Battery cell

Abstract

The utility model discloses a battery monomer, and relates to the technical field of batteries. The battery monomer comprises a shell, a battery cell, a first cover plate and a first reinforcing part, the shell is provided with an accommodating cavity and a first opening communicated with the accommodating cavity; the battery cell is arranged in the accommodating cavity; the first cover plate is connected with the shell to cover and seal the first opening, the first cover plate is provided with a first surface and a second surface which are deviated from each other, the first surface is arranged on one side far away from the battery cell, the second surface is arranged on one side close to the battery cell, and the first cover plate is provided with a liquid injection hole penetrating through the first surface and the second surface; the first reinforcing part is connected with the first cover plate and protrudes towards the battery cell relative to the second surface, and the first reinforcing part is arranged on the periphery of the liquid injection hole, so that the stress concentration of a peripheral material of the liquid injection hole can be reduced, and the strength and the stability of the overall structure of the first cover plate are improved; and the deformation risk of the first cover plate under the pressure or impact of the battery is inhibited.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer. BACKGROUND

[0002] The battery monomer comprises a shell, an electric core arranged in the shell, and two cover plates arranged at opposite ends of the shell. When the battery is used at the end, the electric core in the shell produces more gas, which is easy to cause the shell and the cover plate to be deformed under the action of gas pressure. Alternatively, when the battery is impacted by external force, the cover plate will also be deformed. The deformation of the cover plate will also cause the insulation performance of the lower plastic to fail, causing the short circuit of the pole and the cover plate. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present application is to provide a battery monomer to solve the technical problem that the cover plate is easy to deform under pressure or impact.

[0004] To achieve the above purpose, the present application provides a battery monomer, comprising: a shell, the shell having a receiving cavity and a first opening communicating with the receiving cavity; an electric core, the electric core being arranged in the receiving cavity; a first cover plate, the first cover plate being connected with the shell and sealing the first opening, the first cover plate having a first surface and a second surface which are away from each other, the first surface being arranged on the side away from the electric core, the second surface being arranged on the side close to the electric core, the first cover plate being provided with a liquid injection hole penetrating the first surface and the second surface; and a first reinforcing part, the first reinforcing part being connected with the first cover plate and being arranged protruding towards the electric core relative to the second surface, wherein the first reinforcing part is arranged on the outer periphery of the liquid injection hole.

[0005] In some embodiments, the first reinforcing part is a first sunken platform, one side of the first sunken platform is recessed below the first surface, and the other side of the first sunken platform is protruded from the second surface.

[0006] In some embodiments, the area of the first sunken platform is S1, the area of the first surface is S2, and S1 / S2≥0.005.

[0007] In some embodiments, the liquid injection hole is provided with a mounting surface for mounting a sealing cover and a mounting hole penetrating the mounting surface, the mounting surface is located between the first surface and the second surface, and a mounting plug is arranged in the mounting hole.

[0008] In some embodiments, the battery monomer further comprises a lower plastic, the lower plastic being arranged on the second surface, and the lower plastic being provided with a groove for accommodating the first reinforcing part.

[0009] In some embodiments, the shell further has a second opening in communication with the accommodating cavity; the battery cell further comprises: a second cover plate connected to the shell to seal the second opening, the second cover plate having a third surface and a fourth surface facing away from each other, the third surface being arranged on a side away from the battery cell, and the fourth surface being arranged on a side close to the battery cell, the second cover plate being provided with an explosion-proof hole penetrating through the third surface and the fourth surface, and an explosion-proof valve being arranged in the explosion-proof hole; and a second reinforcing portion connected to the second cover plate and protruding towards the battery cell relative to the fourth surface, wherein the second reinforcing portion is arranged between the explosion-proof hole and the edge of the second cover plate.

[0010] In some embodiments, the second reinforcing portion is a second sunken platform, one side of the second sunken platform being recessed from the third surface, and the other side of the second sunken platform protruding from the fourth surface.

[0011] In some embodiments, the second sunken platform has a surface area S3, the third surface has a surface area S4, and S3 / S4≥0.005.

