Battery pack and electric equipment thereof

Abstract

The utility model discloses a battery pack and electric equipment thereof, the battery pack comprises a box body, a battery pack and a pressure relief piece, and the box body is internally provided with an accommodating cavity; the battery pack is arranged in the accommodating cavity and comprises a plurality of single batteries, and each single battery is provided with an anti-explosion valve; the pressure relief part is arranged in the containing cavity, the pressure relief part is provided with a plurality of cavities which are not communicated with one another, the pressure relief part is further provided with inlets and outlets which are communicated with the cavities, each inlet is opposite to one anti-explosion valve, and the outlets are communicated with the outside of the box body. According to the technical scheme provided by the invention, the technical problem that a heat diffusion risk exists when the pressure relief channel in the battery pack is communicated can be solved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery pack and an electrical device using the same. Background Art

[0002] A battery pack generally includes multiple single cells, and an explosion-proof valve is provided on each single cell. When a single cell undergoes thermal runaway, the explosion-proof valve of the single cell opens and high-temperature gas is ejected. If the high-temperature gas is not discharged outside the battery pack in time, a large amount of heat remaining will cause other normal single cells in the battery pack to also be thermally shocked, which may lead to thermal diffusion throughout the battery pack, and then cause the explosion or fire of the battery pack. Although some current battery packs also design a pressure relief channel to conduct the high-temperature gas released by the single cell and relieve pressure to the outside of the battery pack, the pressure relief channel generally adopts a connected setting, that is, all single cells are conducted and relieved pressure through one pressure relief channel. This results in that if one or several single cells undergo thermal runaway, the high-temperature gas ejected from the single cell will spread to other single cells through the pressure relief channel, and there is still a risk of thermal diffusion. Moreover, as the number of single cells in the battery pack increases day by day, the above problems existing in the traditional pressure relief channel design become more and more obvious. Summary of the Utility Model

[0003] This application provides a battery pack and an electrical device using the same to solve the technical problem of the risk of thermal diffusion when the pressure relief channels in the battery pack are connected.

[0004] The battery pack according to the embodiment of this application includes:

[0005] A box body, in which a receiving cavity is provided;

[0006] A battery pack, which is arranged in the receiving cavity. The battery pack includes multiple single cells, and each single cell has an explosion-proof valve;

[0007] A pressure relief member, which is arranged in the receiving cavity. The pressure relief member is provided with multiple chambers that are not connected to each other. The pressure relief member is further provided with an inlet and an outlet that are respectively connected to the chambers. Each inlet is disposed opposite to an explosion-proof valve, and the outlet is configured to be connected to the outside of the box body when the explosion-proof valve opens.

[0008] Optionally, the pressure relief member is located on one side of the single cell, the explosion-proof valve faces the pressure relief member, and the pressure relief member is hermetically connected to the single cell.

[0009] Optionally, the battery pack further includes a sealing member. A sealing groove is provided on the side of the pressure relief member facing the single cell, the sealing groove is annularly arranged around the periphery of the inlet, and the sealing member is arranged in the sealing groove and is hermetically connected to the single cell.

[0010] Optionally, the battery pack has a first direction and a second direction that intersect. The plurality of single cells of the battery pack are distributed along the first direction. The pressure relief member is located on one side of the battery pack in the second direction. A plurality of protrusions protrude from the side of the pressure relief member facing the single cells, and the protrusions are located on both sides of the single cells in the first direction.

[0011] Optionally, the pressure relief member is provided with a pressure relief cavity. The pressure relief member is provided with a plurality of inlets communicating with the pressure relief cavity. A plurality of partitions connected to the pressure relief member are provided in the pressure relief cavity. The plurality of partitions divide the pressure relief cavity into a plurality of chambers. Each chamber communicates with one or more inlets and each chamber communicates with one or more outlets.

