Battery cell, battery and electric device

Abstract

A battery cell (12), a battery (100) and an electric device. The battery cell (12) comprises a casing (121), a first pressure-relief component (125) and a second pressure-relief component (126), wherein the first pressure-relief component (125) is disposed on a first wall portion (121a) of the casing (121), and the first pressure-relief component (125) is configured to actuate when the temperature inside the battery cell (12) or outside the battery cell (12) reaches a first threshold value. The second pressure-relief component (126) is disposed on a second wall portion (121b) of the casing (121), and the second pressure-relief component (126) is configured to actuate when the pressure inside the battery cell (12) reaches a second threshold value. The battery cell (12) has relatively high reliability.

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410418726.0, filed on April 8, 2024, entitled “Battery cell, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0004] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0005] How to improve the reliability of the battery cell is a problem to be solved in the battery technology.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a battery cell, a battery and an electric device, which can improve the reliability of the battery cell.

[0008] In a first aspect, the present application provides a battery cell, the battery cell comprising a housing, a first pressure relief component and a second pressure relief component, the first pressure relief component being disposed at a first wall portion of the housing, the first pressure relief component being configured to actuate when a temperature inside the battery cell or outside the battery cell reaches a first threshold value. The second pressure relief component is disposed at a second wall portion of the housing, the second pressure relief component being configured to actuate when a pressure inside the battery cell reaches a second threshold value.

[0009] In the technical solution of the embodiments of the present application, for a single battery monomer, under normal working conditions of the battery monomer, gas is continuously generated inside the battery monomer, and the second pressure relief component can reduce the risk of damage to the shell caused by excessive gas generation of the battery monomer. The actuation of the second pressure relief component can help reduce the risk of explosion of the battery monomer. When the battery monomer is in thermal runaway, the second pressure relief component can be actuated in advance before the first pressure relief component is actuated, which can help the battery monomer to be relieved in time. After the second pressure relief component is actuated, the first pressure relief component can be actuated as the temperature inside the shell increases, thereby increasing the relief area of the battery monomer and making the relief of the battery monomer more smooth, which can help improve the reliability of the battery monomer. For multiple battery monomers inside the battery, when one of the battery monomers is in thermal runaway, as the battery monomer in thermal runaway is relieved, the temperature inside the battery continues to increase, and the first pressure relief component of the remaining battery monomers can be actuated in advance due to the increase of the temperature outside the battery monomers, which can help reduce the risk of heat spreading to cause thermal runaway of the remaining battery monomers, thereby reducing the risk of burning or even explosion of the battery. This can help improve the reliability of the battery.

[0010] In one or more embodiments of the first aspect, the first pressure relief component is configured to melt when the temperature inside the battery monomer or outside the battery monomer reaches a first threshold value.

[0011] In the above scheme, since the melting process is a relatively rapid physical change process, the first pressure relief component is actuated by melting the first pressure relief component, which can help the battery monomer to be relieved in time. At the same time, the risk of failure of the first pressure relief component to actuate is low, which can help further improve the reliability of the battery monomer.

[0012] In one or more embodiments of the first aspect, the first wall portion has a first pressure relief hole, and the first pressure relief component seals the first pressure relief hole.

[0013] In the above scheme, the first pressure relief component sealing the first pressure relief hole can help the battery monomer to have higher sealing performance. After the first pressure relief component is actuated, the first pressure relief hole can form a relief channel with a predetermined trajectory, which can help the battery monomer to be relieved in a predetermined direction, making the relief of the battery monomer more controllable, reducing the risk of thermal runaway of the remaining battery monomers caused by thermal runaway of a single battery monomer, and thereby helping to improve the reliability of the battery. At the same time, the first pressure relief component is arranged by sealing the first pressure relief hole with the first pressure relief component, which can reduce the design and processing costs.

[0014] In one or more embodiments of the first aspect, a plurality of first pressure relief holes are arranged in an array.

[0015] In the above scheme, the plurality of first pressure relief holes are arranged in an array form while having a large pressure relief area, which is conducive to reducing the area of a single first pressure relief hole, thereby facilitating the interception of particulate matter inside the shell after the thermal runaway of the battery monomer, on the one hand, reducing the risk of particulate matter igniting smoke, on the other hand, reducing the risk of particulate matter piercing the remaining battery monomers to cause thermal runaway of the remaining battery monomers, thereby further improving the reliability of the battery.

[0016] In one or more embodiments of the first aspect, a plurality of first pressure relief holes and a plurality of first pressure relief components are provided, the plurality of first pressure relief holes are arranged at intervals, and the plurality of first pressure relief components are arranged corresponding to the plurality of first pressure relief holes, and the first pressure relief component closes the first pressure relief hole corresponding thereto.

[0017] In the above scheme, when one of the first pressure relief components fails, the remaining pressure relief components can still work normally, which is conducive to reducing the risk that the battery monomer cannot be reliably relieved due to the failure of one of the first pressure relief components, and improves the reliability of the battery monomer. At the same time, the design cost of the first pressure relief component closing the first pressure relief hole corresponding thereto is relatively low.

[0018] In one or more embodiments of the first aspect, at least a part of the first pressure relief component is located in the first pressure relief hole.

[0019] In the above scheme, the first pressure relief component can share part of the space of the battery monomer with the first wall part, which is conducive to improving the volume energy density of the battery monomer.

[0020] In one or more embodiments of the first aspect, the first pressure relief component is injection molded in the first pressure relief hole.

[0021] In the above scheme, the first pressure relief component is molded in the first pressure relief hole by injection molding, which has a relatively low processing cost, and the risk of a gap between the first pressure relief component and the first pressure relief hole is also relatively low, thereby facilitating the battery monomer to have a higher sealing property.

[0022] In one or more embodiments of the first aspect, the first pressure relief component includes a main body part, a first limiting part and a second limiting part, at least a part of the main body part is located in the first pressure relief hole. The first limiting part and the second limiting part are connected to the two ends of the main body part along the thickness direction of the first wall part, the first limiting part and the second limiting part protrude from the outer peripheral surface of the main body, and a part of the first wall part is located between the first limiting part and the second limiting part.

[0023] In the above scheme, the arrangement of the first limiting part and the second limiting part can improve the cooperation stability of the main body part and the first pressure relief hole, reduce the risk of a gap between the main body part and the first pressure relief hole leading to sealing failure of the battery monomer, and also reduce the assembly difficulty of the first pressure relief component.

[0024] In one or more embodiments of the first aspect, the outer surface of the first wall portion is provided with a first recess, the inner surface of the first wall portion is provided with a second recess, the first pressure relief hole penetrates through the bottom wall of the first recess and the bottom wall of the second recess, at least a portion of the first limiting portion is located in the first recess, and at least a portion of the second limiting portion is located in the second recess.

[0025] In the above solution, since at least a portion of the first limiting portion is located in the first recess and at least a portion of the second limiting portion is located in the second recess, the first limiting portion and the second limiting portion can share part of the space of the first wall portion, which is conducive to improving the volumetric energy density of the battery monomer. Meanwhile, the first recess and the second recess can serve as an assembly base of the first pressure relief component, which is conducive to reducing the assembly difficulty of the first pressure relief component.

[0026] In one or more embodiments of the first aspect, the battery monomer further comprises a first sealing member, which is arranged between the first limiting portion and the bottom wall of the first recess or between the second limiting portion and the bottom wall of the second recess along the thickness direction of the first wall portion.

[0027] In the above solution, the arrangement of the first sealing member can reduce the risk of a gap existing between the first wall portion and the first pressure relief component, which is conducive to improving the sealing performance of the battery monomer.

[0028] In one or more embodiments of the first aspect, along the thickness direction of the first wall portion, the first pressure relief component has a first surface facing the inside of the shell and a second surface facing away from the inside of the shell, the first pressure relief component is provided with a third recess, and the third recess is recessed from the first surface to the second surface or the third recess is recessed from the second surface to the first surface.

[0029] In the above solution, on the one hand, the portion of the first pressure relief component where the third recess is arranged is prone to heat accumulation, and on the other hand, the arrangement of the third recess is equivalent to reducing the thickness of part of the first pressure relief component, which is conducive to improving the timeliness of actuation of the first pressure relief component.

[0030] In one or more embodiments of the first aspect, the first pressure relief hole is provided with a plurality of first pressure relief holes, the plurality of first pressure relief holes are arranged at intervals, and the first pressure relief component encloses the plurality of first pressure relief holes.

[0031] In the scheme, since the first pressure relief component closes the plurality of first pressure relief holes, on one hand, after the first pressure relief component starts to actuate, heat spreads inside the first pressure relief component, which is conducive to timely connecting the plurality of first pressure relief holes to the inside and outside of the shell, thereby improving the pressure relief efficiency of the battery monomer. On the other hand, it is conducive to reducing the overall mass of the battery monomer, thereby improving the mass-energy density of the battery monomer. On the other hand, it is also conducive to simplifying the assembly process of the battery monomer and improving the assembly efficiency of the battery monomer.

[0032] In one or more embodiments of the first aspect, the first wall portion has a fourth groove, the fourth groove is arranged on the outer surface or the inner surface of the first wall portion, the first pressure relief hole is arranged on the bottom wall of the fourth groove, and at least a part of the first pressure relief component is accommodated in the fourth groove.

[0033] In the scheme, since at least a part of the first pressure relief component is accommodated in the fourth groove, the first pressure relief component can share part of the space with the first wall portion, which is conducive to improving the volume-energy density of the battery monomer. At the same time, the fourth groove can serve as an assembly base for the first pressure relief component, which is conducive to reducing the assembly difficulty of the first pressure relief component.

[0034] In one or more embodiments of the first aspect, the battery monomer further comprises a first fixing member connected to the first wall portion, and along the thickness direction of the first wall portion, a part of the first pressure relief component is located between the first fixing member and the bottom wall of the fourth groove, and the first fixing member is configured to fix the first pressure relief component in the fourth groove.

[0035] In the scheme, the arrangement of the first fixing member can improve the connection strength between the first pressure relief component and the fourth groove, which is conducive to reducing the deformation of the first pressure relief component and the risk of a gap between the first pressure relief hole and the first pressure relief component that connects the inside and outside of the shell, thereby improving the sealing performance of the battery monomer.

[0036] In one or more embodiments of the first aspect, the first fixing member is annular.

[0037] In the scheme, the shape of the first fixing member is annular, which not only improves the connection strength between the first pressure relief component and the first wall portion, but also reduces the space occupied by the first fixing member, thereby improving the volume-energy density of the battery monomer. At the same time, the annular first fixing member can also reduce the risk of the first fixing member blocking the first pressure relief hole when the battery monomer is in thermal runaway.

[0038] In one or more embodiments of the first aspect, the outer circumferential surface of the first fixing member is connected to the side wall of the fourth groove.

[0039] In the scheme, at least part of the first fixing member can be accommodated in the fourth groove, so that the first fixing member and the first wall portion jointly occupy part of the space, which is conducive to improving the volume energy density of the battery monomer. The sidewall of the fourth groove can serve as an assembly base of the first fixing member, so that the positioning of the first fixing member is more convenient, and the assembly efficiency of the first fixing member is improved.

[0040] In one or more embodiments of the first aspect, the battery monomer further comprises a second sealing member, which is located between the first pressure relief component and the bottom wall of the fourth groove in the thickness direction of the first wall portion, and surrounds the plurality of first pressure relief holes.

[0041] In the scheme, the second sealing member can reduce the risk of a gap between the first pressure relief component and the bottom wall of the fourth groove, thereby improving the sealing performance of the battery monomer.

[0042] In one or more embodiments of the first aspect, the first wall portion and the second wall portion are located on the same wall of the shell, the second wall portion is provided with a second pressure relief hole, the second pressure relief component is installed in the second pressure relief hole, and the plurality of first pressure relief holes are arranged around the second pressure relief hole.

[0043] In the scheme, the first pressure relief component and the second pressure relief component are arranged on the same wall of the shell, and after the second pressure relief component is actuated, the discharge is discharged from the second pressure relief hole to the outside of the shell. At the same time, part of the heat carried by the discharge can be more quickly transferred to the first pressure relief component through the wall of the shell, so that the first pressure relief component can be opened in time, thereby further improving the reliability of the battery monomer.

[0044] In one or more embodiments of the first aspect, the first pressure relief component is provided with a first through hole, and the projection of the second pressure relief component at least partially overlaps the first through hole in the thickness direction of the second wall portion.

[0045] In the scheme, the first through hole can serve as a pressure relief channel for the second pressure relief component, that is, the pressure relief channel required by the second pressure relief component shares part of the space with the first pressure relief component, thereby improving the volume energy density of the battery monomer. At the same time, after the discharge flows through the first through hole, part of the heat carried by the discharge can be more quickly diffused on the first pressure relief component, so that more first pressure relief holes can be timely connected to the inside and outside of the shell, thereby enabling the first pressure relief component to be opened in time.

[0046] In one or more embodiments of the first aspect, the second wall portion has a first boss protruding from the outer surface or the inner surface of the second wall portion, the first boss surrounds the second pressure relief hole, and the first pressure relief component is sleeved on the outer circumferential surface of the first boss through the first through hole.

[0047] The first boss can serve as an assembly base of the first pressure relief component, thereby reducing assembly difficulty of the first pressure relief component.

[0048] In one or more embodiments of the first aspect, the battery monomer further comprises a second fixing member connected to the outer circumferential surface of the first boss, and a portion of the first pressure relief component is located between the second fixing member and the second wall portion in the thickness direction of the second wall portion. The second fixing member is configured to fix the first pressure relief component to the second wall portion.

[0049] In the above scheme, the second fixing member can improve the connection strength between the first pressure relief component and the second wall portion, thereby reducing the risk of deformation of the first pressure relief component, causing a gap between the first pressure relief hole and the first pressure relief component to communicate the inside and outside of the shell, and improving the sealing performance of the battery monomer.

[0050] In one or more embodiments of the first aspect, the second fixing member is annular.

[0051] In the above scheme, the second fixing member is annular in shape, which can not only improve the connection strength between the first pressure relief component and the second wall portion, but also reduce the space occupied by the second fixing member, thereby improving the volumetric energy density of the battery monomer. At the same time, the annular second fixing member can also reduce the risk of the second fixing member blocking the second pressure relief hole when the battery monomer is in thermal runaway.

[0052] In one or more embodiments of the first aspect, the outer circumferential surface of the second fixing member is connected to the outer circumferential surface of the first boss.

[0053] In the above scheme, the second fixing member and the first boss jointly occupy part of the space, thereby improving the volumetric energy density of the battery monomer. In addition, the outer circumferential surface of the first boss can serve as an assembly base of the second fixing member, which makes the positioning of the second fixing member more convenient and improves the assembly efficiency of the second fixing member.

[0054] In one or more embodiments of the first aspect, the battery monomer further comprises a third sealing member located between the first pressure relief component and the second wall portion in the thickness direction of the second wall portion, and the third sealing member is arranged around the first through hole.

[0055] In the above scheme, the third sealing member can reduce the risk of a gap between the first pressure relief component and the second wall portion, thereby improving the sealing performance of the battery monomer.

[0056] In one or more embodiments of the first aspect, the area of the first pressure relief hole is S1, and satisfies: 1mm 2 ≤ S1 ≤ 100mm 2 .

