Battery pack and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack and an electric device. The battery pack comprises a box body, a cooling structure and a battery pack, two first exhaust channels are arranged on the two sides of the box body in the first direction. The cooling structure is arranged in the box body, second exhaust channels are formed in the two sides, in the first direction, of the cooling structure, and the two second exhaust channels communicate with the two first exhaust channels in a one-to-one correspondence mode; the battery pack is arranged on the cooling structure and comprises a plurality of first battery cells and a plurality of second battery cells, the first battery cells and the second battery cells are alternately arranged, the battery pack is provided with a first end and a second end which are oppositely arranged in the first direction, the first battery cells are provided with first anti-explosion structures close to the first ends, and the second battery cells are provided with second anti-explosion structures close to the second ends. And the first explosion-proof structure and the second explosion-proof structure can communicate with the two second exhaust channels in a one-to-one correspondence manner, so that the safety of the battery pack can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] With the rise of new energy vehicles, battery pack range has become a hot research topic. To improve battery pack range, energy density is constantly being increased, and battery modules are gradually being eliminated, with cells directly installed inside the battery pack housing, thus significantly improving energy density. Furthermore, blade cells, due to their high energy density and other characteristics, are directly integrated into the battery pack housing, forming LCTP (Liquid Crystal Per Pack) battery packs.

[0003] However, with the increase in battery pack energy density, thermal runaway safety has become a focal point in the industry. This includes not only rapid pressure release during cell thermal runaway but also the problem of heat propagation between cells. Achieving rapid pressure release from cells and suppressing heat propagation between adjacent cells to achieve thermoelectric separation is a major challenge in battery pack safety. Currently, thermal insulation materials are often placed between adjacent cells in battery packs to suppress heat propagation. However, substances ejected during thermal runaway of a single cell may spray onto other cells or electrical connection structures, inevitably affecting other cells and creating safety hazards within the battery pack.

[0004] Therefore, there is an urgent need for a battery pack and power supply device to solve the above-mentioned technical problems. Utility Model Content

[0005] One objective of this invention is to provide a battery pack that can achieve thermoelectric separation and greatly suppress heat spread between adjacent cells, thereby improving the safety of the battery pack.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Battery pack, including:

[0008] The housing has two first exhaust channels on both sides along the first direction;

[0009] A cooling structure is provided inside the aforementioned housing. The cooling structure has second exhaust channels on both sides along the aforementioned first direction. The two aforementioned second exhaust channels are connected to the two aforementioned first exhaust channels in a one-to-one correspondence.

[0010] A battery pack is disposed in the aforementioned cooling structure. The battery pack includes a plurality of first cells and a plurality of second cells, which are arranged alternately. The battery pack has a first end and a second end disposed opposite to each other along the aforementioned first direction. A first explosion-proof structure is provided near the first end of the first cell, and a second explosion-proof structure is provided near the second end of the second cell. The first explosion-proof structure and the second explosion-proof structure are respectively connected to the two aforementioned second exhaust channels.

[0011] Optionally, the first battery cell includes a first housing and a first end cap, the first end cap being sealed to the opening of the first housing, the first housing having a dimension L1 along the first direction, and the distance between the first explosion-proof structure and the first end cap being A, where 0.8L1≤A≤0.9L1; and / or,

[0012] The second battery cell includes a second housing and a second end cap. The second end cap is sealed to the opening of the second housing. The dimension of the second housing along the first direction is L2. The distance between the second explosion-proof structure and the second end cap is B, where 0.8L2≤B≤0.9L2.

[0013] Optionally, the dimension of the first battery cell along the first direction is L3, and the dimension of the first explosion-proof structure along the first direction is C, where L3 / 10 ≤ C ≤ L3 / 7; and / or,

[0014] The dimension of the second battery cell along the first direction is L4, and the dimension of the second explosion-proof structure along the first direction is D, where L4 / 10≤D≤L4 / 7.

[0015] Optionally, the cooling structure is provided with a plurality of first connecting holes and a plurality of second connecting holes, the first connecting holes and the second connecting holes being respectively connected to two of the second exhaust channels, the plurality of first connecting holes being provided one-to-one with the plurality of first explosion-proof structures, and the plurality of second connecting holes being provided one-to-one with the plurality of second explosion-proof structures.