[0012] In some embodiments, the distance between the outer contour of the explosion-proof hole and the outer edge of the second reinforcing portion is greater than or equal to 5 mm.

[0013] In some embodiments, the first cover plate or the second cover plate is provided with a pole hole, and a pole is arranged in the pole hole.

[0014] The technical effect of the present application is to provide a battery cell, by arranging a first reinforcing portion on the outer periphery of the liquid injection hole, the stress concentration of the material on the outer periphery of the liquid injection hole can be reduced, thereby improving the strength and stability of the overall structure of the first cover plate, and inhibiting the risk of deformation of the first cover plate under pressure or impact.

[0015] By arranging a second reinforcing portion on the second cover plate, on the one hand, the structural strength of the second cover plate can be strengthened, and the deformation of the second cover plate under the action of air pressure at the end of the use of the battery can be inhibited, on the other hand, when the battery cell moves a certain distance, it will be blocked by the second protruding platform, thereby stopping moving, and will not contact the second cover plate, and will not cause blockage of the explosion-proof valve. BRIEF DESCRIPTION OF DRAWINGS

[0016] The technical solutions and other beneficial effects of the present application will become apparent through the following detailed description of specific embodiments of the present application, combined with the accompanying drawings.

[0017] Figure 1 The overall structure schematic diagram of the battery cell provided by the embodiments of the present application is shown.

[0018] Figure 2 The partial exploded structure schematic diagram of the battery cell provided by the embodiments of the present application is shown.

[0019] Figure 3A structure schematic view of the side of the first cover plate away from the battery cell is provided for the embodiment of the present application.

[0020] Figure 4 A structure schematic view of the side of the first cover plate toward the battery cell is provided for the embodiment of the present application.

[0021] Figure 5 A structure schematic view of the side of the second cover plate away from the battery cell is provided for the embodiment of the present application.

[0022] Figure 6 A structure schematic view of the side of the second cover plate toward the battery cell is provided for the embodiment of the present application.

[0023] The component identification of the drawings is as follows:

[0024] 1 housing; 10 accommodating cavity; 11 first opening; 12 second opening; 2 battery cell; 3 first cover plate;

[0025] 31 first surface; 32 second surface; 30 first reinforcing part; 33 liquid injection hole; 331 mounting surface; 332 mounting hole; 333 sealing cover; 334 mounting rubber plug; 34 pole hole; 4 lower plastic; 40 groove; 5 second cover plate; 51 third surface; 52 fourth surface; 53 explosion-proof hole; 50 second reinforcing part; 6 explosion-proof valve; 7 pole; 8 upper plastic; 9 sealing ring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person skilled in the art without any creative work fall within the protection scope of the present application.

[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are 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, and therefore should not be construed as a limitation of this application. 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between 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.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being 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 includes the first feature being 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.

[0030] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplifying the present application, the components and arrangements of the specific examples described below are intended to be examples only. Of course, they are not meant to limit the present application in any way. Furthermore, the present application can be implemented in a wide variety of other ways not expressly described herein. Also, the present application provides various examples of specific processes and materials. However, one skilled in the art will recognize that other processes and / or materials can be used.

[0031] To solve the technical problem that the cover plate is prone to deformation under pressure or impact. The battery monomer provided by the embodiment of the application includes a shell, an electric core, a first cover plate, and a first reinforcing part. The shell has a containing cavity and a first opening communicating with the containing cavity. The electric core is arranged in the containing cavity. The first cover plate is connected with the shell to seal the first opening. The first cover plate has a first surface and a second surface which are away from each other. The first surface is arranged on a side away from the electric core, and the second surface is arranged on a side close to the electric core. The first cover plate is provided with a liquid injection hole penetrating through the first surface and the second surface. The first reinforcing part is connected with the first cover plate and is arranged in a protruding manner relative to the second surface. The first reinforcing part is arranged on the outer periphery of the liquid injection hole. Therefore, by arranging the first reinforcing part on the outer periphery of the liquid injection hole, the stress concentration of the material on the outer periphery of the liquid injection hole can be reduced, so that the strength and stability of the overall structure of the first cover plate are improved, and the risk of deformation of the first cover plate under pressure or impact of the battery is inhibited. The following will be described in detail.

