Battery monomer and battery pack

Abstract

The utility model provides a battery monomer and a battery pack, and relates to the technical field of batteries. The battery monomer has a first direction and comprises a shell, a pole, an electrode assembly, an anti-explosion valve and a protection piece, the shell is provided with a through hole penetrating in the first direction. The pole penetrates through the shell; the electrode assembly is arranged in the shell and is electrically connected with the pole; the anti-explosion valve is connected with the shell to seal and cover the through hole; the protection piece is connected with the side, away from the electrode assembly, of the shell in the first direction, the protection piece and the anti-explosion valve are arranged in a spaced mode in the first direction, the protection piece is provided with a ventilation opening penetrating in the first direction, and a part of the protection piece protrudes in the direction away from the anti-explosion valve in the first direction. According to the battery monomer provided by the invention, when the battery monomer encounters an impact working condition, the protection piece can bear the impact of part of external impact force on the anti-explosion valve, so that the failure risk of the anti-explosion valve is reduced, and the safety of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] Battery cells are a crucial component of the power battery pack in new energy vehicles. When a battery cell is subjected to impact conditions, the external impact force can easily damage the explosion-proof valve, causing it to fail and thus affecting the safety of the battery cell. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem that when the battery cell is subjected to impact conditions, the external impact force can easily damage the explosion-proof valve, causing the explosion-proof valve to fail.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a battery cell having a first orientation, the battery cell comprising:

[0007] The outer casing is provided with a through hole extending along the first direction;

[0008] The pole is inserted into the outer casing;

[0009] An electrode assembly is disposed within the housing and electrically connected to the electrode post;

[0010] An explosion-proof valve is connected to the housing to seal the through-hole;

[0011] A protective component is connected to the outer casing on the side opposite to the electrode assembly along the first direction. The protective component and the explosion-proof valve are spaced apart along the first direction. The protective component is provided with a vent that extends through the first direction. A portion of the protective component protrudes along the first direction away from the explosion-proof valve.

[0012] In one embodiment of the first aspect, the battery cell has a first direction, a second direction and a third direction that are perpendicular to each other, the protective member is integrally formed with the outer shell, and the vent includes a plurality of vent holes, which are arranged at intervals along the second direction or the third direction.

[0013] In one embodiment of the first aspect, the protective member includes a protrusion and a first connecting portion connected together, the first connecting portion being disposed around the protrusion, the protrusion having the vent provided thereon, the protrusion being disposed in a direction away from the explosion-proof valve along the first direction, and the first connecting portion being connected to the housing.

[0014] In one embodiment of the first aspect, the housing is provided with a second connecting portion on the side away from the electrode assembly along the first direction, and the housing is provided with a third connecting portion on the side facing the electrode assembly along the first direction, the second connecting portion and the third connecting portion are arranged around the protrusion, and the first connecting portion is disposed between the second connecting portion and the third connecting portion.

[0015] In one embodiment of the first aspect, the protrusion is provided with an indentation groove on the side near the explosion-proof valve, the indentation groove being recessed in the direction away from the explosion-proof valve.

[0016] In one embodiment of the first aspect, the indentation groove includes a first indentation groove, a second indentation groove, and a third indentation groove, wherein the first indentation groove and the second indentation groove are spaced apart, and the third indentation groove is located between the first indentation groove and the second indentation groove and communicates with the first indentation groove and the second indentation groove.

[0017] In one embodiment of the first aspect, the protective element is made of carbon fiber.

[0018] In one embodiment of the first aspect, the housing includes a cover plate and a housing connected together, the electrode assembly is disposed within the housing, the electrode post is disposed through the cover plate, the cover plate is provided with the through hole, and the explosion-proof valve and the protective member are connected to the cover plate.