[0016] Optionally, the cooling structure further includes multiple cooling channels, which are arranged sequentially and located between the two second exhaust channels. Coolant circulates in the cooling channels, and the coolant in the cooling channel adjacent to the second exhaust channel can cool the gas in the corresponding second exhaust channel.

[0017] Optionally, the aforementioned housing is provided with side beams on both sides along the first direction, and the aforementioned side beams are provided with the aforementioned first exhaust passage. The outer wall of the aforementioned side beams is sealed with an explosion-proof valve so that the explosion-proof valve is connected to the aforementioned first exhaust passage.

[0018] Optionally, the aforementioned housing also includes a crossbeam, with both ends of the crossbeam connected to the two aforementioned side beams respectively. The crossbeam contains two third exhaust channels, each of which is connected to a first exhaust channel and a corresponding second exhaust channel.

[0019] Optionally, the crossbeam is provided with a third connecting port and a fourth connecting port on both sides along the first direction, and the third connecting port and the fourth connecting port are respectively connected to the two third exhaust channels; the side beam is provided with a fifth connecting port, and the fifth connecting port is connected to the first exhaust channel, and the two fifth connecting ports are respectively sealed and connected to the third connecting port and the fourth connecting port.

[0020] Optionally, the two third exhaust channels are arranged sequentially along a second direction, which is perpendicular to the first direction. The cooling structure has a first connecting portion and a second connecting portion on one side along the second direction. The first connecting portion and the second connecting portion are respectively connected to the two third exhaust channels. The dimension of the second connecting portion along the second direction is larger than the dimension of the first connecting portion along the second direction. The first connecting portion is connected to the first third exhaust channel. The second connecting portion passes through the first third exhaust channel and is connected to the second third exhaust channel.

[0021] Another objective of this invention is to provide an electrical device comprising the battery pack described in any of the above embodiments.

[0022] The beneficial effects of this utility model are:

[0023] This invention provides a battery pack and electrical device. By dividing the battery cells into alternating first and second cells, with the first explosion-proof structure of the first cell and the second explosion-proof structure of the second cell positioned differently, and the first and second explosion-proof structures sequentially connected to two second exhaust channels and two first exhaust channels respectively, the exhaust paths of the first and / or second cells are not interconnected in the event of thermal runaway, thus greatly suppressing heat propagation between adjacent cells. Simultaneously, in the event of thermal runaway of the first and second cells, propellants such as gases are ejected from the corresponding explosion-proof structures and enter the corresponding second exhaust channels. Cooling by the cooling structure rapidly cools the propellants, which then exit the battery pack through the corresponding first exhaust channels, preventing them from entering the casing. This achieves thermoelectric separation and further improves the safety of the battery pack. Attached Figure Description

[0024] Figure 1 This is an isometric view of the battery pack provided in a specific embodiment of this utility model;

[0025] Figure 2 This is an exploded view of the battery pack provided in a specific embodiment of this utility model;

[0026] Figure 3 This is a top view of the battery pack provided in a specific embodiment of this utility model;

[0027] Figure 4 yes Figure 3 Cross-sectional view at point AA;

[0028] Figure 5 This is an isometric view of the battery pack provided in a specific embodiment of this utility model;

[0029] Figure 6 This is an isometric view of the first battery cell provided in a specific embodiment of this utility model;

[0030] Figure 7 This is an isometric view of the cooling structure provided in a specific embodiment of this utility model;

[0031] Figure 8 This is an axonometric view of the crossbeam provided in a specific embodiment of the present invention;

[0032] Figure 9 This is an axonometric view of the crossbeam provided in a specific embodiment of this utility model;

[0033] Figure 10 This is a cross-sectional view of the beam provided in a specific embodiment of this utility model.

