Box body and battery pack

Abstract

The utility model provides a box body and a battery pack. The box body comprises a lower box body and a box cover, the lower box body comprises a box bottom and a box wall, a flange surrounding the outer side surface of the box wall is arranged at the end, away from the box bottom, of the box wall, and convex ribs are arranged on the upper surface of the flange and surround the box wall; the box cover covers the lower box body, an exhaust channel is arranged between the box cover and the convex rib, and the lower surface of the box cover and the box wall are arranged at intervals. When the box cover and the lower box body are sealed through polystyrene foam, the polystyrene foam can flow along the gap between the lower surface of the box cover and the box wall and fill the exhaust channel, the polystyrene foam can be extruded through the convex ribs, filling of the polystyrene foam is tighter, and therefore the problems that when the polystyrene foam is filled, cavitation is prone to occurring, water vapor permeation is caused and the like are solved. And the sealing reliability of the battery pack in the whole life cycle is influenced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a box body and a battery pack. BACKGROUND

[0002] The battery pack comprises a box body and a battery cell arranged in the box body, the box body comprises an upper cover and a lower box body, and the upper cover is covered on the lower box body. In order to ensure the sealing effect of the box body, a sealing material needs to be arranged between the upper cover and the lower box body.

[0003] In the related art, the sealing of the upper cover and the lower box body is usually performed by using preformed silica gel foam or foaming glue. The material cost and process cost of the preformed silica gel foam are relatively high. Although the use of foaming glue can reduce the cost, an exhaust hole needs to be arranged on the upper cover, the surface area of the upper cover is large, and air bubbles are prone to occur during the filling of the foaming glue, which may cause water vapor penetration and affect the sealing reliability of the battery pack in the whole life cycle.

[0004] Therefore, it is urgent to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0005] Embodiments of the present application provide a box body and a battery pack, which can solve the technical problem that the use of foaming glue for sealing requires an exhaust hole to be arranged on the upper cover, air bubbles are prone to occur during the filling of the foaming glue, which may cause water vapor penetration and affect the sealing reliability of the battery pack in the whole life cycle.

[0006] In a first aspect, embodiments of the present application provide a box body, which comprises:

[0007] A lower box body comprising a box bottom and a box wall arranged at the periphery of the box bottom, an end of the box wall away from the box bottom is provided with a flange, the flange is arranged around the outer surface of the box wall, and a side surface of the flange away from the box bottom is provided with a convex rib, and the convex rib is arranged around the box wall.

[0008] An upper cover which is covered with the lower box body, an exhaust passage is arranged between the upper cover and the convex rib, and a lower surface of the upper cover is spaced apart from the box wall.

[0009] In some embodiments, the convex rib surrounds the box wall for one turn, and the lower surface of the upper cover is spaced apart from the upper surface of the convex rib to form the exhaust passage.

[0010] In some embodiments, the distance between the lower surface of the upper cover and the upper surface of the convex rib is a first distance.

[0011] The distance between the lower surface of the upper cover and a side surface of the box wall close to the upper cover is a second distance, and the first distance is smaller than the second distance.

[0012] In some embodiments, a lower surface of the box cover is in contact with an upper surface of the convex rib, and the convex rib is provided with an opening to form the exhaust passage.

[0013] In some embodiments, the convex rib comprises a plurality of segments spaced apart, and the exhaust passage is arranged between two adjacent segments.

[0014] In some embodiments, a boss is arranged on a side surface of the box wall close to the box cover, the boss is arranged on a side of the convex rib close to the center of the box body, and the boss is spaced apart from the convex rib.

[0015] In some embodiments, the boss has a thickness smaller than that of the box wall, and a groove is arranged on a side surface of the flange close to the box cover, the groove being located between the convex rib and the boss.

[0016] In some embodiments, the boss has a thickness farther away from the box bottom smaller than that of the boss close to the box bottom.