[0032] As shown in Figures 1 to 2 , the battery monomer includes a shell 1, an electric core 2, a first cover plate 3, and a first reinforcing part 30.

[0033] The shell 1 has a containing cavity 10 and a first opening 11 communicating with the containing cavity 10. The electric core 2 is arranged in the containing cavity 10. The containing cavity 10 of the shell 1 can provide a good working environment for the electric core 2 and other important structures in the battery. The shell 1 plays a protective role for these structures, avoiding damage caused by external factors.

[0034] As shown in Figures 2 to 4 , the first cover plate 3 is connected with the shell 1 to seal the first opening 11. The first cover plate 3 has a first surface 31 and a second surface 32 which are away from each other. The first surface 31 is arranged on a side away from the electric core 2, and the second surface 32 is arranged on a side close to the electric core 2. The first cover plate 3 is provided with a liquid injection hole 33 penetrating through the first surface 31 and the second surface 32.

[0035] The first reinforcing part 30 is connected with the first cover plate 3 and protrudes towards the battery cell 2 relative to the second surface 32. The first reinforcing part 30 is arranged at the outer periphery of the liquid injection hole 33 to strengthen the structural strength of the first cover plate 3 and prevent the first cover plate 3 from being deformed by air pressure at the end of the battery life. Through tests, after the first reinforcing part 30 is arranged on the first cover plate 3, the thickness of the first cover plate 3 is reduced by at least 1 mm relative to the first cover plate 3 before deformation.

[0036] The first reinforcing part 30 is a first sunken platform. One side of the first sunken platform is recessed relative to the first surface 31, as shown in Figure 3 The other side of the first sunken platform protrudes relative to the second surface 32, as shown in Figure 4 From the structure, the first reinforcing part 30 is recessed on the side away from the battery cell 2 and protrudes on the side towards the battery cell 2. The first reinforcing part 30 is a hollow structure, which can reduce the weight of the first reinforcing part 30 and the amount of processing material, thereby reducing the cost of structure production.

[0037] The shape of the first sunken platform can be oval, circular, square or other special-shaped patterns, which are not particularly limited herein. The structure of the first reinforcing part 30 can be formed by stamping process.

[0038] The liquid injection hole 33 is provided with a mounting surface 331 for mounting a sealing cover 333 and a mounting hole 332 penetrating the mounting surface 331. The mounting surface 331 is located between the first surface 31 and the second surface 32. The mounting hole 332 is provided with a mounting plug 334. In the mounting process, the electrolyte is first injected from the liquid injection hole 33 into the cavity 10 of the shell 1, then the mounting plug 334 is inserted into the mounting hole 332, and finally the sealing cover 333 is mounted on the mounting surface 331 to seal the liquid injection hole 33, so as to prevent the electrolyte from flowing out of the liquid injection hole 33.

[0039] The area of the first sunken platform is S1 and the area of the first surface 31 is S2. S1 / S2≥0.005. By increasing the area of the first sunken platform, the structural strength of the first cover plate 3 can be further strengthened, and the deformation of the first cover plate 3 caused by air pressure at the end of the battery life can be prevented.

[0040] Figure 3 and Figure 4 It is shown that the first sunken platform is oval. Therefore, the area formula of the first sunken platform is S1=π×a1×b1, a1>b1, wherein π is the circular constant, a1 is the length of the major axis of the first sunken platform, and b1 is the length of the minor axis of the first sunken platform.

[0041] Figure 3 and Figure 4The first cover plate 3 is rectangular, and the area of the first cover plate 3 is S2 = m1*n1, where m1 is the length of the long side of the first cover plate 3, and n1 is the length of the short side of the first cover plate 3.