[0034] In the picture:

[0035] 10. Box body; 11. Side beam; 111. First exhaust channel; 112. Fifth connecting port; 12. Crossbeam; 121. Third exhaust channel; 122. Third connecting port; 123. Fourth connecting port; 13. End plate; 14. Bottom plate;

[0036] 20. Cooling structure; 21. Second exhaust channel; 22. First connecting hole; 23. Second connecting hole; 24. Cooling channel; 25. First connecting part; 26. Second connecting part;

[0037] 30. Battery pack; 31. First battery cell; 311. First explosion-proof structure; 312. First housing; 313. First end cap; 32. Second battery cell; 321. Second explosion-proof structure;

[0038] 40. Explosion-proof valve. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] The following reference Figures 1 to 10 This invention introduces the battery pack and power supply device provided by this utility model.

[0044] It should be noted that the first direction is Figure 1 The X direction in the text is also the length direction of the first battery cell 31 and the second battery cell 32, and the second direction is... Figure 1 The Y direction in the diagram also corresponds to the thickness direction of the first battery cell 31 and the second battery cell 32. Figure 1 The X direction is the width direction of the first battery cell 31 and the second battery cell 32, and the X, Y and Z directions are perpendicular to each other.

[0045] This embodiment provides a battery pack for energy storage and external power supply. The battery pack can achieve thermoelectric separation, which greatly suppresses the heat spread between adjacent cells and improves the safety of the battery pack.

[0046] Please refer to Figures 1 to 5 Specifically, the battery pack includes a housing 10, a cooling structure 20, and a battery pack 30. The housing 10 has two first exhaust channels 111 on both sides along a first direction; the cooling structure 20 is disposed inside the housing 10, and the cooling structure 20 has second exhaust channels 21 on both sides along the first direction, with each of the two second exhaust channels 21 corresponding to one of the two first exhaust channels 111; the battery pack 30 is disposed on the cooling structure 20, and the battery pack 30 includes multiple first cells 31 and multiple second cells 32, arranged alternately. The battery pack 30 has a first end and a second end arranged opposite each other along the first direction. A first explosion-proof structure 311 is provided near the first end of the first cell 31, and a second explosion-proof structure 321 is provided near the second end of the second cell 32. The first explosion-proof structure 311 and the second explosion-proof structure 321 are respectively corresponding to one of the two second exhaust channels 21.

[0047] In this embodiment, the battery pack uses alternating first cells 31 and second cells 32. The first explosion-proof structure 311 of the first cell 31 and the second explosion-proof structure 321 of the second cell 32 are located at different positions. The first explosion-proof structure 311 and the second explosion-proof structure 321 are respectively connected to two second exhaust channels 21 and two first exhaust channels 111. This ensures that in the event of thermal runaway of the first cell 31 and / or the second cell 32, the exhaust paths of the first cell 31 and the second cell 32 are not interconnected, thus greatly suppressing the thermal propagation between adjacent cells. Simultaneously, in the event of thermal runaway of the first cell 31 and the second cell 32, gases or other ejected materials are ejected from the corresponding explosion-proof structures and enter the corresponding second exhaust channels 21. The cooling structure 20 then rapidly cools the gases or other ejected materials, which are then discharged from the battery pack through the corresponding first exhaust channels 111. This also prevents gases or other ejected materials from entering the housing 10, achieving thermal-electric separation and further improving the safety of the battery pack.

[0048] Please refer to Figure 6Optionally, the first battery cell 31 includes a first housing 312 and a first end cap 313. The first end cap 313 is sealed to the opening of the first housing 312. The dimension of the first housing 312 along the first direction is L1, and the distance between the first explosion-proof structure 311 and the first end cap 313 is A, where 0.8L1≤A≤0.9L1. This ensures that the first explosion-proof structure 311 is closest to the exhaust channel in the event of thermal runaway of the first battery cell 31, achieving rapid pressure relief. In this embodiment, the first end cap 313 is located at the second end, therefore, the first explosion-proof structure 311 is closer to the first end. For example, the length of the first battery cell 31 is 300-1200mm, and the distance between the first explosion-proof structure 311 and the first end is 50mm-80mm, which ensures that the exhaust path is shortest after thermal runaway of the first battery cell 31.

