Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and belongs to the technical field of batteries, the battery pack comprises a box body, the box body comprises a bottom plate and a frame, and the frame and the bottom plate define a containing cavity; the composite assembly is arranged in the containing cavity and comprises a first liquid cooling part, a second liquid cooling part and a gas collecting part, a liquid cooling channel is defined by the first liquid cooling part and the second liquid cooling part, a first exhaust channel is defined by the gas collecting part and the second liquid cooling part, and a plurality of first exhaust ports are formed in the first liquid cooling part and the second liquid cooling part in a penetrating mode; the plurality of batteries are arranged in the accommodating cavity, the batteries are connected with the first liquid cooling piece, each battery is provided with a first pressure relief part, the first pressure relief parts are used for communicating with at least one first exhaust port, a second exhaust channel is arranged in the frame, the first exhaust channel communicates with the second exhaust channel, and the frame is provided with a second pressure relief part. High-temperature and high-pressure gas is guided to be directionally and rapidly discharged out of the battery pack when the battery is in thermal runaway, meanwhile, the temperature of the high-temperature and high-pressure gas is reduced through the liquid cooling structure, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery pack and electrical equipment. Background Art

[0002] At present, when a battery in a battery pack experiences thermal runaway, a large amount of high-temperature and high-pressure gas will quickly spray into the battery pack. These high-temperature and high-pressure gases will move around in the battery pack in a disorderly manner. If the high-temperature and high-pressure gases are not promptly guided out of the battery pack along a fixed path that avoids other non-thermal runaway batteries, it will not only easily cause more battery damage, but may also cause more serious safety accidents. Utility Model Content

[0003] Purpose of the utility model: The embodiment of the present application provides a battery pack to solve the above-mentioned technical problems; another purpose of the present application is to provide an electrical device using the above-mentioned battery pack.

[0004] Technical solution: A battery pack described in an embodiment of the present application includes:

[0005] A box body, the box body comprising a bottom plate and a frame connected to each other, the frame surrounds the bottom plate, and the frame and the bottom plate form a receiving cavity;

[0006] A composite component, the composite component is arranged in the accommodating cavity, the composite component includes a first liquid-cooling component, a second liquid-cooling component and an air collecting component which are stacked, the air collecting component is arranged between the second liquid-cooling component and the bottom plate, and the first liquid-cooling component is arranged on a side of the second liquid-cooling component away from the bottom plate, the first liquid-cooling component and the second liquid-cooling component are surrounded by a liquid-cooling channel, and the air collecting component and the second liquid-cooling component are surrounded by a first exhaust channel, the liquid-cooling channel and the first exhaust channel are spaced from each other, and the first liquid-cooling component and the second liquid-cooling component are penetrated by a plurality of first exhaust ports connected to the first exhaust channel;

[0007] A plurality of batteries, wherein the plurality of batteries are arranged in the accommodating cavity, the batteries are located on a side of the first liquid cooling member away from the bottom plate, and the batteries are connected to the first liquid cooling member, and a first pressure relief portion is arranged on a side of the batteries facing the first liquid cooling member;

[0008] Among them, the first pressure relief portion is used to connect at least one of the first exhaust ports, a second exhaust channel is provided in the frame, and the first exhaust channel is connected to the second exhaust channel, the frame is provided with a second pressure relief portion, and the second pressure relief portion is used to connect to the second exhaust channel.

[0009] In some embodiments, the box body further includes a cross beam disposed in the accommodation cavity, and the cross beam connects the first liquid cooling member and the frame. A third exhaust passage is formed in the cross beam, and the third exhaust passage communicates with the first exhaust passage and the second exhaust passage.

[0010] In some embodiments, a second exhaust port is formed on a side of the cross beam facing the first liquid cooling member, and the second exhaust port communicates with the third exhaust passage and at least one of the first exhaust ports respectively;

[0011] A third exhaust port is formed on a side of the frame facing the cross beam, and the third exhaust port communicates with the third exhaust passage and the second exhaust passage respectively;

[0012] The flow-through area of the second exhaust port is not less than that of the first exhaust port, and the flow-through area of the third exhaust port is not less than that of the second exhaust port.