[0012] Optionally, the box body is provided with a perforation. The battery pack further includes an extension member connected to the pressure relief member. The extension member passes through the perforation. The extension member is provided with a cavity channel. The cavity channel communicates with the outlet. The extension member is provided with an opening communicating with the cavity channel. The cavity channel communicates with the outside of the box body through the opening.

[0013] Optionally, the battery pack further includes a pressure relief valve. The pressure relief valve is disposed at the perforation or the opening, and the pressure relief valve is configured to close the opening.

[0014] Optionally, the box body has an inner bottom wall and an inner side wall surrounding the outer periphery of the inner bottom wall. The inner bottom wall and the inner side wall cooperate to enclose an accommodation cavity. The pressure relief member is disposed on the inner bottom wall. The single cells are disposed on the side of the pressure relief member away from the inner bottom wall. The outlet is opened at a portion of the pressure relief member close to the inner bottom wall.

[0015] Optionally, the box body has an inner bottom wall and an inner side wall surrounding the outer periphery of the inner bottom wall. The inner bottom wall and the inner side wall cooperate to enclose an accommodation cavity. The battery pack further includes a fixing member. The fixing member is disposed between the single cells and the inner bottom wall. The fixing member is respectively connected to the single cells and the box body.

[0016] The electrical device of the embodiment of the present application includes the above battery pack.

[0017] The battery pack of the present application has at least the following beneficial effects:

[0018] The battery pack of the present application is provided with a pressure relief member. The pressure relief member is provided with a plurality of non-communicating chambers. The plurality of single cells of the battery pack are respectively exhausted and pressure-relieved through the plurality of chambers in the pressure relief member, which can achieve thermal separation, reduce the internal pressure of the entire battery pack and reduce the risk of thermal diffusion in the battery pack, and can effectively enhance the thermal safety of the battery pack.

[0019] The electrical device of the present application may include all the technical features and beneficial effects of the above battery pack, which will not be elaborated herein. Description of the Drawings

[0020] The following will make the technical solutions and other beneficial effects of the present application obvious by describing the specific embodiments of the present application in detail in conjunction with the drawings.

[0021] Figure 1 And Figure 2 are respectively schematic three - dimensional structure diagrams of the battery pack provided by the embodiments of the present application;

[0022] Figure 3 is an exploded structure diagram of the battery pack provided by the embodiments of the present application;

[0023] Figure 4 is a top - view structure diagram of the battery pack provided by the embodiments of the present application when only part of the monomer batteries are provided;

[0024] Figure 5 is Figure 4 a cross - sectional structure diagram of the structure shown at position A;

[0025] Figure 6 is Figure 5 an enlarged diagram of the structure shown at position I;

[0026] Figure 7 is a schematic three - dimensional structure diagram of the pressure - relief member provided by the embodiments of the present application;

[0027] Figure 8 is Figure 7 an enlarged diagram of the structure shown at position II.

