the row of batteries 1 is located within the orthographic projection of the corresponding exhaust cavity 3 on the projection surface, and the exhaust cavity 3 is used for collecting the high-pressure gas released by the corresponding row of batteries. It should be understood that in other exemplary embodiments, each exhaust chamber 3 may also correspond to a plurality of rows of cells 1, where the front projection of the pressure relief structure on the projection surface of the plurality of rows of cells 1 is located within the front projection of the corresponding exhaust chamber 3 on the projection surface, and the exhaust chamber 3 may be used to collect the high-pressure gas released by the corresponding plurality of rows of cells.

In the present exemplary embodiment, as shown in fig. 1 to 7, the battery device may further include: the battery box 5 comprises a battery integrated area 51 and an electric appliance integrated area 52 which are distributed in the first direction X, the battery 1 is positioned in the battery integrated area 51, and the electric device 4 is positioned in the electric appliance integrated area 52; the blocking part 6 is blocked at one end of the exhaust cavity 3 close to the electric appliance integration area 52. The present exemplary embodiment seals the end of the exhaust chamber 3 near the electric appliance integration area 52 by the blocking portion 6, so that the high-pressure gas exhausted from the exhaust chamber 3 can be prevented from damaging the electric device 4. The electrical device 4 may be a high voltage distribution box, a battery management system, or the like.

In this exemplary embodiment, as shown in fig. 1 to 7, the blocking portion 6 may be disposed outside the support 2, and the blocking portion 6 abuts against one end of the exhaust chamber 3 near the electric appliance integration area 52.

In this exemplary embodiment, as shown in fig. 1 to 7, a plurality of first grooves 7 are further formed on the side of the upper plate 21 facing away from the lower plate 22, the first grooves 7 may be disposed in one-to-one correspondence with the batteries 1, and the batteries 1 may be disposed in the corresponding first grooves 7. In one aspect, the arrangement may facilitate battery assembly; on the other hand, the first recess 7 has a certain positioning effect on the battery, so that the battery 1 can be prevented from moving in the battery case. Wherein the weak portion may be provided on the bottom of the first groove 7.

In the present exemplary embodiment, as shown in fig. 1 to 7, a side of the barrier ribs 23 facing the lower plate 22 may be formed with second grooves extending in the extending direction of the barrier ribs 23. The second grooves can improve the heat-blocking capacity of the barrier ribs 23 due to the smaller thermal resistance of the air, so that the barrier ribs 23 can effectively prevent the thermal runaway range of the battery from being diffused. The second recess may be formed by stamping, etching, milling, etc.

In this exemplary embodiment, as shown in fig. 1 to 7, the lower plate 22 may include a protrusion 93 facing the spacer 23, a third groove 94 may be formed on a side of the protrusion 93 facing away from the spacer 23, the protrusion 93 and the second groove are correspondingly disposed, the protrusion 93 may be disposed in the second groove corresponding thereto in a matching manner, and the third groove 94 is at least partially located in the second groove corresponding thereto, and the third groove on the side of the protrusion 93 facing away from the spacer 23 corresponds to the second groove in which the protrusion 93 is located. On the one hand, the second grooves can also improve the heat resistance of the isolating bars 23; on the other hand, the third grooves 94 may increase the outer surface area of the lower plate 22, and thus may increase the heat dissipation capacity of the lower plate 22.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

In this exemplary embodiment, the battery may be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end surfaces and a curved surface between the two circular end surfaces.

In other exemplary embodiments, the battery may be a prismatic battery, that is, the battery may be a quadrangular battery, where the quadrangular battery mainly refers to a prismatic shape, but it is not strictly limited whether each side of the prism is necessarily a strictly defined straight line, and corners between sides are not necessarily right angles, and may be arc transitions.

The battery can be a laminated battery, the laminated battery is convenient to group, and the battery with longer length can be obtained through processing. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Alternatively, the battery may be a wound battery in which a first pole piece, a second pole piece opposite in electrical property to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

In the present exemplary embodiment, the battery device is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery can be square battery, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries. The battery may be a cylindrical battery, and the cylindrical battery may be disposed on the support plate, thereby forming a battery module.

The battery pack comprises a plurality of batteries and a box body, wherein the box body is used for fixing the plurality of batteries.