[0019] In one embodiment of the first aspect, the housing includes a cover plate and a housing connected together, the electrode assembly is disposed within the housing, the electrode post is disposed through the cover plate, the housing has a bottom wall, the bottom wall and the cover plate are disposed opposite to each other along the first direction, the bottom wall is provided with the through hole, and the explosion-proof valve and the protective member are connected to the bottom wall.

[0020] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0021] The beneficial effects of this application are as follows:

[0022] In the battery cell provided in this application, since the protective component and the explosion-proof valve are spaced apart along the first direction, and a part of the protective component protrudes away from the explosion-proof valve along the first direction, the protective component has a certain support and buffering capacity. When the battery cell encounters an impact condition, the protective component can bear part of the impact force of the external impact on the explosion-proof valve, thereby reducing the risk of failure of the explosion-proof valve and improving the safety of the battery cell.

[0023] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural schematic diagram of a battery cell in one embodiment of this application is shown;

[0026] Figure 2 It shows Figure 1 A schematic diagram of the decomposed structure;

[0027] Figure 3 It shows Figure 2 A schematic diagram of the assembly structure of the explosion-proof valve, protective components, and cover plate;

[0028] Figure 4 It shows Figure 3 A schematic diagram of the cross-sectional structure along a third direction;

[0029] Figure 5 It shows Figure 4 Enlarged structural diagram of region A in the middle;

[0030] Figure 6 It shows Figure 3 A schematic diagram of the decomposed structure;

[0031] Figure 7 A schematic diagram of the assembly structure of the protective component and cover plate of the battery cell is shown in another embodiment of this application;

[0032] Figure 8 It shows Figure 7 A schematic diagram of the cross-sectional structure along a third direction;

[0033] Figure 9 It shows Figure 8 A magnified structural diagram of region B in the middle;

[0034] Figure 10 An exploded structural diagram of the explosion-proof valve, protective component, and cover plate of a battery cell is shown in another embodiment of this application;

[0035] Figure 11 It shows Figure 10 A schematic diagram of the structure of the central protective component from one perspective.

[0036] Explanation of key component symbols:

[0037] 100 - Battery cell; 110 - Casing; 111 - Cover plate; 1111 - Through hole; 1112 - Second connection part; 1113 - Third connection part; 112 - Housing; 1122 - Bottom wall; 120 - Terminal post; 130 - Electrode assembly; 140 - Explosion-proof valve; 141 - Gap; 150 - Protective component; 151 - Protrusion; 1511 - Vent; 15111 - Vent hole; 1512 - Indentation groove; 15121 - First indentation groove; 15122 - Second indentation groove; 15123 - Third indentation groove; 152 - First connection part; 160 - Insulating film; X - Third direction; Y - Second direction; Z - First direction. Detailed Implementation

[0038] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0039] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In the description of this application, the term "and / or" indicates that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0044] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0045] Battery cells are a crucial component of the power battery pack in new energy vehicles. To mitigate the danger of thermal runaway in battery cells, the explosion-proof valves are typically positioned downwards to facilitate the evacuation of high-temperature, high-pressure gases to the bottom of the vehicle in the event of thermal runaway, thus preventing harm to occupants. However, when battery cells encounter impact conditions, external impact forces can easily damage the explosion-proof valves, causing them to fail and compromising the safety of the battery cell.

[0046] like Figure 1 As shown, in order to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs for application in electrical devices or energy storage devices. Of course, the battery cell 100 can also be directly applied to electrical devices or energy storage devices without using a battery pack; no specific limitations are made on the application scenarios of the battery cell 100 here.

[0047] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, and new energy vehicles, with new energy vehicles including pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles; spacecraft can be airplanes, rockets, space shuttles, drones, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices include energy storage containers and energy storage power stations; no specific restrictions are placed on the types of electrical devices and energy storage devices here.

[0048] Combination Figures 2 to 4 As shown, the battery cell 100 provided in this embodiment has a first direction Z and includes: a housing 110, a terminal post 120, an electrode assembly 130, an explosion-proof valve 140, and a protective component 150.

