A single battery and a battery pack

Abstract

This application provides a single-cell battery and a battery pack, belonging to the field of battery technology. The single-cell battery has a first direction and a second direction perpendicular to each other. The single-cell battery includes a casing, a top cover, an electrode assembly, and a protrusion. The casing has a bottom wall, and the bottom wall is provided with an explosion-proof valve. The top cover is connected to one end of the casing along the first direction, and the top cover and the bottom wall are arranged opposite each other along the first direction. The electrode assembly is disposed inside the casing. A protrusion is formed on the bottom wall along the first direction, pointing away from the electrode assembly. The protrusion includes a first protrusion and a second protrusion, which are arranged on opposite sides along the second direction and spaced apart from the explosion-proof valve along the second direction. The single-cell battery provided in this application, by providing a protrusion on the bottom wall of the casing, not only improves the strength of the bottom wall but also ensures the energy density of the single-cell battery and guarantees the stability and safety of the explosion-proof valve.

Description

Technical Field

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

[0002] In the field of power batteries, ensuring the manufacturability and safety and reliability of batteries is of paramount importance to battery manufacturers. Among these, the reliability of the battery's valve opening and pressure relief is particularly critical.

[0003] The existing explosion-proof valve is located at the bottom of the battery. However, the bottom-out explosion-proof valve design makes the battery cells susceptible to interference from foreign objects at the bottom during vehicle operation. When a foreign object located at the bottom of the vehicle impacts the bottom of the battery, it can easily cause safety risks. Utility Model Content

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a single cell battery and a battery pack.

[0005] This application provides the following technical solution: a single-cell battery having a first direction and a second direction perpendicular to each other, including:

[0006] The housing has a bottom wall, and the bottom wall is provided with an explosion-proof valve;

[0007] A top cover is connected to one end of the housing along the first direction, and the top cover and the bottom wall are disposed opposite to each other along the first direction;

[0008] Electrode assemblies are disposed within the housing;

[0009] The bottom wall protrudes along the first direction to the side opposite to the electrode assembly to form a protrusion. The protrusion includes a first protrusion and a second protrusion. The first protrusion and the second protrusion are arranged on two opposite sides along the second direction. The explosion-proof valve is spaced between the first protrusion and the second protrusion along the second direction.

[0010] In some embodiments, the first protrusion is recessed on the side near the electrode assembly to form a first clearance groove in the direction away from the electrode assembly, and the second protrusion is recessed on the side near the electrode assembly to form a second clearance groove in the direction away from the electrode assembly.

[0011] The single battery also includes a bottom support plate, and the bottom support plate has a first positioning part and a second positioning part on the side facing the bottom wall. The first positioning part is received in the first clearance groove, and the second positioning part is received in the second clearance groove.

[0012] In some embodiments, the single battery cell has a third direction that is perpendicular to both the first direction and the second direction. The protrusion further includes a third protrusion, which is spaced apart from the first protrusion and the second protrusion along the third direction. The bottom wall is provided with the third protrusion on both opposite sides along the third direction. The explosion-proof valve is spaced apart between two adjacent third protrusions along the third direction.

[0013] In some embodiments, the third protrusion is recessed on the side near the electrode assembly in a direction away from the electrode assembly to form a third clearance groove;

[0014] The bottom support plate is provided with a third positioning part on the side facing the bottom wall, and the third positioning part is received in the third clearance groove.

[0015] In some embodiments, the third protrusion includes a plurality of first protrusion segments, the first protrusion segments being spaced apart from the first protrusion and the second protrusion along the third direction, the plurality of first protrusion segments being spaced apart along the second direction, and the explosion-proof valve being spaced apart from the first protrusion segments along the third direction.

[0016] In some embodiments, the third protrusion further includes at least one second protrusion segment extending along a second direction and connected to a plurality of the first protrusion segments.

[0017] In some embodiments, the height of the first positioning part along the first direction is greater than the depth of the first clearance groove, and / or the height of the second positioning part along the first direction is greater than the depth of the second clearance groove, and an exhaust space is formed by spacing the side of the bottom support plate facing the bottom wall and the side of the bottom wall facing the bottom support plate, and the exhaust space is connected to the explosion-proof valve.

