Battery pack and electric device

Abstract

The present application discloses a battery pack and an electric device. The battery pack comprises a battery module and a pressure relief assembly, the pressure relief assembly is connected to the battery module, the pressure relief assembly comprises a passage, first through holes, and pressure relief members, the first through holes are configured to guide gas generated by the battery module to the passage, at least part of the passage is bent, and the pressure relief members are configured to guide gas in the passage to the outside of the battery pack. The battery pack and the electric device provided in the present application improve the battery safety.

Description

Battery pack and power consuming device

[0001] The present application claims priority to the Chinese patent application No. 202410902627.X, filed on July 5, 2024, and entitled "Battery pack and power consuming device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of electrical energy storage, and in particular to a battery pack and a power consuming device. BACKGROUND

[0003] A battery is a device that converts external energy into electrical energy and stores it inside, to supply power to external power consuming equipment when needed. As the application range of the battery becomes more and more extensive, people's demand for the use of the battery also increases. When the battery occurs thermal runaway, the violent chemical reaction inside the battery will release a large amount of heat and gas, etc., and the battery is prone to high-temperature gas flow explosion, causing safety accidents.

[0004] In view of the above, it is necessary to design a battery pack and a power consuming device to solve the above technical problems. SUMMARY

[0005] The embodiments of the present application provide a battery pack and a power consuming device, which improve the safety of the battery.

[0006] In a first aspect, the embodiments of the present application provide a battery pack, comprising: a battery module and a pressure relief assembly, the pressure relief assembly being connected to the battery module, the pressure relief assembly comprising a channel, a first through hole and a pressure relief piece, the first through hole being configured to guide the gas generated by the battery module to the channel, at least part of the channel being bent, and the pressure relief piece being configured to guide the gas in the channel out of the battery pack.

[0007] In one or more optional embodiments described above, at least part of the channel is reciprocally bent.

[0008] In one or more optional embodiments described above, the pressure relief assembly comprises a first cover body, a second cover body and a first partition piece, the first cover body and the second cover body are connected to form a first space, the first partition piece is located in the first space, and the first partition piece serves as a part of the channel; along a third direction, the battery module and the second cover body are located on opposite sides of the first cover body, and the first through hole penetrates through the first cover body.

[0009] In one or more optional embodiments described above, the first partition piece divides the first space into a plurality of channels.

[0010] In one or more optional embodiments of the above, the channel includes a first channel and a second channel, the first channel communicates the plurality of first through holes, and the second channel communicates with the first channel at one end and extends to the pressure relief member at the other end.

[0011] In one or more optional embodiments of the above, the first partition includes at least two first partition plates, the first partition plates are respectively arranged on opposite sides of the first through hole, and the first channel is located between adjacent first partition plates.

[0012] In one or more optional embodiments of the above, the second channel includes a plurality of straight segments and at least one bending segment, the bending segment connects two adjacent straight segments, and the first partition includes a second partition plate, the second partition plate being located between adjacent straight segments.

[0013] In one or more optional embodiments of the above, the second cover includes a second through hole penetrating through the second cover, and the pressure relief member covers the second through hole.

[0014] In one or more optional embodiments of the above, the battery pack includes a support member located on a side of the pressure relief member away from the first cover, the support member being connected to the second cover and protruding from the second cover.

[0015] In one or more optional embodiments of the above, the second cover includes a base and a protruding portion, the protruding portion being arranged on a side of the base away from the first cover, a height of the protruding portion protruding from the base being less than a height of the support member protruding from the base, and a melting point of the support member being less than a melting point of the protruding portion.

[0016] In one or more optional embodiments of the above, the battery module includes a plurality of cell units, each cell unit including a shell and a cell arranged in the shell, the shell including a first opening penetrating through the shell, the first opening being arranged on a side of the shell close to the first cover, and a projection of the first opening overlapping a projection of the first through hole in the third direction.

[0017] In one or more optional embodiments of the above, the pressure relief assembly includes a plurality of second partitions arranged on the first cover, the second partitions and the first partitions being arranged on opposite sides of the first cover, the second partitions being spaced between adjacent cell units, and a projection of the first through hole being located between projections of adjacent second partitions in the third direction.

[0018] In a second aspect, the embodiments of the present application provide a power utilization device, characterized in that the power utilization device includes the battery pack provided in the first aspect, and the battery pack is used to provide electric energy.