[0042] The battery monomer further comprises a lower plastic 4 disposed on the side of the first cover plate 3 close to the battery cell 2, i.e. on the second surface 32. The lower plastic 4 is provided with a groove 40 for accommodating the first reinforcing part 30. Therefore, during the assembly of the first cover plate 3 and the lower plastic 4, the protruding part of the first reinforcing part 30 is guided by the first reinforcing part 30 to be matched with the groove, so as to realize the mutual fixation of the first cover plate 3 and the lower plastic 4.

[0043] Since the first cover plate 3 is provided with the first reinforcing part 30 to strengthen the structural strength of the first cover plate 3 and prevent the first cover plate 3 from being deformed by the air pressure at the end of the battery use, the problem of the insulation performance of the lower plastic 4 being invalid due to the deformation of the first cover plate 3 is avoided, thereby avoiding the problem of short circuit caused by the contact between the pole and the first cover plate 3.

[0044] As shown in Figure 2 , the shell 1 further has a second opening 12 communicating with the accommodating cavity 10. Figure 2 The second opening 12 and the first opening 11 are respectively located at opposite ends of the shell 1. In other embodiments, they can also be located at different sides of the shell 1, which is not particularly limited here.

[0045] As shown in Figure 2 , Figure 5 , and Figure 6 , the battery monomer further comprises a second cover plate 5 connected with the shell 1 to cover and seal the second opening 12. The second cover plate 5 has a third surface 51 and a fourth surface 52 facing away from each other, the third surface 51 is disposed on the side away from the battery cell 2, and the fourth surface 52 is disposed on the side close to the battery cell 2. The second cover plate 5 is provided with an explosion-proof hole 53 penetrating through the third surface 51 and the fourth surface 52, and the explosion-proof hole 53 is provided with an explosion-proof valve 6. When the internal pressure of the battery monomer is too high, the explosion-proof valve 6 will automatically open to release the internal gas and prevent the battery shell 1 from exploding due to the high pressure.

[0046] The battery cell also includes a second reinforcing portion 50, which is connected to the second cover plate 5 and protrudes towards the cell 2 relative to the fourth surface 52. The second reinforcing portion 50 is positioned between the explosion-proof hole 53 and the edge of the second cover plate 5, reducing stress concentration in the material near the explosion-proof hole 53, thereby improving the overall strength and stability of the second cover plate 5 and reducing the risk of deformation under pressure or impact. Tests have shown that after the second reinforcing portion 50 is installed on the second cover plate 5, the structure of the second reinforcing portion 50 can reduce the thickness deformation of the second cover plate 5 by at least 1 mm compared to the undeformed second cover plate 5.

[0047] like Figures 5 to 6 As shown, the second reinforcing part 50 is a second recessed platform, one side of which is recessed into the third surface 51, as shown in the figure. Figure 5 The other side of the second sinking platform protrudes from the fourth surface 52, as shown in the reference. Figure 6 Structurally, the second reinforcing part 50 is recessed on the side away from the battery cell 2 and protrudes on the side facing the battery cell 2. The second reinforcing part 50 is hollow, which can reduce the weight of the second reinforcing part 50 and reduce the amount of processing materials used, thereby reducing the cost of structural production.

[0048] The shape of the second sinking platform can be elliptical, circular, square, or other irregular shapes, and there are no particular limitations here. The structure of the second reinforcing part 50 can be formed by stamping.

[0049] The area of ​​the second sinking platform is S3, and the area of ​​the third surface 51 is S4. S3 and S4 satisfy: S3 / S4≥0.005. By increasing the area of ​​the second sinking platform, the structural strength of the second cover plate 5 can be further enhanced, and the deformation of the second cover plate 5 due to air pressure at the end of the battery's use can be suppressed.

[0050] Figure 5 and Figure 6 The second platform is shown to be elliptical. Therefore, the area formula of the second platform is: S3=π×a2×b2, a2>b2, where π is pi, a2 is the length of the major semi-axis of the second platform, and b2 is the length of the minor semi-axis of the second platform.