[0049] Optionally, the second battery cell 32 includes a second housing and a second end cap. The second end cap is sealed to the opening of the second housing. The dimension of the second housing along the first direction is L2, and the distance between the second explosion-proof structure 321 and the second end cap is B, where 0.8L2≤B≤0.9L2. This ensures that the second explosion-proof structure 321 is closest to the exhaust channel in the event of thermal runaway of the second battery cell 32, achieving rapid pressure relief. In this embodiment, the second end cap is located at the first end, therefore, the second explosion-proof structure 321 is closer to the second end. For example, the length of the second battery cell 32 is 300-1200mm, and the distance between the second explosion-proof structure 321 and the second end is 50mm-80mm, which ensures that the exhaust path is shortest after thermal runaway of the second battery cell 32.

[0050] Further optionally, the dimension of the first battery cell 31 along the first direction is L3, and the dimension of the first explosion-proof structure 311 along the first direction is C, where L3 / 10≤C≤L3 / 7; this can ensure that the gas generated by the thermal runaway of the first battery cell 31 is quickly discharged, and avoid the first shell 312 from rupturing due to the surge in internal pressure of the first battery cell 31.

[0051] Further optionally, the dimension of the second battery cell 32 along the first direction is L4, and the dimension of the second explosion-proof structure 321 along the first direction is D, where L4 / 10≤D≤L4 / 7; this can ensure that the gas generated by the thermal runaway of the second battery cell 32 is discharged quickly, and avoid the second shell from rupturing due to the surge in internal pressure of the second battery cell 32.

[0052] Of course, both the first cell 31 and the second cell 32 also include a cell body, which is disposed in the corresponding housing. This is a common structure in the field and will not be described in detail here.

[0053] Please refer to Figure 4 and Figure 7Furthermore, the cooling structure 20 has multiple first connecting holes 22 and multiple second connecting holes 23. The first connecting holes 22 and the second connecting holes 23 are respectively connected to two second exhaust channels 21. The multiple first connecting holes 22 are configured one-to-one with the multiple first explosion-proof structures 311, and the multiple second connecting holes 23 are configured one-to-one with the multiple second explosion-proof structures 321, so that the first explosion-proof structures 311 and the second explosion-proof structures 321 are respectively connected to the two second exhaust channels 21.

[0054] Optionally, the battery pack 30 and the cooling structure 20 can be fixed by adhesive, which can also achieve a sealed connection between the first explosion-proof structure 311 and the first connecting hole 22, as well as a sealed connection between the second explosion-proof structure 321 and the second connecting hole 23, so that when the cell thermally runs away, the corresponding gas will not enter the housing 10, thus achieving hot spot separation.

[0055] Furthermore, the cooling structure 20 also includes multiple cooling channels 24, which are arranged sequentially and located between two second exhaust channels 21. Coolant circulates in the cooling channels 24, and the coolant in the cooling channel 24 adjacent to the second exhaust channel 21 can cool the gas in the corresponding second exhaust channel 21, thereby realizing the cooling of the battery pack 30 by the cooling structure 20 and the rapid cooling of the exhaust gas by the cooling structure 20.

[0056] Optionally, the cooling structure 20 also includes a connecting pipe, which is disposed on the housing and communicates with the cooling channel 24 to realize the circulation of coolant in the cooling channel 24.

[0057] Please refer to Figures 1 to 4 In this embodiment, the housing 10 includes two side beams 11, two end plates 13 and a bottom plate 14. The two side beams 11 are arranged opposite each other along a first direction, and the two end plates 13 are arranged opposite each other along a second direction. The two side beams 11, the two end plates 13 and the bottom plate 14 enclose and form a housing 10 structure with a space for accommodating the battery pack 30.

[0058] Optionally, the side beam 11 and the end plate 13, the side beam 11 and the bottom plate 14, and the end plate 13 and the bottom plate 14 are all fixed by welding or other fixing methods, so that the box body 10 has high connection strength and good sealing performance.

[0059] Of course, the battery pack also includes a cover, which is sealed to the opening of the housing 10 to form a sealed structure for protecting the battery pack 30 inside the battery pack.

[0060] Specifically, the housing 10 is provided with side beams 11 on both sides along the first direction. A first exhaust channel 111 is opened in the side beam 11. An explosion-proof valve 40 is sealed to the outer wall of the side beam 11 so that the explosion-proof valve 40 is connected to the first exhaust channel 111. The explosion-proof valve 40 can realize the rapid ejection of gas in the battery pack, thereby realizing the rapid depressurization of the battery pack and ensuring the safety of the battery pack.

