Battery monomer, battery and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell and an electrode assembly, an accommodating cavity is formed in the shell, the accommodating cavity comprises a bottom wall and a side wall, the side wall is connected to the top side of the bottom wall, the bottom wall and the side wall are in fillet connection, and a bulge protruding towards the top side is formed on the bottom wall. The electrode assembly is contained in the containing cavity and located on the side, away from the bottom wall, of the protrusion. According to the battery monomer provided by the embodiment of the invention, the electrode assembly is raised through the bulge, so that the interval is formed between the electrode assembly and the fillet, and the safety of the electrode assembly can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, a battery and an electrical device. Background Art

[0002] In the related art, a battery cell includes a housing and an electrode assembly. The housing forms a receiving cavity, and the side wall and the bottom wall of the receiving cavity are connected by a rounded corner. The electrode assembly is accommodated in the receiving cavity, and the electrode assembly is likely to collide with the rounded corner, resulting in damage to the electrode assembly and triggering a safety risk. Summary of the Utility Model

[0003] In view of this, embodiments of the present application are expected to provide a battery cell, a battery and an electrical device, which can improve the safety of the electrode assembly.

[0004] A first aspect of an embodiment of the present application provides a battery cell, including:

[0005] A housing that forms a receiving cavity. The receiving cavity includes a bottom wall and a side wall. The side wall is connected to the top side of the bottom wall. The bottom wall and the side wall are connected by a rounded corner. The bottom wall forms a protrusion protruding towards the top side;

[0006] An electrode assembly accommodated in the receiving cavity. The electrode assembly is located on a side of the protrusion away from the bottom wall.

[0007] For the battery cell provided by the embodiment of the present application, the protrusion has a positioning function and a limiting function on the electrode assembly. By raising the electrode assembly through the protrusion, a gap is maintained between the electrode tab of the electrode assembly and the rounded corner, which can prevent the electrode assembly from colliding with the rounded corner, resulting in damage to the electrode assembly or shedding of the active material, thereby improving the safety performance and service life of the battery cell. In addition, by providing the protrusion, the bottom support plate can be cancelled, the manufacturing process of the battery cell can be simplified, the material cost can be reduced, and the production efficiency can be improved.

[0008] In some embodiments, the electrode assembly includes electrode tabs and a separator. The separator is disposed between the two electrode tabs and protrudes from the bottom surface of the electrode tabs. The bottom surface of the electrode tabs is higher than the vertex of the rounded corner.

[0009] In this embodiment, a gap is formed between the electrode tabs and the rounded corner through the separator, which can effectively enhance the safety of the electrode tabs.

[0010] In some embodiments, the protrusion includes a first protrusion, and the first protrusion has a wavy structure.

[0011] In this embodiment, the wavy structure increases the surface area of the bottom wall, thereby increasing the bonding area between the bottom wall and the electrode assembly and the heat dissipation area of the battery cell. At the same time, the first protrusion increases the roughness of the bottom wall to enhance the limiting effect of the bottom wall on the electrode assembly. In addition, by setting an appropriate wavelength, it is beneficial to the transmission of stress on the outer shell and prevent local stress concentration on the first protrusion.

[0012] In some embodiments, the wavy structure extends continuously in the first direction, where the first direction is perpendicular to the top-bottom direction.

[0013] In this embodiment, the supporting area of the first protrusion on the electrode assembly can be increased, enhancing the stability of the electrode assembly.

[0014] In some embodiments, at least two of the wavy structures are arranged at intervals in the first direction.

[0015] In this embodiment, on the basis of effectively protecting the safety of the electrode assembly, the proportion area of the first protrusions on the bottom wall can be reduced, facilitating processing and improving production efficiency.

[0016] In some embodiments, the protrusion includes a second protrusion. Taking the plane perpendicular to the top-bottom direction as the projection plane, the projection of the second protrusion has a nested ring structure or a spiral structure arranged layer by layer.

[0017] In this embodiment, it is possible to prevent some of the pole piece assemblies from getting stuck in the grooves formed by the second protrusions, improving the stability of the electrode assembly.