[0018] In some embodiments, the base plate is provided with a plurality of through holes extending along the first direction, the plurality of through holes being spaced apart on two opposite sides along the second direction, the through holes connecting the electrode assembly and the exhaust space.

[0019] In some embodiments, the bottom support plate has a guide groove on the side facing the bottom wall, and the through hole communicates with the exhaust space through the guide groove.

[0020] Secondly, some embodiments of this application provide a battery pack including the aforementioned single battery cell.

[0021] The embodiments of this application have the following advantages: by providing a protrusion on the bottom wall of the housing, a reinforcing structure is formed around the explosion-proof valve through the protrusion, thereby improving the overall impact resistance of the bottom wall. Furthermore, the protrusion is positioned on the side away from the electrode assembly, which not only improves the strength of the bottom wall but also ensures the energy density of the individual battery, thus ensuring the stability and safety of the explosion-proof valve.

[0022] 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

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This paper shows a schematic diagram of the structure of a single-cell battery from one perspective, based on some embodiments of this application.

[0025] Figure 2 It shows Figure 1 Sectional view of section AA;

[0026] Figure 3 It shows Figure 2 Enlarged view of section B;

[0027] Figure 4 This paper shows a schematic diagram of the structure of a first embodiment of a single-cell battery provided by some embodiments of this application;

[0028] Figure 5 This illustration shows a schematic structural diagram from one perspective of a second embodiment of a single-cell battery provided by some embodiments of this application;

[0029] Figure 6 This application provides a schematic diagram of the internal structure of a single-cell battery casing from one perspective, based on some embodiments of the present application.

[0030] Figure 7 This invention provides a schematic diagram of the structure of a bottom support plate in a single-cell battery according to some embodiments of the present application.

[0031] Figure 8 An exploded view of a single cell provided in some embodiments of this application is shown.

[0032] Explanation of key component symbols:

[0033] 100-Housing shell; 110-Bottom wall; 120-Explosion-proof valve; 200-Electrode assembly; 300-Protrusion; 310-First protrusion; 320-Second protrusion; 130-First clearance groove; 140-Second clearance groove; 150-Third clearance groove; 330-Third protrusion; 331-First protrusion section; 332-Second protrusion section; 400-Bottom support plate; 410-First positioning part; 420-Second positioning part; 430-Through hole; 440-Guide groove; 450-Third positioning part; 500-Top cover; 600-Exhaust space.

[0034] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of these 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.

[0036] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "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.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "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 specified.

[0039] 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 in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] like Figure 1 , Figure 4 , Figure 5 and Figure 8 As shown, some embodiments of this application provide a single cell battery. The single cell battery has a first direction X and a second direction Y that are perpendicular to each other. The protrusion 300 forms a reinforcing structure around the explosion-proof valve 120 to improve the overall impact resistance of the bottom wall 110 and ensure the stability and safety of the explosion-proof valve 120.

[0041] The single cell includes a casing 100, a top cover 500, and an electrode assembly 200.

[0042] The housing 100 has a bottom wall 110, which is equipped with an explosion-proof valve 120. The explosion-proof valve 120 controls the internal pressure of the individual battery cells, thereby preventing the individual battery cells from exploding. When excessive pressure is generated inside the individual battery cells, the explosion-proof valve 120 will open under the pressure, thereby releasing the high-pressure gas generated inside the individual battery cells into the external environment, thus reducing the internal pressure of the individual battery cells and effectively preventing the risk of individual battery cell explosions.

[0043] The top cover 500 is connected to one end of the housing 100 along the first direction X. The connection method between the top cover 500 and the housing 100 includes at least one of snap-fit, bonding, interference fit, welding, and threaded connection, which can be specifically set according to the actual situation.

[0044] The top cover 500 and the bottom wall 110 are arranged opposite each other along the first direction X, so as to seal the housing 100 along the first direction X by means of the top cover 500, that is, to seal the housing 100 by means of the top cover 500, thereby forming a sealed space inside the housing 100.

