Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment, the battery pack comprises a box body provided with a containing cavity, a battery monomer group, a plurality of battery monomers arranged in the containing cavity and provided with anti-explosion valves at the bottoms, a supporting piece arranged in the containing cavity and located at the bottom of the battery monomer group, and an avoiding hole formed in the supporting piece; and the projections of the explosion-proof valves of the plurality of single batteries in the vertical direction are positioned in the avoiding holes. Therefore, when the explosion-proof valve bears pressure, a conductive polymer and high-pressure gas sprayed out of the explosion-proof valve can be discharged into the preset channel from the avoiding hole, so that the risk that the conductive polymer and the high-pressure gas are in contact with the inner side wall of the avoiding hole of the supporting piece is reduced, faults such as short circuit of the battery are avoided, the insulativity is high, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of new energy vehicles, in particular to a battery pack and an electric device. BACKGROUND

[0002] In the use process of the battery pack, when the internal heat generation of the battery monomer is too large, the internal gas pressure rises rapidly, and high-temperature gas and particles will be sprayed out from the explosion-proof valve. In the related technology, the battery monomer is supported by a support, and a plurality of small holes corresponding to the explosion-proof valve of the battery monomer are arranged on the support, so that the sprayed conductive polymer is discharged from the small holes. The above structure has the problem that the sprayed conductive polymer is very easy to contact the inner side wall of the small hole of the support, insulation failure occurs, and battery short circuit and ignition failure occurs. In severe cases, it may even cause the battery to explode and cause a safety accident. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present disclosure is to provide a battery pack and an electric device, which can reduce the risk of contact between the conductive polymer and the high-pressure gas and the inner side wall of the avoiding hole of the support, avoid the short circuit failure of the battery pack, and improve the safety of the battery to at least partially solve the problems in the related technology.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a battery pack, comprising: a box body provided with a containing cavity; a battery monomer group arranged in the containing cavity and comprising a plurality of battery monomers each provided with an explosion-proof valve; a support arranged in the containing cavity and located at the bottom of the battery monomer group, the support being provided with an avoiding hole; and the projection of the explosion-proof valve of each of the plurality of battery monomers in the vertical direction is located in the avoiding hole.

[0005] Optionally, the battery monomer group and the avoiding hole are a plurality of and one-to-one corresponding.

[0006] Optionally, the avoiding hole extends along a first direction, and the plurality of battery monomers in the battery monomer group are arranged side by side along the first direction and cover the avoiding hole.

[0007] Optionally, the explosion-proof valve comprises an explosion-proof sheet, and the distance between the projection of the score position of the explosion-proof sheet in the vertical direction and the inner side of the avoiding hole is greater than or equal to 5 mm.

[0008] Optionally, the battery further comprises an exhaust passage arranged at the bottom of the support and in communication with the avoiding hole.

[0009] Optionally, the support member is configured as a cold plate, comprising a liquid inlet, a liquid outlet and a cooling liquid flow channel, the cooling liquid flow channel comprising a liquid inlet main flow channel and a liquid outlet main flow channel oppositely arranged in the first direction, the liquid inlet being in communication with the liquid inlet main flow channel, the liquid outlet being in communication with the liquid outlet main flow channel, the liquid inlet main flow channel and the liquid outlet main flow channel being in communication through a plurality of parallel branch flow channels.

[0010] Optionally, the liquid inlet and the liquid outlet are located at the same end of the cold plate in the second direction, and the liquid inlet and the liquid outlet are spaced apart in the first direction.

[0011] Optionally, the branch flow channel comprises a first branch flow channel, a second branch flow channel and a third branch flow channel, the first branch flow channel and the third branch flow channel being respectively located at opposite ends of the cold plate in the second direction, and the third branch flow channel being arranged between two adjacent relief holes.

[0012] Optionally, the third branch flow channel comprises at least one bending section.

[0013] Optionally, the bending section is S-shaped.

[0014] Optionally, the cross-sectional area of the third branch flow channel is greater than the cross-sectional area of the first branch flow channel and / or the second branch flow channel.