[0018] In some embodiments, the protrusion includes a third protrusion, and the third protrusion has a long strip structure extending along a straight line.

[0019] In this embodiment, compared with the corrugated structure, the long strip structure can provide a relatively large supporting area for the electrode assembly, improving the stability of the electrode assembly.

[0020] In some embodiments, the third protrusion extends in the second direction, and at least two of the long strip structures are arranged at intervals in the first direction, where the first direction, the second direction, and the top-bottom direction are perpendicular to each other.

[0021] In this embodiment, by setting appropriate spacing and quantity, that is, adjusting the distribution density of the third protrusions, the structural stability of the outer shell is enhanced.

[0022] In some embodiments, the protrusion includes a fourth protrusion. Taking the plane perpendicular to the top-bottom direction as the projection plane, the maximum dimension of the projection shape of the fourth protrusion is smaller than the maximum dimension of the projection shape of the third protrusion, and the fourth protrusions are distributed on both sides of the third protrusion along the length direction.

[0023] In this embodiment, on the basis of effectively protecting the safety of the electrode assembly, the proportion area of the protrusions on the bottom wall can be reduced, which is convenient for processing and improves production efficiency.

[0024] In some embodiments, the bottom wall is formed with reinforcing ribs, and the height of the reinforcing ribs is lower than the height of the protrusions.

[0025] In this embodiment, it is prevented that the reinforcing ribs are higher than the third protrusion to form local sharp protrusions, enhancing the safety of the electrode assembly.

[0026] In some embodiments, with a plane perpendicular to the top-bottom direction as the projection plane, the ratio of the total projection area of the protrusions to the projection area of the bottom wall is 0.2 to 0.8.

[0027] In this embodiment, by setting an appropriate ratio, the support reliability of the protrusions for the electrode assembly can be improved.

[0028] In some embodiments, the receiving cavity includes a top wall, the top wall is located on the top side of the bottom wall and is connected to the side wall, at least one of the top wall and the side wall has a sticking position, the sticking position is bonded to the electrode assembly, and the sticking position is formed with a protruding portion.

[0029] In this embodiment, the protruding portion increases the roughness of the outer shell to improve the limiting effect of the outer shell on the electrode assembly and the sticking effect between the outer shell and the electrode assembly.

[0030] In the second aspect of the embodiments of the present application, a battery is provided, including the battery cell as described above.

[0031] In the third aspect of the embodiments of the present application, an electrical device is provided, including the battery for providing electric energy as described above. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a battery cell provided by some embodiments of the present application;

[0033] Figure 2 For the present application Figure 1 The enlarged view at A;

[0034] Figure 3 It is a schematic structural diagram of an electrode assembly provided by some embodiments of the present application abutting on the protrusions;

[0035] Figure 4 For the present application Figure 1 The sectional schematic diagram at the position of a-a;

[0036] Figure 5 It is a schematic structural diagram of a battery cell provided by other some embodiments of the present application;

[0037] Figure 6Schematic diagram of the battery cell provided in some other embodiments of the present application;

[0038] Figure 7 Schematic diagram of the battery cell provided in some other embodiments of the present application;

[0039] Figure 8 Schematic diagram of the battery cell provided in some other embodiments of the present application;

[0040] Figure 9 For the present application Figure 8 Cross-sectional view at the b-b position;

[0041] Figure 10 Cross-sectional view of the battery cell provided in some other embodiments of the present application at the bottom wall position.

[0042] Description of reference numerals

[0043] Battery cell 100; housing 10; receiving cavity 10a; protruding portion 10b; bottom wall 11; protrusion 11a; first protrusion 11a1; second protrusion 11a2; third protrusion 11a3; fourth protrusion 11a4; side wall 12; rounded corner 13; top wall 14; electrode assembly 20; electrode sheet 21; anode electrode sheet 211; cathode electrode sheet 212; separator 22; insulating film 23; reinforcing rib 30. Detailed description of the specific embodiments

[0044] The following further describes the embodiments of the present application in detail with reference to the drawings and embodiments. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0045] In the various specific technical features and embodiments described in the detailed description, without conflict, they can be combined in any suitable manner. For example, different combinations of specific technical features / embodiments can form different embodiments. To avoid unnecessary repetition, various possible combination methods of the specific technical features / embodiments in the present application will not be described separately.