[0045] The electrode assembly 200 is disposed within the housing 100, that is, within the aforementioned sealed space. The housing 100 and the top cover 500 provide a sealed protection for the electrode assembly 200, preventing external impurities or liquids from entering and ensuring its safety within the housing 100. Simultaneously, the top cover 500 and the inner wall of the housing 100 provide left and right restraints to the electrode assembly 200, ensuring its stability within the housing 100.

[0046] In addition, a protrusion 300 is formed on the bottom wall 110 along the first direction X, away from the electrode assembly 200, to increase the bending stiffness of the bottom wall 110. At the same time, when the bottom wall 110 is subjected to pressure or impact, the protrusion 300 can disperse the stress of the impact, thereby avoiding excessive local deformation. The protrusion 300 divides the bottom wall 110 into multiple regions, which can reduce the critical load of buckling and significantly improve the strength and stability of the bottom wall 110. Moreover, the protrusion 300 is set on the side away from the electrode assembly 200, which not only improves the strength of the bottom wall 110, but also ensures the energy density of the single battery and ensures the stability and safety of the explosion-proof valve 120.

[0047] In this embodiment, the protrusion 300 includes a first protrusion 310 and a second protrusion 320. The first protrusion 310 and the second protrusion 320 are arranged on opposite sides along the second direction Y. The explosion-proof valve 120 is spaced between the first protrusion 310 and the second protrusion 320 along the second direction Y. The first protrusion 310 and the second protrusion 320 can evenly distribute the impact force on the bottom wall 110 near the explosion-proof valve 120, avoid stress concentration, achieve the effect of uniform load distribution, improve the torsional stiffness of the bottom wall 110, and increase the critical buckling load.

[0048] It is understandable that by arranging the first protrusion 310 and the second protrusion 320 along the second direction Y on both opposite sides of the explosion-proof valve 120, not only can the load borne by the bottom wall 110 around the explosion-proof valve 120 be evenly distributed, but the bending and compressive strength of the bottom wall 110 at the explosion-proof valve 120 can also be improved, thereby ensuring the stability and safety of the explosion-proof valve 120 on the bottom wall 110.

[0049] Optionally, in some embodiments, there are multiple first protrusions 310 and multiple second protrusions 320, with the multiple first protrusions 310 arranged along a first direction X or a second direction Y, and the multiple second protrusions 320 arranged along a first direction X or a second direction Y.

[0050] like Figure 4 , Figure 6 and Figure 7 As shown, in some embodiments of this application, the first protrusion 310 is recessed on the side near the electrode assembly 200 in a direction away from the electrode assembly 200 to form a first clearance groove 130. The projection of the first clearance groove 130 on the bottom wall 110 has the same shape as the projection of the first protrusion 310 on the bottom wall 110. The shape of the projection of the first protrusion 310 on the bottom wall 110 can be at least one of a polygon, a circle, an ellipse, or a letter shape, and can be specifically set according to actual conditions.

[0051] Furthermore, the second protrusion 320 is recessed on the side near the electrode assembly 200 in a direction away from the electrode assembly 200 to form a second clearance groove 140. The projection of the second clearance groove 140 on the bottom wall 110 has the same shape as the projection of the second protrusion 320 on the bottom wall 110. The shape of the projection of the second protrusion 320 on the bottom wall 110 can be at least one of polygon, circle, ellipse, and letter shape, and can be specifically set according to the actual situation.

[0052] In this embodiment, the single battery cell further includes a base plate 400. The base plate 400 has a first positioning part 410 and a second positioning part 420 on the side facing the bottom wall 110. The first positioning part 410 is received in the first clearance groove 130 to form a limiting connection structure through the first positioning part 410 and the groove wall of the first clearance groove 130. The second positioning part 420 is received in the second clearance groove 140 to form a limiting connection structure through the groove wall of the second positioning part 420 and the second clearance groove 140, thereby improving the assembly efficiency and connection stability between the base plate 400 and the bottom wall 110.

[0053] It should be noted that by setting the first relief groove 130 and the second relief groove 140, the energy density of the electrode assembly 200 can be guaranteed and the space utilization rate on the bottom wall 110 can be improved. By filling the first positioning part 410 into the first relief groove 130 and the second positioning part 420 into the second relief groove 140, the mechanical interlock is formed by the engagement of the protrusion with the groove wall of the relief groove, which significantly resists the shear force and delamination force parallel to the bottom wall 110, and can improve the mechanical properties of the bottom wall 110 at the first relief groove 130 and the second relief groove 140.