[0013] In some embodiments, the flow-through areas of the first exhaust port, the second exhaust port, and the third exhaust port gradually increase.

[0014] In some embodiments, the battery pack has an intersecting first direction and second direction;

[0015] The frame includes a first side beam, a second side beam, a third side beam, and a fourth side beam that are connected to each other. The first side beam and the third side beam are spaced apart in the first direction, the second side beam and the fourth side beam are spaced apart in the second direction, and the interiors of the first side beam, the second side beam, the third side beam, and the fourth side beam communicate with each other to form the second exhaust passage;

[0016] A plurality of cross beams are provided, and the plurality of cross beams are spaced apart along the second direction. The cross beams are respectively connected to the first side beam and the third side beam, and at least one of the first side beam and the third side beam is provided with the third exhaust port.

[0017] In some embodiments, in the second direction, a fourth exhaust port is formed on a side of the cross beam close to the second side beam facing the second side beam, the fourth exhaust port communicates with the third exhaust passage, a fifth exhaust port is formed on a side of the second side beam facing the fourth exhaust port, the fifth exhaust port communicates with the second exhaust passage, and the fourth exhaust port communicates with the fifth exhaust port;

[0018] And / or, in the second direction, on the side of the cross beam close to the fourth side beam facing the fourth side beam, a sixth exhaust port is provided, the sixth exhaust port communicates with the third exhaust passage, on the side of the fourth side beam facing the sixth exhaust port, a seventh exhaust port is provided, the seventh exhaust port communicates with the second exhaust passage, and the sixth exhaust port communicates with the seventh exhaust port.

[0019] In some embodiments, the box body further includes a support member having a cavity;

[0020] The cross beam close to the second side beam and the second side beam are spaced apart in the second direction, and the support member is respectively connected to the cross beam and the second side beam, and the cavity communicates with the fourth exhaust port and the fifth exhaust port;

[0021] In some embodiments, the box body further includes a support member having a cavity;

[0022] The cross beam close to the fourth side beam and the fourth side beam are spaced apart in the second direction, and the support member is respectively connected to the cross beam and the fourth side beam, and the cavity communicates with the sixth exhaust port and the seventh exhaust port.

[0023] In some embodiments, at least a part of the second liquid cooling member is spaced between the liquid cooling channel and the first exhaust channel.

[0024] Correspondingly, an electrical device according to an embodiment of the present application includes the above battery pack.

[0025] Beneficial effects: The battery pack of the embodiment of the present application includes a box, a composite component and a plurality of batteries, the box includes a bottom plate and a frame connected to each other, the frame and the bottom plate enclose a receiving cavity; the composite component is arranged in the receiving cavity, the composite component includes a first liquid cooling part, a second liquid cooling part and a gas collecting part arranged in layers, the first liquid cooling part and the second liquid cooling part enclose a liquid cooling channel, and the gas collecting part and the second liquid cooling part enclose a first exhaust channel. The liquid cooling channel and the first exhaust channel are arranged at intervals from each other, and the first liquid cooling part and the second liquid cooling part are penetrated by a plurality of first exhaust ports connected to the first exhaust channel; a plurality of batteries are arranged in the receiving cavity, the batteries are located on the side of the first liquid cooling part away from the bottom plate, the batteries are connected to the first liquid cooling part, and the side of the batteries facing the first liquid cooling part is provided with a first pressure relief part; the first pressure relief part is used to connect at least one first exhaust port. A second exhaust channel is provided in the frame, and the first exhaust channel is connected to the second exhaust channel, the frame is provided with a second pressure relief part, and the second pressure relief part is used to connect to the second exhaust channel. The gas collecting part is located on the side of the second liquid cooling part away from the first liquid cooling part and forms a first exhaust channel with the second liquid cooling part. When the battery has thermal runaway, the first pressure relief part sprays high-temperature and high-pressure gas from the first exhaust port into the first exhaust channel. The high-temperature and high-pressure gas is guided by the first exhaust channel and the second exhaust channel and finally discharged from the box body by the second pressure relief part, so as to realize the directional and rapid discharge of the high-temperature and high-pressure gas. As an independent structure, the gas collecting part can be flexibly adjusted according to the battery arrangement structure. At the same time, the first exhaust channel is integrated in the liquid cooling channel, which reduces the space occupied by the battery pack and is conducive to using the liquid cooling structure to reduce the temperature of the high-temperature and high-pressure gas and improve the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the structure of the battery pack box and the composite assembly of the embodiment of the present application;