[0015] Optionally, the box body comprises a frame body and a bottom guard plate, the bottom guard plate being provided with a flange fixedly connected with the frame body, the bottom guard plate and the frame body enclosing the accommodation cavity; the bottom guard plate comprises a groove recessed away from the support member, and the bottom surface of the support member and the groove enclose an exhaust passage.

[0016] The second aspect of the present disclosure provides a power-using device comprising the battery pack.

[0017] Through the above technical solution, by arranging the relief hole on the support member in the accommodation cavity of the battery pack box body, the projection of the explosion-proof valve of the corresponding plurality of battery cells in the battery cell group arranged in the accommodation cavity in the vertical direction is in the relief hole. In this way, when the explosion-proof valve is under pressure, the conductive polymer and high-pressure gas sprayed from the explosion-proof valve can be discharged from the relief hole into the pre-set passage, thereby reducing the risk of contact between the conductive polymer and high-pressure gas and the inner side wall of the relief hole of the support member, avoiding battery pack short circuit and other failures, and improving the safety of the battery.

[0018] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, illustrate the present disclosure and, together with the specific embodiments described below, serve to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0020] Figure 1 is a perspective view of a battery pack provided in an exemplary embodiment of the present disclosure;

[0021] Figure 2 is an exploded view of a battery pack provided in an exemplary embodiment of the present disclosure;

[0022] Figure 3 is a perspective view of a cold plate provided in an exemplary embodiment of the present disclosure;

[0023] Figure 4 is a bottom view of a battery pack not including a bottom guard provided in an exemplary embodiment of the present disclosure.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1 - box; 11 - accommodation cavity; 12 - frame; 13 - bottom guard; 14 - groove; 2 - battery cell group; 21 - explosion-proof valve; 22 - battery cell; 3 - support; 31 - avoiding hole; 32 - liquid inlet; 33 - liquid outlet; 34 - cooling liquid flow channel; 341 - main liquid inlet flow channel; 342 - main liquid outlet flow channel; 343 - branch flow channel; 344 - first branch flow channel; 345 - second branch flow channel; 346 - third branch flow channel; 347 - bending section. DETAILED DESCRIPTION

[0026] The specific embodiments of the present disclosure will be described in detail hereinafter with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0027] In the present disclosure, the orientation words such as "upper" and "lower" generally refer to the use state of the battery pack unless otherwise stated. "Inner" and "outer" refer to the outer contour of the battery pack. "First direction" can refer to the X direction in Figure 2 , "second direction" can refer to the Y direction in Figure 2 , and "vertical direction" can refer to the Z direction in Figure 2 . In addition, it should be noted that the terms such as "first" and "second" are used to distinguish one element from another element, and do not have sequential and important meanings. In addition, in the description with reference to the drawings, the same reference signs in different drawings represent the same elements.

[0028] As Figures 1-4As shown, the first aspect of the present disclosure provides a battery pack, comprising: a box 1, a battery monomer group 2 and a support 3, wherein the box 1 is provided with a containing cavity 11, the battery monomer group 2 is arranged in the containing cavity 11, the battery monomer group 2 comprises a plurality of battery monomers 22 provided with explosion-proof valves 21 at the bottom, the support 3 is arranged in the containing cavity 11 and located at the bottom of the battery monomer group 2, and the support 3 is provided with a avoiding hole 31; the projection of the explosion-proof valves 21 of the plurality of battery monomers 22 in the vertical direction is in the avoiding hole 31.

[0029] Through the above technical solution, by arranging the containing cavity 11 in the box 1 of the battery pack, and arranging the support 3 with the avoiding hole 31 in the containing cavity 11, the projection of the explosion-proof valves 21 of the corresponding plurality of battery monomers 22 in the battery monomer group 2 arranged in the containing cavity 11 in the vertical direction is in the avoiding hole 31. In this way, when the explosion-proof valve 21 is under pressure, the conductive polymer and high-pressure gas sprayed out of the explosion-proof valve 21 can be discharged from the avoiding hole 31 to the preset channel, thereby avoiding the contact between the conductive polymer and high-pressure gas and the inner side wall of the avoiding hole 31 of the support, improving the insulation, avoiding the short circuit and other faults of the battery pack, and improving the safety of the battery pack.