[0057] In the above scheme, when S1 ≥ 1mm2 When S1≤100mm, the first pressure relief hole can have a larger area, so that the first pressure relief component has a larger pressure relief area, which is beneficial to improving the pressure relief efficiency of the battery cell; when S1≤100mm 2 When S1 is less than 100 mm2, the first wall portion can have a higher structural stability, which is beneficial to improving the reliability of the battery cell. Therefore, when 1 mm2≤S1≤100 mm2, the battery cell can have both higher pressure relief efficiency and higher reliability.

[0058] In one or more embodiments of the first aspect, 2 mm 2 ≤S1≤50mm 2 .

[0059] In the above scheme, when S1≥2mm 2 When S1≤50mm, the area of ​​the first pressure relief hole can be further increased, which is beneficial to further improve the pressure relief efficiency of the battery cell; when S1≤50mm 2 When 2mm, the structural stability of the first wall portion can be further improved, which is beneficial to further improve the reliability of the battery cell. Therefore, when 2mm 2 ≤S1≤50mm 2 When the battery is used as a storage medium, the pressure relief efficiency of the battery cell can be further improved while further improving its reliability.

[0060] In one or more embodiments of the first aspect, the second pressure relief component includes a body and a filter element, the body has an open area, the filter element is arranged on a side of the open area facing the interior of the housing, and the filter element is used to divide the open area into multiple sub-areas.

[0061] In the above scheme, the setting of the filter element can enable the battery cell to have a higher pressure relief area, while being conducive to intercepting particulate matter after thermal runaway of the battery cell within the outer shell. On the one hand, it can reduce the risk of particulate matter igniting flue gas, and on the other hand, it can reduce the risk of particulate matter piercing the remaining battery cells and causing thermal runaway of the remaining battery cells, thereby helping to further improve the reliability of the battery.

[0062] In one or more embodiments of the first aspect, a fifth groove is provided on the side of the second pressure relief component facing the interior of the shell, the bottom wall of the fifth groove forms an opening area, at least a portion of the filter element is accommodated in the fifth groove, and the filter element is connected to the side wall of the fifth groove.

[0063] In the above solution, the filter element can share part of the space with the fifth groove, which is beneficial to reducing the volume energy density of the battery cell. At the same time, the side wall of the fifth groove can be used as the assembly base of the filter element, which is beneficial to simplify the assembly difficulty of the filter element and improve the assembly efficiency of the battery cell.

[0064] In one or more embodiments of the first aspect, the area of ​​the sub-region is S2, which satisfies: 1mm 2≤ S2 ≤ 400 mm 2 .

[0065] In the above scheme, when S2≥1 mm 2 , the sub-area has a larger area, so that the second pressure relief component has a larger pressure relief area, which is beneficial to improve the pressure relief efficiency of the battery monomer; when S2≤400 mm 2 , it is beneficial to intercept the relatively small particles inside the shell, thereby reducing the risk of the remaining battery monomers thermal runaway and igniting smoke caused by the particles spewing out of the shell, and improving the reliability of the battery monomer. Therefore, when 1 mm 2 ≤ S2 ≤ 400 mm 2 , the battery monomer can have both high pressure relief efficiency and high reliability.

[0066] In one or more embodiments of the first aspect, 2 mm 2 ≤ S2 ≤ 200 mm 2 .

[0067] In the above scheme, when S2≥2 mm 2 , the area of the sub-area can be further increased, so that the second pressure relief component has a larger pressure relief area, which is beneficial to further improve the pressure relief efficiency of the battery monomer; when S2≤200 mm 2 , it is beneficial to intercept the smaller particles inside the shell, thereby further reducing the risk of the remaining battery monomers thermal runaway and igniting smoke caused by the particles spewing out of the shell, and improving the reliability of the battery monomer. Therefore, when 2 mm 2 ≤ S2 ≤ 200 mm 2 , the battery monomer can further improve the pressure relief efficiency while further reducing the risk of the remaining battery monomers thermal runaway and igniting smoke caused by the particles spewing out of the shell.

[0068] In one or more embodiments of the first aspect, the first threshold value is T, and satisfies: 95℃≤T≤300℃.

[0069] In one or more embodiments of the first aspect, the second threshold value is P, and satisfies: 0.3Mpa≤P≤2.3Mpa.

[0070] In one or more embodiments of the first aspect, the shell includes a shell body and an end cover, the shell body includes a bottom wall and a side wall surrounding the bottom wall, one end of the side wall is connected to the bottom wall, the other end of the side wall surrounds an opening, and the end cover is used to cover the opening. Wherein, the end cover is provided with the first pressure relief component and the second pressure relief component.

[0071] In the above scheme, the first pressure relief component and the second pressure relief component are provided on the end cover, which is convenient to process, and the assembly difficulty of the first pressure relief component and the second pressure relief component is relatively low.

[0072] In one or more embodiments of the first aspect, the bottom wall is provided with the first pressure relief component.

[0073] In one or more embodiments of the first aspect, the bottom wall is provided with the first pressure relief component.

[0074] In one or more embodiments of the first aspect, the housing comprises a shell and an end cover, the shell comprises a bottom wall and a side wall surrounding the bottom wall, one end of the side wall is connected to the bottom wall, the other end of the side wall surrounds an opening, and the end cover is used to cover the opening. The end cover is provided with the second pressure relief component, and the bottom wall is provided with the first pressure relief component.

[0075] In one or more embodiments of the first aspect, the bottom wall is provided with the first pressure relief component.

[0076] In one or more embodiments of the first aspect, the housing comprises a shell and an end cover, the shell comprises a bottom wall and a side wall surrounding the bottom wall, one end of the side wall is connected to the bottom wall, the other end of the side wall surrounds an opening, and the end cover is used to cover the opening. The end cover is provided with the second pressure relief component, and the bottom wall is provided with the first pressure relief component.

[0077] In one or more embodiments of the first aspect, the bottom wall is provided with the first pressure relief component.

[0078] In one or more embodiments of the first aspect, the housing comprises a shell, a first end cover and a second end cover, the shell comprises a third side wall and a fourth side wall oppositely arranged along a third direction, and a first side wall and a second side wall oppositely arranged along a second direction, the third side wall, the fourth side wall, the first side wall and the second side wall surround to form a containing cavity with a first opening and a second opening, the first opening and the second opening are oppositely arranged along a first direction, the first end cover is used to cover the first opening, and the second end cover is used to cover the second opening, the first direction, the second direction and the third direction are perpendicular to each other. The third side wall is provided with the second pressure relief component, and the first end cover and the second end cover are provided with the first pressure relief component.

[0079] In one or more embodiments of the first aspect, the bottom wall is provided with the first pressure relief component.

[0080] In a second aspect, the present application provides a battery comprising the battery cell in one or more embodiments of the first aspect.

[0081] In the above solution, the battery cell in one or more embodiments of the first aspect has high reliability, and thus the battery comprising the battery cell in one or more embodiments of the first aspect also has high reliability.

[0082] In a third aspect, the present application provides a power consuming device comprising the battery cell in one or more embodiments of the first aspect or the battery in one or more embodiments of the second aspect, and the battery cell or the battery is used to provide electric energy.

[0083] In the above solution, the battery cell in one or more embodiments of the first aspect or the battery in one or more embodiments of the second aspect has high reliability, and thus the power consuming device comprising the battery cell in one or more embodiments of the first aspect or the power consuming device comprising the battery in one or more embodiments of the second aspect has high reliability.

[0084] The above description is merely a summary of the technical solutions of the present application. In order to enable one of ordinary skill in the art to better understand the technical means of the present application and implement the same according to the contents of the specification, and in order to make other purposes, features and advantages of the present application more apparent and easy to understand, the following specific embodiments of the present application are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0085] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not meant to limit the present application. Moreover, the same reference numerals in all the drawings represent the same elements. In the drawings:

[0086] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0087] FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

[0088] FIG. 3 is an exploded view of a battery cell according to some embodiments of the present application;

[0089] FIG. 4 is an exploded view of a partial structure of a battery cell according to some embodiments of the present application;

[0090] FIG. 5 is a top view of a battery cell according to some embodiments of the present application;

[0091] FIG. 6 is a sectional view at A-A in FIG. 5;

[0092] FIG. 7 is an enlarged view at B in FIG. 6;

[0093] FIG. 8 is an exploded view of a partial structure of a battery cell according to yet other embodiments of the application;

[0094] FIG. 9 is a top view of a battery cell according to yet other embodiments of the application;

[0095] FIG. 10 is a cross-sectional view at C-C in FIG. 9;

[0096] FIG. 11 is a partial enlarged view at D in FIG. 10;

[0097] FIG. 12 is an exploded view of a partial structure of a battery cell according to still other embodiments of the application;

[0098] FIG. 13 is a partial enlarged view at E in FIG. 12;

[0099] FIG. 14 is a top view of a battery cell according to still other embodiments of the application;

[0100] FIG. 15 is a cross-sectional view at F-F in FIG. 14;

[0101] FIG. 16 is a cross-sectional view at G in FIG. 15;

[0102] FIG. 17 is an exploded view of a partial structure of a battery cell according to other embodiments of the application;

[0103] FIG. 18 is a partial enlarged view at H in FIG. 17;

[0104] FIG. 19 is a top view of a battery cell according to other embodiments of the application;

[0105] FIG. 20 is a cross-sectional view at I-I in FIG. 19;

[0106] FIG. 21 is a cross-sectional view at J in FIG. 20;

[0107] FIG. 22 is an exploded view of a partial structure of a battery cell according to some other embodiments of the application;

[0108] FIG. 23 is a top view of a battery cell according to some other embodiments of the application;

[0109] FIG. 24 is a cross-sectional view at K-K in FIG. 23;

[0110] FIG. 25 is a partial enlarged view at L in FIG. 24;

[0111] FIG. 26 is an exploded view of a partial structure of a battery cell according to some embodiments of the application, showing a first fixing member;

[0112] FIG. 27 is a top view of a battery cell according to some embodiments of the application, showing a first fixing member;

[0113] FIG. 28 is a cross-sectional view at M-M in FIG. 27;

[0114] Fig. 29 is a sectional view taken at N in Fig. 28;

[0115] Fig. 30 is an exploded view of a partial structure of a battery cell of some embodiments of the application, showing a second fixing member;

[0116] Fig. 31 is a top view of a battery cell of some embodiments of the application, showing a second pressure relief component;

[0117] Fig. 32 is a sectional view taken at O-O in Fig. 31 ;

[0118] Fig. 33 is a partial enlarged view taken at Q in Fig. 32;

[0119] Fig. 34 is a sectional view taken at P-P in Fig. 31 ;

[0120] Fig. 35 is a partial enlarged view taken at R in Fig. 34;

[0121] Fig. 36 is an exploded view of a partial structure of a battery cell of some embodiments of the application, showing a second pressure relief component and a first fixing member;

[0122] Fig. 37 is a top view of a battery cell of some embodiments of the application, showing a first pressure relief component and a second pressure relief component;

[0123] Fig. 38 is a sectional view taken at S-S in Fig. 37;

[0124] Fig. 39 is a partial enlarged view taken at U in Fig. 38;

[0125] Fig. 40 is a sectional view taken at T-T in Fig. 37;

[0126] Fig. 41 is a partial enlarged view taken at V in Fig. 40;

[0127] Fig. 42 is an isometric view of a battery cell of some embodiments of the application;

[0128] Fig. 43 is an isometric view of a battery cell of some embodiments of the application, showing a bottom wall;

[0129] Fig. 44 is an isometric view of a battery cell of yet some embodiments of the application;

[0130] Fig. 45 is an isometric view of a battery cell of yet some embodiments of the application, showing a bottom wall;

[0131] Fig. 46 is an isometric view of a battery cell of still some embodiments of the application;

[0132] Fig. 47 is an isometric view of a battery cell of still some embodiments of the application, showing a bottom wall;

[0133] Fig. 48 is an isometric view of a battery cell of some other embodiments of the application;

[0134] Figure 49 is an isometric view of a battery cell of some embodiments of the application, showing a bottom wall;

[0135] Figure 50 is an isometric view of a battery cell of some embodiments of the application, showing a third side wall;

[0136] Figure 51 is an isometric view of a battery cell of some embodiments of the application, showing a fourth side wall;

[0137] Figure 52 is an isometric view of a battery cell of some embodiments of the application, showing a first end cap;

[0138] Figure 53 is an isometric view of a battery cell of some embodiments of the application, showing a second side wall.

[0139] Reference signs in the detailed description of the embodiments are as follows:

[0140] 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery; 11 - case; 111 - first case body; 112 - second case body; 12 - battery cell; 121 - shell; 1211 - end cap; 1212 - housing; 12121 - bottom wall; 12122 - third side wall; 12123 - fourth side wall; 12124 - first side wall; 12125 - second side wall; 12126 - first end cap; 12127 - second end cap; 121a - first wall portion; 121b - second wall portion; 122 - electrode assembly; 123 - electrode terminal; 124 - adapter tab; 125 - first pressure relief component; 1251 - main body portion; 1252 - first stop portion; 1253 - second stop portion; 1254 - third recess; 1255 - first through hole; 126 - second pressure relief component; 1261 - fifth recess; 127 - first pressure relief hole; 128 - first recess; 129 - second recess; 1210 - first seal; 1213 - fourth recess; 1214 - first fixing member; 1215 - second seal; 1216 - second pressure relief hole; 1217 - second fixing member; 1218 - third seal; 1219 - filter member; 1220 - first boss; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0141] The embodiments of the technical solutions of the application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the application, and therefore only serve as examples, and cannot limit the protection scope of the application.

[0142] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0143] In the description of the embodiments of the present application, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0144] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0145] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0146] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application, which do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation.

[0147] In the present application, the battery cell can include, but is not limited to, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The shape of the battery cell can include, but is not limited to, a cylinder, a flat body, a cuboid, or other shapes, etc. The battery cell can include, but is not limited to, a cylindrical battery cell, a square battery cell, a soft pack battery cell, and a blade battery cell according to the packaging method.

[0148] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cell, battery module, and battery. A battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impacts, heat, vibration, etc. A battery refers to the final state of the battery system installed in an electric vehicle. The battery referred to in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery generally includes a box for packaging one or more battery cells. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells.

[0149] In the following, the rectangular battery cell will be mainly discussed. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells or blade battery cells in some aspects.

[0150] In a general battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes an end cap and a case, and the end cap closes the opening of the case to define a receiving space for accommodating the electrode assembly.

[0151] The electrode assembly is accommodated in the receiving space, and the electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to pass a large current without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. In addition, the forming method of the electrode assembly can include but is not limited to a jelly-roll type or a stacked type, etc.

[0152] The tab generally leads out the electrical energy of the electrode assembly by electrically connecting with a conductive piece, in some cases, the conductive piece is a transition piece connecting the tab and the electrode terminal, and in some other cases, the conductive piece is the electrode terminal.

[0153] The electrode terminals generally include a positive electrode terminal and a negative electrode terminal. For prismatic battery cells, the electrode terminals are generally disposed at the end cap portion. In some other cases, the electrode terminals can also be disposed at the housing portion. A plurality of battery cells are connected in series and / or in parallel via the electrode terminals for various applications.

[0154] For battery cells, there are generally at least three protective measures. Specifically, the protective measures include at least a switching element, selection of appropriate separator material, and a pressure relief component.

