Battery monomer, battery device, electric equipment and energy storage equipment

Abstract

The utility model relates to the related technical field of batteries, and discloses a single battery, a battery device, electric equipment and energy storage equipment, the single battery comprises a shell, an end cover, an electrode terminal, an electrode assembly and an insulating part, the shell is provided with a containing cavity, the end cover seals the containing cavity, the electrode terminal is arranged on the end cover, the electrode assembly is arranged in the shell, and the insulating part is arranged in the containing cavity. The electrode assembly comprises a tab and an electrode main body, the tab protrudes from the electrode main body to the end cover, and the tab is electrically connected with the electrode terminal; the insulating part is arranged between the end cover and the electrode assembly, the insulating part comprises a body part and a boss, the boss comprises a first surface facing the electrode main body, the total area of the first surface is larger than or equal to 1 / a times of the weight of the electrode main body, a is larger than or equal to 0.008 and smaller than or equal to 0.026, the unit of the total area is square millimeters, the unit of the weight is N, and the unit of a is megapascals. Therefore, the possibility that the electrode assembly is damaged by pressing of the insulating part is reduced, and the reliability of the single battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, and in particular to a battery monomer, a battery device, a power consumption equipment and an energy storage equipment. BACKGROUND

[0002] The part provided in this part is merely background information of the present application, which is not necessarily prior art.

[0003] The battery monomer includes a shell, an electrode assembly and the like, the shell is usually metal, in order to insulate the conductive components inside the shell from the shell, an insulating piece is usually placed between the electrode assembly and the shell to reduce the risk of short circuit of the battery monomer, but the end surface of the electrode assembly in contact with the insulating piece is prone to crushing problem, which may cause the risk of lap joint of the anode and cathode sheets of the bare battery cell. Therefore, how to reduce the damage of the battery and improve the reliability of the battery monomer has become a problem that cannot be ignored in the development process of battery technology. Content of the utility model

[0004] In view of the above problems, the present application provides a battery monomer, a battery device, a power consumption equipment and an energy storage equipment to at least alleviate the problem of damage of the battery monomer.

[0005] The first aspect of the present application provides a battery monomer, comprising a shell, an electrode assembly and an insulating piece, the shell has a containing cavity, and the end cover closes the containing cavity; an electrode terminal is arranged on the end cover; the electrode assembly is arranged in the shell, the electrode assembly comprises a tab and an electrode body, the tab protrudes from the electrode body to the end cover, and the tab is electrically connected with the electrode terminal; the insulating piece is arranged between the end cover and the electrode body, the insulating piece comprises a body part and a boss, the boss protrudes from the body part towards the electrode body, the boss comprises a first surface towards the electrode body, and the total area of the first surface is greater than or equal to 1 / a times the weight of the electrode body, wherein a is greater than or equal to 0.008 and less than or equal to 0.026, the unit of the total area is square millimeter, the unit of the weight is newton, and the unit of a is megapascal.

[0006] In the technical scheme of the embodiment of the present application, the bosses are protruded towards the electrode assembly relative to the body part, which can improve the strength of the insulating part, and meanwhile, the bosses are designed to be protruded relative to the body part, which can increase the contact area of the insulating part and the insulating film and improve the connection strength and stability. The boss includes a first surface facing the electrode body, and the total area of the first surface is greater than or equal to 1 / a times the weight of the electrode body, where a is greater than or equal to 0.008 and less than or equal to 0.026. When the electrode body is inverted and contacts the first surface during the production and assembly process, the total area of the first surface is related to the weight of the electrode body, which can reduce the pressure when the electrode body contacts the boss, thereby avoiding the boss from causing the electrode body to be pressed and improving the reliability of the battery cell.

[0007] In addition, the battery cell according to the present application can also have the following additional technical features:

[0008] In some embodiments of the present application, when the weight is greater than or equal to 49 Newton and less than or equal to 117.6 Newton, the total area of the first surface is greater than or equal to 2800 square millimeters and less than or equal to 7000 square millimeters.

[0009] In the technical scheme of the embodiment, the weight of the electrode body and the total area of the first surface are limited, which can ensure that the first surface does not damage the electrode body when it contacts the electrode body, and also avoids affecting the installation of the tab due to the total area of the first surface being too large, thereby improving the convenience of tab installation.