[0019] The battery pack and the electric device provided by the embodiment of the present application can protect at least two opposite sides of the battery module by setting the upper cover assembly and the pressure relief assembly; the pressure relief assembly is provided with a channel, a first through hole and a second through hole, and at least part of the channel is bent, so that the gas of the battery cell unit is discharged through the first through hole, the channel and the second through hole in sequence when the battery cell unit is in thermal runaway, so as to reduce the temperature of the gas discharged from the second through hole, thereby improving the safety of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art according to these drawings.

[0021] Fig. 1 is a perspective structural schematic view of the battery pack provided by an embodiment of the present application;

[0022] Fig. 2 is a disassembled structural schematic view of the battery pack provided by an embodiment of the present application;

[0023] Fig. 3 is a partial perspective structural schematic view of the pressure relief assembly provided by an embodiment of the present application;

[0024] Fig. 4 is a structural schematic view of the battery cell unit provided by an embodiment of the present application;

[0025] Fig. 5 is an exploded schematic view of the battery cell unit provided by an embodiment of the present application;

[0026] Fig. 6 is a structural schematic view of part of the battery pack provided by an embodiment of the present application;

[0027] Fig. 7 is an enlarged structural schematic view of part A shown in Fig. 6;

[0028] Fig. 8 is a perspective structural schematic view of the first cover provided by an embodiment of the present application;

[0029] Fig. 9 is a plan structural schematic view of the first cover provided by an embodiment of the present application;

[0030] Fig. 10 is a structural schematic view of part of the battery pack provided by an embodiment of the present application;

[0031] Fig. 11 is an enlarged structural schematic view of part B shown in Fig. 6;

[0032] Fig. 12 is a perspective structural schematic view of the first cover provided by an embodiment of the present application;

[0033] Fig. 13 is a partial sectional view of the battery pack provided by an embodiment of the present application.

[0034] The reference signs are explained as follows: 100, battery pack; 1, battery module; 11, battery cell unit; 111, shell; 112, battery cell; 1120, battery cell shell; 1121, electrode terminal; 113, first buffer; 114, second buffer; 116, first opening; 117, tab; 2, pressure relief assembly; 21, channel; 211, first channel; 212, second channel; 2121, straight section; 2122, bending section; 22, first through hole; 23, pressure relief member; 24, first cover body; 25, second cover body; 26, first partition member; 261, first partition plate; 262, second partition plate; 263, third partition plate; 27, second partition member; 28, second through hole; 29, support member; 3, circuit board; 31, bus bar; 4, bracket; 5, top cover; 51, protruding portion; 52, base portion; 6, cover plate; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0035] Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments below is merely intended to provide a better understanding of the present application by showing examples of the present application.

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.

[0037] In one aspect, the present application provides a battery. In order to better understand the technical solutions and technical effects of the present application, specific embodiments will be described in detail below with reference to the accompanying drawings.

[0038] Referring to FIGS. 1, 2 and 3, a battery pack 100 includes a battery module 1 and a pressure relief assembly 2, the pressure relief assembly 2 is connected to the battery module 1, the pressure relief assembly 2 includes a channel 21, a first through hole 22 and a pressure relief member 23, the first through hole 22 is configured to guide the gas generated by the battery module 1 to the channel 21, at least part of the channel 21 is bent, and the pressure relief member 23 is configured to guide the gas in the channel 21 out of the battery pack.

[0039] In some embodiments, the battery module 1 includes a plurality of arranged battery cell units 11, the battery cell units 11 can be arranged along a first direction X. The battery cell units 11 can be connected in series, in parallel or in a mixed manner to form an integral whole, and the integral whole is used to charge and discharge externally, wherein the mixed manner means that there are both series connection and parallel connection among the plurality of battery cell units 11.

[0040] Please refer to FIG. 4 and FIG. 5, in some embodiments, the battery cell unit 11 comprises a shell 111 and a battery cell 112 arranged in the shell 111; the shell 111 comprises a first opening 116, the first opening 116 penetrates the shell 111, and the first opening 116 is arranged on the side of the shell 111 close to the first cover 24. The projection of the first opening 116 overlaps the projection of the first through hole 22 along the third direction Z. The gas generated by the battery cell 112 flows to the first through hole 22 through the first opening 116, reducing the flow path of the gas.