[0028] Figure 2 is a schematic diagram of the exploded structure of the battery pack according to an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of an exploded structure of a battery pack from another perspective of an embodiment of the present application;

[0030] Figure 4 is a cross-sectional view of a frame and a composite component of an embodiment of the present application from one perspective;

[0031] Figure 5 yes Figure 4 A partial enlarged view of part A;

[0032] Figure 6 is a cross-sectional view of another perspective of the frame and the composite component in the embodiment of the present application;

[0033] Figure 7 is Figure 6 a partial enlarged view of part B in

[0034] Figure 8 is a partial cross-sectional view of the embodiment of the present application for showing the fourth exhaust port, the cavity and the fifth exhaust port;

[0035] Figure 9 is a partial cross-sectional view of the embodiment of the present application for showing the second exhaust passage;

[0036] Reference numerals: 1, box body; 10, bottom plate; 11, frame; 110, second exhaust passage; 111, third exhaust port; 112, first side beam; 113, second side beam; 114, third side beam; 115, fourth side beam; 116, fifth exhaust port; 12, accommodation cavity; 13, second pressure relief part; 14, cross beam; 140, third exhaust passage; 141, second exhaust port; 142, fourth exhaust port; 15, support member; 150, cavity; 2, composite component; 20, liquid cooling passage; 21, first exhaust passage; 22, first exhaust port; 23, first liquid cooling member; 24, second liquid cooling member; 25, gas collecting member; 3, battery; 30, first pressure relief part; X, first direction; Y, second direction; Z, third direction. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, and at least one means one, two or more, unless otherwise specifically defined.

[0039] Referring to Figures 1 to 9 , a battery pack includes a box body 1, a composite component 2, and a plurality of batteries 3.

[0040] Among them, the box body 1 includes a bottom plate 10 and a frame 11 that are connected to each other. The frame 11 surrounds the bottom plate 10, and the frame 11 and the bottom plate 10 enclose a receiving cavity 12. A second exhaust channel 110 is provided inside the frame 11, and a second pressure relief part 13 is provided on the frame 11. The second pressure relief part 13 is used to communicate with the second exhaust channel 110.

[0041] The composite component 2 is disposed in the receiving cavity 12. The composite component 2 includes a first liquid cooling member 23, a second liquid cooling member 24, and a gas collecting member 25 that are stacked. The gas collecting member 25 is disposed between the second liquid cooling member 24 and the bottom plate 10, and the first liquid cooling member 23 is disposed on the side of the second liquid cooling member 24 away from the bottom plate 10. The first liquid cooling member 23 and the second liquid cooling member 24 enclose a liquid cooling channel 20, and the gas collecting member 25 and the second liquid cooling member 24 enclose a first exhaust channel 21. The liquid cooling channel 20 and the first exhaust channel 21 are spaced apart from each other, and a plurality of first exhaust ports 22 communicating with the first exhaust channel 21 are provided through the first liquid cooling member 23 and the second liquid cooling member 24.

[0042] A plurality of batteries 3 are disposed in the receiving cavity 12. The batteries 3 are located on the side of the first liquid cooling member 23 away from the bottom plate 10, and the batteries 3 are connected to the first liquid cooling member 23. A first pressure relief part 30 is provided on the side of the battery 3 facing the first liquid cooling member 23. The first pressure relief part 30 is used to communicate with at least one first exhaust port 22, and the first exhaust channel 21 communicates with the second exhaust channel 110.

[0043] It should be noted that in the embodiments of the present application, the first direction X, the second direction Y, and the third direction Z that intersect pairwise are introduced. Among them, the first direction X is substantially parallel to the width direction of the overall battery pack, the second direction Y is substantially parallel to the length direction of the overall battery pack, and the third direction Z is substantially parallel to the height direction of the overall battery pack.