[0061] Please refer to Figure 2 , Figure 3 , Figures 8 to 10 Furthermore, the housing 10 also includes a crossbeam 12, with both ends of the crossbeam 12 connected to two side beams 11 respectively. Two third exhaust channels 121 are opened in the crossbeam 12, and each third exhaust channel 121 is connected to a first exhaust channel 111 and a corresponding second exhaust channel 21 to realize the connection between the first exhaust channel 111 and the second exhaust channel 21.

[0062] Optionally, the crossbeam 12 and the side beam 11 are fixed together by welding or other fixing methods, which results in high connection strength and good sealing.

[0063] Specifically, the crossbeam 12 is provided with a third connecting port 122 and a fourth connecting port 123 on both sides along the first direction, and the third connecting port 122 and the fourth connecting port 123 are respectively connected to two third exhaust channels 121; the side beam 11 is provided with a fifth connecting port 112, which is connected to the first exhaust channel 111. The two fifth connecting ports 112 are respectively sealed and connected to the third connecting port 122 and the fourth connecting port 123, so that the two first exhaust channels 111 and the two third exhaust channels 121 are connected one-to-one, so that the gas in the third exhaust channel 121 can enter the first exhaust channel 111 and be discharged and depressurized by the corresponding explosion-proof valve 40.

[0064] Specifically, two third exhaust channels 121 are arranged sequentially along the second direction, which is perpendicular to the first direction. The cooling structure 20 has a first connecting part 25 and a second connecting part 26 on one side along the second direction. The first connecting part 25 and the second connecting part 26 are respectively connected to the two second exhaust channels 21. The dimension of the second connecting part 26 along the second direction is larger than the dimension of the first connecting part 25 along the second direction. The first connecting part 25 is connected to the first third exhaust channel 121. The second connecting part 26 passes through the first third exhaust channel 121 and is connected to the second third exhaust channel 121. This achieves a one-to-one correspondence between the two third exhaust channels 121 and the two second exhaust channels 21, allowing the gas in the second exhaust channel 21 to enter the third exhaust channel 121, then enter the first exhaust channel 111, and be discharged and depressurized by the corresponding explosion-proof valve 40.

[0065] Optionally, the first connecting part 25 and the third exhaust channel 121, and the second connecting part 26 and the third exhaust channel 121 can be connected by adhesive bonding to achieve sealing of the exhaust path.

[0066] The following reference Figures 1 to 10 This invention describes the exhaust path of the battery pack provided by this utility model.

[0067] When the first cell 31 experiences thermal runaway, the gas inside the first cell 31 is ejected through the first explosion-proof structure 311, enters one of the second exhaust channels 21 through the first connecting hole 22, then enters the third exhaust channel 121 through the first connecting part 25, and enters the corresponding first exhaust channel 111 through the third connecting hole and the corresponding fifth connecting hole, and is discharged through the explosion-proof valve 40 in the first exhaust channel 111, thus achieving rapid pressure relief of the first cell 31. Simultaneously, even if the ejected gas affects other first cells 31 through the second exhaust channels 21, the cooling effect of the cooling channels 24 in the cooling structure 20 weakens the heat spread to other first cells 31. Furthermore, since each first cell 31 is connected to a second cell 32, the heat spread to other first cells 31 is further mitigated, improving the safety of the battery pack.

[0068] When the second cell 32 experiences thermal runaway, the gas inside the second cell 32 is ejected through the second explosion-proof structure 321, enters another second exhaust channel 21 through the second connecting hole 23, then enters the third exhaust channel 121 through the second connecting part 26, and enters the corresponding first exhaust channel 111 through the fourth connecting hole and the corresponding fifth connecting hole, and is discharged through the explosion-proof valve 40 in the first exhaust channel 111, thus achieving rapid pressure relief of the second cell 32. Simultaneously, even if the ejected gas affects other second cells 32 through the second exhaust channel 21, the cooling effect of the cooling channel 24 in the cooling structure 20 weakens the heat spread to other second cells 32. Furthermore, since each second cell 32 is connected to a first cell 31, the heat spread to other second cells 32 is further mitigated, improving the safety of the battery pack.