[0041] One shell 111 can be provided with one or more battery cells 112, and the battery cells 112 are accommodated in the shell 111. The shell 111 can reduce the spread of gas generated by the battery cell 112 from one shell 111 to another shell 111.

[0042] The first opening 116 can be a circular through hole matching the size of the first through hole 22, or a square opening formed around the battery cell 112.

[0043] The battery cell 112 can comprise a positive electrode sheet, a negative electrode sheet and a separator. The part of the battery cell 112 with active material constitutes the positive electrode sheet and the negative electrode sheet of the battery cell 112. The battery cell 112 has electrolyte, and the positive electrode sheet, the negative electrode sheet and the separator are soaked in the electrolyte. In some embodiments, the positive electrode sheet, the negative electrode sheet and the separator are wound to form a wound structure. In other embodiments, the positive electrode sheet, the separator and the negative electrode sheet are sequentially laminated to form a laminated structure. Those skilled in the art can select a suitable battery cell 112 as needed. During the charging and discharging process of the battery cell unit 11, the positive active material and the negative active material react with the electrolyte. The positive electrode sheet and the negative electrode sheet can be connected to the electrode terminal 1121 through the tab 117 to form a current loop.

[0044] The battery cell provided in the present application can be a lithium ion secondary battery cell, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., and the embodiments of the present application are not limited thereto.

[0045] Please refer to FIG. 6 and FIG. 7, the battery cell 112 is a soft-pack battery cell, and the battery cell 112 comprises a battery cell shell 1120 and an electrode terminal 1121, the battery cell shell 1120 is located in the shell 111, and the electrode terminal 1121 extends out of the shell 111.

[0046] Please refer to FIG. 1, FIG. 2 and FIG. 3 again, the pressure relief assembly 2 comprises a channel 21, a first through hole 22 and a pressure relief piece 23. The gas generated by any battery cell 112 enters the channel 21 through the first through hole 22, and the gas is discharged from the pressure relief piece 23 through the channel 21. At least part of the channel 21 is bent, so that the bent channel 21 can provide a longer flow path for the gas in the same volume, and the gas is cooled through the channel 21 to reduce the temperature of the gas discharged from the pressure relief piece 23.

[0047] In some embodiments, the battery pack 100 comprises a circuit board 3, and the electrode terminal 1121 of the battery cell 112 is connected to the circuit board 3.

[0048] In some embodiments, the battery pack 100 comprises a bracket 4 connected to the shell 111 and a top cover 5 connected to the bracket 4.

[0049] In some embodiments, the battery pack 100 comprises a cover plate 6, and the cover plate 6 and the top cover 5 are used to realize the external insulation of the bus bar 31.

[0050] In some embodiments, at least part of the channel 21 is reciprocally bent to prolong the flow path of the gas flow in the channel 21.

[0051] In some embodiments, the pressure relief assembly 2 comprises a first cover 24, a second cover 25, and a first partition 26, the first cover 24 and the second cover 25 are connected to form a first space, and the first partition 26 is arranged in the first space, and the first partition 26 serves as a part of the channel 21.

[0052] In some embodiments, along the third direction Z, the battery module 1 and the second cover 25 are located on the opposite sides of the first cover 24, and the first through hole 22 penetrates the first cover 24. In some embodiments, the first partition 26 is connected to the first cover 24, such as welding, bonding, or screw fixing.

[0053] In some embodiments, the first partition 26 is connected to the second cover 25, such as welding, bonding, or screw fixing. The first partition 26 and the second cover 25 form the channel 21.

[0054] Please refer to FIG. 3, the first partition 26 is connected to the second cover 25, and the first partition 26 and the second cover 25 are integrally formed. For example, by injection molding.

[0055] Those skilled in the art can set the first partition 26 with different shapes at different positions in the first space as needed to form the channel 21 with the required path.

[0056] In some embodiments, the first partition 26 divides the first space into multiple channels 21.

[0057] The first partition 26 can be a plate standing along the third direction Z, and the first space is divided into multiple channels by the first partition 26, thereby improving the space occupation of the channels in the unit area and improving the utilization rate of the first space. The first space can be divided into channels 21 with the required path by one or more first partitions 26 to prolong the length of the flow path of the gas generated by the battery cell unit 11 in the channel 21.