[0017] In some embodiments, the box cover comprises a main body portion, an edge portion, and a transition portion connecting the main body portion and the edge portion, the edge portion corresponding to the convex rib, and the main body portion corresponding to an area enclosed by the box wall;

[0018] In some embodiments, a distance between an end of the transition portion close to the main body portion and an upper surface of the box bottom is greater than a distance between an end of the transition portion close to the edge portion and the upper surface of the box bottom.

[0019] In a second aspect, embodiments of the present application provide a battery pack, comprising a sealing member, a battery cell, and the box body described above, the battery cell being arranged in the box body, and the sealing member being arranged at least between the battery cell and the box cover and filling the exhaust passage.

[0020] The embodiments of the present application have the following beneficial effects:

[0021] In the embodiments of the present application, a flange is arranged on an outer side surface of the box wall, a convex rib is arranged on a side of the flange close to the box cover, and an exhaust passage is arranged between the convex rib and the box cover. When foaming glue is used to seal the box cover and the lower box body, the foaming glue can flow along the gap between the lower surface of the box cover and the box wall and fill the exhaust passage. The arrangement of the convex rib can cause the foaming glue to be extruded, so that the foaming glue is filled more tightly, thereby improving the technical problem that air bubbles are prone to occur when the foaming glue is filled, water vapor permeation occurs, and the sealing reliability of the battery pack in the whole life cycle is affected. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0023] Figure 1 is a principle diagram of filling the box with foaming glue;

[0024] Figure 2 is a three-dimensional schematic diagram of the box provided by the embodiments of the present application;

[0025] Figure 3 is an exploded view of the box in Figure 2 ;

[0026] Figure 4 is a top view structural schematic diagram of the box in Figure 2 ;

[0027] Figure 5 is a sectional view of C-C in Figure 4 ;

[0028] Figure 6A is a partial enlarged structural schematic diagram of A in Figure 5 ;

[0029] Figure 6B is a structural schematic diagram of the box after filling and sealing in Figure 6A ;

[0030] Figure 6C is another partial enlarged structural schematic diagram of A in Figure 5 ;

[0031] Figure 7A is a state before filling and sealing in the lower box;

[0032] Figure 7B is a state after filling and sealing in the lower box;

[0033] Figure 8 is a sectional structural schematic diagram of the battery pack provided by the embodiments of the present application.

[0034] Explanation of reference signs:

[0035] Box 100, foaming glue 200;

[0036] Box 1;

[0037] Lower box 10, box bottom 11, box wall 12, boss 121, flange 13, groove 13a, convex rib 131, opening 131a, segmented part 1311;

[0038] Box lid 20, main body 21, edge 22, transition 23;

[0039] First spacing h1, second spacing h2, thickness s1 of boss 121, thickness s2 of box wall 12;

[0040] Battery pack 2;

[0041] 3. Sealing component; 4. Battery cell. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0043] like Figure 1 As shown, Figure 1 This is a schematic diagram illustrating the principle of the expanding foam 200 filling box 100. When expanding foam 200 is filled into box 100, its volume expands, eventually filling the entire space inside the box. During this expansion process, the expanding foam 200 expels air from the box. Before the expanding foam 200 fully expands, the top cover (not shown in the diagram) can be placed on box 100, allowing the expanding foam 200 to bond and seal the top cover to box 100.

[0044] Compared to related technologies that use pre-formed silicone foam to achieve a seal between the lid and the box 100, the material and processing costs of expanded silicone foam are lower, thus reducing product production costs. However, as... Figure 1 As shown, when the top cover is closed, the expanding foam 200 is compressed by the top cover, and the gas inside the box will be discharged from the vent hole of the top cover and the gap between the top cover and the box 100. Therefore, it cannot be guaranteed that the expanding foam 200 is completely filled, that is, there may be air bubbles in the expanding foam 200. During long-term use, moisture in the air can easily enter the air bubbles and then penetrate into the box 100, causing the seal to fail.