[0028] Reference numerals: 1 - box body, 11 - accommodation cavity, 12 - perforation, 13 - inner bottom wall, 14 - inner side wall, 2 - battery pack, 21 - monomer battery, 211 - explosion - proof valve, 3 - pressure - relief member, 31 - pressure - relief cavity, 311 - chamber, 312 - partition, 32 - inlet, 33 - outlet, 34 - sealing groove, 35 - protruding part, 4 - seal, 5 - extension member, 51 - cavity, 52 - opening, 6 - pressure - relief valve, 7 - fixing member, X - first direction, Z - second direction, Y - third direction. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the term "and / or" in this article is only a correlation relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after without special explanation. 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 indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0031] Please refer to Figure 1 and Figure 3 As shown in and, the battery pack of the embodiment of the present application includes a box body 1, a battery pack 2 and a pressure relief member 3. An accommodation cavity 11 is provided in the box body 1. The box body 1 has an inner bottom wall 13 and an inner side wall 14 surrounding the outer periphery of the inner bottom wall 13. The accommodation cavity 11 is formed by the cooperation of the inner bottom wall 13 and the inner side wall 14. The battery pack 2 is arranged in the accommodation cavity 11. The battery pack 2 includes a plurality of single cells 21, and each single cell 21 has an explosion-proof valve 211. The pressure relief member 3 is arranged in the accommodation cavity 11. Specifically, the pressure relief member 3 is arranged on the inner bottom wall 13. The pressure relief member 3 is provided with a plurality of chambers 311 that are not communicated with each other. The pressure relief member 3 is further provided with an inlet 32 and an outlet 33 that are respectively communicated with the chambers 311. Each inlet 32 is arranged opposite to an explosion-proof valve 211, and each outlet 33 is arranged on the part of the pressure relief member 3 close to the inner bottom wall 13. When the explosion-proof valve 211 is opened, the outlet 33 is communicated with the outside of the box body 1. It should be noted that in the present application, the fact that the plurality of chambers 311 are not communicated with each other means that in addition to being able to communicate with the outside of the battery pack, the chambers 311 are independent of each other and not communicated.

[0032] By providing the pressure relief member 3 in the battery pack of the embodiment of the present application, and a plurality of non-communicating chambers 311 are provided in the pressure relief member 3, so that the plurality of single cells 21 of the battery pack can exhaust and relieve pressure respectively through the plurality of chambers 311 in the pressure relief member 3, thereby realizing thermal separation, reducing the internal pressure of the entire battery pack and reducing the risk of thermal diffusion in the battery pack, and effectively enhancing the thermal safety of the battery pack.

[0033] Next, take the Figures 1 to 3 embodiment schematically shown as an example to further illustrate the technical solution. To describe the technical solution more clearly, define as Figure 1The first direction X, the second direction Z, and the third direction Y of the intersecting setting shown, preferably, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. It can be understood that the first direction X, the second direction Y, and the third direction Z are not absolutely perpendicular and can form a certain angle. For example, the angle between two intersecting directions is between 85° and 95°.

[0034] Please refer to Figure 1 and Figure 3 , in some embodiments, a total of three battery packs 2 and three pressure relief components 3 are provided in the box body 1. The three battery packs 2 are distributed along the third direction Y, and each battery pack 2 includes thirty single cells 21 distributed along the first direction X. The pole columns of the single cells 21 are located on both sides of the single cells 21 in the third direction Y, and the explosion-proof valves 211 are located at the bottoms of the single cells 21. The pressure relief component 3 is located on one side of the battery pack 2 in the second direction Z, that is, the pressure relief component 3 is located between the battery pack 2 and the inner bottom wall 13 of the box body 1.

[0035] Of course, the above is only one embodiment. In other embodiments, the single cell 21 can be a short blade battery, and it can also be other battery structures such as cylindrical batteries. The number of the battery packs 2 is not limited either. It can be one, two, or other multiple numbers. The arrangement manner of the battery packs 2 is not limited to the above one, and can be specifically set according to needs. For example, multiple battery packs 2 can also be distributed along the first direction X, etc. The number of the pressure relief components 3 is not limited either. It can be that one pressure relief component 3 corresponds to one battery pack 2, or one pressure relief component 3 corresponds to multiple battery packs 2, or multiple battery packs 2 correspond to one pressure relief component 3, etc. For example, multiple pressure relief components 3 distributed along the first direction X can be provided on one side of the battery pack 2, etc. The spatial position between the pressure relief component 3 and the battery pack 2 is not limited either. The specific setting position of the pressure relief component 3 can be matched according to the specific position of the explosion-proof valve 211 on the single cell 21. For example, in an embodiment where the explosion-proof valve 211 is located on one side of the single cell 21 in the third direction Y, the pressure relief component 3 can also be provided on one side of the battery pack 2 in the third direction Y. Since the single cell 21 can adopt the existing structure, and the connection structure between the single cells 21 can also be realized by the existing technology, the specific structure of the single cell 21 and the connection manner between the single cells 21 will not be elaborated in this embodiment.