[0155] The pressure relief component refers to an element or component that is actuated to release the internal pressure or temperature of the battery cell when the internal pressure or temperature or other conditions of the battery cell reaches a predetermined threshold. The threshold is designed differently according to the design requirements. The threshold can depend on the material of one or more of the positive electrode plate, the negative electrode plate, the electrolyte, and the separator in the battery cell. The pressure relief component can take the form of, for example, a burst valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature or other conditions of the battery cell reaches a predetermined threshold, the pressure relief component performs an action or a weak structure provided in the pressure relief component is broken, thereby forming an opening or passage for the internal pressure or temperature to be released. The weak structure generally has a melting point and / or thickness lower than other regions of the pressure relief component. For example, the weak structure can be a notch groove provided on the surface of the pressure relief component, etc.

[0156] The "actuation" mentioned in the present application refers to the pressure relief component generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell can be released, so that the internal pressure and temperature of the battery cell can be released. The action generated by the pressure relief component can include but is not limited to: at least part of the pressure relief component breaking, breaking, being torn, melting, or opening, etc. The actuation of the pressure relief component can also be referred to as the opening of the pressure relief component. When the pressure relief component is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as the discharge. In this way, the battery cell can be relieved of pressure and temperature in a controllable manner, thereby reducing the risk of a more serious accident. For example, when a short circuit, overcharge, or the like occurs, it can cause thermal runaway inside the battery cell, resulting in a sudden increase in pressure or temperature. In this case, the internal pressure and temperature can be released outwardly by the pressure relief component to reduce the probability of explosion or fire of the battery cell.

[0157] The discharge from the battery cell mentioned in the present application includes but is not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0158] The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, and other performance parameters, and the reliability of the battery also needs to be considered.

[0159] In a general battery cell, the shell is provided with only one pressure relief component, and when the battery cell is in thermal runaway, the discharge material inside the shell is discharged through the pressure relief component to achieve the purpose of relieving the pressure inside the battery cell. In such a battery cell, the shell is provided with only one pressure relief component, and the pressure relief capacity of the shell is insufficient, which is prone to cause the pressure relief to be not timely, and the reliability of the battery cell is poor.

[0160] In view of this, the battery cell provided in the present application includes a shell, a first pressure relief component, and a second pressure relief component. The first pressure relief component is arranged on a first wall portion of the shell, and the first pressure relief component is configured to actuate when the temperature inside the battery cell or outside the battery cell reaches a first threshold value. The second pressure relief component is arranged on a second wall portion of the shell, and the second pressure relief component is configured to actuate when the pressure inside the battery cell reaches a second threshold value. For a single battery cell, under normal working conditions of the battery cell, gas is continuously generated inside the battery cell. The arrangement of the second pressure relief component can reduce the risk of damage to the shell caused by excessive gas generation of the battery cell, and the actuation of the second pressure relief component is beneficial to reduce the risk of explosion of the battery cell. When the battery cell is in thermal runaway, the second pressure relief component can actuate in advance before the first pressure relief component actuates, which is beneficial to timely relieve the pressure of the battery cell. After the second pressure relief component actuates, the first pressure relief component can actuate as the temperature inside the shell increases, thereby increasing the pressure relief area of the battery cell, making the pressure relief of the battery cell more smooth, and being beneficial to improve the reliability of the battery cell. For a plurality of battery cells inside the battery, when one of the battery cells is in thermal runaway, as the pressure relief of the battery cell in thermal runaway, the temperature inside the battery continuously increases, and the first pressure relief component of the remaining battery cells can actuate in advance due to the increase of the temperature outside the battery cells, which is beneficial to reduce the risk of heat spreading to cause the remaining battery cells to be in thermal runaway, thereby reducing the risk of burning or even explosion of the battery. This is beneficial to improve the reliability of the battery.

[0161] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electric devices using batteries.

[0162] The electric device includes but is not limited to: electric vehicles, electric vehicles, ships, and spacecraft, etc., for example, the spacecraft includes airplanes, rockets, space shuttles, and spacecraft, etc.

[0163] The following embodiments are described for convenience with a vehicle 1000 as an example of an electric device of an embodiment of the present application.

[0164] For example, FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle. The vehicle 1000 can be provided with a motor 300, a controller 200, and a battery 100. The controller 200 is configured to control the battery 100 to supply power to the motor 300. For example, the battery 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery 100 can be configured to supply power to the vehicle 1000. For example, the battery 100 can be configured as an operating power source of the vehicle 1000, and can be configured to supply power to the circuit system of the vehicle 1000, such as the power required for starting, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 can be configured as not only an operating power source of the vehicle 1000, but also a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power to the vehicle 1000.

[0165] In order to meet different power requirements, the battery 100 can include a plurality of battery cells 12. The plurality of battery cells 12 can be connected in series, in parallel, or in a mixed connection. The mixed connection refers to a combination of series connection and parallel connection. The battery 100 can also be referred to as a battery pack. Alternatively, the plurality of battery cells 12 can be connected in series, in parallel, or in a mixed connection to form a battery module, and the plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form the battery 100. That is, the plurality of battery cells 12 can be directly connected to form the battery 100, or the plurality of battery cells 12 can be connected to form a battery module, and the battery module can be connected to form the battery 100.

[0166] For example, please refer to FIG. 2, which is an exploded view of the battery 100 according to some embodiments of the present application. The battery 100 can include a plurality of battery cells 12. The battery 100 can also include a box body 11, which has a hollow structure, and the plurality of battery cells 12 can be accommodated in the box body 11. As shown in FIG. 2, the first box body 111 and the second box body 112 are coupled together. The shapes of the first box body 111 and the second box body 112 can be determined according to the shape of the plurality of battery cells 12. The first box body 111 and the second box body 112 can each have an opening surface. For example, the first box body 111 and the second box body 112 can each be a hollow cuboid and have only one surface as an opening surface. The opening surface of the first box body 111 and the opening surface of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are coupled to each other to form the box body 11 having a closed cavity. The plurality of battery cells 12 can be connected in parallel, in series, or in a mixed connection, and then placed in the box body 11 formed by the coupling of the first box body 111 and the second box body 112.

[0167] Optionally, the battery 100 can further include other structures, which are not described herein. For example, the battery 100 can further include a current collecting component for realizing electrical connection between the plurality of battery cells 12, such as parallel connection, series connection or mixed connection. Specifically, the current collecting component can realize electrical connection between the battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the current collecting component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the plurality of battery cells 12 can be further led out through the box 11 by the conductive mechanism.

[0168] According to different power requirements, the number of battery cells 12 can be set to any value. The plurality of battery cells 12 can be connected in series, parallel or mixed connection to achieve larger capacity or power. Since the number of battery cells 12 included in each battery 100 can be large, in order to facilitate installation, the battery cells 12 can be arranged in groups, and each group of battery cells 12 forms a battery module. The number of battery cells 12 included in the battery module is not limited and can be set according to requirements. The battery 100 can include a plurality of battery modules, and these battery modules can be connected in series, parallel or mixed connection.

[0169] Please refer to FIG. 3, which is an exploded view of the battery cell 12 according to some embodiments of the present application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 can include a shell 1212, and the plurality of walls of the shell 1212, i.e. the plurality of walls of the housing 121, enclose a cavity which can be used to accommodate the electrode assembly 122. The shape of the shell 1212 is determined according to the shape of the combined one or more electrode assemblies 122. For example, the shell 1212 can be a hollow cuboid or a square or a regular polyhedron, and one of the faces of the shell 1212 has an opening so that the one or more electrode assemblies 122 can be placed in the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution.

[0170] The battery cell 12 can further include two electrode terminals 123, which can be arranged on the end cover 1211. The end cover 1211 is usually a flat plate, and the two electrode terminals 123 are fixed to the flat surface of the end cover 1211. The two electrode terminals 123 are respectively a positive electrode terminal 123 and a negative electrode terminal 123. Each electrode terminal 123 is respectively provided with a jumper 124, which is located between the end cover 1211 and the electrode assembly 122, for realizing electrical connection between the electrode assembly 122 and the electrode terminal 123. In the battery cell 12, according to actual use requirements, the electrode assembly 122 can be arranged as a single electrode assembly or a plurality of electrode assemblies, and the battery cell 12 is provided with a plurality of independent electrode assemblies 122.

[0171] According to some embodiments of the present application, referring to FIG. 3, the present application provides a battery cell 12, which includes a housing 121, a first pressure relief component 125 disposed on a first wall portion 121a of the housing 121, and a second pressure relief component 126 disposed on a second wall portion 121b of the housing 121. The first pressure relief component 125 is configured to actuate when a temperature inside the battery cell 12 or outside the battery cell 12 reaches a first threshold value. The second pressure relief component 126 is configured to actuate when a pressure inside the battery cell 12 reaches a second threshold value.

[0172] The housing 121 is a component for containing an electrode assembly 122, an electrolyte, and the like. As an example, the housing 121 can include a case 1212 and an end cap 1211.

[0173] The case 1212 can be a hollow structure having an opening at one end, or a hollow structure having openings at opposite ends. The case 1212 can have various shapes, such as a cylindrical shape, a prismatic shape, and the like. The case 1212 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, and the like.

[0174] The end cap 1211 is a component that closes the opening of the case 1212 to isolate the internal environment of the battery cell 12 from the external environment. The end cap 1211 and the case 1212 together define a receiving space for containing the electrode assembly 122, the electrolyte, and other components. The end cap 1211 and the case 1212 can be connected by, for example, crimping, welding, or the like. The end cap 1211 can have a shape that matches the shape of the housing 121, such as a rectangular plate shape that matches a rectangular cuboid structure of the case 1212, or a circular plate shape that matches a cylindrical structure of the case 1212. The end cap 1211 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, and the like. The end cap 1211 and the case 1212 can be made of the same material or different materials.

[0175] In an embodiment in which the case 1212 has an opening at one end, one end cap 1211 can be provided. In an embodiment in which the case 1212 has openings at opposite ends, two end caps 1211 can be provided. The two end caps 1211 can close the two openings of the case 1212, respectively, and the two end caps 1211 and the case 1212 can together define the receiving space.

[0176] The first wall portion 121a and the second wall portion 121b refer to portions of a wall of the housing 121, and the first wall portion 121a and the second wall portion 121b can be located on the same wall or different walls of the housing 121. For example, in an embodiment in which the housing 121 includes an end cover 1211 and a shell 1212, the first wall portion 121a can be a portion of the end cover 1211, and the second wall portion 121b can be a portion of a certain wall of the shell 1212. For another example, the first wall portion 121a and the second wall portion 121b can both be portions of the end cover 1211.

[0177] The first pressure relief component 125 can be integrally formed with the first wall portion 121a, for example, the first pressure relief component 125 and the first wall portion 121a can be simultaneously formed by a method such as insert casting. The first pressure relief component 125 can be separately provided from the second wall portion 121b, and the first pressure relief component 125 is mounted to the first wall portion 121a. The second pressure relief component 126 can be integrally formed with the second wall portion 121b, for example, the second pressure relief component 126 can be formed as a thin portion or the like of the second wall portion 121b when the second wall portion 121b is formed. The second pressure relief component 126 can be separately provided from the second wall portion 121b, and the second pressure relief component 126 is mounted to the second wall portion 121b.

[0178] The first pressure relief component 125 can be provided in one or more, and the plurality of first pressure relief components 125 can be located on the same wall or different walls of the housing 121. The second pressure relief component 126 can be provided in one or more, and the plurality of second pressure relief components 126 can be located on the same wall or different walls of the housing 121. In some embodiments, referring to FIG. 3, the plurality of first pressure relief components 125 can be provided around the second pressure relief component 126. In other embodiments, referring to FIG. 44, the second pressure relief component 126 can be provided separately from the plurality of first pressure relief components 125.

[0179] In some embodiments, a pressure relief hole is provided in a wall of the housing 121, and the first pressure relief component 125 can be a component that fills the pressure relief hole, and the melting point of the component is lower than the melting point of the wall of the housing 121 in which the pressure relief hole is provided. For example, the material of the housing 121 can be a metal such as copper, iron, aluminum, steel, aluminum alloy, etc., and the material of the first pressure relief component 125 can include but is not limited to plastic, silicone rubber, fluororubber, etc. In an embodiment in which the material of the first pressure relief component 125 is plastic, the material of the first pressure relief component 125 can be polyethylene, polypropylene, polycarbonate, polyester, polyamide, polyvinylidene fluoride, etc. In an embodiment in which the material of the first pressure relief component 125 is metal, the material of the first pressure relief component 125 can be lead-tin-antimony alloy, etc.

[0180] In some embodiments, the first pressure relief component 125 and the housing 121 are both made of metal material, and in such embodiments, the first pressure relief component 125 is a component having a melting point lower than the melting point of the wall of the housing 121 where the first pressure relief component 125 is arranged. Of course, in other embodiments, the first pressure relief component 125 can also refer to a component having a temperature-sensitive sensing element, which opens when the temperature-sensitive sensing element detects that the temperature reaches a first threshold value, and connects the inside and outside of the housing 121 to release the pressure inside the battery cell 12.

[0181] The first pressure relief component 125 and the second pressure relief component 126 are two pressure relief components in the battery cell 12. For a single battery cell 12, when the battery cell 12 is in thermal runaway, in general, the flow speed of the high-pressure gas in the exhaust is relatively fast, which can also be referred to as relatively intense gas eruption. The battery cell 12 is more likely to reach the second threshold value. The temperature near the first pressure relief component 125 increases to the first threshold value relatively slowly, so in general, the second pressure relief component 126 will open before the first pressure relief component 125. When the battery cell 12 is in thermal runaway, the first pressure relief component 125 can open after the second pressure relief component 126 opens for a certain period of time. For example, after the second pressure relief component 126 opens, part of the heat of the exhaust converges near the first pressure relief component 125, and after the heat near the first pressure relief component 125 reaches the first threshold value, the first pressure relief component 125 opens. The first pressure relief component 125 can also not open after the second pressure relief component 126 opens. For example, after the second pressure relief component 126 opens, as the exhaust of the battery cell 12 inside the housing 121 is discharged, the thermal runaway reaction of the electrode assembly 122 does not continue to spread, and the temperature near the first pressure relief component 125 does not reach the first threshold value, so the first pressure relief component 125 does not open. Of course, in some cases, the cause of the thermal runaway of the battery cell 12 is short circuiting or the like, which can cause the temperature of the electrode assembly 122 to increase rapidly, and the temperature near the first pressure relief component 125 has already reached the first threshold value, but the gas generated by the thermal decomposition of the electrode assembly 122 has not caused the pressure inside the battery cell 12 to reach the second threshold value. At this time, the first pressure relief component 125 will open before the second pressure relief component 126. When the battery cell 12 is in normal operation, a certain amount of gas will be generated inside the battery cell 12. When too much gas accumulates in the closed housing 121, it can cause the risk of separation of the shell covers of the housing 121, such as the separation of the end cover 1211 and the shell 1212. By arranging the second pressure relief component 126, the risk of separation of the shell covers of the housing 121 caused by normal gas generation of the battery cell 12 can be reduced, thereby reducing the risk of internal short circuit of the battery 100 caused by the separation of the shell covers.

[0182] For the battery 100 including a plurality of battery cells 12, for example, please refer to FIG. 3, the plurality of battery cells 12 are arranged along a direction, when one of the battery cells 12 is in thermal runaway, the battery cell 12 is called a trigger battery cell, the discharge of the trigger battery cell in thermal runaway can be ejected into the battery 100, the temperature around the trigger battery cell can be increased, at this time, the first pressure relief component 125 on the battery cell 12 adjacent to the trigger battery cell can be actuated, which can reduce the risk of excessive deformation of the shell 121 of the battery cell 12 adjacent to the trigger battery cell due to the thermal runaway of the trigger battery cell, thereby triggering the risk of short circuiting and triggering thermal runaway. In addition, due to the opening of the first pressure relief component 125 of the battery cell 12 adjacent to the trigger battery cell, the heat accumulated around the trigger battery cell can also evaporate part of the electrolyte of the battery cell 12 adjacent to the trigger battery cell, which can also alleviate the risk of triggering the battery cell 12 adjacent to the trigger battery cell to be in thermal runaway. That is, when the battery cell 12 is provided with the first pressure relief component 125 and the second pressure relief component 126, after one of the battery cells 12 is in thermal runaway, the risk of thermal runaway spreading can be reduced.