[0045] Regarding the aforementioned technical issues, firstly, such as Figures 2 to 7BAs shown, the embodiment of the present application provides a box 1, which comprises a lower box 10 and a box cover 20. The lower box 10 comprises a box bottom 11 and a box wall 12 arranged at the periphery of the box bottom 11. The box wall 12 is provided with a flange 13 at the end away from the box bottom 11. The flange 13 is arranged around the outer side surface of the box wall 12. The flange 13 is provided with a protruding rib 131 at the side surface away from the box bottom 11. The protruding rib 131 is arranged around the box wall 12. The box cover 20 is combined with the lower box 10. The exhaust passage is arranged between the box cover 20 and the protruding rib 131. The lower surface of the box cover 20 is arranged in a spaced manner with the box wall 12.

[0046] As shown in Figures 2 to 5 , the lower box 10 comprises a box bottom 11 and a box wall 12 arranged at the periphery of the box bottom 11. The box bottom 11 and the box wall 12 form a box-shaped structure. The box bottom 11 and the box wall 12 form a containing space, which can be used to contain objects, such as the battery cell 4, etc. The end of the box wall 12 away from the box bottom 11 is open. The box cover 20 is combined with the open end.

[0047] As shown in Figure 3 , Figure 5 , Figure 6A , the box wall 12 is provided with a flange 13 at the end away from the box bottom 11. The flange 13 is arranged around the outer side surface of the box wall 12. The outer side surface of the box wall 12 refers to the side surface of the box wall 12 away from the center of the box 1. The flange 13 extends in the direction away from the outer side surface of the box wall 12.

[0048] It should be noted that the flange 13 can continuously surround the box wall 12 for one turn, or the flange 13 can be discontinuous and multiple parts. The present application does not limit this. Figure 3 The case where the flange 13 continuously surrounds the box wall 12 for one turn is shown in

[0049] As shown in Figure 3 , the flange 13 is provided with a protruding rib 131 at the side surface away from the box bottom 11, i.e. the side surface of the flange 13 facing the box cover 20 is provided with a protruding rib 131. When the flange 13 continuously surrounds the box wall 12 for one turn, the protruding rib 131 can also continuously surround the box wall 12 for one turn or be discontinuously arranged. Figure 3 The case where the protruding rib 131 is discontinuously arranged is shown in

[0050] As shown in Figure 3 , Figure 5 and Figure 6B , the box cover 20 is not provided with an exhaust hole. After the box cover 20 is combined with the lower box 10, the sealing member 3 expands and flows along the exhaust passage between the box cover 20 and the lower box 10. The sealing member 3 can be a material with foaming ability, such as foaming glue, etc.

[0051] In some embodiments, the lower surface of the cover 20 is spaced apart from the tank wall 12, and the seal 3 flows along the gap between the lower surface of the cover 20 and the tank wall 12 in a direction away from the center of the tank 1, is blocked by the protrusion 131, so as to avoid that the seal 3 blocks the exhaust passage too early; at the same time, the protrusion 131 applies pressure to the seal 3, so that the seal 3 is filled tightly, the seal 3 further flows, and continues to fill the exhaust passage between the cover 20 and the protrusion 131, until the exhaust passage is completely blocked, so as to realize the bonding and sealing of the cover 20 and the lower tank 10.

[0052] Please refer to Figure 6A and Figure 7A , which show the state of the seal 3 not filled from different perspectives; please refer to Figure 6B and Figure 7B , which show the state of the seal 3 filled from different perspectives. Figure 7A and Figure 7B omit the cover 20, so as to facilitate the illustration of the distribution state of the seal 3 in the lower tank 10.

[0053] It should be noted that the exhaust passage can be the gap between the upper surface of the protrusion 131 and the lower surface of the cover 20, or the exhaust passage can be an exhaust hole provided on the protrusion 131, which penetrates the protrusion 131 in the thickness direction of the tank wall 12.