[0054] In this embodiment, both the first positioning part 410 and the second positioning part 420 are protrusions. The surface of the first positioning part 410 is in contact with the groove wall of the first clearance groove 130 to form a limiting connection structure; the surface of the second positioning part 420 is in contact with the groove wall of the second clearance groove 140 to form a limiting connection structure. Thus, the first positioning part 410 can also provide support for the groove wall of the first clearance groove 130, and the second positioning part 420 can provide support for the groove wall of the second clearance groove 140, thereby improving the impact resistance and deformation resistance of the bottom wall 110 in the first clearance groove 130 and the second clearance groove 140, thereby further improving the overall strength of the bottom wall 110 near the explosion-proof valve 120, forming a protective structure for the explosion-proof valve 120, and improving the stability and safety of the explosion-proof valve 120 on the bottom wall 110.

[0055] like Figure 4As shown, in some embodiments of this application, the single cell has a third direction Z that is mutually perpendicular to the first direction X and the second direction Y. The protrusion 300 further includes a third protrusion 330, which is spaced apart from the first protrusion 310 and the second protrusion 320 along the third direction Z.

[0056] The bottom wall 110 is provided with the third protrusion 330 on both opposite sides along the third direction Z, and the explosion-proof valve 120 is spaced between two adjacent third protrusions 330 along the third direction Z.

[0057] In some embodiments, the first protrusion 310, the second protrusion 320 and the third protrusion 330 are arranged at intervals to distribute the load over a larger area, thereby avoiding stress concentration at a single location and further improving the overall bending strength and torsional stiffness of the bottom wall 110.

[0058] The third protrusion 330 is provided to further enhance the compressive strength and bending strength of the bottom wall 110 around the explosion-proof valve 120, thereby improving the stability and safety of the explosion-proof valve 120.

[0059] The shape of the projection of the third protrusion 330 onto the bottom wall 110 can be at least one of polygon, circle, ellipse, or letter shape, and can be specifically set according to the actual situation.

[0060] like Figures 4 to 7 As shown, in some embodiments of this application, the third protrusion 330 is recessed on the side near the electrode assembly 200 in a direction away from the electrode assembly 200 to form a third clearance groove 150. The projection of the third clearance groove 150 on the bottom wall 110 has the same shape as the projection of the third protrusion 330 on the bottom wall 110. The shape of the projection of the third protrusion 330 on the bottom wall 110 can be at least one of polygon, circle, ellipse, and letter shape, and can be specifically set according to the actual situation.

[0061] The bottom support plate 400 is provided with a third positioning part 450 on the side facing the bottom wall 110. The third positioning part 450 is received in the third relief groove 150, so as to form a limiting connection structure through the third positioning part 450 and the groove wall of the third relief groove 150, thereby further improving the assembly efficiency and connection stability between the bottom support plate 400 and the bottom wall 110.

[0062] It should be noted that by filling the third positioning part 450 into the third relief groove 150, a mechanical interlock is formed by the engagement of the third positioning part 450 with the groove wall of the third relief groove 150, which significantly resists the shear force and delamination force parallel to the bottom wall 110, thereby improving the mechanical properties of the bottom wall 110 at the third relief groove 150.

[0063] like Figure 3 As shown, in some embodiments of this application, the third protrusion 330 includes a plurality of first protrusion segments 331. The first protrusion segments 331 are spaced apart from the first protrusion 310 and the second protrusion 320 along the third direction Z. The plurality of first protrusion segments 331 are arranged spaced apart along the second direction Y. The number of first protrusion segments 331 can be specifically set according to actual conditions. The explosion-proof valve 120 is spaced apart from the first protrusion segments 310 along the third direction Z, so as to enhance the strength of the bottom wall 110 at the explosion-proof valve 120 through the first protrusions 310.