[0183] In the technical scheme of the embodiments of the present application, for a single battery cell 12, under normal working conditions of the battery cell 12, gas is continuously generated inside the battery cell 12, the second pressure relief component 126 can reduce the risk of damage to the shell 121 due to excessive gas generation of the battery cell 12, and the actuation of the second pressure relief component 126 is beneficial to reduce the risk of explosion of the battery cell 12. When the battery cell 12 is in thermal runaway, the second pressure relief component 126 can be actuated in advance before the first pressure relief component 125 is actuated, which is beneficial to enable the battery cell 12 to be depressurized in time. After the second pressure relief component 126 is actuated, as the temperature inside the shell 121 increases, the first pressure relief component 125 can be actuated, thereby increasing the pressure relief area of the battery cell 12, making the pressure relief of the battery cell 12 more smooth, and being beneficial to improve the reliability of the battery cell 12. For a plurality of battery cells 12 inside the battery 100, when one of the battery cells 12 is in thermal runaway, as the battery cell 12 in thermal runaway is depressurized, the temperature inside the battery 100 continues to increase, and the first pressure relief component 125 of the remaining battery cells 12 can be actuated in advance due to the increase of the temperature outside the battery cells 12, which is beneficial to reduce the risk of heat spreading to cause the remaining battery cells 12 to be in thermal runaway, thereby reducing the risk of combustion or even explosion of the battery 100. It is beneficial to improve the reliability of the battery 100.

[0184] According to some embodiments of the present application, please refer to FIGS. 12-29, the first pressure relief component 125 is configured to melt when the temperature inside the battery cell 12 or outside the battery cell 12 reaches a first threshold value.

[0185] When the battery cell 12 is in thermal runaway and the temperature inside the battery cell 12 increases to the first threshold, the first pressure relief component 125 can melt to connect the inside and the outside of the battery cell 12 in thermal runaway. When the battery cell 12 is in normal operation and the temperature outside the battery cell 12 increases to the first threshold, the first pressure relief component 125 can melt to connect the inside and the outside of the battery cell 12 in normal operation.

[0186] The melting process is a relatively rapid physical change process, and thus actuating the first pressure relief component 125 by melting is conducive to improving the timeliness of actuation of the first pressure relief component 125.

[0187] In the above scheme, the first pressure relief component 125 is actuated by melting the first pressure relief component 125, which is conducive to timely pressure relief of the battery cell 12, and the risk of failure of the first pressure relief component 125 leading to the inability of the first pressure relief component 125 to actuate is relatively low, which is conducive to further improving the reliability of the battery cell 12.

[0188] According to some embodiments of the present application, referring to FIGS. 12-29, the first wall portion 121a has a first pressure relief hole 127, and the first pressure relief component 125 closes the first pressure relief hole 127.

[0189] The first pressure relief hole 127 can be integrally formed with the shell 121, or can be formed on the first wall portion 121a by machining or the like.

[0190] The shape of the first pressure relief hole 127 can be circular, polygonal, irregular, or the like. The first pressure relief hole 127 can extend along a straight line or can extend along a curve or a broken line.

[0191] The first pressure relief component 125 closes the first pressure relief hole 127, meaning that the first pressure relief component 125 can block the first pressure relief hole 127 so that the inside and the outside of the shell 121 are not directly connected through the first pressure relief hole 127. The first pressure relief component 125 can be arranged on the outer surface and / or the inner surface of the first wall portion 121a to cover the first pressure relief hole 127, or can be filled in the first pressure relief hole 127 to block the first pressure relief hole 127.

[0192] The first pressure relief component 125 can close one first pressure relief hole 127, or can simultaneously close multiple first pressure relief holes 127.

[0193] In the above scheme, the first pressure relief component 125 sealing the first pressure relief hole 127 is conducive to making the battery monomer 12 have higher sealing performance. After the first pressure relief component 125 is actuated, the first pressure relief hole 127 can form a pressure relief channel with a predetermined trajectory, which is conducive to making the pressure relief of the battery monomer 12 proceed in a predetermined direction, making the pressure relief of the battery monomer 12 more controllable, reducing the risk of a single battery monomer 12 thermal runaway triggering thermal runaway of the remaining battery monomers 12, thereby facilitating to improve the reliability of the battery 100. At the same time, the first pressure relief component 125 is arranged by sealing the first pressure relief hole 127, which has lower design and processing costs.

[0194] According to some embodiments of the present application, please refer to FIG. 3, FIG. 12, FIG. 26, FIG. 30 and FIG. 44, the first pressure relief hole 127 is provided in plurality, and the plurality of first pressure relief holes 127 are arranged in an array.

[0195] The plurality of first pressure relief holes 127 can be distributed in a circumferential array, or can be distributed along a rectangular array, or can be distributed along a predetermined trajectory array.

[0196] In order to make the pressure relief of the battery monomer 12 more smooth, it is generally necessary to make the pressure relief component have a larger pressure relief area. While having a larger pressure relief area, the plurality of first pressure relief holes 127 are designed in an array arrangement, which is conducive to reducing the area of a single first pressure relief hole 127, thereby facilitating to intercept the particulate matter inside the shell 121 after the thermal runaway of the battery monomer 12.

[0197] In the above scheme, the plurality of first pressure relief holes 127 are arranged in an array, which can reduce the risk of particulate matter igniting smoke on the one hand, and can reduce the risk of particulate matter piercing the remaining battery monomers 12 and triggering thermal runaway of the remaining battery monomers 12 on the other hand, thereby facilitating to further improve the reliability of the battery 100.

[0198] According to some embodiments of the present application, please refer to FIG. 12-FIG. 21, the first pressure relief hole 127 and the first pressure relief component 125 are provided in plurality, the plurality of first pressure relief holes 127 are arranged at intervals, the plurality of first pressure relief components 125 are arranged corresponding to the plurality of first pressure relief holes 127, and the first pressure relief component 125 seals the first pressure relief hole 127 corresponding thereto.

[0199] When one of the first pressure relief components 125 fails, for example, the temperature-sensitive unit thereof fails, etc., causing the first pressure relief component 125 to fail to actuate, the remaining first pressure relief components 125 will not be affected and can actuate normally.

[0200] In the above scheme, the first pressure relief component 125 closes the first pressure relief hole 127 corresponding to the first pressure relief component 125, which is conducive to reducing the risk that the battery monomer 12 cannot be reliably relieved due to the failure of one of the first pressure relief components 125, and improves the reliability of the battery monomer 12. At the same time, the first pressure relief component 125 closes the first pressure relief hole 127 corresponding to the first pressure relief component 125, which has relatively low design cost.

[0201] According to some embodiments of the present application, please refer to FIGS. 12-21, at least a part of the first pressure relief component 125 is located in the first pressure relief hole 127.

[0202] In some embodiments, please refer to FIG. 16, the first pressure relief component 125 can be filled into the first pressure relief hole 127 by injection molding.

[0203] In some embodiments, please refer to FIG. 21, the first pressure relief component 125 can also be filled into the first pressure relief hole by riveting, which can be riveted on the outer surface of the first wall portion 121a or the inner surface of the first wall portion 121a.

[0204] When a part of the first pressure relief component 125 is located in the first pressure relief hole 127, the remaining part of the first pressure relief component 125 can be outside the outer surface and / or the inner surface of the first wall portion 121a.

[0205] In the above scheme, the first pressure relief component 125 can share part of the space of the battery monomer 12 with the first wall portion 121a, which is conducive to improving the volume energy density of the battery monomer 12.

[0206] According to some embodiments of the present application, please refer to FIGS. 12-21, the first pressure relief component 125 is injection molded in the first pressure relief hole 127.

[0207] The material of the first pressure relief component 125 can include but is not limited to polypropylene, polyethylene, polyphenylene sulfide, etc.

[0208] Generally, the first pressure relief component 125 is injection molded in the first pressure relief hole 127 by injection molding, without the need to add a sealing member to seal the first pressure relief component 125 and the first pressure relief hole 127.

[0209] In the above scheme, the first pressure relief component 125 is molded in the first pressure relief hole 127 by injection molding, which has relatively low processing cost, and the risk of gap between the first pressure relief component 125 and the first pressure relief hole 127 is also relatively low, thereby being conducive to making the battery monomer 12 have relatively high sealing performance.

[0210] According to some embodiments of the present application, referring to FIGS. 12-21, the first pressure relief component 125 includes a main body portion 1251, a first limiting portion 1252, and a second limiting portion 1253, at least a portion of the main body portion 1251 is located in the first pressure relief hole 127. The first limiting portion 1252 and the second limiting portion 1253 are respectively connected to two ends of the main body portion 1251 along the thickness direction of the first wall portion 121a, the first limiting portion 1252 and the second limiting portion 1253 are both protruded from the outer circumferential surface of the main body, and a portion of the first wall portion 121a is located between the first limiting portion 1252 and the second limiting portion 1253.

[0211] In some embodiments, the first recess 128 and the second recess 129 can be arranged on the first wall portion 121a, the first pressure relief hole 127 penetrates the bottom wall of the first recess 128 and the second recess 129, and the first limiting portion 1252 and the second limiting portion 1253 can be formed in the first recess 128 and the second recess 129 by filling a portion of the first pressure relief component 125 into the first pressure relief hole 127 through injection molding.

[0212] In some embodiments, the first pressure relief component 125 can be sealed into the first pressure relief hole 127 by riveting, and the first limiting portion 1252 and the second limiting portion 1253 are formed during the riveting of the first pressure relief component 125 to the first wall portion 121a.

[0213] Along the thickness direction of the first wall, the first limiting portion 1252 and the second limiting portion 1253 can protrude from the surface of the first wall portion 121a, or can be located inside the first wall portion 121a.

[0214] The first limiting portion 1252 and the second limiting portion 1253 can make the main body portion 1251 more stable in combination with the first wall portion 121a, thereby improving the stability of the cooperation between the main body portion 1251 and the first pressure relief hole 127.

[0215] In the above scheme, the arrangement of the first limiting portion 1252 and the second limiting portion 1253 can reduce the risk of battery monomer 12 sealing failure caused by the gap between the main body portion 1251 and the first pressure relief hole 127, and also can reduce the assembly difficulty of the first pressure relief component 125.

[0216] According to some embodiments of the present application, referring to FIGS. 12-21, the outer surface of the first wall portion 121a is provided with the first recess 128, the inner surface of the first wall portion 121a is provided with the second recess 129, the first pressure relief hole 127 penetrates the bottom wall of the first recess 128 and the bottom wall of the second recess 129, at least a portion of the first limiting portion 1252 is located in the first recess 128, and at least a portion of the second limiting portion 1253 is located in the second recess 129.

[0217] The first recess 128 and the second recess 129 can be formed in the first wall portion 121a by injection molding or machining.

[0218] At least a portion of the first limiting portion 1252 is located in the first recess 128, and at least a portion of the second limiting portion 1253 is located in the second recess 129, which means that the first limiting portion 1252 and the second limiting portion 1253 can share part of the space with the first wall portion 121a.

[0219] In some embodiments, the first limiting portion 1252 is flush with the outer surface of the first wall portion 121a, and the second limiting portion 1253 is flush with the outer surface of the second wall portion 121b. This can reduce the risk of interference between the first pressure relief component 125 and other components in the battery 100, and is also conducive to improving the energy density of the battery cell 12.

[0220] In the above scheme, the provision of the first recess 128 and the second recess 129 is conducive to improving the volumetric energy density of the battery cell 12. At the same time, the first recess 128 and the second recess 129 can serve as an assembly base for the first pressure relief component 125, which is conducive to reducing the assembly difficulty of the first pressure relief component 125.

[0221] According to some embodiments of the present application, referring to FIGS. 12-21, the battery cell 12 further comprises a first sealing member 1210. The first sealing member 1210 is arranged between the first limiting portion 1252 and the bottom wall of the first recess 128 in the thickness direction of the first wall portion 121a, or the first sealing member 1210 is arranged between the second limiting portion 1253 and the bottom wall of the second recess 129.

[0222] Referring to FIG. 21, the first sealing member 1210 is arranged between the second limiting portion 1253 and the bottom wall of the second recess 129.

[0223] In some embodiments, the first pressure relief component 125 seals the first pressure relief hole 127 by riveting. Since the connection by riveting has a high risk of gaps between the first pressure relief component 125 and the first pressure relief hole 127, the provision of the first sealing member 1210 can significantly improve the sealing performance of the battery cell 12.

[0224] In the above scheme, the provision of the first sealing member 1210 can reduce the risk of gaps between the first wall portion 121a and the first pressure relief component 125 that communicate the inside of the shell 121 and the outside of the shell 121, which is conducive to improving the sealing performance of the battery cell 12.

[0225] According to some embodiments of the present application, referring to FIGS. 12-21, along the thickness direction of the first wall portion 121a, the first pressure relief component 125 has a first surface facing the interior of the shell 121 and a second surface facing away from the interior of the shell 121, the first pressure relief component 125 is provided with a third groove 1254, the third groove 1254 is recessed from the first surface to the second surface or the third groove 1254 is recessed from the second surface to the first surface.

[0226] In some embodiments, the third groove 1254 can be formed by the mold of injection molding.

[0227] In some embodiments, the third groove 1254 can be naturally formed after the rivet rivets the first pressure relief component 125 and the first wall portion 121a.

[0228] The provision of the third groove 1254 is equivalent to thinning the thickness of the partial area of the first pressure relief component 125 to some extent, so that the first pressure relief component 125 can be actuated more timely, for example, the time required for melting the first pressure relief component 125 is shorter. For example, the provision of the third groove 1254 makes it easier for heat to concentrate in the partial area of the first pressure relief component 125, so that the temperature-sensitive element can more timely detect the temperature inside the battery monomer 12.

[0229] In the above scheme, on the one hand, the heat of the part of the first pressure relief component 125 where the third groove 1254 is provided is easy to gather, and on the other hand, it is beneficial to improve the timeliness of the actuation of the first pressure relief component 125.

[0230] According to some embodiments of the present application, referring to FIGS. 22-29 and FIGS. 36-41, the first pressure relief hole 127 is provided with a plurality of first pressure relief holes 127, the plurality of first pressure relief holes 127 are arranged at intervals, and the first pressure relief component 125 closes the plurality of first pressure relief holes 127.

[0231] The first pressure relief component 125 closes the plurality of first pressure relief holes 127, which means that a single first pressure relief component 125 can close two or more first pressure relief holes 127, and of course, a single first pressure relief component 125 can also close all first pressure relief holes 127.

[0232] In some embodiments, two adjacent first pressure relief holes 127 are communicated through a channel, and after filling the above-mentioned two adjacent first pressure relief holes 127 at the same time by using the injection molding method, a single first pressure relief component 125 closes the two first pressure relief holes 127.