[0046] It should be noted that the top is the direction opposite to the bottom, the first direction, the second direction, and the top-bottom direction are perpendicular to each other, and together they form a three-dimensional perpendicular coordinate system. Exemplarily, in some embodiments of the present application, the bottom can be the direction towards the ground, one of the first direction and the second direction can be the front-back direction, and the other of the first direction and the second direction can be the left-right direction. The front refers to the direction towards the user, and the back is the direction opposite to the front; the left refers to the side where the left hand is located when the user is in front of the battery cell 100, and the right is the direction opposite to the left.

[0047] In the related art, a battery cell includes a bottom support plate disposed between the electrode assembly and the bottom wall to raise the electrode assembly and prevent damage caused by the electrode assembly colliding with the rounded corner. However, the bottom support plate increases the number of components of the battery cell, resulting in an increase in the manufacturing cost of the battery cell.

[0048] An embodiment of the present application provides a battery cell 100, including a housing 10 and an electrode assembly 20. Please refer to Figures 1 to 10 , the housing 10 forms a receiving cavity 10a. The receiving cavity 10a includes a bottom wall 11 and a side wall 12. The side wall 12 is connected to the top side of the bottom wall 11. The bottom wall 11 and the side wall 12 are connected by a rounded corner 13. The bottom wall 11 forms a protrusion 11a protruding toward the top side; the electrode assembly 20 (not shown in the figure) is accommodated in the receiving cavity 10a, and the electrode assembly 20 is located on the side of the protrusion 11a away from the bottom wall 11.

[0049] In the battery cell 100 provided by the embodiment of the present application, the protrusion 11a has a positioning and limiting effect on the electrode assembly 20. By raising the electrode assembly 20 through the protrusion 11a, a gap is maintained between the electrode assembly 20 and the rounded corner 13, which can prevent the electrode assembly 20 from colliding with the rounded corner 13, resulting in damage to the electrode assembly 20 or shedding of the active material, thereby improving the safety performance and service life of the battery cell 100. In addition, by providing the protrusion 11a, the bottom support plate can be cancelled, simplifying the manufacturing process of the battery cell 100, reducing the material cost, and improving the production efficiency.

[0050] The forming process of the protrusion 11a includes but is not limited to stamping. The material of the housing 10 can be a metal material to enhance the structural strength of the battery cell 100. Exemplarily, for example, it can be aluminum or steel, etc.

[0051] The battery cell 100 can be a secondary battery cell. A secondary battery cell refers to a battery cell 100 that can be activated by charging after discharging to continue use.

[0052] Exemplarily, the battery cell 100 includes but is not limited to a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, or a magnesium-ion battery cell, etc.

[0053] In some embodiments, please refer to Figure 3 , the electrode assembly 20 includes a pole piece 21 and a separator 22. The separator 22 is disposed between two pole pieces 21 and protrudes from the bottom surface of the pole piece 21. The bottom surface of the pole piece 21 is higher than the vertex of the rounded corner 13. In this way, a gap is formed between the pole piece 21 and the rounded corner 13 through the separator 22, which can effectively enhance the safety of the pole piece 21.

[0054] The vertex of the rounded corner 13 is the part with the largest distance between the rounded corner 13 and the bottom wall 11.

[0055] The electrode tab 21 serves as a channel for electron and ion transport. During the charge and discharge process of the battery cell 100, active ions (such as lithium ions) migrate back and forth between the two electrode tabs 21. The separator 22 can prevent short circuits and allow active ions to pass through.

[0056] In some embodiments, referring to Figure 3 , the battery cell 100 includes an insulating film 23 that at least covers the bottom surface of the electrode assembly 20. In this way, the insulating film 23 serves to insulate, can also protect the bottom surface of the electrode assembly 20 from being scratched, and further increases the spacing between the electrode tab 21 and the rounded corner 13, enhancing the safety of the electrode tab 21. Exemplarily, the insulating film 23 covers the outer surface of the electrode assembly 20 to improve the insulation performance of the electrode assembly 20. The insulating film 23 can abut against the protrusion 11a to provide a good protection effect.