[0044] The gas collecting member 25 is stacked on one side of the second liquid cooling member 24 away from the first liquid cooling member 23 in the third direction Z, that is, the guiding path of the formed first exhaust passage 21 is located on the side of the first liquid cooling member 23 and the second liquid cooling member 24 away from the battery 3. When the battery 3 has a thermal runaway, the first pressure relief portion 30 ejects high-temperature and high-pressure gas into the first exhaust passage 21 from the first exhaust port 22. The high-temperature and high-pressure gas is guided by the first exhaust passage 21 and the second exhaust passage 110 and finally discharged from the second pressure relief portion 13 out of the box body 1, realizing the directional and rapid discharge of the high-temperature and high-pressure gas. The gas collecting member 25, as an independent structure, can be flexibly adjusted according to the layout structure of the battery 3. At the same time, the first exhaust passage 21 is integrated at the liquid cooling passage 20, reducing the space occupied by the battery pack, being beneficial to using the liquid cooling structure to reduce the temperature of the high-temperature and high-pressure gas, and improving the safety of the battery pack.

[0045] In addition, referring to Figure 2 , the box body 1 further includes a bottom plate 10. The bottom plate 10 is connected to one side of the second liquid cooling member 24 away from the first liquid cooling member 23 to form the bottom sealing structure of the battery pack. The gas collecting member 25 is located between the bottom plate 10 and the second liquid cooling member 24, thereby preventing the high-temperature and high-pressure gas from directly impacting the bottom plate 10 and causing problems such as bottom sealing failure.

[0046] In some embodiments, referring to Figure 1 , Figure 2 and Figure 6 and Figure 7 , the box body 1 further includes a cross beam 14. The cross beam 14 is disposed in the accommodation cavity 12. The cross beam 14 is connected to the first liquid cooling member 23 and the frame 11. The cross beam 14 has a third exhaust passage 140 therein, and the third exhaust passage 140 communicates with the first exhaust passage 21 and the second exhaust passage 110.

[0047] On the one hand, the cross beam 14 serves as a support structure to further enhance the structural strength of the box body 1. On the other hand, when the battery 3 has a thermal runaway, the third exhaust passage 140 provided by the cross beam 14 allows the high-temperature and high-pressure gas to communicate with the first exhaust passage 21 and the second exhaust passage 110, being beneficial to increasing the exhaust space of the high-temperature and high-pressure gas and improving the protection of the box body 1.

[0048] Specifically, in some embodiments, synchronously referring to Figure 8 , a second exhaust port 141 is formed on one side of the cross beam 14 facing the first liquid cooling member 23, and the second exhaust port 141 communicates with the third exhaust passage 140 and at least one first exhaust port 22 respectively.

[0049] On one side of the frame 11 facing the crossbeam 14, a third exhaust port 111 is provided. The third exhaust port 111 is respectively communicated with a third exhaust passage 140 and a second exhaust passage 110. The flow-through area of the second exhaust port 141 is not less than the flow-through area of the first exhaust port 22, and the flow-through area of the third exhaust port 111 is not less than the flow-through area of the second exhaust port 141.

[0050] When the battery 3 has a thermal runaway, the high-temperature and high-pressure gas enters the first exhaust passage 21 through the first exhaust port 22, enters the third exhaust passage 140 through the second exhaust port 141, and enters the second exhaust passage 110 through the third exhaust port 111. Setting the flow-through area of the second exhaust port 141 not less than the flow-through area of the first exhaust port 22, and setting the flow-through area of the third exhaust port 111 not less than the flow-through area of the second exhaust port 141 is beneficial to reducing the resistance of the high-temperature and high-pressure gas flowing into the third exhaust passage 140 and the second exhaust passage 110, and improving the exhaust smoothness.

[0051] In addition, it should be noted that in this embodiment, the flow-through area of the first exhaust port 22 is not less than the flow-through area in the connected state of the corresponding first pressure relief part 30, and at the same time, the flow-through area of the first exhaust port 22 communicating with the second exhaust port 141 is not less than the flow-through area of the first exhaust port 22 corresponding to the first pressure relief part 30. This is beneficial to ensuring the exhaust efficiency when the battery 3 has a thermal runaway.