[0233] In the above scheme, since the first pressure relief component 125 encloses the plurality of first pressure relief holes 127, on one hand, after the first pressure relief component 125 starts to actuate, heat spreads inside the first pressure relief component 125, which is conducive to timely connecting the plurality of first pressure relief holes 127 to the inside and outside of the shell 121, thereby being conducive to improving the pressure relief efficiency of the battery monomer 12. On the other hand, it is conducive to reducing the overall mass of the battery monomer 12, thereby being conducive to improving the mass-energy density of the battery monomer 12. On the other hand, it is also conducive to simplifying the assembly process of the battery monomer 12 and improving the assembly efficiency of the battery monomer 12.

[0234] According to some embodiments of the present application, please refer to FIGS. 22-29 and 36-41, the first wall portion 121a has a fourth groove 1213, the fourth groove 1213 is arranged on the outer surface or the inner surface of the first wall portion 121a, the first pressure relief hole 127 is arranged on the bottom wall of the fourth groove 1213, and at least part of the first pressure relief component 125 is accommodated in the fourth groove 1213.

[0235] The at least part of the first pressure relief component 125 is accommodated in the fourth groove 1213, which means that the first pressure relief component 125 can share part of the space with the first wall portion 121a.

[0236] Please refer to FIGS. 22-25, the fourth groove 1213 is arranged on the inner surface of the first wall portion 121a.

[0237] Please refer to FIGS. 26-29, the fourth groove 1213 is arranged on the outer surface of the first wall portion 121a.

[0238] In the above scheme, it is conducive to improving the volume-energy density of the battery monomer 12. At the same time, the fourth groove 1213 can serve as an assembly base of the first pressure relief component 125, which is conducive to reducing the assembly difficulty of the first pressure relief component 125.

[0239] According to some embodiments of the present application, please refer to FIGS. 22-29 and 36-41, the battery monomer 12 further comprises a first fixing member 1214 connected to the first wall portion 121a, along the thickness direction of the first wall portion 121a, part of the first pressure relief component 125 is located between the first fixing member 1214 and the bottom wall of the fourth groove 1213, and the first fixing member 1214 is configured to fix the first pressure relief component 125 in the fourth groove 1213.

[0240] The first fixing member 1214 can be provided in multiple, and a part of the first fixing member 1214 is connected to the first pressure relief component 125, and a part of the first fixing member 1214 is connected to the bottom wall of the fourth groove 1213, so as to fix the first pressure relief component 125 in the fourth groove 1213. The first fixing member 1214 can also be provided in one, for example, the first fixing member 1214 can be cross-shaped, ring-shaped, zigzag-shaped, etc. to press the first pressure relief component 125 to the bottom wall of the fourth groove 1213.

[0241] In some embodiments, the first fixing member 1214 can be flush with the surface of the first wall portion 121a.

[0242] In some embodiments, the first fixing member 1214 can protrude from the surface of the first wall portion 121a.

[0243] In some embodiments, the first fixing member 1214 can be located entirely within the fourth groove 1213.

[0244] The material of the first fixing member 1214 can be the same as or different from the material of the first wall portion 121a. The material of the first fixing member 1214 can include, but is not limited to, copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0245] In some embodiments, the first fixing member 1214 is welded to the first wall portion 121a.

[0246] In some embodiments, the first fixing member 1214 can be connected to the first wall portion 121a by a fastener.

[0247] In some embodiments, the first fixing member 1214 can be adhered to the surface of the first wall portion 121a.

[0248] In the above scheme, the provision of the first fixing member 1214 can improve the connection strength of the first pressure relief component 125 and the fourth groove 1213, which is beneficial to reduce the deformation of the first pressure relief component 125, thereby reducing the risk of a gap between the first pressure relief hole 127 and the first pressure relief component 125 that communicates the inside and outside of the housing 121, and improving the sealing performance of the battery monomer 12.

[0249] According to some embodiments of the present application, please refer to FIGS. 22-29 and 36-41, the first fixing member 1214 is ring-shaped.

[0250] The first fixing member 1214 can be a circular ring or a polygonal ring.

[0251] The ring-shaped first fixing member 1214 can make the force received by the first pressure relief component 125 more evenly distributed after fixing the first pressure relief component 125, which is beneficial to improve the structural stability of the first pressure relief component 125 and improve the service life of the first pressure relief component 125.

[0252] Compared with the non-ring-shaped first fixing member 1214, the inner ring side of the first fixing member 1214 can be left with a certain space, for example, the inner ring side of the first fixing member 1214 can also accommodate part of the first pressure relief component 125, which is conducive to improving the energy density of the battery monomer 12.

[0253] In the above scheme, the shape of the first fixing member 1214 is set to be ring-shaped, which is conducive to reducing the space occupied by the first fixing member 1214 while making the first pressure relief component 125 and the first wall part 121a have higher connection strength, and is conducive to improving the volume energy density of the battery monomer 12. At the same time, the ring-shaped first fixing member 1214 can also reduce the risk of the first fixing member 1214 blocking the first pressure relief hole 127 when the battery monomer 12 is in thermal runaway.

[0254] According to some embodiments of the present application, please refer to FIGS. 22-29 and 36-41, the outer peripheral surface of the first fixing member 1214 is connected with the side wall of the fourth groove 1213.

[0255] The inner side of the fourth groove 1213 can function to pre-position the first fixing member 1214, thereby reducing the assembly difficulty of the first fixing member 1214 and improving the assembly efficiency thereof.

[0256] The outer peripheral surface of the first fixing member 1214 is connected with the side wall of the fourth groove 1213, which means that part of the first fixing member 1214 will be accommodated in the fourth groove 1213.

[0257] In the above scheme, at least part of the first fixing member 1214 can be accommodated in the fourth groove 1213, which can make the first fixing member 1214 and the first wall part 121a jointly occupy part of the space, and is conducive to improving the volume energy density of the battery monomer 12.

[0258] According to some embodiments of the present application, please refer to FIGS. 22-29 and 36-41, the battery monomer 12 further comprises a second sealing member 1215, which is located between the first pressure relief component 125 and the bottom wall of the fourth groove 1213 along the thickness direction of the first wall part 121a, and the second sealing member 1215 is arranged around the plurality of first pressure relief holes 127.

[0259] In the embodiment in which the first fixing member 1214 fixes the first pressure relief component 125, the risk of a gap occurring between the first pressure relief component 125 and the first wall part 121a is higher, and the arrangement of the second sealing member 1215 can significantly improve the sealing performance of the battery monomer 12.

[0260] The second seal 1215 is arranged around the plurality of first pressure relief holes 127, meaning that the arrangement of the second seal 1215 can reduce the risk of foreign matter flowing into or out of the battery cell 12 through the joint position of the first pressure relief holes 127, the first pressure relief member 125, and the first wall portion 121a.

[0261] In the above scheme, the arrangement of the second seal 1215 can reduce the risk of a gap occurring between the first pressure relief member 125 and the bottom wall of the fourth groove 1213, thereby facilitating improvement of the sealing performance of the battery cell 12.

[0262] According to some embodiments of the present application, referring to FIGS. 30-35, the first wall portion 121a and the second wall portion 121b are located on the same wall of the housing 121, the second wall portion 121b is provided with a second pressure relief hole 1216, and the second pressure relief member 126 is mounted to the second pressure relief hole 1216. The plurality of first pressure relief holes 127 are arranged around the second pressure relief hole 1216.

[0263] The first wall portion 121a and the second wall portion 121b are located on the same wall of the housing 121, and the second wall portion 121b is provided with a second pressure relief hole 1216, meaning that the first pressure relief holes 127 and the second pressure relief hole 1216 are arranged on the same wall of the housing 121, for example, the first pressure relief holes 127 and the second pressure relief hole 1216 are both arranged on the end cover 1211.

[0264] The second pressure relief hole 1216 can be integrally formed with the housing 121, or can be formed on the first wall portion 121a by machining or other methods.

[0265] The second pressure relief hole 1216 can have a circular shape, a polygonal shape, a special shape, or the like. The second pressure relief hole 1216 can extend along a straight line or can extend along a curve or a broken line.

[0266] The second pressure relief member 126 is mounted to the second pressure relief hole 1216, meaning that the second pressure relief member 126 can block the second pressure relief hole 1216 so that the inside and outside of the housing 121 are not directly connected through the second pressure relief hole 1216. The second pressure relief member 126 can be arranged on the outer surface and / or the inner surface of the first wall portion 121a to cover the second pressure relief hole 1216.

[0267] In some embodiments, the second pressure relief hole 1216 includes a first hole section and a second hole section connected in sequence, a joint position of the first hole section and the second hole section forms a stepped surface, and the second pressure relief member 126 is arranged on the stepped surface.

[0268] The plurality of first pressure relief holes 127 are arranged around the second pressure relief hole 1216, meaning that when the discharge passes through the second pressure relief hole 1216, the heat carried by the discharge is more likely to spread to the vicinity of the first pressure relief holes 127, so that the first pressure relief member 125 can be opened in time.

[0269] In the above scheme, the first pressure relief component 125 and the second pressure relief component 126 are arranged on a wall of the shell 121 simultaneously. After the second pressure relief component 126 is actuated, the discharge is discharged from the shell 121 through the second pressure relief hole 1216, and at the same time, part of the heat carried by the discharge can be transferred to the first pressure relief component 125 through the wall of the shell 121, so that the first pressure relief component 125 can be opened in time, which is beneficial to further improve the reliability of the battery monomer 12.

[0270] According to some embodiments of the present application, please refer to FIGS. 30-35, the first pressure relief component 125 is provided with a first through hole 1255, and the projection of the second pressure relief component 126 at least partially overlaps the first through hole 1255 along the thickness direction of the second wall 121b.

[0271] The projection of the second pressure relief component 126 at least partially overlaps the first through hole 1255, which means that when the second pressure relief component 126 is actuated, the discharge is discharged from the shell 121 through the first through hole 1255 and the second pressure relief hole 1216. Reducing the risk that the first pressure relief component 125 blocks the second pressure relief hole 1216 and causes the second pressure relief component 126 to be unable to relieve pressure. At the same time, it also means that a through hole can be a pressure relief channel for the second pressure relief component 126, that is, the pressure relief channel required by the second pressure relief component 126 to relieve pressure shares part of the space with the first pressure relief component 125.

[0272] The first through hole 1255 can be arranged at any position of the first pressure relief component 125, for example, in some embodiments, the first through hole 1255 is located at the center of the first pressure relief component 125. For example, in some other embodiments, the first through hole 1255 extends to the edge of the first pressure relief component 125 to form a notch.

[0273] In the above scheme, the arrangement of the first through hole 1255 is beneficial to improve the volume energy density of the battery monomer 12. At the same time, after the discharge flows through the first through hole 1255, part of the heat carried by the discharge can be quickly diffused on the first pressure relief component 125, so that more first pressure relief holes 127 can be connected between the inside and the outside of the shell 121 in time, which is beneficial to make the first pressure relief component 125 open in time.

[0274] According to some embodiments of the present application, please refer to FIGS. 30-35, the second wall 121b has a first boss 1220, the first boss 1220 protrudes from the outer surface or the inner surface of the second wall 121b, the first boss 1220 is arranged around the second pressure relief hole 1216, and the first pressure relief component 125 is sleeved on the outer circumferential surface of the first boss 1220 through the first through hole 1255.

[0275] The cross-sectional shape of the first boss 1220 can be a circular ring, a polygonal ring, etc.

[0276] In some embodiments, the first boss 1220 can be formed by machining an annular groove in the second wall portion 121b.

[0277] In some embodiments, the wall of the shell 121 in which the first wall portion 121a and the second wall portion 121b are located has a fourth groove 1213. Hereinafter, the wall of the shell 121 in which the first wall portion 121a and the second wall portion 121b are located is referred to as a first wall portion 121a. The fourth groove 1213 is provided on the outer surface or the inner surface of the first wall portion 121a. The first pressure relief hole 127 is provided in the bottom wall of the fourth groove 1213. At least a portion of the first pressure relief member 125 is accommodated in the fourth groove 1213. The first pressure relief member 125 is provided with a first through hole 1255. The bottom wall of the fourth groove 1213 is provided with a first boss 1220. The first boss 1220 protrudes from the bottom wall of the fourth groove 1213. The first boss 1220 is arranged around the second pressure relief hole 1216. The first pressure relief member 125 is sleeved on the outer circumferential surface of the first boss 1220 through the first through hole 1255.

[0278] In the above scheme, the first boss 1220 can serve as an assembly base of the first pressure relief member 125, thereby reducing the assembly difficulty of the first pressure relief member 125.

[0279] According to some embodiments of the present application, referring to FIGS. 30-35, the battery monomer 12 further comprises a second fixing member 1217 connected to the outer circumferential surface of the first boss 1220. Along the thickness direction of the second wall portion 121b, a portion of the first pressure relief member 125 is located between the second fixing member 1217 and the second wall portion 121b. The second fixing member 1217 is configured to fix the first pressure relief member 125 to the second wall portion 121b.

[0280] The second fixing member 1217 can be provided in multiple numbers. A portion of the second fixing member 1217 is connected to the first pressure relief member 125, and a portion of the second fixing member 1217 is connected to the outer circumferential surface of the first boss, thereby fixing the first pressure relief member 125 to the outer circumferential surface of the first boss 1220. The second fixing member 1217 can also be provided in one number. For example, the second fixing member 1217 can be annular to press the first pressure relief member 125 against the second wall portion 121b.

[0281] In some embodiments, the second fixing member 1217 can be flush with the surface of the first wall portion 121a.

[0282] In some embodiments, the second fixing member 1217 can protrude beyond the surface of the first wall portion 121a.

[0283] In some embodiments, referring to FIG. 33, the second fixing member 1217 can be located entirely within the fourth groove 1213.

[0284] The material of the second fixing member 1217 can be the same as or different from the material of the first wall portion 121a. The material of the second fixing member 1217 can include, but is not limited to, copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0285] In some embodiments, the second fixing member 1217 is welded to the first boss 1220.

[0286] In some embodiments, the second fixing member 1217 can be connected to the first boss 1220 by a fastener.

[0287] In some embodiments, the second fixing member 1217 can be adhered to the outer circumferential surface of the first boss 1220.

[0288] In some embodiments, referring to FIGS. 33 and 35, the wall of the housing 121 in which the first wall portion 121a and the second wall portion 121b are located has a fourth groove 1213, which is described below with the first wall portion 121a instead of the wall of the housing 121 in which the first wall portion 121a and the second wall portion 121b are located. The fourth groove 1213 is provided on the outer surface or the inner surface of the first wall portion 121a. The first pressure relief hole 127 is provided on the bottom wall of the fourth groove 1213. At least a portion of the first pressure relief member 125 is accommodated in the fourth groove 1213. The first pressure relief member 125 is provided with a first through hole 1255, which allows the first pressure relief member 125 to have an inner edge. The bottom wall of the fourth groove 1213 is provided with a first boss 1220, which protrudes from the bottom wall of the fourth groove 1213. The first boss 1220 is arranged around the second pressure relief hole 1216. The first pressure relief member 125 is sleeved on the outer circumferential surface of the first boss 1220 through the first through hole 1255. The second fixing member 1217 is connected to the outer circumferential surface of the first boss 1220. In the thickness direction of the second wall portion 121b, a portion of the first pressure relief member 125 is located between the second fixing member 1217 and the second wall portion 121b. The second fixing member 1217 is configured to fix the first pressure relief member 125 to the second wall portion 121b. In other embodiments, in the thickness direction of the first wall portion 121a, at least a portion of the second fixing member 1217 is located within the fourth groove 1213. In yet other embodiments, the battery cell 12 further includes a first fixing member 1214. The outer circumferential surface of the first fixing member 1214 is connected to the side wall of the fourth groove 1213. In the thickness direction of the first wall portion 121a, a portion of the first pressure relief member 125 is located between the first fixing member 1214 and the bottom wall of the fourth groove 1213. The first fixing member 1214 is configured to fix the first pressure relief member 125 within the fourth groove 1213. In still other embodiments, the first fixing member 1214 is located near the outer edge of the first pressure relief member 125, and the second fixing member 1217 is located near the inner edge of the first pressure relief member 125.