[0010] In some embodiments of the present application, the boss is at least one, and each of the bosses includes the first surface, and the first surface of the boss is symmetrically arranged about the length middle line of the body part.

[0011] In the embodiment, the first surface of the boss is symmetrically arranged about the length middle line of the body part, which can ensure that the electrode body is uniformly stressed when it contacts the first surface, and can have good support stability, thereby avoiding the possibility of the first surface causing the electrode body to be pressed.

[0012] In some embodiments of the present application, the boss includes a first boss, a second boss and a third boss, and the first boss, the second boss and the third boss are sequentially and spaced arranged along a first direction, the tab includes a positive tab and a negative tab, the positive tab and the negative tab are respectively arranged between two adjacent bosses, and the first direction is the length direction of the body part.

[0013] In the embodiment, the first boss, the second boss and the third boss are spaced arranged along the length direction of the body part, and the first boss and the second support and the second boss and the third boss form a avoiding space, which can facilitate the arrangement of the tab.

[0014] In some embodiments of the present application, the ratio of the sum of the size of the first protrusion, the size of the second protrusion and the size of the third protrusion to the size of the body portion is greater than or equal to 1 / 5 and less than or equal to 2 / 5 along the first direction.

[0015] In the present embodiment, the size of the first protrusion, the size of the second protrusion and the size of the third protrusion in the first direction are limited so that the first protrusion, the second protrusion and the third protrusion have good support stability, and when the electrode body is inverted and contacts the first protrusion, the second protrusion and the third protrusion, the risk of causing the electrode tab of the electrode body to be deformed, bruised or decarburized is reduced, and meanwhile, the convenience of tab assembly can be maintained.

[0016] In some embodiments of the present application, the ratio of the size of the first protrusion to the size of the body portion is greater than or equal to 3 / 50 and less than or equal to 1 / 6 along the first direction; and / or the ratio of the size of the second protrusion to the size of the body portion is greater than 0 and less than or equal to 7 / 25 along the first direction; and / or the ratio of the size of the third protrusion to the size of the body portion is greater than or equal to 3 / 50 and less than or equal to 1 / 6 along the first direction.

[0017] In the present embodiment, the size of the first protrusion in the first direction is limited, which can improve the support area of the first protrusion for the electrode body on the basis of maintaining the convenience of tab assembly, and reduce the risk of causing the electrode body to be bruised and decarburized when the electrode body is inverted. The size of the second protrusion in the first direction is limited, which can improve the support area of the second protrusion for the electrode body on the basis of maintaining the convenience of tab assembly, and reduce the risk of causing the electrode body to be bruised and decarburized when the large-size electrode assembly is inverted. The size of the third protrusion in the first direction is limited, which can improve the support area of the third protrusion for the electrode body on the basis of maintaining the convenience of tab assembly, and reduce the risk of causing the electrode body to be bruised and decarburized when the electrode body is inverted.

[0018] In some embodiments of the present application, the size of the body portion is greater than or equal to 160 mm and less than or equal to 310 mm along the first direction; and / or the size of the first protrusion, the size of the second protrusion and the size of the third protrusion are all greater than or equal to 16 mm along the first direction, and the sum of the size of the first protrusion, the size of the second protrusion and the size of the third protrusion is less than or equal to 124 mm.

[0019] In the technical scheme of the embodiment, by limiting the size of the first boss, the second boss and the third boss along the first direction, the support area of the first boss, the second boss and the third boss to the electrode assembly is increased on the basis of maintaining the convenience of assembling the tab, and the pressure of the first boss, the second boss and the third boss acting on the electrode body when the electrode assembly is inverted is reduced, thereby reducing the risk of damage to the electrode body caused by the first boss, the second boss and the third boss.

[0020] In some embodiments of the present application, along the second direction, the size of the first boss, the size of the second boss and the size of the third boss are equal to the size of the body part, and the second direction is the width direction of the body part.

[0021] In the embodiment, the size of the first boss, the second boss and the third boss in the second direction is limited, and the two ends of the first boss, the second boss and the third boss along the second direction can be used for adhesive connection of the insulating film, which can increase the contact area of the insulating part and the insulating film and improve the connection strength and stability.

[0022] In some embodiments of the present application, along the second direction, the size of the body part is greater than or equal to 68 mm and less than or equal to 100 mm.