[0052] In some embodiments, referring to Figures 6 to 8 , the flow-through areas of the first exhaust port 22, the second exhaust port 141, and the third exhaust port 111 gradually increase. By sequentially increasing the flow-through areas of the first exhaust port 22, the second exhaust port 141, and the third exhaust port 111, it is beneficial to further ensure the smoothness of the exhaust guided by the crossbeam 14 and the frame 11.

[0053] In some embodiments, referring to Figures 2 to 4 , the frame 11 includes a first side beam 112, a second side beam 113, a third side beam 114, and a fourth side beam 115 connected in sequence. The first side beam 112 and the third side beam 114 are spaced apart in the first direction X, the second side beam 113 and the fourth side beam 115 are spaced apart in the second direction Y, and the interiors of the first side beam 112, the second side beam 113, the third side beam 114, and the fourth side beam 115 are interconnected to form a second exhaust passage 110.

[0054] There are multiple crossbeams 14, and the multiple crossbeams 14 are spaced apart along the second direction Y. The crossbeams 14 are respectively connected to the first side beam 112 and the third side beam 114, and at least one of the first side beam 112 and the third side beam 114 is provided with a third exhaust port 111.

[0055] In this embodiment, two cross beams 14 are provided as an example. In other embodiments, the number of cross beams 14 can be flexibly adjusted according to the specifications of the battery pack.

[0056] Synchronous reference Figure 8 In this embodiment, both ends of the cross beam 14 in the first direction X are connected to the third exhaust channel 140, and the corresponding first side beam 112 and the third side beam 114 are both provided with a third exhaust port 111 to form multiple exhaust passages to improve the exhaust guiding efficiency.

[0057] In addition, the synchronization reference Figure 1 and Figure 2 The multiple batteries 3 are sequentially formed into multiple columns in the first direction X, and each column of batteries 3 is arranged along the second direction Y. A plurality of gas collectors 25 are provided, and the multiple gas collectors 25 are arranged at intervals in the first direction X, and the gas collectors 25 extend along the second direction Y and are arranged corresponding to each column of batteries 3 .

[0058] Specifically, in this embodiment, four columns of batteries 3 are taken as an example in the first direction X. In other embodiments, the number of columns of batteries 3 can be flexibly adjusted according to the specifications of the battery pack. Correspondingly, four gas collectors 25 are provided. The gas collector 25 forms a first exhaust channel 21 corresponding to each column of batteries 3, and the cross beam 14 forms a second exhaust port 141 corresponding to each first exhaust channel 21 to synchronously guide the exhaust of each column of batteries 3.

[0059] In some embodiments, reference Figure 2 , Figure 8 and Figure 9 In the second direction Y, a fourth exhaust port 142 is provided on a side of the cross beam 14 close to the second side beam 113 toward the second side beam 113, and the fourth exhaust port 142 is connected to the third exhaust channel 140. A fifth exhaust port 116 is provided on a side of the second side beam 113 toward the fourth exhaust port 142, and the fifth exhaust port 116 is connected to the second exhaust channel 110, and the fourth exhaust port 142 is connected to the fifth exhaust port 116.

[0060] In this embodiment, the second pressure relief portion 13 is also arranged on the side of the second side beam 113 away from the cross beam 14. By providing the fourth exhaust port 142 and the fifth exhaust port 116, an additional exhaust branch connecting the second exhaust channel 110 and the third exhaust channel 140 is formed, which is conducive to further improving the pressure relief and exhaust efficiency when the battery 3 has thermal runaway.

[0061] In some embodiments, reference Figure 3 and Figure 9, the box body 1 further includes a support member 15 which has a cavity 150. The cross beam 14 close to the second side beam 113 and the second side beam 113 are spaced apart in the second direction Y, and the support member 15 is respectively connected to the cross beam 14 and the second side beam 113, and the cavity 150 communicates with the fourth exhaust port 142 and the fifth exhaust port 116. It can be understood that, in addition to strengthening the structure of the box body 1, the cross beam 14 also plays a role in spacing the batteries 3 in the accommodation cavity 12. The cross beam 14 needs to be in contact with the batteries 3. To adapt to the expansion of the batteries 3 during operation, the support member 15 further strengthens the structural strength formed by the cross beam 14 and the frame 11.