[0289] In the scheme, the second fixing member 1217 can improve the connection strength between the first pressure relief component 125 and the second wall portion 121b, and facilitate to reduce the deformation of the first pressure relief component 125, and reduce the risk of the first pressure relief hole 127 and the first pressure relief component 125 being connected to form a gap for connecting the inside and outside of the shell 121, and improve the sealing performance of the battery monomer 12.

[0290] According to some embodiments of the present application, please refer to FIGS. 30-35, the second fixing member 1217 is annular.

[0291] The second fixing member 1217 can be a circular ring or a polygonal ring.

[0292] The annular second fixing member 1217 can make the force on the first pressure relief component 125 more evenly distributed after fixing the first pressure relief component 125, and facilitate to improve the structural stability of the first pressure relief component 125 and improve the service life of the first pressure relief component 125.

[0293] Compared with the non-annular second fixing member 1217, the inner ring side of the second fixing member 1217 can be left with a certain space, for example, the inner ring side of the second fixing member 1217 can leave a space for assembling the first boss 1220, and facilitate to improve the energy density of the battery monomer 12.

[0294] In the scheme, the shape of the second fixing member 1217 is annular, which can improve the connection strength between the first pressure relief component 125 and the second wall portion 121b, and facilitate to reduce the space occupied by the second fixing member 1217, and improve the volume energy density of the battery monomer 12. At the same time, the annular second fixing member 1217 can also reduce the risk of blocking the second pressure relief hole 1216 by the second fixing member 1217 when the battery monomer 12 is in thermal runaway.

[0295] According to some embodiments of the present application, please refer to FIGS. 30-35, the outer circumferential surface of the second fixing member 1217 is connected with the outer circumferential surface of the first boss 1220.

[0296] The outer circumferential surface of the first boss 1220 can function as a positioning base for the second fixing member 1217, thereby reducing the assembly difficulty of the second fixing member 1217 and improving the assembly efficiency.

[0297] In the scheme, the second fixing member 1217 and the first boss 1220 jointly occupy part of the space, which facilitates to improve the volume energy density of the battery monomer 12. Moreover, the outer circumferential surface of the first boss 1220 can serve as an assembly base for the second fixing member 1217, which makes the positioning of the second fixing member 1217 more convenient and facilitates to improve the assembly efficiency of the second fixing member 1217.

[0298] According to some embodiments of the present application, referring to FIGS. 30-35, the battery cell 12 further includes a third seal 1218 disposed around the first through hole 1255 between the first pressure relief component 125 and the second wall portion 121b in the thickness direction of the second wall portion 121b.

[0299] In some embodiments, the wall of the housing 121 in which the first wall portion 121a and the second wall portion 121b are located has a fourth recess 1213, which is described below with respect to the first wall portion 121a instead of the wall of the housing 121 in which the first wall portion 121a and the second wall portion 121b are located. The fourth recess 1213 is disposed on an outer surface or an inner surface of the first wall portion 121a. The first pressure relief hole 127 is disposed on a bottom wall of the fourth recess 1213. At least a portion of the first pressure relief component 125 is received in the fourth recess 1213. The first pressure relief component 125 is provided with the first through hole 1255, which causes the first pressure relief component 125 to have an inner edge. The bottom wall of the fourth recess 1213 is provided with a first boss 1220 that protrudes from the bottom wall of the fourth recess 1213. The first boss 1220 is disposed around the second pressure relief hole 1216. The first pressure relief component 125 is sleeved on an outer peripheral surface of the first boss 1220 through the first through hole 1255. The second fixing member 1217 is connected to the outer peripheral surface of the first boss 1220. A portion of the first pressure relief component 125 is located between the second fixing member 1217 and the second wall portion 121b in the thickness direction of the second wall portion 121b. The second fixing member 1217 is configured to fix the first pressure relief component 125 to the second wall portion 121b. In other embodiments, at least a portion of the second fixing member 1217 is located within the fourth recess 1213 in the thickness direction of the first wall portion 121a. In still other embodiments, the battery cell 12 further includes a first fixing member 1214. An outer peripheral surface of the first fixing member 1214 is connected to a side wall of the fourth recess 1213. A portion of the first pressure relief component 125 is located between the first fixing member 1214 and the bottom wall of the fourth recess 1213 in the thickness direction of the first wall portion 121a. The first fixing member 1214 is configured to fix the first pressure relief component 125 within the fourth recess 1213. In yet other embodiments, the first fixing member 1214 is located near an outer edge of the first pressure relief component 125, and the second fixing member 1217 is located near an inner edge of the first pressure relief component 125. In still other embodiments, the third seal 1218 is disposed between the bottom wall of the fourth recess 1213 and the first pressure relief component 125 and around the first boss 1220.

[0300] In some embodiments, the first pressure relief component 125 is provided with a first through hole 1255, and a projection of the second pressure relief component 126 overlaps with the first through hole 1255 at least partially along a thickness direction of the second wall portion 121b. The third seal 1218 can reduce the risk of the internal and external of the battery 100 being communicated through the first through hole 1255, which can cause the battery cell 12 to fail in sealing.

[0301] In the above scheme, the third seal 1218 can reduce the risk of a gap occurring between the first pressure relief component 125 and the second wall portion 121b, which is conducive to improving the sealing performance of the battery cell 12.

[0302] According to some embodiments of the present application, the area of the first pressure relief hole 127 is S1, which satisfies: 1mm 2 ≤ S1 ≤ 100mm 2 .

[0303] The area of the first pressure relief hole 127 can be any value greater than or equal to 1mm 2 and less than or equal to 100mm 2 , for example, 1mm 2 , 5mm 2 , 10mm 2 , 15mm 2 , 20mm 2 , 25mm 2 , 30mm 2 , 35mm 2 , 40mm 2 , 45mm 2 , 50mm 2 , 55mm 2 , 60mm 2 , 65mm 2 , 70mm 2 , 75mm 2 , 80mm 2 , 85mm 2 , 90mm 2 , 95mm 2 , or 100mm 2 .

[0304] In the above scheme, when S1 ≥ 1mm 2 , the first pressure relief hole 127 can have a larger area, so that the first pressure relief component 125 has a larger pressure relief area, which is conducive to improving the pressure relief efficiency of the battery cell 12; when S1 ≤ 100mm 2 , the first wall portion 121a can have higher structural stability, which is conducive to improving the reliability of the battery cell 12. Therefore, when 1mm 2When S1≥2mm

[0305] According to some embodiments of the present application, 2mm 2 ≤S1≤50mm 2 .

[0306] The area of the first pressure relief hole 127 can be any value between 2mm 2 and 50mm 2 inclusive, for example, 2mm 2 , 4mm 2 , 6mm 2 , 8mm 2 , 10mm 2 , 12mm 2 , 14mm 2 , 16mm 2 , 18mm 2 , 20mm 2 , 22mm 2 , 24mm 2 , 26mm 2 , 28mm 2 , 30mm 2 , 32mm 2 , 34mm 2 , 36mm 2 , 38mm 2 , 40mm 2 , 42mm 2 , 44mm 2 , 46mm 2 , 48mm 2 , or 50mm 2 .

[0307] In the above scheme, when S1≥2mm 2 , the area of the first pressure relief hole 127 can be further increased, which is conducive to further improving the pressure relief efficiency of the battery monomer 12; when S1≤50mm 2 , the structural stability of the first wall portion 121a can be further improved, which is conducive to further improving the reliability of the battery monomer 12, therefore, when 2mm 2 ≤S1≤50mm 2 , the battery monomer 12 can further improve the pressure relief efficiency while further improving its reliability.

[0308] According to some embodiments of the present application, please refer to FIGS. 8-11, the second pressure relief component 126 includes a body and a filter 1219, the body has an opening area, the filter 1219 is arranged on the side of the opening area facing the inside of the shell 121, and the filter 1219 is used to divide the opening area into multiple sub-areas.

[0309] The opening area can be defined by a notch provided on the body, that is, when the internal pressure of the battery cell reaches the second threshold value, the area surrounded by the boundary of the area surrounded by the notch in the body is opened, which is the opening area. The opening area can also be defined by an area in the body with a lower thickness than other parts, or by an area in the body with a lower melting point than other parts. It can also be understood that the opening area is defined by a weak part in the second pressure relief component 126, for example, when the internal pressure of the battery cell 12 reaches the second threshold value, the weak part will crack to connect the inside and outside of the shell 121 to discharge the discharge material out of the battery cell 12. In some examples, please refer to FIGS. 4-7, the outer surface of the second pressure relief component 126 can be provided with a groove, and the bottom wall of the groove forms a weak part, and when the pressure reaches the second threshold value, the bottom wall of the groove is relatively thin and is more prone to breakage.

[0310] The material of the filter 1219 can be the same as or different from the shell 121.

[0311] The material of the filter 1219 can include but is not limited to copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0312] The filter 1219 can be in a grid shape, or can be configured as a plurality of non-intersecting bars.

[0313] The filter 1219 can be connected to the body by welding, bonding, fasteners, etc.

[0314] In some embodiments, please refer to FIG. 8, the provision of the filter 1219 can divide the relatively large opening area into a plurality of relatively small sub-areas, thereby facilitating the interception of relatively large particles in the discharge material into the shell 121, and allowing the high-temperature and high-pressure gas to be discharged from the sub-areas and the second pressure relief hole 1216 to the outside of the shell 121 more smoothly.

[0315] In some embodiments, please refer to FIG. 11, a gap is provided between the filter 1219 and the body along the thickness direction of the second wall portion 121b, meaning that to some extent, the discharge of gas by the filter 1219 will not interfere, that is, the area for discharging gas from the inside of the shell 121 to the outside of the shell 121 will not be reduced.

[0316] In the above scheme, the provision of the filter 1219 can allow the battery cell 12 to have a relatively high pressure relief area while facilitating the interception of particles after thermal runaway of the battery cell 12 into the shell 121, which can reduce the risk of particles igniting smoke, and can reduce the risk of particles piercing the remaining battery cells 12 and causing thermal runaway of the remaining battery cells 12, thereby further improving the reliability of the battery 100.

[0317] According to some embodiments of the present application, referring to FIG. 8-11, the second pressure relief component 126 is provided with a fifth groove 1261 on the side facing the interior of the shell 121, a bottom wall 12121 of the fifth groove 1261 forms an opening area, at least a part of the filter piece 1219 is accommodated in the fifth groove 1261, and the filter piece 1219 is connected to the side wall of the fifth groove 1261.

[0318] The fifth groove 1261 can be machined together with the second wall portion 121b, for example, by casting or the like. It can also be machined separately from the second wall portion 121b, for example, by machining or the like.

[0319] At least a part of the filter piece 1219 is accommodated in the fifth groove 1261, which means that the filter piece 1219 can share part of the space with the fifth groove 1261.

[0320] In the above scheme, at least a part of the filter piece 1219 is accommodated in the fifth groove 1261, which is conducive to reducing the volumetric energy density of the battery monomer 12, and the side wall of the fifth groove 1261 can serve as an assembly base for the filter piece 1219, which is conducive to simplifying the assembly difficulty of the filter piece 1219 and improving the assembly efficiency of the battery monomer 12.

[0321] According to some embodiments of the present application, the area of the sub-area is S2, which satisfies: 1mm 2 ≤S2≤400mm 2 .

[0322] The area of the sub-area can be any value between 1mm 2 and 400mm 2 , for example, 1mm 2 , 10mm 2 , 20mm 2 , 30mm 2 , 40mm 2 , 50mm 2 , 60mm 2 , 70mm 2 , 80mm 2 , 90mm 2 , 100mm 2 , 110mm 2 , 120mm 2 , 130mm 2 , 140mm 2 , 150mm 2 , 160mm 2 , 170mm 2 , 180mm 2 , 190mm 2 , 200mm2 210mm 2 220mm 2 230mm 2 240mm 2 250mm 2 260mm 2 270mm 2 280mm 2 290mm 2 300mm 2 310mm 2 320mm 2 330mm 2 340mm 2 350mm 2 360mm 2 370mm 2 380mm 2 390mm 2 400mm 2 .

[0323] In the above scheme, when S2≥1mm 2 , the sub-area has a larger area, so that the second pressure relief component 126 has a larger pressure relief area, which is beneficial to improve the pressure relief efficiency of the battery monomer 12; when S2≤400mm2, it is beneficial to intercept the relatively small volume of particulate matter inside the shell 121, thereby reducing the risk of particulate matter spewing out of the shell 1211 to cause thermal runaway of the remaining battery monomers 12 and ignite the smoke, and improving the reliability of the battery monomer 12, therefore, when 1mm 2 ≤S2≤400mm 2 , the battery monomer 12 can have both high pressure relief efficiency and high reliability.

[0324] According to some embodiments of the present application, 2mm 2 ≤S2≤200mm 2 .

[0325] The area of the sub-area can be any value between 2mm 2 and 200mm 2 , for example, 2mm 2 , 5mm 2 , 10mm 2 , 15mm 2 , 20mm 2 , 25mm 2 , 30mm 2 , 35mm 2 , 40mm 2 , 45mm 250mm 2 55mm 2 60mm 2 65mm 2 70mm 2 75mm 2 80mm 2 85mm 2 90mm 2 95mm 2 100mm 2 105mm 2 110mm 2 115mm 2 120mm 2 125mm 2 130mm 2 135mm 2 140mm 2 145mm 2 150mm 2 155mm 2 160mm 2 165mm 2 170mm 2 175mm 2 180mm 2 185mm 2 190mm 2 195mm 2 200mm 2 .

[0326] In the above scheme, when S2≥2mm 2 , the area of the sub-region can be further increased, so that the second pressure relief component 126 has a larger pressure relief area, which is beneficial to further improve the pressure relief efficiency of the battery monomer 12; when S2≤200mm 2 , it is beneficial to intercept the smaller particles inside the shell 121, thereby further reducing the risk of particles spraying out of the shell 121 to cause thermal runaway of the remaining battery monomers 12 and ignite the smoke, and improving the reliability of the battery monomer 12. Therefore, when 2mm 2 ≤S2≤200mm 2 , the battery monomer 12 can further improve the pressure relief efficiency while further reducing the risk of particles spraying out of the shell 121 to cause thermal runaway of the remaining battery monomers 12 and ignite the smoke.

[0327] According to some embodiments of the present application, the first threshold value is T, which satisfies: 95℃≤T≤300℃.

[0328] The first threshold value can be any value between 95 DEG C and 300 DEG C, for example, 95 DEG C, 100 DEG C, 105 DEG C, 110 DEG C, 115 DEG C, 120 DEG C, 125 DEG C, 130 DEG C, 135 DEG C, 140 DEG C, 145 DEG C, 150 DEG C, 155 DEG C, 160 DEG C, 165 DEG C, 170 DEG C, 175 DEG C, 180 DEG C, 185 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 205 DEG C, 210 DEG C, 215 DEG C, 220 DEG C, 225 DEG C, 230 DEG C, 235 DEG C, 240 DEG C, 245 DEG C, 250 DEG C, 255 DEG C, 260 DEG C, 265 DEG C, 270 DEG C, 275 DEG C, 280 DEG C, 285 DEG C, 290 DEG C, 295 DEG C, or 300 DEG C.