[0036] In some embodiments, the single cell 21 can be fixedly connected to the inner bottom wall 13 through the fixing member 7. For example Figure 3 in the embodiment schematically shown, the fixing member 7 is arranged between the single cell 21 and the inner bottom wall 13. The fixing member 7 can be fixedly connected to the single cell 21 and the box body 1 respectively by welding or bonding, etc., so as to realize the fixation of the single cell 21 in the box body 1. The number of the fixing members 7 is not limited. For example Figure 3As shown in the figure, a fixing member 7 can be respectively arranged at two shoulder parts of the single battery 21 for fixing. The accommodating space formed between the two fixing members 7 can be used to accommodate the pressure relief member 3, such as Figure 4 shown.

[0037] In some embodiments, two fixing members 7 arranged at intervals along the third direction Y can also be arranged in the middle of the single battery 21, such as Figure 3 shown. The interval between the two fixing members 7 can be matched with the pressure relief member 3. On the one hand, the connection stability between the single battery 21 and the box body 1 can be increased. On the other hand, the pressure relief member 3 can be limited in the third direction Y to ensure that the pressure relief member 3 will not have relative displacement relative to the box body 1 in the third direction Y during subsequent use. Of course, in other embodiments, the pressure relief member 3 can also be fixedly connected to the box body 1 by welding, gluing or other means.

[0038] The pressure relief member 3 is in a strip shape, and its two ends extend along the first direction X. A pressure relief cavity 31 is arranged in the pressure relief member 3. On the side of the pressure relief member 3 facing the battery pack 2, a plurality of inlets 32 distributed along the first direction X and communicated with the pressure relief cavity 31 are arranged. The plurality of inlets 32 are arranged in one-to-one correspondence with the explosion-proof valves 211 of the plurality of single batteries 21 in each battery pack 2, such as Figures 4 to 6 shown. A plurality of partition plates 312 connected to the pressure relief member 3 are arranged in the pressure relief cavity 31. The plurality of partition plates 312 divide the pressure relief cavity 31 into a plurality of chambers 311. Each chamber 311 is correspondingly communicated with one or more inlets 32, and each chamber 311 is communicated with one or more outlets 33. For example Figure 5 In the embodiment schematically shown in the figure, two partition plates 312 arranged at intervals along the first direction X are arranged in the pressure relief cavity 31. The two partition plates 312 divide the pressure relief cavity 31 into three chambers 311. Each chamber 311 is correspondingly communicated with ten inlets 32. Of course, the above is only one embodiment. In other embodiments, the number of the partition plates 312 and the number of the inlets 32 correspondingly communicated with each chamber 311 are not limited. For example, in some embodiments, the number of the partition plates 312 can be set to divide the pressure relief cavity 31 into chambers 311 with the same number as the inlets 32, and each chamber 311 is only correspondingly communicated with one inlet 32; for another example, in some embodiments, the number of the partition plates 312 can also be set to divide the pressure relief cavity 31 into a plurality of chambers 311, wherein some chambers 311 are respectively only correspondingly communicated with one inlet 32 one by one, while other chambers 311 are respectively correspondingly communicated with a plurality of inlets 32.