[0062] In addition, it can be understood that in other embodiments, similar to the above structure, in the second direction Y, the cross beam 14 close to the fourth side beam 115 may also be provided with a sixth exhaust port on one side facing the fourth side beam 115. The sixth exhaust port communicates with the third exhaust passage 140. The fourth side beam 115 is provided with a seventh exhaust port on one side facing the sixth exhaust port. The seventh exhaust port communicates with the second exhaust passage 110, and the sixth exhaust port communicates with the seventh exhaust port. The sixth exhaust port and the seventh exhaust port can also form an additional exhaust branch communicating the second exhaust passage 110 and the third exhaust passage 140, which is beneficial to further improving the pressure relief and exhaust efficiency when the battery 3 undergoes thermal runaway.

[0063] Similarly, in other embodiments, the cross beam 14 close to the fourth side beam 115 and the fourth side beam 115 are spaced apart in the second direction Y and the above-mentioned support member 15 may also be provided. The support member 15 is respectively connected to the cross beam 14 and the fourth side beam 115, and the cavity 150 communicates with the sixth exhaust port and the seventh exhaust port.

[0064] In addition, in some embodiments, referring to Figure 5 , at least part of the second liquid cooling member 24 is spaced between the liquid cooling channel 20 and the first exhaust channel 21. In this embodiment, part of the gas collecting member 25 extends to the area where the liquid cooling channel 20 is located and is connected to the second liquid cooling member 24, so that the liquid cooling channel 20 and the first exhaust channel 21 can be spaced by the second liquid cooling member 24, which is beneficial for the cooling medium introduced into the liquid cooling channel 20 to indirectly contact the gas collecting member 25 and the gas in the first exhaust channel 21, so as to cool the high-temperature and high-pressure gas when the high-temperature and high-pressure gas is discharged in the first exhaust channel 21 and improve the safety of the battery pack.

[0065] Correspondingly, an embodiment of the present application provides an electrical device, which includes the above-mentioned battery pack. The electrical device can be an electronic device, a power storage device, or a power vehicle, etc. It can be understood that the electrical device can have all the technical features and corresponding beneficial effects of the above-mentioned battery pack, which will not be elaborated here.

[0066] The above has introduced in detail a battery pack and an electrical device provided by the embodiments of the present application, and specific examples have been used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A box body (1), the box body (1) comprising a bottom plate (10) and a frame (11) connected to each other, the frame (11) surrounding the bottom plate (10), and the frame (11) and the bottom plate (10) enclosing a receiving cavity (12); A composite component (2), the composite component (2) being arranged in the accommodating cavity (12), the composite component (2) comprising a first liquid cooling element (23), a second liquid cooling element (24) and an air collecting element (25) which are arranged in a stacked manner, the air collecting element (25) being arranged between the second liquid cooling element (24) and the bottom plate (10), and the first liquid cooling element (23) being arranged on a side of the second liquid cooling element (24) away from the bottom plate (10), the first liquid cooling element (23) and the second liquid cooling element (24) forming a liquid cooling channel (20), and the air collecting element (25) and the second liquid cooling element (24) forming a first exhaust channel (21), the liquid cooling channel (20) and the first exhaust channel (21) being arranged at intervals from each other, and the first liquid cooling element (23) and the second liquid cooling element (24) being provided with a plurality of first exhaust ports (22) which are connected to the first exhaust channel (21); A plurality of batteries (3), wherein the plurality of batteries (3) are arranged in the accommodating cavity (12), the batteries (3) are located on a side of the first liquid cooling component (23) away from the bottom plate (10), and the batteries (3) are connected to the first liquid cooling component (23), and a first pressure relief portion (30) is provided on a side of the batteries (3) facing the first liquid cooling component (23); The first pressure relief portion (30) is used to connect to at least one of the first exhaust ports (22); a second exhaust channel (110) is provided in the frame (11), and the first exhaust channel (21) is connected to the second exhaust channel (110); the frame (11) is provided with a second pressure relief portion (13), and the second pressure relief portion (13) is used to connect to the second exhaust channel (110).