[0058] Please refer to FIG. 8 and FIG. 9, in some embodiments, the channel 21 comprises a first channel 211 and a second channel 212, the first channel 211 is in communication with the first through hole 22, one end of the second channel 212 is in communication with the first channel 211, and the other end extends to the pressure relief member 23.

[0059] The first channel 211 can extend along the first direction X and be in communication with the plurality of first through holes 22, and the gas discharged from each first through hole 22 can enter the first channel 211 and then be discharged through the second channel 212 and the pressure relief member 23, so as to prolong the flow path from the first through hole 22 to the pressure relief member 23 and reduce the temperature of the gas discharged from the pressure relief member 23.

[0060] In some embodiments, the first partition 26 comprises at least two first partition plates 261, the first partition plates 261 are arranged on opposite sides of the first through hole 22, and the first channel 211 is located between adjacent first partition plates 261.

[0061] The first partition plate 261 can have a gap in communication with the second channel 212, and the gas can enter the second channel 212 from the first channel 211 through the gap. Optionally, the gap is formed in the middle of the first partition plate 261, that is, the path from the first through hole 22 located at the ends of the plurality of first through holes 22 to the gap is the longest, and the path from the first through hole 22 located in the middle of the plurality of first through holes 22 to the gap is the shortest.

[0062] In some embodiments, the second channel 212 comprises a plurality of straight segments 2121 and at least one bending segment 2122, the bending segment 2122 connects two adjacent straight segments 2121, and the first partition 26 comprises a second partition plate 262, the second partition plate 262 is located between adjacent straight segments 2121.

[0063] The second partition plate 262 can extend along the first direction X, and one second partition plate 262 can divide the space into two straight segments 2121, and a plurality of straight segments 2121 can be arranged at intervals along the second direction Y. The end of the second partition plate 262 is arranged at intervals with the side wall of the first cover 24 or with other partition plates except the first and second partition plates, and surrounds to form the bending segment 2122 connecting the two straight segments 2121. The gas flow from the first through hole 22 first flows along the first channel 211, enters the second channel 212 at the gap, and then flows along the alternating straight segments 2121 and bending segments 2122 to the pressure relief member 23 and flows out.

[0064] By arranging a plurality of straight segments 2121 and at least one bending segment 2122, the path length of the gas flow in the second channel 212 is increased.

[0065] In some embodiments, the first partition 26 comprises a third partition plate 263 extending along the second direction Y, one end of the third partition plate 263 is connected with the second partition plate 262, and the other end is connected with the side wall of the first cover 24, and the third partition plate 263 separates the two bending sections 2122 of the second channel 212.

[0066] As shown in FIG. 9, the pressure relief assembly 2 comprises two first channels 211 and four second channels 212, which are beneficial to improve the pressure relief speed of the battery pack 100.

[0067] Referring to FIGS. 10, 11 and 12, in some embodiments, the second cover 25 comprises a second through hole 28 penetrating the second cover 25, and the pressure relief member 23 covers the second through hole 28. Optionally, the pressure relief member 23 is located on the side of the second cover 25 away from the first cover 24.

[0068] The first through hole 22 is arranged on the first cover 24, and the second through hole 28 is arranged on the second cover 25. The gas generated by the battery cell 112 can be introduced into the channel 21 and flow along the channel 21 to the pressure relief member 23, and the gas can break through the pressure relief member 23 and be discharged to the outside environment.

[0069] In some embodiments, a plurality of second through holes 28 are arranged at intervals, and the second through holes 28 are arranged on the edge of the second cover 25.

[0070] When the battery pack 100 is placed in an electronic device or on a mounting surface, arranging the second through hole 28 on the edge of the pressure relief assembly 2 is beneficial to the flow of the gas through the second through hole 28 and the discharge of the gas to the outside of the battery.

[0071] For example, the first cover 24 is a cuboid, and four second through holes 28 are arranged at four corners of the first cover 24, respectively.

[0072] In some embodiments, the pressure relief member 23 comprises a pressure relief valve. When the gas generated by the battery cell 112 is introduced into the channel 21, the gas pressure in the channel 21 is increased, the valve of the pressure relief valve is opened, and the gas is released outward. The pressure relief valve can be a one-way valve or a two-way valve.