It should be noted that the battery pack includes a plurality of batteries, and a plurality of batteries are disposed in the case. Wherein, a plurality of batteries can be installed in the box after forming the battery module. Or, a plurality of batteries can be directly arranged in the box body, namely, the plurality of batteries do not need to be grouped, and the plurality of batteries are fixed by the box body.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

The drawings in the present disclosure relate only to the structures to which the present disclosure relates, and other structures may be referred to in general. The embodiments of the present disclosure and features in the embodiments may be combined with each other to arrive at a new embodiment without conflict. It will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the disclosed embodiments without departing from the spirit and scope of the disclosed embodiments, which are intended to be encompassed within the scope of the appended claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A battery device, characterized in that the battery device comprises:

-a plurality of cells (1), the cells (1) comprising a pressure relief structure (11);

the support (2), the support (2) comprises an upper plate (21) and a lower plate (22) which are opposite and are arranged at intervals, and a plurality of isolating strips (23) which are positioned between the upper plate (21) and the lower plate (22), wherein the upper plate (21), the lower plate (22) and the isolating strips (23) are integrally formed, the battery (1) is arranged on one side, away from the lower plate (22), of the upper plate (21), and the side surface, provided with the pressure relief structure (11), of the battery (1) faces the support (2);

the spacer (23) is used for separating the space between the upper plate (21) and the lower plate (22) into one or more exhaust chambers (3), and the exhaust chambers (3) extend along a first direction (X);

in the first direction (X), the dimension of the middle position of the exhaust cavity (3) in the second direction (Y) is smaller than the dimension of at least one end position of the exhaust cavity (3) in the second direction (Y), and the second direction (Y) is perpendicular to the first direction (X).

2. The battery device according to claim 1, wherein the dimension of the exhaust chamber (3) in the first direction (X) is L, and the intermediate position of the exhaust chamber (3) is any position having a minimum distance from the end of the exhaust chamber (3) of 1/3*L or more.

3. The battery device according to claim 1, characterized in that in the first direction (X), the dimension of the exhaust chamber (3) in the second direction (Y) at the middle position is smaller than the dimension of the exhaust chamber (3) in the second direction (Y) at both end positions;

the two ends of the exhaust cavity (3) form exhaust ends.

4. A battery device according to claim 3, characterized in that the dimensions of the exhaust chamber (3) in the second direction (Y) in the first direction (X) gradually increase from the middle position of the exhaust chamber (3) to the positions of the two ends of the exhaust chamber (3).

5. The battery device according to claim 1, characterized in that in the first direction (X), the dimension of the exhaust chamber (3) in the middle position in the second direction (Y) is smaller than the dimension of the exhaust chamber (3) in the second direction (Y) in one end position, and the dimension of the exhaust chamber (3) in the middle position in the second direction (Y) is larger than the dimension of the exhaust chamber (3) in the second direction (Y) in the other end position;

the larger end of the exhaust chamber (3) in the second direction (Y) may form an exhaust end.

6. Battery device according to any one of claims 1-5, characterized in that a plurality of said batteries (1) are distributed along said first direction (X) and said second direction (Y);

orthographic projections of the pressure relief structures (11) of the plurality of batteries (1) distributed in the first direction (X) on a projection plane are positioned in orthographic projections of the same exhaust cavity (3) on the projection plane, and the projection plane is perpendicular to the distribution directions of the upper plate (21) and the lower plate (22).

7. The battery device according to any one of claims 1-5, characterized in that the upper plate (21) comprises weaknesses, which are arranged in a one-to-one correspondence with the batteries (1), and that the orthographic projection of the pressure relief structure (11) of the battery (1) on a projection plane, which is perpendicular to the direction of distribution of the upper plate (21) and the lower plate (22), and the orthographic projection of the weaknesses corresponding thereto on the projection plane at least partially coincide;

the orthographic projection of the weak part on the projection surface is positioned inside the orthographic projection of the exhaust cavity (3) on the projection surface, and the weak part is used for transmitting high-pressure gas discharged by the battery (1) into the exhaust cavity (3) when the battery (1) is in thermal runaway.

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

an electrical device (4);

a battery box body (5), wherein the battery box body (5) comprises a battery integration area (51) and an electric appliance integration area (52) which are distributed in the first direction (X), the battery (1) is positioned in the battery integration area (51), and the electric device (4) is positioned in the electric appliance integration area (52);

and the blocking part (6) is blocked at one end of the exhaust cavity (3) close to the electric appliance integration area (52).

9. The battery device according to any one of claims 1 to 5, wherein a ratio of a dimension of the exhaust chamber (3) in the intermediate position in the second direction (Y) to a dimension of the exhaust chamber (3) in the second direction (Y) is 1/3 or more and 1/2 or less in the first direction (X).

10. Battery device according to any of claims 1-5, characterized in that the battery (1) is a cylindrical battery.