[0054] The size of the exhaust passage can be adjusted according to the expansion speed of the seal 3, so as to avoid that the exhaust passage is too large, and the seal 3 is not easy to fill the exhaust passage; and avoid that the exhaust passage is too small, and the air in the tank 1 is not easy to exhaust.

[0055] The materials of the lower tank 10 and the cover 20 can be set as needed, for example, the materials of the lower tank 10 and the cover 20 can be metal, plastic, etc., but are not limited thereto.

[0056] In some embodiments, as shown in Figure 3 and Figure 6C , the protrusion 131 surrounds the tank wall 12, and the lower surface of the cover 20 is spaced apart from the upper surface of the protrusion 131 to form the exhaust passage.

[0057] The protrusion 131 can be continuously arranged around the tank wall 12, and the protrusion 131 can not be provided with an exhaust hole, but the upper surface of the protrusion 131 and the lower surface of the cover 20 are spaced apart to form the exhaust passage. The exhaust passage can be used for exhausting the air in the tank 1, and the seal 3 can flow along the exhaust passage between the lower surface of the cover 20 and the upper surface of the protrusion 131, and fill the exhaust passage.

[0058] In some embodiments, as shown in Figure 3 and Figure 6CAs shown, the distance between the lower surface of the box cover 20 and the upper surface of the rib 131 is the first distance h1; the distance between the lower surface of the box cover 20 and the side surface of the box wall 12 near the box cover 20 is the second distance h2, and the first distance h1 is smaller than the second distance h2.

[0059] like Figure 6C As shown, in order to make the seal 3 fill more tightly, the first gap h1 can be smaller than the second gap h2. When the seal 3 flows in a direction away from the center of the housing 1, since the first gap h1 is smaller than the second gap h2, the space for the seal 3 to flow is reduced, and the pressure on the seal 3 increases. Therefore, the seal 3 can be further compressed, reducing the risk of cavitation in the seal 3 and improving the sealing reliability.

[0060] In some embodiments, such as Figure 3 and Figure 6A As shown, the lower surface of the box cover 20 contacts the upper surface of the rib 131, and the rib 131 is provided with an opening 131a to form an exhaust channel.

[0061] like Figure 6A As shown, the lower surface of the lid 20 contacts the upper surface of the rib 131. During the closing process, the lid 20 can be pressed down until it abuts against the rib 131. Once the lid 20 abuts against the rib 131, it cannot be pressed down further, thus facilitating the determination of whether the lid 20 is properly closed. This design improves the alignment accuracy of the lid 20 and the lower housing 10, reducing the impact on sealing performance caused by incomplete closing of the lid 20 and the lower housing 10.

[0062] like Figure 3 As shown, the rib 131 has an opening 131a to form an exhaust channel. The opening 131a can be a through hole that extends through the rib 131 along the thickness direction of the box wall 12, or the opening 131a can be formed due to the intermittent arrangement of the rib 131.

[0063] In some embodiments, such as Figure 3 As shown, the rib 131 includes multiple segments 1311 spaced apart, and an exhaust channel is provided between two adjacent segments 1311.

[0064] like Figure 3 and Figure 7A As shown, the segments 1311 are distributed along the periphery of the box wall 12. The distance between the side surface of the segment 1311 closest to the box wall 12 and the inner surface of the box wall 12 can be consistent, so that the flow distance of the seal 3 is the same in all directions when it flows, and the seal 3 can fill evenly in all directions.

[0065] In some embodiments, such as Figure 3 , Figure 5 , Figure 6AAs shown, a boss 121 is provided on the side surface of the box wall 12 near the box cover 20. The boss 121 is located on the side of the rib 131 near the center of the box body 1, and the boss 121 and the rib 131 are spaced apart.