[0039] In some embodiments, the pressure relief member 3 is hermetically connected to the single battery 21. For example Figure 6In the embodiment schematically shown, a sealing groove 34 may be provided on the side of the pressure relief member 3 facing the single cell 21, and the sealing groove 34 is annularly arranged around the inlet 32. A sealing member 4 is arranged in the sealing groove 34, and the sealing member 4 is sealingly connected to the single cell 21. The sealing member 4 may be a sealant or other sealing members 4 such as a sealing ring. In the embodiment where a sealing ring is used as the sealing member 4, the sealing ring protrudes from the outer wall of the pressure relief member 3. Thus, when the single cell 21 abuts against the pressure relief member 3, the sealing ring will be squeezed and deformed, thereby achieving sealing between the single cell 21 and the pressure relief member 3. In the embodiment where a sealant is used as the sealing member 4, the sealant is filled in the sealing groove 34 with interference fit. Thus, when the single cell 21 abuts against the pressure relief member 3, better sealing between the two can be achieved. Using a sealant to seal between the single cell 21 and the pressure relief member 3, the sealant can also play a connecting role, which is beneficial to enhancing the connection stability between the single cell 21 and the pressure relief member 3 and can improve the overall fixing strength of the battery pack 2.

[0040] It can be understood that in some embodiments, the sealing groove 34 may not be provided on the side of the pressure relief member 3 facing the single cell 21, and the sealing member 4 may be directly fixed on the side of the pressure relief member 3 facing the single cell 21, and the sealing member 4 is sealingly connected to the single cell 21. The sealing member 4 may also be directly fixed on the side of the single cell 21 facing the pressure relief member 3, and the sealing member 4 may be a sealant, a sealing gasket or a sealing ring, etc.

[0041] In some embodiments, a plurality of protruding portions 35 may also be convexly provided on the side of the pressure relief member 3 facing the single cell 21, and the protruding portions 35 are located on both sides of the single cell 21 in the first direction X. For example Figure 7 and Figure 8 In the embodiment schematically shown, the protruding portion 35 is strip-shaped and extends along the third direction Y. The protruding portion 35 can play a positioning role, enabling the single cell 21 to be more easily and accurately installed at the set position during assembly, so that its explosion-proof valve 211 is accurately aligned with the corresponding inlet 32 on the pressure relief member 3. In some embodiments, the protruding portion 35 and the single cell 21 may be connected by means such as gluing. With such a design, on the one hand, the connection between the single cell 21 and the pressure relief member 3 can be made more reliable, further improving the overall fixing strength of the battery pack 2, and on the other hand, it can also play a certain sealing role and improve the sealing performance between the single cell 21 and the pressure relief member 3. Of course, the above is only one of the embodiments, and the shape of the protruding portion 35 is not limited to the above one. In other embodiments, the protruding portion 35 may also be other shapes, such as cylindrical. And the protruding portions 35 on the same side of the single cell 21 are not limited to one, and may also be a plurality distributed along the third direction Y.

[0042] The pressure relief member 3 is provided with a plurality of outlets 33 distributed along the first direction X and connected to the pressure relief chamber 31. Each chamber 311 is connected to one or more outlets 33. Figure 5 In the embodiment schematically shown in the figure, each chamber 311 is connected to three outlets 33 respectively. Of course, the above is only one embodiment. In other embodiments, the number of outlets 33 connected to each chamber 311 is not limited and can be any number. For example, in some embodiments, each chamber 311 can be connected to only one outlet 33; or some chambers 311 can be connected to only one outlet 33 one by one, while other chambers 311 can be connected to multiple outlets 33 respectively. Preferably, each chamber 311 is connected to multiple outlets 33 respectively. Such a design can improve the efficiency of discharging high-temperature gas in the chamber 311 when thermal runaway occurs in the single cell 21.

[0043] In some embodiments, the box body 1 is provided with a perforation 12, such as Figure 4 The battery pack further includes an extension member 5, which is disposed at one end of the pressure relief member 3 facing the through hole 12 and connected to the pressure relief member 3, and extends from the pressure relief member 3 to the direction where the through hole 12 is located. The extension member 5 is disposed in the through hole 12, as shown in FIG. Figure 5 and Figure 6 With such a design, the radial limiting of the extension member 5 by the box body 1 can be used to further limit the pressure relief member 3, which can further improve the installation stability of the pressure relief member 3.