[0329] According to some embodiments of the present application, the second threshold value is P, satisfying: 0.3 MPa≤P≤2.3 MPa.

[0330] The second threshold value can be any value between 0.3 MPa and 2.3 MPa, for example, 0.3 MPa, 0.6 MPa, 0.9 MPa, 1.2 MPa, 1.5 MPa, 1.8 MPa, or 2.3 MPa.

[0331] According to some embodiments of the present application, referring to FIGS. 42 and 43, the shell 121 includes a housing 1212 and an end cover 1211, the housing 1212 includes a bottom wall 12121 and a side wall surrounding the bottom wall 12121, one end of the side wall is connected to the bottom wall 12121, the other end of the side wall surrounds an opening, and the end cover 1211 is used to cover the opening. The end cover 1211 is provided with a first pressure relief component 125 and a second pressure relief component 126.

[0332] In some embodiments, the electrode terminal 123 is also provided on the end cover 1211, and the number of end covers 1211 is two, and the two electrode terminals 123 are arranged at intervals. In other embodiments, the first pressure relief component 125 and the second pressure relief component 126 are arranged between the two electrode terminals 123.

[0333] The end cover 1211 is generally plate-shaped, and the deformation caused by the installation of the first pressure relief component 125 and the second pressure relief component 126 is small, and the first pressure relief component 125 and the second pressure relief component 126 can be installed on the end cover 1211 first, and then the end cover 1211 is used to close the opening of the housing 1212, and the assembly difficulty is relatively low.

[0334] In the above scheme, the first pressure relief component 125 and the second pressure relief component 126 are arranged on the end cover 1211, which is convenient to process, and the assembly difficulty of the first pressure relief component 125 and the second pressure relief component 126 is also relatively low.

[0335] According to some embodiments of the present application, referring to Figs. 44 and 45, the bottom wall 12121 is provided with the first pressure relief component 125.

[0336] The bottom wall 12121 is also provided with the first pressure relief component 125, meaning that the pressure relief area of the battery monomer 12 is further increased when the temperature inside or outside the battery monomer 12 reaches the second threshold value.

[0337] In the above scheme, since the bottom wall 12121 is also provided with the first pressure relief component 125, the pressure relief area of the battery monomer 12 can be further increased, and the pressure relief efficiency of the battery monomer 12 can be improved.

[0338] According to some embodiments of the present application, referring to Figs. 46 and 47, the shell 121 includes a shell body 1212 and an end cover 1211, the shell body 1212 includes a bottom wall 12121 and a side wall surrounding the bottom wall 12121, one end of the side wall is connected to the bottom wall 12121, and the other end of the side wall surrounds an opening, and the end cover 1211 is used to cover the opening. The end cover 1211 is provided with the second pressure relief component 126, and the bottom wall 12121 is provided with the first pressure relief component 125.

[0339] The second pressure relief component 126 and the first pressure relief component 125 are arranged on two different walls of the shell 121, which is beneficial to improve the overall structural strength of the shell 121, and at the same time, the area of the region of the shell 121 for arranging the second pressure relief component 126 and the first pressure relief component 125 is larger, and the assembly difficulty is lower.

[0340] Since the bottom wall 12121 and the end cover 1211 are arranged oppositely, the discharge material can be discharged outward along a straight line, which is beneficial to reduce the risk of excessive deformation of the shell 121.

[0341] In the above scheme, the second pressure relief component 126 and the first pressure relief component 125 are arranged on the end cover 1211 and the bottom wall 12121 respectively, which simplifies the assembly difficulty of the first pressure relief component 125 and the second pressure relief component 126, and can also improve the structural strength of the end cover 1211 to some extent.

[0342] According to some embodiments of the present application, referring to Figs. 48 and 49, the shell 121 includes a shell body 1212 and an end cover 1211, the shell body 1212 includes a bottom wall 12121 and a side wall surrounding the bottom wall 12121, one end of the side wall is connected to the bottom wall 12121, and the other end of the side wall surrounds an opening, and the end cover 1211 is used to cover the opening. The end cover 1211 is provided with the first pressure relief component 125, and the bottom wall 12121 is provided with the second pressure relief component 126.

[0343] In some embodiments, two electrode terminals 123 are further arranged on the end cover 1211, and the plurality of first pressure relief components 125 are arranged between the two electrode terminals 123. The arrangement of the two electrode terminals 123 can improve the structural strength of the end cover 1211, and thus the end cover 1211 with the plurality of first pressure relief components 125 can still have high strength.

[0344] In the above scheme, the second pressure relief component 126 and the first pressure relief component 125 are arranged on the end cover 1211 and the bottom wall 12121 respectively, which simplifies the assembly difficulty of the first pressure relief component 125 and the second pressure relief component 126. Meanwhile, the arrangement of the first pressure relief component 125 on the end cover 1211 can make the shell 1212 have high structural strength.

[0345] According to some embodiments of the present application, referring to FIGS. 50-53, the shell 121 includes a shell 1212, a first end cover 12126, and a second end cover 12127. The shell 1212 includes a third side wall 12122 and a fourth side wall 12123 arranged opposite along a third direction Z, and a first side wall 12124 and a second side wall 12125 arranged opposite along a second direction Y. The third side wall 12122, the fourth side wall 12123, the first side wall 12124, and the second side wall 12125 enclose a containing cavity with a first opening and a second opening. The first opening and the second opening are arranged opposite along a first direction X. The first end cover 12126 is used to close the first opening, and the second end cover 12127 is used to close the second opening. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The third side wall 12122 is provided with the second pressure relief component 126, and the first end cover 12126 and the second end cover 12127 are both provided with the first pressure relief component 125.

[0346] In other embodiments, the third side wall 12122 is provided with the first pressure relief component 125 and the second pressure relief component 126.

[0347] The first pressure relief component 125 can be pre-arranged on the first end cover 12126 and the second end cover 12127. After the first end cover 12126 closes the first opening and the second end cover 12127 closes the second opening, the assembly difficulty is relatively low.

[0348] In some embodiments, the battery monomer 12 further includes two electrode terminals 123. One of the two electrode terminals 123 is arranged on the first end cover 12126, and the other electrode terminal 123 is arranged on the second end cover 12127.

[0349] In the above scheme, the second pressure relief component 126 is arranged on the third side wall 12122, and the first pressure relief component 125 is arranged on the first end cover 12126 and the second end cover 12127, so as to simplify the assembly difficulty of the first pressure relief component 125. Meanwhile, the second pressure relief component 126 is arranged on the third side wall 12122, which is beneficial to make the shell 121 have a certain pressure relief area while having high strength.

[0350] According to some embodiments of the present application, the present application provides a battery 100, please refer to Figure 2, which includes the battery cell 12 in one or more embodiments of the above embodiments.

[0351] In the above scheme, since the battery cell 12 in one or more embodiments of the above embodiments has high reliability, the battery 100 including the battery cell 12 in one or more embodiments of the above embodiments also has high reliability.

[0352] The present application provides a kind of electric equipment, please refer to Figure 1, it includes the battery cell 12 in one or more embodiments of the above embodiments or the battery 100 in one or more embodiments of the above embodiments, and the battery cell 12 or the battery 100 is used to provide electric energy.

[0353] In the above scheme, since the battery cell 12 in one or more embodiments of the above embodiments or the battery 100 in one or more embodiments of the above embodiments has high reliability, the electric equipment including the battery cell 12 in one or more embodiments of the above embodiments, or the electric equipment including the battery 100 in one or more embodiments of the above embodiments, all have high reliability.

[0354] According to some embodiments of the present application, referring to FIGS. 12-16, the present application provides a battery cell 12, the battery cell 12 comprising a housing 121, a first pressure relief component 125 disposed at a first wall portion 121a of the housing 121, the first pressure relief component 125 configured to rupture when a temperature inside the battery cell 12 or outside the battery cell 12 reaches a first threshold value, and a second pressure relief component 126 disposed at a second wall portion 121b of the housing 121, the second pressure relief component 126 configured to melt when a pressure inside the battery cell 12 reaches a second threshold value. The housing 121 comprises a shell 1212 and an end cover 1211, the shell 1212 comprising a bottom wall 12121 and a side wall surrounding the bottom wall 12121, one end of the side wall connected to the bottom wall 12121, the other end of the side wall surrounding an opening, and the end cover 1211 used to cover the opening. The first wall portion 121a is located at the end cover 1211. The end cover 1211 has a first pressure relief hole 127, and the first pressure relief component 125 seals the first pressure relief hole 127. The first pressure relief hole 127 is provided in a plurality, and the plurality of first pressure relief holes 127 are arranged in an array. The first pressure relief hole 127 and the first pressure relief component 125 are each provided in a plurality, the plurality of first pressure relief holes 127 are spaced apart, the plurality of first pressure relief components 125 are correspondingly provided with the plurality of first pressure relief holes 127, and the first pressure relief component 125 seals the first pressure relief hole 127 corresponding thereto. The first pressure relief component 125 is injection molded in the first pressure relief hole 127. The first pressure relief component 125 comprises a main body portion 1251, a first limiting portion 1252, and a second limiting portion 1253, and at least a portion of the main body portion 1251 is located in the first pressure relief hole 127. Along the thickness direction of the end cover 1211, the first limiting portion 1252 and the second limiting portion 1253 are respectively connected to both ends of the main body portion 1251, the first limiting portion 1252 and the second limiting portion 1253 each protrude from the outer peripheral surface of the main body, and a portion of the end cover 1211 is located between the first limiting portion 1252 and the second limiting portion 1253. The outer surface of the end cover 1211 is provided with a first groove 128, the inner surface of the end cover 1211 is provided with a second groove 129, the first pressure relief hole 127 penetrates the bottom wall of the first groove 128 and the bottom wall of the second groove 129, at least a portion of the first limiting portion 1252 is located in the first groove 128, and at least a portion of the second limiting portion 1253 is located in the second groove 129.

[0355] According to some embodiments of the present application, referring to FIGS. 17-21, the present application provides a battery cell 12, which comprises a housing 121, a first pressure relief component 125 disposed on a first wall portion 121a of the housing 121, and a second pressure relief component 126 disposed on a second wall portion 121b of the housing 121. The first pressure relief component 125 is configured to rupture when a temperature inside or outside the battery cell 12 reaches a first threshold value. The second pressure relief component 126 is configured to melt when a pressure inside the battery cell 12 reaches a second threshold value. The housing 121 comprises a shell 1212 and an end cover 1211. The shell 1212 comprises a bottom wall 12121 and a side wall surrounding the bottom wall 12121, one end of the side wall being connected to the bottom wall 12121, and the other end of the side wall surrounding an opening. The end cover 1211 is used to cover the opening. The first wall portion 121a is located at the end cover 1211. The end cover 1211 has a first pressure relief hole 127, and the first pressure relief component 125 covers the first pressure relief hole 127. The first pressure relief hole 127 is provided in a plurality of forms, and the plurality of first pressure relief holes 127 are arranged in an array. The first pressure relief hole 127 and the first pressure relief component 125 are each provided in a plurality of forms, the plurality of first pressure relief holes 127 are arranged at intervals, and the plurality of first pressure relief components 125 are arranged correspondingly to the plurality of first pressure relief holes 127. The first pressure relief component 125 covers the first pressure relief hole 127 corresponding thereto. The first pressure relief component 125 is injection molded in the first pressure relief hole 127. The first pressure relief component 125 comprises a main body portion 1251, a first limiting portion 1252, and a second limiting portion 1253. At least a portion of the main body portion 1251 is located in the first pressure relief hole 127. Along the thickness direction of the end cover 1211, the first limiting portion 1252 and the second limiting portion 1253 are respectively connected to both ends of the main body portion 1251, and the first limiting portion 1252 and the second limiting portion 1253 each protrude from the outer peripheral surface of the main body. A portion of the end cover 1211 is located between the first limiting portion 1252 and the second limiting portion 1253. The outer surface of the end cover 1211 is provided with a first groove 128, and the inner surface of the end cover 1211 is provided with a second groove 129. The first pressure relief hole 127 penetrates the bottom wall of the first groove 128 and the bottom wall of the second groove 129. At least a portion of the first limiting portion 1252 is located in the first groove 128, and at least a portion of the second limiting portion 1253 is located in the second groove 129. The battery cell 12 further comprises a first sealing member 1210, which is arranged between the second limiting portion 1253 and the bottom wall of the second groove 129 along the thickness direction of the end cover 1211.

[0356] According to some embodiments of the present application, referring to FIGS. 4-11, the present application provides a battery cell 12, the battery cell 12 includes a housing 121, a first pressure relief component 125 and a second pressure relief component 126, the first pressure relief component 125 is arranged on a first wall portion 121a of the housing 121, the first pressure relief component 125 is configured to rupture when a temperature inside or outside the battery cell 12 reaches a first threshold value. The second pressure relief component 126 is arranged on a second wall portion 121b of the housing 121, the second pressure relief component 126 is configured to melt when a pressure inside the battery cell 12 reaches a second threshold value. The housing 121 includes a shell 1212 and an end cover 1211, the shell 1212 includes a bottom wall 12121 and a side wall surrounding the bottom wall 12121, one end of the side wall is connected to the bottom wall 12121, the other end of the side wall surrounds an opening, and the end cover 1211 is used to cover the opening. Wherein, the second wall portion 121b is located on the end cover 1211. The second pressure relief component 126 includes a body and a filter 1219, the body has an opening area, the filter 1219 is arranged on a side of the opening area facing the inside of the housing 121, and the filter 1219 is used to divide the opening area into multiple sub-areas. A fifth groove 1261 is arranged on a side of the second pressure relief component 126 facing the inside of the housing 121, a bottom wall 12121 of the fifth groove 1261 forms the opening area, at least a part of the filter 1219 is contained in the fifth groove 1261, and the filter 1219 is connected to a side wall of the fifth groove 1261.

[0357] According to some embodiments of the present application, referring to FIGS. 22-29, the application provides a battery cell 12, the battery cell 12 comprising a housing 121, a first pressure relief component 125 disposed at a first wall portion 121a of the housing 121, the first pressure relief component 125 configured to rupture when a temperature inside the battery cell 12 or outside the battery cell 12 reaches a first threshold value, and a second pressure relief component 126 disposed at a second wall portion 121b of the housing 121, the second pressure relief component 126 configured to melt when a pressure inside the battery cell 12 reaches a second threshold value. The housing 121 comprises a shell 1212 and an end cover 1211, the shell 1212 comprising a bottom wall 12121 and a side wall surrounding the bottom wall 12121, one end of the side wall connected to the bottom wall 12121, the other end of the side wall surrounding an opening, and the end cover 1211 configured to cover the opening. The first wall portion 121a is located at the end cover 1211. The end cover 1211 has a fourth groove 1213 disposed at an outer surface or an inner surface of the end cover 1211, a first pressure relief hole 127 disposed at a bottom wall of the fourth groove 1213, and at least a portion of the first pressure relief component 125 accommodated in the fourth groove 1213. The battery cell 12 further comprises a first fixing member 1214, a portion of the first pressure relief component 125 located between the first fixing member 1214 and the bottom wall of the fourth groove 1213 along a thickness direction of the end cover 1211, and the first fixing member 1214 configured to fix the first pressure relief component 125 in the fourth groove 1213. The first fixing member 1214 is annular. An outer circumferential surface of the first fixing member 1214 is connected to a side wall of the fourth groove 1213. The battery cell 12 further comprises a second sealing member 1215, the second sealing member 1215 located between the first pressure relief component 125 and the bottom wall of the fourth groove 1213 along the thickness direction of the end cover 1211, and the second sealing member 1215 disposed around the plurality of first pressure relief holes 127.