[0064] In some embodiments, a plurality of first protrusions 331 are arranged at equal intervals along the second direction Y to improve the uniformity of pressure or impact force borne by each first protrusion 331. By increasing the number of first protrusions 331, a "skeleton structure" can be formed on the side of the bottom wall 110 away from the single cell, which can significantly improve the bending stiffness and torsional stiffness of the bottom wall 110. The load borne by the bottom wall 110 on the first protrusions 331 can be dispersed to avoid stress concentration at a single location, thereby improving the overall strength and mechanical properties of the bottom wall 110.

[0065] like Figure 3 As shown, in some embodiments of this application, the third protrusion 330 further includes at least one second protrusion segment 332. It is understood that the number of second protrusion segments 332 can be one, two or more, and can be specifically set according to the actual situation.

[0066] In some embodiments, the number of second protrusions 332 is multiple, and the multiple second protrusions 332 are arranged at intervals along the third direction Z.

[0067] The second protruding segment 332 extends along the second direction Y and is connected to multiple first protruding segments 331 to form a spatial truss structure on the side of the bottom wall 110 away from the single battery cell. This allows the local load on the bottom wall 110 to be quickly distributed to the entire plane of the bottom wall 110 through the connected first protruding segments 331 and second protruding segments 332, thereby significantly improving the stiffness of the bottom wall 110. By connecting the first protruding segments 331 and second protruding segments 332 to each other, the stress on the bottom wall 110 can be continuously transmitted, avoiding local stress concentration, thereby further improving the strength of the bottom wall 110 at the third protrusion 330 and improving the stability of the overall structure.

[0068] like Figure 2 and Figure 3 As shown, in some embodiments of this application, the height of the first positioning part 410 along the first direction X is greater than the depth of the first clearance groove 130, and / or the height of the second positioning part 420 along the first direction X is greater than the depth of the second clearance groove 140.

[0069] It is understood that in some embodiments, the height of the first positioning part 410 along the first direction X is greater than the depth of the first clearance groove 130, or the height of the second positioning part 420 along the first direction X is greater than the depth of the second clearance groove 140.

[0070] In this embodiment, the height of the first positioning part 410 along the first direction X is greater than the depth of the first clearance groove 130, and the height of the second positioning part 420 along the first direction X is greater than the depth of the second clearance groove 140. An exhaust space 600 is formed by spacing the side of the bottom support plate 400 facing the bottom wall 110 and the side of the bottom wall 110 facing the bottom support plate 400. The exhaust space 600 is connected to the explosion-proof valve 120 so that the gas generated by the single battery during operation can enter the explosion-proof valve 120 through the exhaust space 600 to ensure exhaust efficiency.

[0071] It should be noted that there is a gap between the edge of the bottom plate 400 and the inner wall of the housing 100. This gap is connected to the exhaust space 600 so that the gas generated during the operation of the single cell can enter the exhaust space 600 through the gap between the bottom plate 400 and the inner wall of the housing 100, and then be guided to the explosion-proof valve 120 through the exhaust space 600 to achieve the purpose of depressurization.

[0072] like Figure 7 As shown, in some embodiments of this application, the base plate 400 is provided with a plurality of through holes 430 extending along the first direction X, and the number of through holes 430 can be specifically set according to the actual situation.

[0073] The plurality of through holes 430 are spaced apart on two opposite sides along the second direction Y. The through holes 430 connect the electrode assembly 200 and the exhaust space 600, so that the gas generated by the operation of the single cell can enter the exhaust space 600 through the through holes 430 to further improve the exhaust efficiency.

[0074] In addition, by increasing the number of through holes 430, the flow rate from the individual cell to the exhaust space 600 per unit time can be increased, thereby effectively improving the exhaust efficiency.

[0075] like Figure 7 As shown, in some embodiments of this application, the bottom support plate 400 is provided with a guide groove 440 on the side facing the bottom wall 110. The through hole 430 is connected to the exhaust space 600 through the guide groove 440. The opening of the guide groove 440 faces the bottom wall 110, so that the gas flowing through the through hole 430 can enter the guide groove 440 to expand the effective flow area of ​​the through hole 430, reduce airflow resistance, prevent pressure from accumulating at the through hole 430, and also avoid the formation of vortices at the edge of the through hole 430, thereby improving exhaust efficiency.