[0044] The extension piece 5 is provided with a cavity 51, and the cavity 51 is communicated with the outlet 33. The extension piece 5 is provided with an opening 52 communicated with the cavity 51, and the cavity 51 is communicated with the outside of the box body 1 through the opening 52. Figure 5 Schematically shows an embodiment, the extension member 5 is tubular, one end of which is connected to the extension member 5, and the other end is inserted into the through hole 12, so that the opening 52 of the extension member 5 away from the outlet 33 is connected to the outside of the box body 1. In this embodiment, the extension member 5 can be integrally formed with the pressure relief member 3, or it can be an independent component, and then fixedly connected to the pressure relief member 3 by gluing or welding.

[0045] The outlet 33 is closed by the pressure relief valve 6. In some embodiments, the pressure relief valve 6 can be disposed at the through hole 12 of the box body 1, or at the opening 52 of the extension member 5. Figure 5 and Figure 6In the embodiment schematically shown, the pressure relief valve 6 has a piston structure. The plug portion of the pressure relief valve 6 is inserted into the opening 52 of the extension member 5, and the valve cap of the pressure relief valve 6 abuts against the outer wall of the box body 1, so as to realize the closing of the opening 52 by the pressure relief valve 6. When the extension length of the extension member 5 is less than the depth of the perforation 12, the plug portion of the pressure relief valve 6 is inserted into the perforation 12, and the end of the plug portion away from the valve cap is opposite to the end of the extension member 5 away from the pressure relief member 3. At this time, the pressure relief valve 6 plugs the perforation 12 and realizes the closing of the opening 52. When one or some of the single cells 21 have a thermal runaway and the pressure in the chamber 311 is higher than a certain range, the pressure relief valve 6 will be pushed out and no longer close the outlet 33. After that, the high-temperature gas in the chamber 311 can be discharged out of the battery pack through the outlet 33 and the channel 51 of the extension member 5 to form pressure relief. Of course, the specific structure of the pressure relief valve 6 is not limited to the above one. In other embodiments, the pressure relief valve 6 can also be other valve body structures. For example, some pressure relief valves 6 have a threaded structure, and the pressure relief valve 6 and the extension member 5 can be designed to be threadedly connected. Such a design can fix the pressure relief member 3 and the box body 1 while closing the outlet 33. Since the pressure relief valve 6 is a conventional structure and the installation method of the pressure relief valve 6 can also be realized by the prior art, the specific structure and installation method of the pressure relief valve 6 will not be elaborated in this embodiment.

[0046] Through the above design, when one or some of the single cells 21 in the battery pack have a thermal runaway, the high-temperature gas generated by the thermal runaway will enter the corresponding chamber 311, and then be discharged out of the battery pack through the pressure relief valve 6 provided at the outlet 33 of the chamber 311. Since the chambers 311 in the pressure relief member 3 are independent of each other, the high-temperature gas generated by the thermally runaway single cell 21 will not spread along the pressure relief member 3 to the single cells 21 corresponding to other chambers 311, thus effectively realizing thermal separation, effectively reducing the internal pressure of the entire battery pack and reducing the risk of thermal diffusion in the battery pack, and greatly enhancing the thermal safety of the battery pack.

[0047] On the other hand, the present application also includes an electrical device including any one of the above battery packs.

[0048] As mentioned above, only some embodiments of the present application are described, and there is no limitation in any form to this application. The protection scope of the embodiments of the present application is not limited thereto. Any simple modifications, equivalent changes and decorations that can be easily thought of by those skilled in the art within the technical scope disclosed by the embodiments of the present application should be covered within the protection scope of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: The battery pack comprises: A box body (1), wherein a receiving chamber (11) is provided in the box body (1); A battery pack (2), the battery pack (2) being arranged in the accommodating chamber (11), the battery pack (2) comprising a plurality of single cells (21), each of the single cells (21) having an explosion-proof valve (211); A pressure relief component (3), the pressure relief component (3) being arranged in the accommodating chamber (11), the pressure relief component (3) being provided with a plurality of chambers (311), the plurality of chambers (311) being not connected to each other; the pressure relief component (3) being further provided with an inlet (32) and an outlet (33) respectively connected to the chambers (311), each of the inlets (32) being arranged opposite to one of the explosion-proof valves (211), and the outlet (33) being configured to be connected to the outside of the box body (1) when the explosion-proof valve (211) is opened.