[0057] In some embodiments, referring to Figure 3 , the electrode tab 21 includes an anode tab 211 and a cathode tab 212. The insulating film 23 covers the bottom surface of the anode tab 211. In the top-bottom direction, the bottom surface of the cathode tab 212 is higher than the bottom surface of the anode tab 211. That is to say, the bottom surface of the anode tab 211 is closer to the vertex of the rounded corner 13 relative to the bottom surface of the cathode tab 212. In this way, by maintaining the spacing between the anode tab 211 and the rounded corner 13, it is possible to protect against collision between the entire electrode tab 21 and the housing.

[0058] In some embodiments, referring to Figure 1 and Figure 2 , the protrusion 11a includes a first protrusion 11a1, and the first protrusion 11a1 has a wavy structure.

[0059] Exemplarily, referring to Figure 2 , with a plane perpendicular to the second direction as the projection plane, the projected shape of the first protrusion 11a1 is wavy. In this way, on the one hand, the wavy structure increases the surface area of the bottom wall 11, thereby increasing the adhesion area between the bottom wall 11 and the electrode assembly 20 and the heat dissipation area of the battery cell 100. On the other hand, the first protrusion 11a1 increases the roughness of the bottom wall 11 to enhance the limiting effect of the bottom wall 11 on the electrode assembly 20 and prevent the electrode assembly 20 from shaking and shifting in the receiving cavity 10a. On the further hand, by setting an appropriate wavelength, it is beneficial for stress to be transmitted on the outer shell 10 and prevent local stress concentration at the first protrusion 11a1.

[0060] Figure 2 In, the wavelength refers to the distance between two adjacent wave crests of the first protrusion 11a1, and D1 represents the wavelength of the first protrusion 11a1.

[0061] Exemplarily, refer to Figure 4 , the first protrusion 11a1 extends in the front - rear direction to connect with the side wall 12 and is perpendicular to the side wall 12. Thus, it is beneficial to the structural stability of the housing 10.

[0062] In some embodiments, taking the plane perpendicular to the second direction as the projection plane, the projected shape of the first protrusion 11a1 is any one of a V - shape, a quadrilateral, or a semi - circular shape, or any combination of at least two of the foregoing shapes. Exemplarily, for example, it can be semi - circular. Thus, the radian on the top side of the first protrusion 11a1 is small and the contact surface with the electrode assembly 20 is smooth, which can prevent the local sharp wear or even piercing of the insulating film 23 by the first protrusion 11a1 and improve the safety of the electrode assembly 20.

[0063] In one embodiment, refer to Figure 5 , the outer bottom surface of the housing 10 is planar, so that the battery cell 100 can be stably placed on the placement surface. At the same time, it is convenient for the assembly between at least two battery cells 100.

[0064] In some embodiments, refer to Figure 6 , the wavy structure continuously extends in the first direction, where the first direction is perpendicular to the top - bottom direction. That is to say, the ripple propagation direction of the wavy structure is the first direction. Thus, it can increase the supporting area of the first protrusion 11a1 for the electrode assembly 20 and enhance the stability of the electrode assembly 20.

[0065] In some other embodiments, refer to Figure 1 , at least two wavy structures are arranged at intervals in the first direction. Thus, on the basis of effectively protecting the safety of the electrode assembly 20, it can reduce the occupied area ratio of the first protrusions 11a1 on the bottom wall 11, facilitate processing, and improve production efficiency.

[0066] Exemplarily, refer to Figure 4 , there are three first protrusions 11a1 arranged at intervals in the left - right direction. One of the first protrusions 11a1 is arranged in the middle of the bottom wall 11, and the other two first protrusions 11a1 are symmetrically distributed on the opposite sides of the middle first protrusion 11a1. Thus, it can prevent the electrode assembly 20 from tilting and shifting due to uneven distribution of the first protrusions 11a1 and improve the stability of the electrode assembly 20. In this embodiment, the first direction can be the left - right direction.