[0049] The outer casing 110 is provided with a through hole 1111 extending along the first direction Z; the electrode post 120 is inserted through the outer casing 110; the electrode assembly 130 is disposed inside the outer casing 110 and is electrically connected to the electrode post 120; the explosion-proof valve 140 is connected to the outer casing 110 to cover the through hole 1111; the protective member 150 is connected to the side of the outer casing 110 away from the electrode assembly 130 along the first direction Z, the protective member 150 and the explosion-proof valve 140 are spaced apart along the first direction Z, the protective member 150 is provided with a vent 1511 extending along the first direction Z, and a part of the protective member 150 protrudes away from the explosion-proof valve 140 along the first direction Z.

[0050] It should be noted that "the outer casing 110 is provided with a through hole 1111 extending along the first direction Z" can be understood as: the through hole 1111 extends from the outer wall of the outer casing 110 to the inner wall of the outer casing 110 along the first direction Z, thereby communicating with the interior of the outer casing 110. "The protective member 150 is connected to the side of the outer casing 110 opposite to the electrode assembly 130 along the first direction Z" can be understood as: the protective member 150 is connected to the outer wall of the outer casing 110 along the first direction Z. "The protective member 150 is provided with a vent 1511 extending along the first direction Z" can be understood as: the vent 1511 extends through the entire protective member 150 along the first direction Z.

[0051] It is understood that the battery cell 100 provided in this embodiment, because the protective component 150 and the explosion-proof valve 140 are spaced apart along the first direction Z, and a portion of the protective component 150 protrudes away from the explosion-proof valve 140 along the first direction Z, gives the protective component 150 a certain supporting and buffering capacity. When the battery cell 100 encounters an impact condition, the protective component 150 can withstand part of the external impact force on the explosion-proof valve 140, thereby reducing the failure risk of the explosion-proof valve 140 and improving the safety of the battery cell 100. At the same time, by spaced apart along the first direction Z, a [structure] is formed between the protective component 150 and the explosion-proof valve 140. Figure 5 As shown in the gap 141, when the battery cell 100 experiences thermal runaway, the high-temperature and high-pressure gas generated by the thermal runaway can be discharged from the battery cell 100 through the vent via the gap 141.

[0052] like Figure 1 as well as Figures 7 to 9 As shown, in one embodiment, the battery cell 100 has a first direction Z, a second direction Y and a third direction X that are perpendicular to each other. The protective member 150 is integrally formed with the outer shell 110. The vent 1511 includes a plurality of vent holes 15111, which are arranged at intervals along the second direction Y or the third direction X.

[0053] It is understandable that by integrally molding the protective component 150 with the outer casing 110, the cost of parts processing and procedures can be reduced. Since the vent 1511 includes multiple vent holes 15111, and the multiple vent holes 15111 are arranged at intervals along the second direction Y or the third direction X, when the battery cell 100 experiences thermal runaway, the explosion-proof valve 140 opens, and the high-temperature and high-pressure gas can be discharged to the outside of the battery cell 100 in a timely manner through the multiple vent holes 15111.

[0054] Furthermore, the sum of the cross-sectional areas of the multiple vent holes 15111 is S1, and the cross-sectional area of ​​the through hole 1111 is S2, satisfying: 0.2S2≤S1≤0.9S2, that is, the sum of the cross-sectional areas of the multiple vent holes 15111, S1, is 20% to 90% of the cross-sectional area of ​​the through hole 1111, so that when the battery cell 100 experiences thermal runaway, the risk that high-temperature and high-pressure gas cannot be discharged in time through the multiple vent holes 15111 can be reduced, and the protective component 150 can effectively withstand external impact forces.

[0055] For example, the sum of the cross-sectional areas S1 of the plurality of vent holes 15111 can be any value from 0.2S2, 0.25S2, 0.26S2, 0.3S2, 0.5S2, 0.6S2, 0.62S2, 0.64S2, 0.7S2, 0.73S2, 0.8S2, 0.87S2 and 0.9S2 or any value from a range of any two of them, without any specific limitation.