[0023] In the embodiment, the size of the body part is limited, so that the size of the first surface in the second direction is not too narrow, the total area of the first surface is ensured, and damage to the electrode body caused by the boss when the electrode body is inverted is avoided.

[0024] In some embodiments of the present application, along the second direction, the size of the body part is greater than or equal to 70 mm and less than or equal to 75 mm.

[0025] In the embodiment, the size of the body part is limited, so that the size of the first surface in the second direction is not too narrow, and the risk of damage to the electrode body when the electrode body contacts the first surface is reduced.

[0026] In some embodiments of the present application, the first boss includes a first side, a second side, a third side and a fourth side, and is provided with a first rounded corner, a second rounded corner, a third rounded corner and a fourth rounded corner, along the first direction, the first side and the third side are located at the two ends of the first boss, the first rounded corner is formed between the first side and the first surface, the second rounded corner is formed between the second side and the first surface, the third rounded corner is formed between the third side and the first surface, and the fourth rounded corner is formed between the fourth side and the first surface; and the second direction is the width direction of the body part.

[0027] The first convex platform is provided with the first chamfer, the second chamfer, the third chamfer and the fourth chamfer in the embodiment, so that the periphery of the first surface is smoothly transitioned, a better transition buffer is achieved, and the risk of the electrode body being pressed, being injured, being decarburized and being powder is reduced.

[0028] In some embodiments of the present application, the first convex platform is further provided with a fifth chamfer, a sixth chamfer, a seventh chamfer and an eighth chamfer; the fifth chamfer is formed between the first side surface and the second side surface; the sixth chamfer is formed between the second side surface and the third side surface; the seventh chamfer is formed between the third side surface and the fourth side surface; and the eighth chamfer is formed between the first side surface and the fourth side surface.

[0029] In the embodiment, the fifth chamfer, the sixth chamfer, the seventh chamfer and the eighth chamfer are arranged on the first convex platform, so that the first convex platform is prevented from being clamped to the shell during assembly, and the assembly efficiency and quality of the battery monomer are improved.

[0030] In some embodiments of the present application, the curvature radius of the first chamfer is greater than or equal to 1 mm and less than or equal to 1 / 3 times the size of the first convex platform in the first direction; and / or the curvature radius of the third chamfer is greater than or equal to 1 mm and less than or equal to 1 / 3 times the size of the first convex platform in the first direction; the second side surface and the fourth side surface are located at two ends of the first convex platform; the first chamfer is formed between the first side surface and the first surface; and the second side surface and the first surface form the size in the first direction.

[0031] In the embodiment, the curvature radius of the first chamfer and the third chamfer is limited, so that the shear effect of the electrode body caused by the large difference between the two ends of the first convex platform and the electrode body in the first direction is avoided, the electrode body is protected, the area of the first surface of the first convex platform is ensured, and the risk of the electrode body being pressed, being injured, being decarburized and the like caused by the first convex platform is reduced.

[0032] In some embodiments of the present application, the curvature radius of the second chamfer is greater than or equal to 1 mm and less than or equal to 3 mm; and / or the curvature radius of the fourth chamfer is greater than or equal to 1 mm and less than or equal to 3 mm.

[0033] In the embodiment, the radius of curvature of the second and fourth chamfers can avoid the shear effect of the electrode body caused by the too large interface gap when the two ends of the first protrusion in the second direction contact the electrode body, thereby protecting the electrode body, and can increase the area of the first surface of the first protrusion and reduce the risk of deformation, bruising, decarburization, and the like of the electrode body caused by the contact between the first protrusion and the electrode body.

[0034] In some embodiments of the present application, the radius of curvature of the fifth chamfer is greater than or equal to 4 mm and less than or equal to 8 mm, and / or the radius of curvature of the eighth chamfer is greater than or equal to 4 mm and less than or equal to 8 mm.

[0035] In the embodiment, the radius of curvature of the fifth and eighth chamfers can avoid the engagement of the first protrusion and the shell during assembly, and can ensure the areas of the first, second, and fourth side surfaces and reduce the risk of damage to the electrode body caused by the first, second, and fourth side surfaces.

[0036] In some embodiments of the present application, the sixth and seventh chamfers are both circular arc chamfers, the radius of curvature of the sixth chamfer is greater than or equal to 1 mm and less than or equal to 4 mm, and / or the radius of curvature of the seventh chamfer is greater than or equal to 1 mm and less than or equal to 4 mm.