[0067] In some embodiments, refer to Figure 7, the protrusion 11a includes a second protrusion 11a2. Taking the plane perpendicular to the top-bottom direction as the projection plane, the projection of the second protrusion 11a2 is in the form of a nested ring structure or a spiral structure arranged layer by layer. In this way, it is possible to prevent some of the pole piece components from getting stuck in the grooves formed by the second protrusion 11a2, and improve the stability of the electrode assembly 20.

[0068] Exemplarily, please continue to refer to Figure 7 , there are two second protrusions 11a2, and the two second protrusions 11a2 are arranged at intervals in the left-right direction and symmetrically distributed, which can prevent the uneven distribution of the second protrusions 11a2 from causing the electrode assembly 20 to tilt and shift, and further improve the stability of the electrode assembly 20.

[0069] In some embodiments, please refer to Figure 8 and Figure 9 , the protrusion 11a includes a third protrusion 11a3, and the third protrusion 11a3 is in a long strip structure extending along a straight line. Exemplarily, when the total projection areas of the first protrusion 11a1 and the third protrusion 11a3 are equal with the plane perpendicular to the top-bottom direction as the projection plane, the long strip structure can provide a larger support area for the electrode assembly 20 compared with the corrugated structure, and improve the stability of the electrode assembly 20.

[0070] In some embodiments, the third protrusion 11a3 extends along a second direction, and at least two long strip structures are arranged at intervals along a first direction, wherein the first direction, the second direction and the top-bottom direction are perpendicular to each other.

[0071] Exemplarily, please refer to Figure 9 , the third protrusion 11a3 extends along the front-rear direction to connect with the side wall 12 and is perpendicular to the side wall 12. Further, by setting appropriate spacing and quantity, that is, adjusting the distribution density of the third protrusion 11a3, the structural stability of the housing 10 is enhanced. In this embodiment, the second direction can be the front-rear direction.

[0072] Figure 9 In

[0073] In some embodiments, please refer to Figure 10 , the protrusion 11a includes a fourth protrusion 11a4. Taking the plane perpendicular to the top-bottom direction as the projection plane, the maximum dimension of the projection shape of the fourth protrusion 11a4 is smaller than the maximum dimension of the projection shape of the third protrusion 11a3, and the fourth protrusion 11a4 is distributed on both sides of the third protrusion 11a3 along the length direction. In this way, on the basis of effectively protecting the safety of the electrode assembly 20, the occupied area of the protrusions 11a on the bottom wall 11 can be reduced, which is convenient for processing and improves production efficiency.

[0074] Exemplarily, please continue to refer to Figure 10, the projected shape of the fourth protrusion 11a4 can be circular. By setting appropriate spacing and quantity, that is, adjusting the distribution density of the fourth protrusions 11a4, the structural stability of the housing 10 can be enhanced.

[0075] It should be noted that the maximum dimension of the projected shape of the fourth protrusion 11a4 refers to the dimension between the two points with the farthest distance in the projected shape of the fourth protrusion 11a4. Taking the projected shape of the fourth protrusion 11a4 as a circle as an example, the maximum dimension of the projected shape of the fourth protrusion 11a4 refers to the diameter of the circle.

[0076] The maximum dimension of the projected shape of the third protrusion 11a3 refers to the dimension between the two points with the farthest distance in the projected shape of the third protrusion 11a3. Taking the projected shape of the third protrusion 11a3 as a rectangle as an example, the maximum dimension of the projected shape of the third protrusion 11a3 refers to the diagonal length of the rectangle.

[0077] Figure 10 where D3 represents the spacing between the center points of two adjacent fourth protrusions 11a4.

[0078] In some embodiments, please refer to Figure 8 , the bottom wall 11 is formed with a reinforcing rib 30, and the height of the reinforcing rib 30 is lower than the height of the protrusion 11a. The reinforcing rib 30 is used to improve the structural strength of the housing 10.