[0056] like Figure 1 as well as Figures 3 to 6 As shown, in another embodiment, the protective member 150 includes a protrusion 151 and a first connecting portion 152 connected together. The first connecting portion 152 is disposed around the protrusion 151. The protrusion 151 is provided with a vent 1511. The protrusion 151 protrudes in a first direction Z away from the explosion-proof valve 140. The first connecting portion 152 is connected to the outer shell 110.

[0057] It is understandable that the first connecting part 152 facilitates the connection of the protective component 150 to the outer casing 110 in the form of component assembly; at the same time, when the battery cell 100 experiences thermal runaway, the explosion-proof valve 140 opens, and the high-temperature and high-pressure gas can be discharged to the outside of the battery cell 100 in a timely manner through the vent 1511.

[0058] Furthermore, the cross-sectional area of ​​the vent 1511 is S1, and the cross-sectional area of ​​the through hole 1111 is S2, satisfying: 0.2S2≤S1≤0.9S2, that is, the cross-sectional area S1 of the vent 1511 is 20% to 90% of the cross-sectional area S2 of the through hole 1111. This can reduce the risk that high-temperature and high-pressure gas cannot be discharged in time through the vent 1511 when the battery cell 100 experiences thermal runaway, and enable the protective component 150 to effectively withstand external impact forces.

[0059] For example, the cross-sectional area S1 of the vent 1511 can be any value from 0.2S2, 0.25S2, 0.26S2, 0.3S2, 0.5S2, 0.6S2, 0.62S2, 0.64S2, 0.7S2, 0.73S2, 0.8S2, 0.87S2 and 0.9S2 or any value from a range of any two of them, without any specific limitation.

[0060] like Figure 1 as well as Figures 3 to 5 As shown, further, the outer casing 110 is provided with a second connecting portion 1112 on the side away from the electrode assembly 130 along the first direction Z, and a third connecting portion 1113 is provided on the side of the outer casing 110 facing the electrode assembly 130 along the first direction Z. The second connecting portion 1112 and the third connecting portion 1113 are arranged around the protrusion 151, and the first connecting portion 152 is disposed between the second connecting portion 1112 and the third connecting portion 1113.

[0061] It should be noted that "the outer shell 110 is provided with a second connecting part 1112 on the side away from the electrode assembly 130 along the first direction Z, and the outer shell 110 is provided with a third connecting part 1113 on the side facing the electrode assembly 130 along the first direction Z" can be understood as: the outer shell 110 is provided with a second connecting part 1112 on the outer wall along the first direction Z, and the outer shell 110 is provided with a third connecting part 1113 on the inner wall along the first direction Z.

[0062] For example, the first connecting portion 152 and / or the second connecting portion 1112 may be formed by roll forming or riveting and flanging.

[0063] It is understood that by providing a second connecting portion 1112 and a third connecting portion 1113 on the outer casing 110, and by placing a first connecting portion 152 of the protective member 150 between the second connecting portion 1112 and the third connecting portion 1113, the protective member 150 can be stably connected to the outer casing 110.

[0064] like Figure 10 and Figure 11 As shown, further, an indentation groove 1512 is provided on the side of the protrusion 151 near the explosion-proof valve 140, and the indentation groove 1512 is recessed in the direction away from the explosion-proof valve 140. It can be understood that by providing the indentation groove 1512 on the side of the protrusion 151 near the explosion-proof valve 140, the structure of the protrusion 151 near the explosion-proof valve 140 at the indentation groove 1512 is relatively weak, thereby giving the protective component 150 the ability to deform. Thus, when the battery cell 100 experiences thermal runaway, the explosion-proof valve 140 opens, and under the impact of high-temperature and high-pressure gas, the protective component 150 can contract and detach from the outer casing 110, thereby allowing for more efficient venting.