[0037] In the embodiment, the radius of curvature of the sixth and seventh chamfers can significantly distinguish the first protrusion from the round corners of the mold, smoothly transition, reduce the shear effect, facilitate the demolding of the first protrusion, and on the other hand, can avoid the damage to the electrode body caused by the too small edges of the second, third, and fourth side surfaces.

[0038] In some embodiments of the present application, the second protrusion includes a fifth side surface, a sixth side surface, a seventh side surface, and an eighth side surface, and is provided with a ninth chamfer, a tenth chamfer, an eleventh chamfer, and a twelfth chamfer. In the first direction, the fifth and seventh side surfaces are located at the two ends of the first protrusion, and in the second direction, the sixth and eighth side surfaces are located at the two ends of the second protrusion. The ninth chamfer is formed between the fifth side surface and the first surface, the tenth chamfer is formed between the sixth side surface and the first surface, the eleventh chamfer is formed between the seventh side surface and the first surface, and the twelfth chamfer is formed between the eighth side surface and the first surface. The second direction is the width direction of the body portion.

[0039] The ninth chamfer, the tenth chamfer, the eleventh chamfer and the twelfth chamfer are arranged on the second boss in the embodiment, so that the periphery of the first surface on the second boss is smoothly transitioned, a better transition buffer is achieved, the difference between the junctions is reduced when the first surface of the second boss abuts against the electrode body, the electrode body is prevented from being pressed and decarburized and powder is prevented from falling off, and the safety of the electrode assembly is ensured.

[0040] In some embodiments of the present application, the second boss is further provided with a thirteenth chamfer, a fourteenth chamfer, a fifteenth chamfer and a sixteenth chamfer; the thirteenth chamfer is formed between the fifth side surface and the sixth side surface; the fourteenth chamfer is formed between the sixth side surface and the seventh side surface; the fifteenth chamfer is formed between the seventh side surface and the eighth side surface; and the sixteenth chamfer is formed between the fifth side surface and the eighth side surface. In the embodiment, the thirteenth chamfer, the fourteenth chamfer, the fifteenth chamfer and the sixteenth chamfer are arranged on the second boss, so that the second boss is prevented from being clamped to the shell during assembly, and the assembly efficiency and quality of the battery monomer are improved.

[0041] In some embodiments of the present application, the ninth chamfer and the eleventh chamfer are circular arc chamfers; the curvature radius of the ninth chamfer is greater than or equal to 1 mm and less than or equal to 1 / 2 times the difference between the size of the first boss and the size of the sixth side surface in the first direction; and / or the curvature radius of the eleventh chamfer is greater than or equal to 1 mm and less than or equal to 1 / 2 times the difference between the size of the first boss and the size of the sixth side surface in the first direction.

[0042] In the embodiment, the curvature radius of the ninth chamfer and the eleventh chamfer is limited, so that the periphery of the first surface on the second boss is smoothly transitioned in the first direction, a better transition buffer is achieved, the shear effect of the electrode body is prevented when the two ends of the second boss contact the electrode body in the first direction, the electrode body is protected, the area of the first surface of the second boss can be ensured, and the risk of the electrode body being pressed, pressed and decarburized is reduced.

[0043] In some embodiments of the present application, the tenth chamfer and the twelfth chamfer are circular arc chamfers; the curvature radius of the tenth chamfer is greater than or equal to 1 mm and less than or equal to 3 mm; and / or the curvature radius of the twelfth chamfer is greater than or equal to 1 mm and less than or equal to 3 mm.

[0044] In the embodiment, the curvature radius of the tenth and twelfth chamfers is limited, so that the periphery of the first surface on the second boss is smoothly transitioned in the second direction, and better transition buffering is achieved, so that the shear effect of the electrode body caused by the large difference at the junction when the two ends of the second boss contact the electrode body is avoided, the electrode body is protected, and the area of the first surface of the second boss is ensured, and the risk of the electrode body being deformed, bruised, decarburized and the like caused by the second boss is reduced.

[0045] In some embodiments of the present application, the thirteenth chamfer, the fourteenth chamfer, the fifteenth chamfer and the sixteenth chamfer are all arc-shaped chamfers; the curvature radius of the thirteenth chamfer is greater than or equal to 1 mm and less than or equal to 8 mm; and / or the curvature radius of the fourteenth chamfer is greater than or equal to 1 mm and less than or equal to 8 mm; and / or the curvature radius of the fifteenth chamfer is greater than or equal to 1 mm and less than or equal to 8 mm; and / or the curvature radius of the sixteenth chamfer is greater than or equal to 1 mm and less than or equal to 8 mm.