[0079] Exemplarily, please refer to Figure 8 and Figure 9 , at least two third protrusions 11a3 are arranged at intervals in the left-right direction, and the reinforcing rib 30 is arranged between two adjacent third protrusions 11a3. In this way, it can be prevented that the reinforcing rib 30 protrudes higher than the third protrusion 11a3 to form a local sharp protrusion, and the safety of the electrode assembly 20 is enhanced.

[0080] In some embodiments, taking the plane perpendicular to the top-bottom direction as the projection plane, the ratio of the total projected area of the protrusions 11a to the projected area of the bottom wall 11 is 0.2 to 0.8. Exemplarily, for example, it can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 or 0.8, etc. In this way, by setting an appropriate ratio, the support reliability of the protrusions 11a for the electrode assembly 20 can be improved.

[0081] In some embodiments, please refer to Figure 1 , the receiving cavity 10a includes a top wall 14, the top wall 14 is located on the top side of the bottom wall 11 and is connected to the side wall 12, and at least one of the top wall 14 and the side wall 12 has an adhesive position, the adhesive position is bonded to the electrode assembly 20, and a protrusion 10b is formed on the adhesive position. In this way, the protrusion 10b (not shown in the figure) increases the roughness of the housing 10 to improve the limiting effect of the housing 10 on the electrode assembly 20 and the bonding effect between the housing 10 and the electrode assembly 20.

[0082] Exemplarily, in some embodiments, the outer casing 10 includes a housing and a top cover. The housing is formed with a cavity that opens towards the top side, and the top cover closes the top-side opening of the cavity to jointly form a receiving cavity 10a. The bottom wall and the side walls of the cavity are the bottom wall 11 and the side walls 12 of the receiving cavity 10a. The top wall 14 of the receiving cavity 10a is the wall surface of the top cover facing the cavity.

[0083] In some embodiments, the top of the electrode assembly 20 is configured with a tab, and the top cover is configured with a terminal post. The tab is electrically connected to the terminal post. Through the tab and the terminal post, the electrode assembly 20 can be electrically connected to an external circuit.

[0084] In some embodiments, the receiving cavity 10a is further filled with an electrolyte. The active ions in the electrolyte can pass through the separator membrane 22 and migrate between the anode electrode sheet 211 and the cathode electrode sheet 212 to achieve charge and discharge.

[0085] The second aspect of the embodiments of the present application provides a battery, including the battery cell 100 in any one of the embodiments of the present application.

[0086] The battery includes at least one battery cell 100. The battery can be formed by arranging at least two grouped battery cells 100 in a sealed box. In this way, it is beneficial to the safety and stability of the battery and has a more reliable waterproof and dustproof performance. Therefore, it can be applied to harsh, humid, or even water-immersed usage scenarios.

[0087] Exemplarily, at least two battery cells 100 in the battery can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among at least two battery cells 100. At least two battery cells 100 can be directly connected in series, in parallel, or in a hybrid connection together; of course, it can also be that at least two battery cells 100 are first connected in series, in parallel, or in a hybrid connection to form a battery cell module, and then at least two battery cell modules are connected in series, in parallel, or in a hybrid connection to form an integral body.

[0088] The battery can further include other structures. For example, the battery can further include a busbar component for realizing the electrical connection between at least two battery cells 100.

[0089] The third aspect of the embodiments of the present application provides an electrical device, including the battery in any one of the embodiments of the present application for providing electrical energy.