[0065] like Figure 11As shown, the indentation groove 1512 further includes a first indentation groove 15121, a second indentation groove 15122 and a third indentation groove 15123. The first indentation groove 15121 and the second indentation groove 15122 are spaced apart, and the third indentation groove 15123 is located between the first indentation groove 15121 and the second indentation groove 15122 and communicates with the first indentation groove 15121 and the second indentation groove 15122. This layout design enables the protective component 150 to have good deformation capability, so that it can quickly shrink and detach from the outer shell 110 to exhaust a large amount of gas under the impact of high temperature and high pressure gas.

[0066] Of course, the structure of the indentation groove 1512 is not limited to this. In other embodiments, the indentation groove 1512 includes an intersecting and interconnected first indentation groove 15121 and a second indentation groove 15122, which can also enable the protective member 150 to have shrinkage capability. Here, no specific limitation is made on the structure of the indentation groove 1512.

[0067] Furthermore, the protective component 150 is made of carbon fiber. The protective component 150 made of carbon fiber has the characteristics of high structural strength, which can better withstand some of the external impact force on the explosion-proof valve 140, thereby more effectively protecting the explosion-proof valve 140.

[0068] Of course, for the above embodiments, the material of the protective component 150 can also be metal or plastic, and no specific limitation is made on the material of the protective component 150 here.

[0069] like Figure 1 and Figure 2 As shown, in one embodiment, the outer casing 110 includes a cover plate 111 and a housing 112 connected to each other. The electrode assembly 130 is disposed inside the housing 112. The electrode post 120 is disposed through the cover plate 111. The cover plate 111 is provided with a through hole 1111. The explosion-proof valve 140 and the protective member 150 are connected to the cover plate 111.

[0070] Understandably, when the explosion-proof valve 140 is installed on the cover plate 111, since the protective element 150 is connected to the cover plate 111, a part of the protective element 150 protrudes from the cover plate 111, thereby being able to withstand part of the external impact force on the explosion-proof valve 140 on the cover plate 111.

[0071] In another embodiment, the outer casing 110 includes a cover plate 111 and a housing 112 connected together. The electrode assembly 130 is disposed inside the housing 112. The electrode post 120 is disposed through the cover plate 111. The housing 112 has a bottom wall 1122, which is disposed opposite to the cover plate 111 along a first direction Z. A through hole 1111 is provided on the bottom wall 1122. An explosion-proof valve 140 and a protective member 150 are connected to the bottom wall 1122.

[0072] It is understandable that when the explosion-proof valve 140 is installed on the bottom wall 1122 of the housing 112, since the protective member 150 is connected to the bottom wall 1122 of the housing 112, a part of the protective member 150 protrudes from the bottom wall 1122 of the housing 112, thereby being able to withstand part of the external impact force on the explosion-proof valve 140 on the bottom wall 1122 of the housing 112.

[0073] like Figures 3 to 5 As shown, in one embodiment, the protective member 150 protrudes from the outer shell 110 in the direction away from the explosion-proof valve 140 along the first direction Z by a dimension of H, the explosion-proof valve 140 is sized by a dimension of W along the third direction X, and the explosion-proof valve 140 is sized by a dimension of L along the second direction Y, satisfying: H≥(L+W) / 2. This allows for a sufficiently large gap 141 between the protective member 150 and the explosion-proof valve 140 in the first direction Z, enabling high-temperature and high-pressure gas to be discharged more smoothly through the vent 1511.

[0074] like Figure 1 and Figure 2 As shown, the battery cell 100 also includes an insulating film 160, which is located inside the housing 112 and covers the electrode assembly 130, so that the electrode assembly 130 and the housing 112 are insulated from each other, thereby reducing the risk of short circuit in the battery cell 100.

[0075] For example, when the battery cell 100 has a length direction, a width direction and a height direction, the first direction Z is parallel to the height direction, the second direction Y is parallel to the width direction, and the third direction X is parallel to the length direction.