[0076] Secondly, this application provides a battery pack that includes the individual battery cells in any of the above embodiments.

[0077] It is understood that the battery pack has the beneficial effects of the individual cells in any of the above embodiments, which will not be elaborated here.

[0078] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0079] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0080] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A unit cell having a first direction (X) and a second direction (Y) perpendicular to each other, characterized by, include: The housing (100) has a bottom wall (110) provided with an explosion-proof valve (120). A top cover (500) is connected to one end of the housing (100) along the first direction (X), and the top cover (500) and the bottom wall (110) are disposed opposite each other along the first direction (X); An electrode assembly (200) is disposed within the housing (100); The bottom wall (110) protrudes in the direction away from the electrode assembly (200) along the first direction (X) to form a protrusion (300). The protrusion (300) includes a first protrusion (310) and a second protrusion (320). The first protrusion (310) and the second protrusion (320) are arranged opposite to each other along the second direction (Y). The explosion-proof valve (120) is spaced between the first protrusion (310) and the second protrusion (320) along the second direction (Y).

2. The cell according to claim 1, wherein The first protrusion (310) is recessed on the side near the electrode assembly (200) in a direction away from the electrode assembly (200) to form a first clearance groove (130), and the second protrusion (320) is recessed on the side near the electrode assembly (200) in a direction away from the electrode assembly (200) to form a second clearance groove (140). The single battery also includes a base plate (400), on which a first positioning part (410) and a second positioning part (420) are provided on the side facing the bottom wall (110). The first positioning part (410) is received in the first clearance groove (130), and the second positioning part (420) is received in the second clearance groove (140).

3. The cell according to claim 2, wherein The single battery cell has a third direction (Z) that is perpendicular to both the first direction (X) and the second direction (Y). The protrusion (300) also includes a third protrusion (330). The third protrusion (330) is spaced apart from the first protrusion (310) and the second protrusion (320) along the third direction (Z). The bottom wall (110) is provided with the third protrusion (330) on both opposite sides along the third direction (Z). The explosion-proof valve (120) is spaced apart between two adjacent third protrusions (330) along the third direction (Z).

4. The single-cell battery according to claim 3, characterized in that, The third protrusion (330) is recessed on the side near the electrode assembly (200) in a direction away from the electrode assembly (200) to form a third relief groove (150). The bottom support plate (400) has a third positioning part (450) on the side facing the bottom wall (110), and the third positioning part (450) is received in the third clearance groove (150).

5. The single-cell battery according to claim 4, characterized in that, The third protrusion (330) includes a plurality of first protrusion segments (331), the first protrusion segments (331) are spaced apart from the first protrusion (310) and the second protrusion (320) along the third direction (Z), the plurality of first protrusion segments (331) are arranged spaced apart along the second direction (Y), and the explosion-proof valve (120) is spaced apart from the first protrusion segments (331) along the third direction (Z).

6. The single-cell battery according to claim 5, characterized in that, The third protrusion (330) further includes at least one second protrusion segment (332), which extends along a second direction (Y) and is connected to a plurality of first protrusion segments (331).

7. The single-cell battery according to claim 6, characterized in that, The height of the first positioning part (410) along the first direction (X) is greater than the depth of the first clearance groove (130), and / or the height of the second positioning part (420) along the first direction (X) is greater than the depth of the second clearance groove (140). The bottom support plate (400) facing the bottom wall (110) and the bottom wall (110) facing the bottom support plate (400) form an exhaust space (600) at intervals. The exhaust space (600) is connected to the explosion-proof valve (120).

8. The single-cell battery according to claim 7, characterized in that, The base plate (400) is provided with a plurality of through holes (430) extending along the first direction (X), the plurality of through holes (430) being spaced apart on two opposite sides along the second direction (Y), and the through holes (430) connecting the electrode assembly (200) and the exhaust space (600).

9. The single-cell battery according to claim 8, characterized in that, The bottom support plate (400) has a guide groove (440) on the side facing the bottom wall (110), and the through hole (430) is connected to the exhaust space (600) through the guide groove (440).

10. A battery pack, characterized in that, The single-cell battery includes any one of claims 1 to 9.

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