[0030] It can be understood that the box 1 of the battery pack described above comprises a frame 12 and a bottom guard plate 13, both of which can be rectangular. The frame 12 extends upward along the vertical direction, and the edge of the bottom guard plate 13 is provided with a flange, which is fixedly connected with the bottom of the frame 12. For example, the bottom guard plate 13 and the frame 12 can be fixedly connected by fastening screws. Of course, the fixed connection here is a fixed and sealed connection, so that the bottom guard plate 13 and the inner side wall of the frame 12 form the containing cavity 11. Of course, the flange and the frame 12 can also be fixedly and sealingly connected by welding or gluing. The support 3 described above can be constructed as a cold plate, so as to support the battery monomers 22 and support the battery monomers 22, and the integration of the battery pack is high. The following supports 3 are all described by taking the cold plate as an example.

[0031] In order to facilitate the installation of the cold plate, in some implementable manners, the cold plate can be rectangular, and the bottom guard plate 13 is provided with a mounting position for fixedly connecting with the outer edge of the cold plate. The mounting position can be arranged as an annular stepped surface. The cold plate is placed in the containing cavity 11 and fixedly connected with the mounting position of the bottom guard plate 13, for example, the cold plate can be fixedly connected with the mounting position of the bottom guard plate 13 by structural adhesive.

[0032] The battery cell group 2 includes a plurality of battery cells 22 arranged side by side and can be fixed at a preset position of the cold plate by structural glue, so that the projection of the explosion-proof valve 21 on the battery cell 22 in the vertical direction is in the avoidance hole 31. Thus, the conductive polymer and high-pressure gas sprayed from the explosion-proof valve 21 can be discharged from the avoidance hole 31 into the preset channel, thereby reducing the risk of contact between the conductive polymer and high-pressure gas and the inner side wall of the avoidance hole 31 on the cold plate, and improving the insulation.

[0033] Of course, in some implementable manners, in order to reduce weight, the frame body 12 can be composed of four hollow beams welded end to end.

[0034] In order to facilitate the accommodation of the high-pressure gas and conductive polymer sprayed from the explosion-proof valve 21, the battery pack further includes an exhaust channel provided at the lower part of the cold plate and in communication with the avoidance hole 31. In this way, by providing the exhaust channel, when the explosion-proof valve 21 is opened under pressure, the conductive polymer and high-pressure gas sprayed from the explosion-proof valve 21 can be discharged from the avoidance hole 31 into the exhaust channel, thereby reducing the probability of contact between the conductive polymer and high-pressure gas and the inner side wall of the avoidance hole 31 of the cold plate, and improving the insulation.

[0035] In some implementable manners, the bottom guard plate 13 can include a recess 14 recessed towards the direction away from the cold plate, and the cold plate is fixed at the opening of the recess 14 and is sealingly and fixedly connected with the bottom guard plate 13, so that the bottom surface of the cold plate and the recess 14 together form an exhaust channel, so as to facilitate the conductive polymer and high-pressure gas sprayed from the explosion-proof valve 21 on the corresponding battery cell 22 to pass through the avoidance hole 31 and be discharged through the exhaust channel. The exhaust port of the exhaust channel can be adaptively arranged according to the specific structure of the battery pack, for example, the exhaust port of the exhaust channel can be arranged at any one end of the battery pack in the first direction.

[0036] Of course, it can be understood that the structure of the recess formed on the bottom guard plate 13 and the bottom surface of the cold plate together forming the exhaust channel is illustrative, and in other embodiments, the exhaust channel can be an independent pipeline arranged on the bottom guard plate 13 and in communication with the avoidance hole 31.