[0076] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 100 from any of the above embodiments.

[0077] It is understood that since the battery pack provided in this embodiment has the battery cell 100 in any of the above embodiments, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell having a first orientation (Z), characterized in that, The battery cell includes: The outer casing (110) is provided with a through hole (1111) extending along the first direction (Z); A pole post (120) is inserted into the outer casing (110); An electrode assembly (130) is disposed within the housing (110) and electrically connected to the electrode post (120); An explosion-proof valve (140) is connected to the housing (110) to cover the through hole (1111); The protective member (150) is connected to the outer casing (110) on the side opposite to the electrode assembly (130) along the first direction (Z). The protective member (150) and the explosion-proof valve (140) are spaced apart along the first direction (Z). The protective member (150) is provided with a vent (1511) that extends through along the first direction (Z). A portion of the protective member (150) protrudes along the first direction (Z) away from the explosion-proof valve (140).

2. The battery cell according to claim 1, characterized in that, The battery cell has a first direction (Z), a second direction (Y) and a third direction (X) that are perpendicular to each other. The protective member (150) is integrally formed with the outer shell (110). The vent (1511) includes a plurality of vent holes (15111), and the plurality of vent holes (15111) are arranged at intervals along the second direction (Y) or the third direction (X).

3. The battery cell according to claim 1, characterized in that, The protective component (150) includes a protrusion (151) and a first connecting portion (152) connected together. The first connecting portion (152) is arranged around the protrusion (151). The protrusion (151) is provided with the vent (1511). The protrusion (151) protrudes along the first direction (Z) in a direction away from the explosion-proof valve (140). The first connecting portion (152) is connected to the outer shell (110).

4. The battery cell according to claim 3, characterized in that, The outer casing (110) has a second connecting portion (1112) on the side away from the electrode assembly (130) along the first direction (Z), and a third connecting portion (1113) on the side of the outer casing (110) facing the electrode assembly (130) along the first direction (Z). The second connecting portion (1112) and the third connecting portion (1113) are arranged around the protrusion (151), and the first connecting portion (152) is disposed between the second connecting portion (1112) and the third connecting portion (1113).

5. The battery cell according to claim 3, characterized in that, The protrusion (151) is provided with an indentation groove (1512) on the side near the explosion-proof valve (140), and the indentation groove (1512) is recessed in the direction away from the explosion-proof valve (140).

6. The battery cell according to claim 5, characterized in that, The indentation groove (1512) includes a first indentation groove (15121), a second indentation groove (15122), and a third indentation groove (15123). The first indentation groove (15121) and the second indentation groove (15122) are spaced apart. The third indentation groove (15123) is located between the first indentation groove (15121) and the second indentation groove (15122) and communicates with the first indentation groove (15121) and the second indentation groove (15122).

7. The battery cell according to claim 3, characterized in that, The protective component (150) is made of carbon fiber.

8. The battery cell according to any one of claims 1 to 7, characterized in that, The outer casing (110) includes a cover plate (111) and a housing (112) connected to each other. The electrode assembly (130) is disposed inside the housing (112). The electrode post (120) is disposed through the cover plate (111). The cover plate (111) is provided with the through hole (1111). The explosion-proof valve (140) and the protective component (150) are connected to the cover plate (111).

9. The battery cell according to any one of claims 1 to 7, characterized in that, The outer casing (110) includes a cover plate (111) and a housing (112) connected to each other. The electrode assembly (130) is disposed inside the housing (112). The electrode post (120) is disposed through the cover plate (111). The housing (112) has a bottom wall (1122). The bottom wall (1122) and the cover plate (111) are disposed opposite to each other along the first direction (Z). The bottom wall (1122) is provided with the through hole (1111). The explosion-proof valve (140) and the protective member (150) are connected to the bottom wall (1122).

10. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 9.

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