[0066] like Figure 6A As shown, the boss 121 is provided on the side surface of the box wall 12 near the box cover 20. The boss 121 can be provided around the upper surface of the box wall 12, or the boss 121 can be provided at intervals along the upper surface of the box wall 12. Figure 3 The diagram shows the boss 121 arranged around the upper surface of the box wall 12.

[0067] Since the boss 121 and the rib 131 are spaced apart, a receiving space is formed between the boss 121 and the rib 131. The receiving space can be used to accommodate the sealing element 3. Through the above arrangement, a sealing ring can be formed around the opening of the lower housing 10, thereby improving the sealing reliability.

[0068] In some embodiments, such as Figure 6A As shown, the thickness s1 of the boss 121 is less than the thickness s2 of the box wall 12. The flange 13 has a groove 13a on the side surface facing the box cover 20. The groove 13a is located between the rib 131 and the boss 121.

[0069] Optionally, the thickness s1 of the boss 121 is less than the thickness s2 of the housing wall 12, thereby increasing the space for accommodating the seal 3 and increasing the thickness of the sealing ring. Thickness refers to the dimension in the direction perpendicular to the outer surface of the housing wall 12.

[0070] In other embodiments, the thickness s1 of the boss 121 may be equal to the thickness s2 of the box wall 12.

[0071] Optionally, such as Figure 6A As shown, a groove 13a is provided on the side surface of the flange 13 facing the cover 20, and the groove 13a is located between the rib 131 and the boss 121. That is to say, the upper surface of the flange 13 has different horizontal heights, wherein the horizontal height of the upper surface of the flange 13 located between the rib 131 and the boss 121 is lower than the horizontal height of the upper surface of the flange 13 located on the side of the rib 131 away from the cover wall 12.

[0072] By setting the groove 13a, the upper surface of the flange 13 is recessed towards the center side of the flange 13, leaving more space to accommodate the seal 3, increasing the size of the seal 3 in the direction perpendicular to the upper surface of the flange 13, and at the same time, increasing the bonding area between the seal 3 and the lower housing 10, thereby improving the sealing effect.

[0073] In some embodiments, such as Figure 3 and Figure 6AAs shown, the thickness of the boss 121 away from the bottom 11 is less than the thickness of the boss 121 near the bottom 11. This means that the boss 121 has an uneven thickness, specifically, the thickness of the end of the boss 121 near the cover 20 is less than the thickness of the end of the boss 121 near the bottom 11. This arrangement increases the accommodating space between the boss 121 and the rib 131, increases the volume of the accommodating sealing element 3, and improves the sealing effect.

[0074] Optionally, such as Figure 6A As shown, at least one sidewall of the boss 121 is inclined, that is, the sidewall of the boss 121 forms an acute angle with the bottom surface of the boss 121. By setting the sidewall of the boss 121 as inclined, it is beneficial for the seal 3 to flow in a direction away from the center of the housing 1.

[0075] Furthermore, the thickness of the boss 121 gradually decreases in the direction away from the bottom 11. This makes the sidewalls of the boss 121 smoother, which is beneficial for the flow of the seal 3.

[0076] Furthermore, an arc surface can be provided between the upper surface of the boss 121 and the side wall of the boss 121, thereby further reducing the resistance of the boss 121 to the seal 3 and making it more conducive to the flow of the seal 3.

[0077] Optionally, such as Figure 6A As shown, the height of the boss 121 is greater than the height of the rib 131. The height of the boss 121 refers to its dimension in the direction perpendicular to the upper surface of the flange 13, and the height of the rib 131 refers to its dimension in the direction perpendicular to the upper surface of the flange 13. This arrangement increases the bonding area between the seal 3 and the boss 121, thus improving sealing performance.

[0078] In some embodiments, such as Figure 4 and Figure 6A As shown, the box cover 20 includes a main body 21, an edge 22, and a transition 23 connecting the main body 21 and the edge 22. The edge 22 corresponds to the rib 131, and the area enclosed by the main body 21 and the box wall 12 corresponds to the area enclosed by the box wall 12. The distance between the end of the transition 23 near the main body 21 and the upper surface of the box bottom 11 is greater than the distance between the end of the transition 23 near the edge 22 and the upper surface of the box bottom 11.