[0037] In some implementable manners, the battery cell group 2 and the avoidance hole 31 are a plurality of and one-to-one corresponding, such as Figure 2As shown, the number of battery cell groups 2 can be three, and the corresponding avoiding holes 31 on the cold plate are also three. The avoiding holes 31 extend along the first direction, and the plurality of battery cells 22 in the battery cell group 2 are also correspondingly arranged side by side along the first direction and cover the corresponding avoiding holes 31. The battery cells 22 extend along the second direction, and the two ends of the battery cells are fixedly connected to the cold plate through structural glue. The projection of the explosion-proof valve 21 of the battery cell 22 in the vertical direction is in the avoiding hole 31. The plurality of battery cells 22 are arranged side by side along the first direction and cover the corresponding avoiding holes 31, so that the battery cell group 2 and the edge of the avoiding hole 31 form a seal, so that when the explosion-proof valve 21 of each battery cell 22 is opened, the conductive polymer and high-pressure gas can only be discharged from the exhaust passage, thereby reducing the contact between the conductive polymer and high-pressure gas and the inner side wall of the avoiding hole 31 of the cold plate, causing short-circuiting and other faults of the battery pack, and improving the safety of the battery pack. In addition, it can be understood that the explosion-proof valve 21 can be located in the middle of the battery cell 22, and can be adjusted according to the specific working condition, for example, the explosion-proof valve 21 can be located at the side of the battery cell 22.

[0038] Of course, in another implementation manner, the number of battery cell groups 2 is three, and the three battery cell groups 2 are arranged side by side along the second direction. Among them, the bottom of the battery cell 22 in the battery cell group 2 located in the middle has an explosion-proof valve 21, and the battery cells 22 in the remaining two battery cell groups 2 can be provided with explosion-proof valves 21 on the outer side in the second direction. At this time, the avoiding hole 31 on the cold plate is one, which is arranged in the middle of the cold plate and cooperates with the battery cell group 2 in the middle. The frame body 12 can be provided with a lateral exhaust passage, which can be separately provided or communicated. The lateral exhaust passage cooperates with the battery cells 22 in the remaining two battery cell groups 2 to enable the conductive mixture and high-pressure gas sprayed by the explosion-proof valve 21 located on the outer side to be discharged along the lateral exhaust passage.

[0039] Of course, the number of battery cell groups 2 and avoiding holes 31 can be selectively set according to the specific model of the battery pack, and the number is not limited in the disclosure.

[0040] In addition, the number of battery cells 22 in the battery cell group 2 can partially cover the avoiding hole 31 in the first direction, that is, the plurality of battery cells 22 in the battery cell group 2 can form a gap between the first direction and the avoiding hole 31. When the size of the gap is small, only a small amount of high-pressure gas sprayed by the explosion-proof valve 21 of the battery cell 22 will flow into the box 1, and will not cause short-circuiting and other faults of the battery pack. Of course, when the size of the gap is large, the shielding plate can be covered and fixedly connected to the cold plate by structural glue to prevent too much high-pressure gas from entering the box 1 and to avoid causing short-circuiting of the battery pack.

[0041] In some implementable manners, the explosion-proof valve 21 comprises an explosion-proof sheet, the explosion-proof sheet is arranged in the explosion-proof valve, the explosion-proof sheet is provided with a notch, the notch position is a weak position of the explosion-proof sheet, when the internal pressure of the battery reaches a preset value, the explosion-proof sheet will break at the notch position to release pressure, the projection of the notch position of the explosion-proof sheet in the vertical direction is greater than or equal to 5mm from the inner side of the avoiding hole 31, so as to limit the distance between the projection of the notch position of the explosion-proof sheet in the vertical direction and the inner side of the avoiding hole 31, that is, limit the distance between the projection of the explosion-proof sheet in the vertical direction and the inner side of the avoiding hole 31 in the first direction and the inner side in the second direction to be greater than or equal to 5mm, so that there is enough space between the high-pressure gas and the conductive polymer sprayed by the explosion-proof valve 21 and the avoiding hole 31 on the cold plate, reducing the probability of contact between the high-pressure gas and the conductive polymer sprayed by the explosion-proof valve 21 and the inner side wall of the cold plate, improving the insulation and the safety of the battery pack.