[0358] According to some embodiments of the present application, referring to FIGS. 30-35, the application provides a battery cell 12, the battery cell 12 comprising a housing 121, a first pressure relief component 125 and a second pressure relief component 126, the first pressure relief component 125 is disposed on a first wall portion 121a of the housing 121, the first pressure relief component 125 is configured to rupture when a temperature inside or outside the battery cell 12 reaches a first threshold value. The second pressure relief component 126 is disposed on a second wall portion 121b of the housing 121, the second pressure relief component 126 is configured to melt when a pressure inside the battery cell 12 reaches a second threshold value. The housing 121 comprises a shell 1212 and an end cover 1211, the shell 1212 comprises a bottom wall 12121 and a side wall surrounding the bottom wall 12121, one end of the side wall is connected to the bottom wall 12121, the other end of the side wall surrounds an opening, and the end cover 1211 is used to cover the opening. Wherein the first wall portion 121a and the second wall portion 121b are both located on the end cover 1211. The end cover 1211 has a fourth groove 1213, the fourth groove 1213 is disposed on the outer surface or the inner surface of the end cover 1211, the first pressure relief hole 127 and the second pressure relief hole 1216 are both disposed on the bottom wall of the fourth groove 1213, a plurality of first pressure relief holes 127 are disposed around the second pressure relief hole 1216, and the second pressure relief component 126 is installed on the second pressure relief hole 1216.

[0359] At least a portion of the first pressure relief member 125 is accommodated in the fourth recess 1213. The battery cell 12 further includes a first fixing member 1214, along the thickness direction of the end cover 1211, a portion of the first pressure relief member 125 is located between the first fixing member 1214 and the bottom wall of the fourth recess 1213, and the first fixing member 1214 is configured to fix the first pressure relief member 125 in the fourth recess 1213. The first fixing member 1214 is annular. The outer peripheral surface of the first fixing member 1214 is connected with the side wall of the fourth recess 1213. The battery cell 12 further includes a second sealing member 1215, along the thickness direction of the end cover 1211, the second sealing member 1215 is located between the first pressure relief member 125 and the bottom wall of the fourth recess 1213, and the second sealing member 1215 is arranged around the plurality of first pressure relief holes 127. The first pressure relief member 125 is provided with a first through hole 1255, the first through hole 1255 is located at the center of the first pressure relief member 125, along the thickness direction of the second wall portion 121b, the projection of the second pressure relief member 126 at least partially overlaps with the first through hole 1255. The second wall portion 121b has a first boss 1220, the first boss 1220 protrudes from the outer surface or the inner surface of the second wall portion 121b, the first boss 1220 is arranged around the second pressure relief hole 1216, and the first pressure relief member 125 is sleeved on the outer peripheral surface of the first boss 1220 through the first through hole 1255. The battery cell 12 further includes a second fixing member 1217, the second fixing member 1217 is connected to the outer peripheral surface of the first boss 1220, along the thickness direction of the second wall portion 121b, a portion of the first pressure relief member 125 is located between the second fixing member 1217 and the second wall portion 121b, and the second fixing member 1217 is configured to fix the first pressure relief member 125 to the second wall portion 121b. The second fixing member 1217 is annular. The outer peripheral surface of the second fixing member 1217 is connected with the outer peripheral surface of the first boss 1220. The battery cell 12 further includes a third sealing member 1218, along the thickness direction of the second wall portion 121b, the third sealing member 1218 is located between the first pressure relief member 125 and the second wall portion 121b, and the third sealing member 1218 is arranged around the first through hole 1255.

[0360] According to some embodiments of the present application, referring to FIGS. 36-41, the application provides a battery cell 12, which includes a housing 121, a first pressure relief component 125 disposed on a first wall portion 121a of the housing 121, and a second pressure relief component 126 disposed on a second wall portion 121b of the housing 121. The first pressure relief component 125 is configured to rupture when a temperature inside or outside the battery cell 12 reaches a first threshold value. The second pressure relief component 126 is configured to melt when a pressure inside the battery cell 12 reaches a second threshold value. The housing 121 includes a shell 1212 and an end cover 1211. The shell 1212 includes a bottom wall 12121 and a side wall surrounding the bottom wall 12121, one end of the side wall being connected to the bottom wall 12121, and the other end of the side wall surrounding an opening. The end cover 1211 is used to cover the opening. The first wall portion 121a and the second wall portion 121b are both located on the end cover 1211. The end cover 1211 has a fourth groove 1213 disposed on an outer surface or an inner surface of the end cover 1211, and a first pressure relief hole 127 is disposed on a bottom wall of the fourth groove 1213. The end cover 1211 is also provided with a second pressure relief hole 1216, and a plurality of first pressure relief holes 127 are arranged at intervals with the second pressure relief hole 1216. The second pressure relief component 126 is installed in the second pressure relief hole 1216.

[0361] The end cover 1211 has a fourth groove 1213 disposed on an outer surface or an inner surface of the end cover 1211, and a first pressure relief hole 127 is disposed on a bottom wall of the fourth groove 1213, and at least a portion of the first pressure relief component 125 is accommodated in the fourth groove 1213. The battery cell 12 further includes a first fixing member 1214, and along the thickness direction of the end cover 1211, a portion of the first pressure relief component 125 is located between the first fixing member 1214 and the bottom wall of the fourth groove 1213. The first fixing member 1214 is configured to fix the first pressure relief component 125 in the fourth groove 1213. The first fixing member 1214 is annular. An outer peripheral surface of the first fixing member 1214 is connected to a side wall of the fourth groove 1213. The battery cell 12 further includes a second sealing member 1215, and along the thickness direction of the end cover 1211, the second sealing member 1215 is located between the first pressure relief component 125 and the bottom wall of the fourth groove 1213. The second sealing member 1215 is arranged around the plurality of first pressure relief holes 127. The second pressure relief component 126 includes a body, which is installed in the second pressure relief hole 1216. An outer surface of the body has a groove, and a bottom wall of the groove forms an opening area.

[0362] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: shell; a first pressure relief component disposed on a first wall portion of the housing, the first pressure relief component being configured to be actuated when a temperature inside the battery cell or outside the battery cell reaches a first threshold; The second pressure relief component is provided on the second wall portion of the housing, and is configured to be activated when the pressure inside the battery cell reaches a second threshold.

2. The battery cell according to claim 1, wherein: The first pressure relief member is configured to melt when a temperature inside the battery cell or outside the battery cell reaches a first threshold.

3. The battery cell according to claim 1 or 2, characterized in that: The first wall portion has a first pressure relief hole, and the first pressure relief component closes the first pressure relief hole.

4. The battery cell according to claim 3, characterized in that A plurality of the first pressure relief holes are provided, and the plurality of the first pressure relief holes are arranged in an array.

5. The battery cell according to claim 3 or 4, characterized in that: There are multiple first pressure relief holes and multiple first pressure relief components. The multiple first pressure relief holes are arranged at intervals. The multiple first pressure relief components are arranged corresponding to the multiple first pressure relief holes. The first pressure relief components close the corresponding first pressure relief holes.

6. The battery cell according to any one of claims 3 to 5, characterized in that: At least a portion of the first pressure relief component is located in the first pressure relief hole.

7. The battery cell according to any one of claims 3 to 6, characterized in that: The first pressure relief component is injection-molded in the first pressure relief hole.

8. The battery cell according to any one of claims 3 to 7, characterized in that: The first pressure relief component includes a main body, a first limiting portion and a second limiting portion, and at least a portion of the main body is located in the first pressure relief hole; Along the thickness direction of the first wall portion, the first limiting portion and the second limiting portion are respectively connected to the two ends of the main body portion, the first limiting portion and the second limiting portion both protrude from the outer circumferential surface of the main body, and a portion of the first wall portion is located between the first limiting portion and the second limiting portion.

9. The battery cell according to claim 8, characterized in that A first groove is provided on the outer surface of the first wall portion, a second groove is provided on the inner surface of the first wall portion, the first pressure relief hole passes through the bottom wall of the first groove and the bottom wall of the second groove, at least a portion of the first limiting portion is located in the first groove, and at least a portion of the second limiting portion is located in the second groove.

10. The battery cell according to claim 9, characterized in that The battery cell further includes a first seal, which is disposed between the first limiting portion and the bottom wall of the first groove along the thickness direction of the first wall portion, or between the second limiting portion and the bottom wall of the second groove.

11. The battery cell according to any one of claims 3 to 10, characterized in that: Along the thickness direction of the first wall portion, the first pressure relief component has a first surface facing the interior of the shell and a second surface away from the interior of the shell, and the first pressure relief component is provided with a third groove, the third groove is recessed from the first surface to the second surface or the third groove is recessed from the second surface to the first surface.

12. The battery cell according to claim 3 or 4, characterized in that: There are a plurality of first pressure relief holes, the plurality of first pressure relief holes are arranged at intervals, and the first pressure relief component closes the plurality of first pressure relief holes.

13. The battery cell according to any one of claims 3 to 12, characterized in that: The first wall portion has a fourth groove, which is arranged on the outer surface or inner surface of the first wall portion. The first pressure relief hole is arranged on the bottom wall of the fourth groove. At least a portion of the first pressure relief component is accommodated in the fourth groove.

14. The battery cell according to claim 13, characterized in that The battery cell also includes a first fixing member connected to the first wall portion. Along the thickness direction of the first wall portion, a portion of the first pressure relief component is located between the first fixing member and the bottom wall of the fourth groove. The first fixing member is configured to fix the first pressure relief component in the fourth groove.

15. The battery cell according to claim 14, characterized in that The first fixing member is annular.

16. The battery cell according to claim 14 or 15, characterized in that: An outer peripheral surface of the first fixing member is connected to a side wall of the fourth groove.

17. The battery cell according to any one of claims 13 to 16, characterized in that: The battery cell further includes a second sealant located between the first pressure relief component and the bottom wall of the fourth groove along a thickness direction of the first wall portion, and the second sealant is disposed around the plurality of first pressure relief holes.

18. The battery cell according to any one of claims 3 to 17, characterized in that: The first wall portion and the second wall portion are located on the same wall of the housing. The second wall portion is provided with a second pressure relief hole. The second pressure relief component is installed in the second pressure relief hole. A plurality of first pressure relief holes are provided around the second pressure relief hole.

19. The battery cell according to any one of claims 12 to 17, characterized in that: The first wall portion and the second wall portion are located on the same wall of the shell, the second wall portion is provided with a second pressure relief hole, the second pressure relief component is installed in the second pressure relief hole, a plurality of first pressure relief holes are arranged around the second pressure relief hole, the first pressure relief component is provided with a first through hole, and along the thickness direction of the second wall portion, the projection of the second pressure relief component at least partially overlaps with the first through hole.

20. The battery cell according to claim 19, characterized in that The second wall portion has a first boss protruding from the outer surface or inner surface of the second wall portion. The first boss is arranged around the second pressure relief hole, and the first pressure relief component is sleeved on the outer circumferential surface of the first boss through the first through hole.

21. The battery cell according to claim 20, characterized in that The battery cell also includes a second fixing member connected to the outer peripheral surface of the first boss. Along the thickness direction of the second wall portion, a portion of the first pressure relief component is located between the second fixing member and the second wall portion. The second fixing member is configured to fix the first pressure relief component to the second wall portion.

22. The battery cell according to claim 21, characterized in that The second fixing member is annular.

23. The battery cell according to claim 21 or 22, characterized in that: The outer circumferential surface of the second fixing member is connected to the outer circumferential surface of the first boss.

24. The battery cell according to any one of claims 19 to 23, characterized in that: The battery cell further includes a third sealing member located between the first pressure relief component and the second wall portion along a thickness direction of the second wall portion, and the third sealing member is disposed around the first through hole.

25. The battery cell according to any one of claims 3 to 24, characterized in that: The area of ​​the first pressure relief hole is S1, which satisfies: 1mm 2 ≤S1≤100mm 2 .

26. The battery cell according to claim 25, characterized in that 2mm 2 ≤S1≤50mm 2 。 27. The battery cell according to any one of claims 1 to 26, characterized in that: The second pressure relief component includes a body and a filter element. The body has an open area. The filter element is arranged on a side of the open area facing the interior of the housing. The filter element is used to separate the open area into a plurality of sub-areas.

28. The battery cell according to claim 27, characterized in that A fifth groove is provided on a side of the second pressure relief component facing the interior of the housing, the bottom wall of the fifth groove forms the opening area, at least a portion of the filter element is accommodated in the fifth groove, and the filter element is connected to the side wall of the fifth groove.

29. The battery cell according to claim 27 or 28, characterized in that: The area of ​​the sub-region is S2, which satisfies: 1mm 2 ≤S2≤400mm 2 .

30. The battery cell according to claim 27, wherein: 2mm 2 ≤S2≤200mm 2 。 31. The battery cell according to any one of claims 1 to 30, characterized in that: The first threshold is T, which satisfies: 95°C≤T≤300°C.

32. The battery cell according to any one of claims 1 to 31, characterized in that: The second threshold is P, which satisfies: 0.3Mpa≤P≤2.3Mpa.

33. The battery cell according to any one of claims 1 to 32, characterized in that: The housing includes a shell and an end cover, the shell includes a bottom wall and a side wall surrounding the bottom wall, one end of the side wall is connected to the bottom wall, the other end of the side wall forms an opening, and the end cover is used to cover the opening; Wherein, the end cover is provided with the first pressure relief component and the second pressure relief component.

34. The battery cell according to claim 33, characterized in that The bottom wall is provided with the first pressure relief component.

35. The battery cell according to any one of claims 1 to 32, characterized in that: The housing includes a shell and an end cover, the shell includes a bottom wall and a side wall surrounding the bottom wall, one end of the side wall is connected to the bottom wall, the other end of the side wall forms an opening, and the end cover is used to cover the opening; Wherein, the end cover is provided with the second pressure relief component, and the bottom wall is provided with the first pressure relief component.

36. The battery cell according to any one of claims 1 to 32, characterized in that: The housing includes a shell and an end cover, the shell includes a bottom wall and a side wall surrounding the bottom wall, one end of the side wall is connected to the bottom wall, the other end of the side wall forms an opening, and the end cover is used to cover the opening; Wherein, the end cover is provided with the first pressure relief component, and the bottom wall is provided with the second pressure relief component.

37. The battery cell according to any one of claims 1 to 32, characterized in that: The housing includes a shell, a first end cover and a second end cover, the shell includes a third side wall and a fourth side wall arranged opposite to each other along a third direction, and a first side wall and a second side wall arranged opposite to each other along a second direction, the third side wall, the fourth side wall, the first side wall and the second side wall enclose a receiving cavity having a first opening and a second opening, the first opening and the second opening being arranged opposite to each other along the first direction, the first end cover being used to cover the first opening, and the second end cover being used to cover the second opening, and the first direction, the second direction and the third direction being perpendicular to each other; Wherein, the third side wall is provided with a second pressure relief component, and the first end cover and the second end cover are both provided with a first pressure relief component.

38. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 37.

39. An electrical device, characterized in that: The method comprises the battery cell according to any one of claims 1 to 37 or the battery according to claim 38, wherein the battery cell or the battery is used to provide electrical energy.

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