2. The battery pack according to claim 1, characterized in that: The pressure relief component (3) is located on one side of the single battery (21), the explosion-proof valve (211) faces the pressure relief component (3), and the pressure relief component (3) and the single battery (21) are sealed and connected.

3. The battery pack according to claim 2, characterized in that: The battery pack further comprises a sealing member (4); a sealing groove (34) is provided on the side of the pressure relief member (3) facing the single battery (21); the sealing groove (34) is arranged around the periphery of the inlet (32); and the sealing member (4) is arranged in the sealing groove (34) and is sealedly connected to the single battery (21).

4. The battery pack according to claim 1, characterized in that: The battery pack has a first direction (X) and a second direction (Z) that are arranged to intersect each other. The plurality of single cells (21) of the battery pack (2) are distributed along the first direction (X). The pressure relief member (3) is located on one side of the battery pack (2) in the second direction (Z). The pressure relief member (3) is provided with a plurality of protrusions (35) on one side facing the single cells (21). The protrusions (35) are located on both sides of the single cells (21) in the first direction (X).

5. The battery pack according to claim 1, characterized in that: The pressure relief component (3) is provided with a pressure relief chamber (31), the pressure relief component (3) is provided with a plurality of inlets (32) connected to the pressure relief chamber (31), a plurality of partitions (312) connected to the pressure relief component (3) are provided in the pressure relief chamber (31), the plurality of partitions (312) divide the pressure relief chamber (31) into a plurality of chambers (311), each of the chambers (311) is connected to one or more of the inlets (32), and each of the chambers (311) is connected to one or more of the outlets (33).

6. The battery pack according to claim 1, characterized in that: The box body (1) is provided with a through hole (12), and the battery pack further comprises an extension piece (5), wherein the extension piece (5) is arranged at one end of the pressure relief piece (3) facing the through hole (12) and connected to the pressure relief piece (3), the extension piece (5) is passed through the through hole (12), the extension piece (5) is provided with a cavity (51), the cavity (51) is communicated with the outlet (33), the extension piece (5) is provided with an opening (52) communicated with the cavity (51), and the cavity (51) is communicated with the outside of the box body (1) through the opening (52).

7. The battery pack according to claim 6, characterized in that: The battery pack further comprises a pressure relief valve (6), wherein the pressure relief valve (6) is arranged at the through hole (12) or the opening (52), and the pressure relief valve (6) is configured to close the opening (52).

8. The battery pack according to claim 1, characterized in that: The box body (1) comprises an inner bottom wall (13) and an inner side wall (14) arranged around the outer periphery of the inner bottom wall (13); the inner bottom wall (13) and the inner side wall (14) cooperate to enclose the accommodating chamber (11); the pressure relief member (3) is arranged on the inner bottom wall (13); the single battery (21) is arranged on a side of the pressure relief member (3) away from the inner bottom wall (13); and the outlet (33) is opened at a portion of the pressure relief member (3) close to the inner bottom wall (13).

9. The battery pack according to claim 1, characterized in that: The box body (1) comprises an inner bottom wall (13) and an inner side wall (14) arranged around the outer periphery of the inner bottom wall (13); the inner bottom wall (13) and the inner side wall (14) cooperate to enclose the accommodating cavity (11); the battery pack further comprises a fixing member (7); the fixing member (7) is arranged between the single battery (21) and the inner bottom wall (13); the fixing member (7) is connected to the single battery (21) and the box body (1) respectively.

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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