[0051] Figure 5 and Figure 6 The second cover plate 5 is shown to be rectangular. Therefore, the area formula of the second cover plate 5 is: S2=m2×n2,m2>n2,where m2 is the length of the long side of the second cover plate 5 and n2 is the length of the short side of the second cover plate 5.

[0052] The number of second reinforcing parts 50 is at least two, and at least two second reinforcing parts 50 are respectively disposed on both sides of the explosion-proof valve 6. By providing second reinforcing parts 50 on the second cover plate 5, the structural strength of the second cover plate 5 is improved, and the problem of the explosion-proof valve 6 being unable to release pressure in time due to the deformation of the second cover plate 5 is avoided.

[0053] It is understandable that at least two second reinforcing parts 50 can be provided on the second cover plate 5. When the battery experiences thermal runaway and the cell 2 moves towards the second cover plate 5, at least two second reinforcing parts can simultaneously block the moving cell 2. Compared to a single second reinforcing part 50, at least two second reinforcing parts 50 can improve the blocking and spacing effect, preventing a single second reinforcing part 50 from collapsing or being damaged due to insufficient strength when blocking the cell 2. At the same time, at least two second reinforcing parts 50 are respectively provided on both sides of the explosion-proof valve 6. Preferably, the second reinforcing parts 50 provided on both sides of the explosion-proof valve 6 are symmetrical. When at least two second reinforcing parts 50 block the cell 2, the force exerted by the second reinforcing parts 50 on the cell 2 is more uniform, providing better support for one end of the cell 2. The thrust of the gas on the other end of the cell 2 can be balanced with the supporting force of the at least two second reinforcing parts 50, reducing the probability of the cell 2 tilting and ensuring the safety of the cell 2 to a certain extent. The opposing and misaligned forces of the second reinforcing parts 50 on both sides of the explosion-proof valve 6 act on the battery cell 2, which may cause lithium plating in the battery cell 2.

[0054] The distance between the outer contour of the explosion-proof hole 53 and the outer edge of the second reinforcing part 50 is greater than or equal to 5mm, which reduces the stress concentration of the material near the explosion-proof hole 53, thereby improving the overall strength and stability of the second cover plate 5 and reducing the risk of deformation under pressure or impact.

[0055] like Figure 2 As shown, the first cover plate 3 or the second cover plate 5 is provided with a terminal post hole 34, and a terminal post 7 is provided in the terminal post hole 34. For large-capacity batteries, the explosion-proof valve 6 installed on it has a large area, so the explosion-proof valve 6 and the terminal post 7 are generally located on different sides of the battery. In this embodiment, the terminal post 7 is located on the first cover plate 3, and the explosion-proof valve 6 is located on the second cover plate 5. The second cover plate 5 and the first cover plate 3 are located on different sides of the housing 1, which can ensure that the explosion-proof valve 6 and the terminal post 7 are located on different sides of the battery. This facilitates the installation of a large-area explosion-proof valve 6 on a large-capacity battery, and can also initially achieve thermoelectric separation, reducing the impact of the high-temperature gas discharged when the explosion-proof valve 6 is released on the terminal post 7.

[0056] When a battery with the explosion-proof valve 6 and the terminal post 7 located on different sides experiences thermal runaway, a large amount of gas may be generated inside. This gas may push the battery cell 2 towards the explosion-proof valve 6. Since the second reinforcing part 50 protrudes from the side of the second cover plate 5 facing the battery cell 2, when the battery cell 2 moves a certain distance, it will be blocked by the second reinforcing part 50, thus stopping its movement and preventing it from contacting the second cover plate 5. Therefore, it will not block the explosion-proof valve 6 (which is located on the second cover plate 5).

[0057] The second cover plate 5 and the second reinforcing part 50 are provided with an insulating member (not shown) on the side facing the battery cell 2, or the second cover plate 5 and the second reinforcing part 50 are provided with an insulating film on the surface of the side facing the battery cell 2, for insulating the second cover plate 5 from the battery cell 2 and preventing the second cover plate 5 from being electrically connected to the battery cell 2.