[0079] like Figure 6A As shown, the main body 21, edge 22, and transition 23 may have a substantially uniform thickness. The lower surfaces of the main body 21, edge 22, and transition 23 are not located on the same horizontal plane.

[0080] In some embodiments, such as Figure 6AAs shown, the edge portion 22 abuts against the rib 131. The transition portion 23 is provided at least corresponding to the region between the rib 131 and the boss 121.

[0081] The distance between the end of the transition portion 23 close to the main body portion 21 and the upper surface of the box bottom 11 is greater than the distance between the end of the transition portion 23 close to the edge portion 22 and the upper surface of the box bottom 11. That is, the lower surface of the transition portion 23 is inclined, the lower surface of the transition portion 23 forms an obtuse angle with the lower surface of the main body portion 21, and the lower surface of the transition portion 23 forms an obtuse angle with the lower surface of the edge portion 22. Since the lower surface of the transition portion 23 is inclined, the air discharge and the flow of the sealing member 3 are facilitated. Meanwhile, the lower surface of the transition portion 23 is inclined, which can increase the bonding area between the transition portion 23 and the sealing member 3, and improve the sealing performance.

[0082] In a second aspect, the embodiments of the present application provide a battery pack 2, which comprises the sealing member 3, the battery cell 4, and the box 1 described above, the battery cell 4 is arranged in the box 1, the sealing member 3 is arranged at least between the battery cell 4 and the box cover 20, and the sealing member 3 fills the exhaust passage. Figure 8

[0083] The sealing member 3 is a material with foaming capability, which can expand to fill the space in the box 1, and achieve the sealing effect. The sealing member 3 can be selected from materials with mechanical protection, thermal protection, insulation protection, and the like, to further improve the sealing effect.

[0084] As shown, the battery cell 4 is arranged in the box 1, and the box bottom 11 can bear the battery cell 4. The sealing member 3 is filled between the battery cell 4 and the box cover 20, the sealing member 3 expands to discharge the air in the box 1, and the sealing of the box 1 is achieved. Figure 8

[0085] In some embodiments, the sealing member 3 covers part of the surface of the side of the rib 131 away from the center of the box 1. When the sealing member 3 flows from the exhaust passage to the outside of the box 1, the sealing member 3 can at least partially overflow to the outer surface of the rib 131. Through the above arrangement, on the one hand, the filling of the sealing member 3 can be guaranteed, and on the other hand, the filling state of the sealing member 3 can be judged by observing whether the sealing member 3 overflows.

[0086] The embodiments of the present application are described in detail above, and specific examples are applied in this paper to describe the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation modes and application ranges will be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.​​

Claims

1. A box (1) characterized in that, The utility model relates to a box, and particularly relates to a box with exhaust channel. The utility model discloses a box, which comprises a lower box body (10) and a cover (20). The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel.

2. A box (1) according to claim 1, characterized in that The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel.

3. A box (1) according to claim 2, characterized in that The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel.

4. A box (1) according to claim 1, characterized in that The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel.

5. A box (1) according to claim 4, characterized in that The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel.

6. A box (1) according to any one of claims 1 to 5, characterized in that The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel.

7. A box (1) according to claim 6, characterized in that The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel.

8. A box (1) according to claim 7, characterized in that The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel.

9. A box (1) according to claim 8, characterized in that The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. 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The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover (20) is spaced apart from the upper surface of the flange (13) to form the exhaust channel. The lower surface of the cover 10. A battery pack (2) characterized by, The battery cell (4) is arranged in the box (1), and the sealing member (3) is arranged at least between the battery cell (4) and the box cover (20), and the sealing member (3) fills the exhaust passage.

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