[0090] The electrical devices provided by the embodiments of the present application include but are not limited to energy storage systems, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0091] For the battery cell 100 provided by the embodiments of the present application, please refer to Figures 1 to 10 , the battery cell 100 includes an electrode assembly 20 and a housing 10. The electrode assembly 20 includes an anode plate 211, a cathode plate 212, and a separator 22. The separator 22 is disposed between the adjacent anode plate 211 and cathode plate 212 to jointly form a plate assembly, and at least covers the bottom surface of the anode plate 211. The bottom wall 11 and the side wall 12 are connected by a rounded corner 13. The bottom wall 11 is formed with a protrusion 11a. The electrode assembly 20 abuts on the protrusion 11a. The electrode assembly 20 is lifted by the protrusion 11a, so that a gap is maintained between the electrode assembly 20 and the rounded corner 13. The protrusion 11a also has a positioning and limiting effect on the electrode assembly 20 to prevent the electrode assembly 20 from shaking and shifting. The battery cell 100 further includes an insulating film 23. The insulating film 23 at least covers the bottom surface of the electrode assembly 20. The insulating film 23 can abut on the protrusion 11a. In this way, the distance between the electrode assembly 20 and the rounded corner 13 is increased, which can protect the electrode assembly 20 from colliding with the housing, resulting in damage to the electrode assembly 20 or shedding of the active material, thereby improving the safety performance and service life of the battery cell 100. In addition, by providing the protrusion 11a, the bottom support plate can be cancelled, the manufacturing process of the battery cell 100 can be simplified, the material cost can be reduced, and the production efficiency can be improved. Further, the protrusion 11a can be in a corrugated structure. By setting an appropriate wavelength, the form of stress transmission is optimized, local stress concentration of the protrusion 11a is prevented, and the safety and stability of the battery cell 100 are improved.

[0092] In the description of this specification, the descriptions referring to the terms "some embodiments", "other embodiments" and "exemplarily" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0093] The various embodiments / implementations provided by the present application can be combined with each other without contradiction. The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: The housing is formed with a receiving cavity, the receiving cavity includes a bottom wall and a side wall, the side wall is connected to the top side of the bottom wall, the bottom wall and the side wall are connected with a rounded corner, and the bottom wall is formed with a protrusion protruding toward the top side; The electrode assembly is accommodated in the receiving cavity, and the electrode assembly is located on a side of the protrusion away from the bottom wall.

2. The battery cell according to claim 1, characterized in that: The electrode assembly includes a pole piece and a separation membrane, wherein the separation membrane is arranged between two pole pieces and protrudes from the bottom surface of the pole piece, and the bottom surface of the pole piece is higher than the vertex of the fillet.

3. The battery cell according to claim 1, characterized in that: The protrusions include a first protrusion, and the first protrusion is in a wave-shaped structure.

4. The battery cell according to claim 3, characterized in that: The wavy structure extends continuously along the first direction; or, At least two of the wavy structures are arranged at intervals along a first direction, wherein the first direction is perpendicular to the top and bottom directions.

5. The battery cell according to claim 1, characterized in that: The protrusions include a second protrusion, and the projection of the second protrusion is a ring structure or a spiral structure that is set layer by layer, with the plane perpendicular to the top and bottom directions as the projection surface.

6. The battery cell according to claim 1, characterized in that: The protrusions include a third protrusion, and the third protrusion is in a long strip structure extending along a straight line.

7. The battery cell according to claim 6, characterized in that: The third protrusion extends along the second direction, and at least two of the long strip structures are arranged at intervals along the first direction, wherein the first direction, the second direction and the top and bottom directions are perpendicular to each other.

8. The battery cell according to claim 6, characterized in that: The protrusions include a fourth protrusion, with the plane perpendicular to the top and bottom directions as the projection surface, the maximum dimension of the projection shape of the fourth protrusion is smaller than the maximum dimension of the projection shape of the third protrusion, and the fourth protrusions are distributed on both sides of the third protrusion along the length direction.

9. The battery cell according to claim 1, characterized in that: The bottom wall is formed with a reinforcing rib, and the height of the reinforcing rib is lower than the height of the protrusion.

10. The battery cell according to any one of claims 1 to 9, characterized in that: Taking the plane perpendicular to the top and bottom directions as the projection surface, the ratio of the total projection area of ​​the protrusions to the projection area of ​​the bottom wall is 0.2 to 0.

8.

11. The battery cell according to any one of claims 1 to 9, characterized in that: The receiving cavity includes a top wall, which is located on the top side of the bottom wall and connected to the side wall. At least one of the top wall and the side wall has a sticking position, which is bonded to the electrode assembly and has a protrusion formed on the sticking position.

12. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 11.

13. An electrical device, characterized in that: A battery as claimed in claim 12 for providing electrical energy.

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