[0042] In some implementable manners, in order to control the overall temperature of the battery pack, the cold plate comprises a liquid inlet 32, a liquid outlet 33 and a cooling liquid flow channel 34, the cooling liquid flow channel 34 comprises a liquid inlet main flow channel 341 and a liquid outlet main flow channel 342 arranged opposite in the first direction, the liquid inlet 32 is in communication with the liquid inlet main flow channel 341, the liquid outlet 33 is in communication with the liquid outlet main flow channel 342, and the liquid inlet main flow channel 341 and the liquid outlet main flow channel 342 are communicated by a plurality of parallel branch flow channels 343. When the battery pack is charging and discharging, the temperature of the battery monomer 22 in the battery monomer group 2 will rise, the cooling liquid enters the cooling liquid flow channel 34 through the liquid inlet 32, the cooling liquid first passes through the liquid inlet main flow channel 341 and synchronously passes through a plurality of parallel branch flow channels 343 to flow into the liquid outlet main flow channel 342 and flow out through the liquid outlet 33, so that the cooling liquid forms a one-sided inlet and outlet mode to exchange heat with the plurality of battery monomers 22 on the cold plate, so as to control the temperature of the plurality of battery monomers 22 within a preset range, reduce the risk of thermal runaway of the battery pack, and improve the safety of the battery pack.

[0043] In some implementable manners, the liquid inlet 32 and the liquid outlet 33 are located at the same end of the cold plate in the second direction, and the liquid inlet 32 and the liquid outlet 33 are arranged at intervals in the first direction, so that the cooling liquid forms a one-sided inlet and outlet mode, so that the cooling liquid can have enough flow time to exchange heat with the battery monomer 22, so that the overall temperature of the battery pack is more uniform, reducing the risk of thermal runaway of the battery pack, and improving the safety of the battery pack.

[0044] In some implementable manners, as Figure 3 and Figure 4As shown, the branch flow channel 343 can include a first branch flow channel 344, a second branch flow channel 345, and a third branch flow channel 346, the first branch flow channel 344 and the second branch flow channel 345 are respectively located at opposite ends of the cold plate in the second direction, and the third branch flow channel 346 is arranged between the adjacent two avoiding holes 31. For example, the number of the first branch flow channel 344 and the second branch flow channel 345 is two, and the two first branch flow channels 344 and the two second branch flow channels 345 are arranged in parallel between the liquid inlet main flow channel 341 and the liquid outlet main flow channel 342, and the number of the third branch flow channel 346 can be two, and the two third branch flow channels 346 are respectively arranged between the adjacent two avoiding holes 31, so that the cooling liquid enters the cooling liquid flow channel 34 through the liquid inlet 32, that is, the cooling liquid first flows through the liquid inlet main flow channel 341 and synchronously flows into the liquid outlet main flow channel 342 through the first branch flow channel 343, the second branch flow channel 345, and the third branch flow channel 346, and then flows out through the liquid outlet 33, so that the cooling liquid can exchange heat with the battery monomers 22 arranged on the cold plate, so that the temperature of the plurality of battery monomers 22 is within the preset temperature range, thereby reducing the risk of thermal runaway of the battery pack and improving the safety of the battery pack.

[0045] As shown in Figures 1-4 The number of the battery monomer groups 2 is three, and the three battery monomer groups 2 are arranged side by side along the second direction, and the electrodes in the adjacent two battery monomer groups 2 are located between the adjacent two avoiding holes 31. In order to make the temperature of the battery monomers 22 consistent, the third branch flow channel 346 includes at least one bending section 347. Specifically, the number of the bending section 347 of one third branch flow channel 346 is one, and the bending section 347 can be S-shaped, so that by arranging the S-shaped bending section 347, the contact time of the cooling liquid with the battery monomers 22 can be prolonged, so that the cooling liquid can fully exchange heat with the corresponding battery monomers 22, so that the temperature of the plurality of battery monomers 22 is consistent, thereby reducing the risk of thermal runaway of the battery pack.