[0073] In some embodiments, the pressure relief member 23 comprises a waterproof and breathable film, which can block liquid and pass gas. When the gas generated by the battery cell 112 is introduced into the channel 21, the gas in the channel 21 is discharged through the waterproof and breathable film.

[0074] Referring to FIG. 11, in some embodiments, the battery pack 100 comprises a support 29 located on the side of the pressure relief member 23 away from the first cover 24, and the support 29 is connected to and protrudes from the second cover 25. This is beneficial to protect the pressure relief member 23.

[0075] Please refer to FIG. 12 and FIG. 13, in some embodiments, the second cover 25 comprises a base 52 and a protrusion 51, the protrusion 51 is arranged on the side of the base 52 away from the first cover 24, the height H2 of the protrusion 51 protruding from the base 52 is less than the height H1 of the support 29 protruding from the base 52, and the melting point of the support 29 is less than the melting point of the protrusion 51.

[0076] The support 29 can be a cuboid, the protrusion 51 can enclose a rectangle matching the size of the support 29, and the support 29 is limited in the protrusion 51, so that the support 29 is stably connected with the second cover 25. The height H2 of the protrusion 51 protruding from the base 52 is less than the height H1 of the support 29 protruding from the base 52, so that when the battery is placed on a plane, the support 29 and the protrusion 51 preferentially contact the plane. By arranging the support 29, the battery pack 100 is stably placed, and the vibration of the battery caused by external force is reduced. The melting point of the support 29 is less than the melting point of the protrusion 51, so that after the support 29 melts, the protrusion 51 can support the battery pack 100 to be stably placed, and it is beneficial to the high-temperature gas rushing out through the support 29.

[0077] In some embodiments, the pressure relief assembly 2 comprises a second partition 27 arranged on the first cover 24, the second partition 27 and the first partition 26 are arranged on opposite sides of the first cover 24, the second partition 27 is spaced between adjacent cell units 11, and the projection of the first through hole 22 is located between the projections of adjacent second partitions 27 along the third direction Z.

[0078] The second partition 27 can limit the adjacent cell units 11 and limit the mutual movement of the adjacent cell units 11. The second partition 27 can be spaced between the adjacent cell units 11 to reduce the contact between the adjacent cell units 11. Along the third direction Z, the projection of the first through hole 22 is located between the projections of adjacent second partitions 27, which is beneficial to the first through hole 22 being in communication with the cell units 11 limited between the second partitions 27.

[0079] In some embodiments, the cell unit 11 comprises a first buffer 113 arranged in the shell 111, and the first buffer 113 seals the side of the cell 112 close to the first cover 24.

[0080] The first buffer 113 can comprise foam and sealing glue, and the sealing glue is filled in the foam. The first buffer 113 can protect the cell 112 from external damage on one hand, and can seal the cell 112 in the shell 111 on the other hand. The high-temperature gas flow generated by the cell 112 rushes through the first buffer 113 and flows into the channel 21 from the first through hole 22.

[0081] The shell 111 can be open at both ends, and the end of the shell 111 close to the pressure relief assembly 2 is sealed by the first buffer 113, and the end of the shell 111 close to the top cover 5 can be sealed by pouring sealant, so that the battery cell 112 is sealed in the shell 111.

[0082] In some embodiments, the battery cell unit 11 includes a plurality of battery cells 112, and the plurality of battery cells 112 in the battery cell unit 11 are arranged at intervals along the first direction X, and the battery cell unit 11 includes a second buffer 114, and the second buffer 114 is arranged between adjacent battery cells 112 along the first direction X.

[0083] The second buffer 114 can be foam. The second buffer 114 can avoid or reduce the collision between adjacent battery cells 112.

[0084] For example, one battery cell unit 11 includes two battery cells 112 arranged at intervals along the first direction X, and two second buffers 114 are arranged at intervals between the two battery cells 112 along the first direction X, and the two second buffers 114 are arranged at intervals along the second direction Y. The first direction X and the second direction Y are perpendicular.

[0085] In a second aspect, the present application provides a power utilization device, which includes the battery provided in the first aspect, and the battery is used to provide electric energy.

[0086] The specific product types of the power utilization device include but are not limited to mobile terminals, smart wear, electric tools, electric vehicles, mobile power sources, aircraft, etc.