2. The battery pack according to claim 1, characterized in that: The box body (1) further comprises a crossbeam (14), wherein the crossbeam (14) is arranged in the accommodating cavity (12), and the crossbeam (14) connects the first liquid cooling component (23) and the frame (11), and the crossbeam (14) has a third exhaust channel (140) in it, and the third exhaust channel (140) is connected to the first exhaust channel (21) and the second exhaust channel (110).

3. The battery pack according to claim 2, characterized in that: A second exhaust port (141) is provided on a side of the crossbeam (14) facing the first liquid cooling member (23), and the second exhaust port (141) is respectively connected to the third exhaust channel (140) and at least one of the first exhaust ports (22); A third exhaust port (111) is provided on a side of the frame (11) facing the crossbeam (14), and the third exhaust port (111) is connected to the third exhaust channel (140) and the second exhaust channel (110) respectively; The flow area of ​​the second exhaust port (141) is not less than the flow area of ​​the first exhaust port (22), and the flow area of ​​the third exhaust port (111) is not less than the flow area of ​​the second exhaust port (141).

4. The battery pack according to claim 3, characterized in that: The flow area of ​​the first exhaust port (22), the flow area of ​​the second exhaust port (141) and the flow area of ​​the third exhaust port (111) gradually increase.

5. The battery pack according to claim 3, characterized in that: The battery pack has a first direction (X) and a second direction (Y) intersecting each other; The frame (11) comprises a first side beam (112), a second side beam (113), a third side beam (114) and a fourth side beam (115) which are connected to each other, the first side beam (112) and the third side beam (114) are arranged at intervals in the first direction (X), the second side beam (113) and the fourth side beam (115) are arranged at intervals in the second direction (Y), and the first side beam (112), the second side beam (113), the third side beam (114) and the fourth side beam (115) are internally connected to each other to form the second exhaust channel (110); A plurality of the cross beams (14) are provided, and the plurality of cross beams (14) are arranged at intervals along the second direction (Y); the cross beams (14) are respectively connected to the first side beam (112) and the third side beam (114); and at least one of the first side beam (112) and the third side beam (114) is provided with the third exhaust port (111).

6. The battery pack according to claim 5, characterized in that: In the second direction (Y), the cross beam (14) close to the second side beam (113) is provided with a fourth exhaust port (142) on a side facing the second side beam (113), the fourth exhaust port (142) being connected to the third exhaust channel (140); the second side beam (113) is provided with a fifth exhaust port (116) on a side facing the fourth exhaust port (142), the fifth exhaust port (116) being connected to the second exhaust channel (110), and the fourth exhaust port (142) being connected to the fifth exhaust port (116); And / or, in the second direction (Y), the cross beam (14) close to the fourth side beam (115) is provided with a sixth exhaust port on a side facing the fourth side beam (115), the sixth exhaust port is connected to the third exhaust channel (140), and the fourth side beam (115) is provided with a seventh exhaust port on a side facing the sixth exhaust port, the seventh exhaust port is connected to the second exhaust channel (110), and the sixth exhaust port is connected to the seventh exhaust port.

7. The battery pack according to claim 6, characterized in that: The box body (1) further comprises a support member (15), wherein the support member (15) has a cavity (150); The cross beam (14) and the second side beam (113) close to the second side beam (113) are spaced apart in the second direction (Y), and the support member (15) is respectively connected to the cross beam (14) and the second side beam (113), and the cavity (150) is connected to the fourth exhaust port (142) and the fifth exhaust port (116).

8. The battery pack according to claim 6, characterized in that: The box body (1) further comprises a support member (15), wherein the support member (15) has a cavity (150); The cross beam (14) close to the fourth side beam (115) and the fourth side beam (115) are arranged at intervals in the second direction (Y), and the support member (15) is respectively connected to the cross beam (14) and the fourth side beam (115), and the cavity (150) is connected to the sixth exhaust port and the seventh exhaust port.

9. The battery pack according to claim 1, characterized in that: At least a portion of the second liquid cooling member (24) is spaced between the liquid cooling channel (20) and the first exhaust channel (21).

10. An electrical device, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 9.

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