[0046] In some implementable manners, in order to further exchange heat between the battery monomers 22 between the adjacent two avoiding holes 31, the cross-sectional area of the third branch flow channel 346 is greater than that of the first branch flow channel 344 and / or the second branch flow channel 345, so that the flow of the cooling liquid flowing into the third branch flow channel 346 can be increased, so that the cooling liquid can fully exchange heat with the battery monomers 22 in this part, so that the temperature of the plurality of battery monomers 22 is consistent, thereby reducing the risk of thermal runaway of the battery pack.

[0047] It can be understood that the above-mentioned bending section 347 is S-shaped, which is illustrative. In other embodiments, the bending section 347 can also be zigzag-shaped or wave-shaped.

[0048] In addition, in order to facilitate heat exchange with the plurality of battery cells 22 located at both ends of the cold plate in the first direction, the first branch flow channel 344 and the second branch flow channel 345 can each be a straight section.

[0049] The second aspect of the present disclosure provides a power consuming device comprising the battery pack described above. It can be understood that the power consuming device described above can be a vehicle, a portable device, a ship, a spacecraft, and a power tool, etc. Specifically, the spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc.; the power tool includes a metal cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, for example, a power drill, a power grinder, a power hammer, a percussion power drill, a concrete vibrator, and a power planer, etc. The embodiments of the present application do not make special restrictions on the power consuming device described above.

[0050] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0051] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0052] In addition, various different embodiments of the present disclosure can also be combined in any manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body provided with a receiving cavity, a battery cell group provided in the receiving cavity and comprising a plurality of battery cells each provided with an explosion-proof valve, a support provided in the receiving cavity and located at the bottom of the battery cell group, the support being provided with an avoiding hole; the explosion-proof valves of the plurality of battery cells are projected in the vertical direction into the avoiding hole.

2. The battery pack of claim 1, wherein, The battery cell group and the avoiding hole are in one-to-one correspondence.

3. The battery pack of claim 1, wherein, The avoiding hole extends along a first direction, and the plurality of battery cells in the battery cell group are arranged side by side along the first direction and cover the avoiding hole.

4. The battery pack of claim 1, wherein, The explosion-proof valve comprises an explosion-proof sheet, and the distance between the projection of the score position of the explosion-proof sheet in the vertical direction and the inner side of the avoiding hole is greater than or equal to 5 mm.

5. The battery pack of claim 1, wherein, The battery further comprises an exhaust passage provided at the lower part of the support and in communication with the avoiding hole.

6. The battery pack of any one of claims 1-5, wherein, The support is configured as a cold plate comprising a liquid inlet, a liquid outlet and a cooling liquid flow channel, the cooling liquid flow channel comprising a liquid inlet main flow channel and a liquid outlet main flow channel oppositely arranged in the first direction, the liquid inlet being in communication with the liquid inlet main flow channel, the liquid outlet being in communication with the liquid outlet main flow channel, and the liquid inlet main flow channel and the liquid outlet main flow channel being in communication through a plurality of parallel branch flow channels.

7. The battery pack of claim 6, wherein, The liquid inlet and the liquid outlet are located at the same end of the cold plate in the second direction, and the liquid inlet and the liquid outlet are arranged at intervals in the first direction.

8. The battery pack of claim 6, wherein, The branch flow channel comprises a first branch flow channel, a second branch flow channel and a third branch flow channel, the first branch flow channel being located at opposite ends of the cold plate in the second direction, and the third branch flow channel being provided between adjacent avoiding holes.

9. The battery pack of claim 8, wherein, The third branch flow channel comprises at least one bending section.

10. The battery pack of claim 9, wherein, The bending section is S-shaped.

11. The battery pack of claim 8, wherein, The cross-sectional area of the third branch flow channel is greater than that of the first branch flow channel and / or the second branch flow channel.

12. The battery pack of any one of claims 1-5 or 7-11, wherein, The box body comprises a frame body and a bottom guard plate, the bottom guard plate being provided with a flange fixedly connected with the frame body, and the bottom guard plate and the frame body enclosing the receiving cavity; The bottom guard plate comprises a groove recessed towards the direction away from the support, and the bottom surface of the support and the groove enclosing the exhaust passage.

13. An electrical device, characterized by The battery pack comprises any one of claims 1-12.

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