[0087] Since the battery has the aforementioned beneficial effects, the power utilization device has high safety and reliability, and long service life.

[0088] In addition, the term "and / or" in this paper is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents an "or" relationship between the front and rear associated objects.

[0089] It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should be understood that the determination of B according to A does not mean that B is determined only according to A, but B can be determined according to A and / or other information.

[0090] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery pack characterized by comprising: The application relates to a battery module and a pressure relief assembly. The battery module comprises a battery module and a pressure relief assembly connected to the battery module, the pressure relief assembly comprising a channel, a first through hole configured to guide gas generated by the battery module to the channel, at least part of the channel being bent, and a pressure relief member configured to guide the gas in the channel to the outside of the battery module. At least part of the channel is reciprocally bent.

2. The battery pack of claim 1, wherein, The pressure relief assembly comprises a first cover, a second cover and a first partition, the first cover and the second cover being connected to form a first space, 3. The battery pack according to claim 1 or 2, characterized by, The first partition is located in the first space and serves as a component forming the channel. In a third direction, the battery module and the second cover are located on opposite sides of the first cover, and the first through hole penetrates the first cover. The first partition divides the first space into a plurality of channels.

4. The battery pack of claim 3, wherein, The channel comprises a first channel and a second channel, the first channel being in communication with the first through hole, and one end of the second channel being in communication with the first channel and the other end extending to the pressure relief member.

5. The battery pack according to claim 3 or 4, characterized by The first partition comprises at least two first partition plates, the first partition plates being arranged on opposite sides of the first through hole, and the first channel being located between adjacent first partition plates.

6. The battery pack of claim 5, wherein, The second channel comprises a plurality of straight segments and at least one bent segment, the bent segment connecting two adjacent straight segments, 7. The battery pack of claim 6, wherein, The first partition comprises a second partition plate, the second partition plate being located between adjacent straight segments. The first partition comprises a third partition plate extending in a second direction, one end of the third partition plate being connected to the second partition plate and the other end being connected to a side wall of the first cover, and the third partition plate dividing two bent segments of the second channel.

8. The battery pack of claim 7, wherein, The second cover comprises a second through hole penetrating the second cover, and the pressure relief member covers the second through hole.

9. The battery pack according to any one of claims 3 to 8, characterized by, The battery module comprises a support member located on a side of the pressure relief member away from the first cover, the support member being connected to and protruding from the second cover.

10. The battery pack according to any one of claims 3 to 9, characterized by, The second cover comprises a base and a protruding portion, the protruding portion being arranged on a side of the base away from the first cover, and the height of the protruding portion protruding from the base being less than the height of the support member protruding from the base.

11. The battery pack of claim 10, wherein, The melting point of the support member is less than the melting point of the protruding portion. The battery module comprises a plurality of cell units, each cell unit comprising a shell and a cell arranged in the shell.

12. The battery pack according to any one of claims 3 to 11, characterized by The shell comprises a first opening penetrating the shell, the first opening being arranged on a side of the shell close to the first cover. In the third direction, the projection of the first opening overlaps the projection of the first through hole. The pressure relief assembly comprises a plurality of second partitions arranged on the first cover, the second partitions and the first partition being arranged on opposite sides of the first cover, and the second partitions being spaced between adjacent cell units, 13. The battery pack of claim 12, wherein, In the third direction, the projection of the first through hole is located between the projections of adjacent second partitions. ​ 14. The battery pack according to claim 12 or 13, characterized by The electric core is a soft package electric core, the electric core comprises an electric core shell and an electrode terminal, the electric core shell is located in the shell, and the electrode terminal extends out of the shell.

15. The battery pack according to any one of claims 12 to 14, characterized by, The electric core unit comprises a first buffer, the first buffer is arranged in the shell, and the first buffer seals one side of the electric core close to the first cover.

16. The battery pack according to any one of claims 3 to 15, characterized by, The first partition and the second cover are integrally formed.

17. The battery pack according to any one of claims 1 to 16, characterized by, The pressure relief member comprises a waterproof and breathable film.

18. The battery pack according to any one of claims 1 to 16, characterized by, The pressure relief member comprises a pressure relief valve.

19. An electrical device, comprising: A battery pack comprising the battery pack according to any one of claims 1 to 18, the battery pack being used for providing electric energy.

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