[0069] This embodiment also provides an electrical device that includes the battery pack described in any of the above-described solutions. Specifically, this electrical device can be an electric vehicle, a hybrid electric vehicle, an electric ship, an electric bicycle, an energy storage device, etc., as long as it uses the aforementioned battery pack for power supply or energy storage; no specific limitations are imposed here.

[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: The housing has two first exhaust channels on both sides along the first direction; A cooling structure is provided inside the box. The cooling structure has second exhaust channels on both sides along the first direction. The two second exhaust channels are connected to the two first exhaust channels in a one-to-one correspondence. A battery pack is disposed on the cooling structure. The battery pack includes a plurality of first cells and a plurality of second cells, which are arranged alternately. The battery pack has a first end and a second end that are disposed opposite to each other along the first direction. The first cell is provided with a first explosion-proof structure near the first end, and the second cell is provided with a second explosion-proof structure near the second end. The first explosion-proof structure and the second explosion-proof structure are respectively connected to two second exhaust channels.

2. The battery pack according to claim 1, characterized in that, The first battery cell includes a first housing and a first end cap. The first end cap is sealed to the opening of the first housing. The dimension of the first housing along the first direction is L1. The distance between the first explosion-proof structure and the first end cap is A, where 0.8L1≤A≤0.9L1; and / or, The second battery cell includes a second housing and a second end cap. The second end cap is sealed to the opening of the second housing. The dimension of the second housing along the first direction is L2. The distance between the second explosion-proof structure and the second end cap is B, where 0.8L2≤B≤0.9L2.

3. The battery pack according to claim 1, characterized in that, The dimension of the first battery cell along the first direction is L3, and the dimension of the first explosion-proof structure along the first direction is C, where L3 / 10 ≤ C ≤ L3 / 7; and / or, The second battery cell has a dimension of L4 along the first direction, and the second explosion-proof structure has a dimension of D along the first direction, where L4 / 10 ≤ D ≤ L4 / 7.

4. The battery pack according to claim 1, characterized in that, The cooling structure has multiple first connecting holes and multiple second connecting holes, which are respectively connected to two second exhaust channels. The multiple first connecting holes are configured one-to-one with the multiple first explosion-proof structures, and the multiple second connecting holes are configured one-to-one with the multiple second explosion-proof structures.

5. The battery pack according to claim 1, characterized in that, The cooling structure also includes multiple cooling channels, which are arranged sequentially between two second exhaust channels. Coolant circulates in each cooling channel, and the coolant in the cooling channel adjacent to the second exhaust channel can cool the gas in the corresponding second exhaust channel.

6. The battery pack according to claim 1, characterized in that, The housing is provided with side beams on both sides along the first direction. The first exhaust channel is opened in the side beam. An explosion-proof valve is sealed to the outer wall of the side beam so that the explosion-proof valve is connected to the first exhaust channel.

7. The battery pack according to claim 6, characterized in that, The housing also includes a crossbeam, with its two ends connected to the two side beams respectively. The crossbeam has two third exhaust channels, each of which is connected to a first exhaust channel and a corresponding second exhaust channel.

8. The battery pack according to claim 7, characterized in that, The crossbeam is provided with a third connecting port and a fourth connecting port on both sides along the first direction, and the third connecting port and the fourth connecting port are respectively connected to the two third exhaust channels; the side beam is provided with a fifth connecting port, the fifth connecting port is connected to the first exhaust channel, and the two fifth connecting ports are respectively sealed and connected to the third connecting port and the fourth connecting port.

9. The battery pack according to claim 7, characterized in that, The two third exhaust channels are arranged sequentially along a second direction, which is perpendicular to the first direction. The cooling structure has a first connecting portion and a second connecting portion on one side along the second direction. The first connecting portion and the second connecting portion are respectively connected to the two second exhaust channels. The dimension of the second connecting portion along the second direction is larger than the dimension of the first connecting portion along the second direction. The first connecting portion is connected to the first third exhaust channel. The second connecting portion passes through the first third exhaust channel and is connected to the second third exhaust channel.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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