[0058] Therefore, by providing a second reinforcing part 50 on the second cover plate 5, on the one hand, the structural strength of the second cover plate 5 can be strengthened and the deformation of the second cover plate 5 due to air pressure at the end of the battery's use can be suppressed. On the other hand, when the battery cell 2 moves a certain distance, it will be blocked by the second reinforcing part 50, thereby stopping its movement and preventing it from contacting the second cover plate 5, thus preventing blockage of the explosion-proof valve 6.

[0059] like Figure 2 As shown, the battery cell also includes an upper plastic and a sealing ring. The upper plastic is disposed on the side of the first cover plate 3 away from the cell 2 and has a through hole communicating with the terminal hole 34. The sealing ring is sleeved on the outer surface of the terminal 7 to separate the terminal 7 from the first cover plate 3 in the radial direction of the terminal hole 34, so as to prevent the terminal 7 from being electrically connected to the first cover plate 3.

[0060] The battery pack comprises the aforementioned multiple battery cells. These battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment does not limit the specific types. The battery pack provides power to the electrical device. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, and power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, 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 include 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, etc.

[0061] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0062] The above describes in detail a battery cell provided by the embodiments of the present application, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the technical solutions of the present application and the core ideas thereof. Those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that, include: A housing having a receiving cavity and a first opening communicating with the receiving cavity; A battery cell, wherein the battery cell is disposed within the receiving cavity; A first cover plate is connected to the housing and covers the first opening. The first cover plate has a first surface and a second surface that are opposite to each other. The first surface is located on the side away from the battery cell, and the second surface is located on the side close to the battery cell. The first cover plate is provided with a liquid injection hole that penetrates the first surface and the second surface. A first reinforcing part is connected to the first cover plate and protrudes toward the battery cell relative to the second surface, wherein the first reinforcing part is disposed on the outer periphery of the injection hole.

2. The battery cell according to claim 1, characterized in that, The first reinforcing part is a first recessed platform, one side of which is recessed into the first surface, and the other side of which protrudes from the second surface.

3. The battery cell according to claim 2, characterized in that, The area of ​​the first settling platform is S1, and the area of ​​the first surface is S2. S1 and S2 satisfy: S1 / S2≥0.

005.

4. The battery cell according to claim 1, characterized in that, The injection hole has a mounting surface for installing a sealing cap and a mounting hole that penetrates the mounting surface. The mounting surface is located between the first surface and the second surface, and a mounting plug is provided in the mounting hole.

5. The battery cell according to claim 1, characterized in that, The battery cell also includes: The lower plastic is disposed on the second surface, and the lower plastic has a groove for accommodating the first reinforcing part.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The housing also has a second opening communicating with the receiving cavity; The battery cell also includes: The second cover plate is connected to the housing and seals the second opening. The second cover plate has a third surface and a fourth surface that are opposite to each other. The third surface is located on the side away from the battery cell, and the fourth surface is located on the side close to the battery cell. The second cover plate is provided with an explosion-proof hole that penetrates the third surface and the fourth surface, and an explosion-proof valve is provided in the explosion-proof hole. The second reinforcing part is connected to the second cover plate and protrudes towards the battery cell relative to the fourth surface. The second reinforcing part is disposed between the explosion-proof hole and the edge of the second cover plate.

7. The battery cell according to claim 6, characterized in that, The second reinforcing part is a second recessed platform, one side of which is recessed into the third surface, and the other side of which protrudes from the fourth surface.

8. The battery cell according to claim 7, characterized in that, The surface area of ​​the second settling platform is S3, and the surface area of ​​the third surface is S4. S3 and S4 satisfy: S3 / S4≥0.

005.

9. The battery cell according to claim 6, characterized in that, The distance between the outer contour of the explosion-proof hole and the outer edge of the second reinforcing part is greater than or equal to 5mm.

10. The battery cell according to claim 6, characterized in that, The first cover plate or the second cover plate is provided with a pole post hole, and a pole post is provided in the pole post hole.

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