[0046] In the embodiment, the curvature radius of the thirteenth chamfer, the fourteenth chamfer, the fifteenth chamfer and the sixteenth chamfer is limited, so that the second boss is significantly distinguished from the round corners of the mold, the transition is smooth, the shear effect is reduced, the demolding of the second boss is facilitated, and on the other hand, while ensuring the contact area of the second boss, the sharp edges of the side of the second boss are avoided to cause damage to the electrode assembly.

[0047] In some embodiments of the present application, the end cover is further provided with a pressure relief mechanism, the second boss is provided with a receiving groove facing the pressure relief mechanism, the receiving groove includes a first inner side and a second inner side, the second inner side and the second inner side are oppositely arranged in the first direction; the included angle between the first inner side and the body part is greater than 0 and less than or equal to 90 degrees; and / or the included angle between the second inner side and the body part is greater than 0 and less than or equal to 90 degrees.

[0048] In the embodiment, the receiving groove is provided to facilitate the flow of gas or electrolyte to the pressure relief mechanism, and when the battery monomer is in thermal runaway, the exhaust inside the battery monomer can flow to the pressure relief structure through the receiving groove, and the included angle between the first inner side and / or the second inner side and the body part can make the second boss structure more stable and improve the strength of the second boss.

[0049] In some embodiments of the present application, the third protrusion comprises a ninth side, a tenth side, an eleventh side and a twelfth side, and is provided with a seventeenth fillet, an eighteenth fillet, a nineteenth fillet and a twentieth fillet; the ninth side and the eleventh side are located at two ends of the third protrusion in the first direction, and the tenth side and the twelfth side are located at two ends of the third protrusion in a second direction; the seventeenth fillet is formed between the ninth side and the first surface, the eighteenth fillet is formed between the tenth side and the first surface, the nineteenth fillet is formed between the eleventh side and the first surface, and the twentieth fillet is formed between the twelfth side and the first surface; the second direction is the width direction of the body part.

[0050] In the present embodiment, the seventeenth fillet, the eighteenth fillet, the nineteenth fillet and the twentieth fillet are arranged on the third protrusion, so that the periphery of the first surface on the third protrusion is smoothly transitioned, and better transition buffering is achieved, thereby reducing the risk of the electrode body being sheared, crushed, decarburized and powdered due to the large difference at the junction when the first surface of the third protrusion abuts against the electrode body.

[0051] In some embodiments of the present application, the third protrusion is further provided with a twenty-first fillet, a twenty-second fillet, a twenty-third fillet and a twenty-fourth fillet; the twenty-first fillet is formed between the ninth side and the tenth side; the twenty-second fillet is formed between the tenth side and the eleventh side; the twenty-third fillet is formed between the eleventh side and the twelfth side; and the twenty-fourth fillet is formed between the ninth side and the twelfth side.

[0052] In the present embodiment, the twenty-first fillet, the twenty-second fillet, the twenty-third fillet and the twenty-fourth fillet are arranged on the third protrusion, so that the third protrusion is prevented from being clamped to the shell during assembly, and the assembly efficiency and quality of the battery monomer are improved.

[0053] In some embodiments of the present application, the seventeenth fillet and the nineteenth fillet are circular arc fillets; the curvature radius of the seventeenth fillet is greater than or equal to 1 mm and less than or equal to 1 / 3 times the size of the first protrusion in the first direction; and / or the curvature radius of the nineteenth fillet is greater than or equal to 1 mm and less than or equal to 1 / 3 times the size of the first protrusion in the first direction.

[0054] In the embodiment, the radius of curvature of the seventeenth and nineteenth chamfers can avoid the shear effect of the electrode body caused by the too large interface gap when the two ends of the third boss in the first direction contact the electrode body, thereby protecting the electrode body. Meanwhile, the area of the first surface of the third boss can be ensured, thereby reducing the risk of the electrode body being deformed, bruised, decarburized, and the like caused by the third boss.

[0055] In some embodiments of the present application, the eighteenth chamfer and the twentieth chamfer are circular arc chamfers; the radius of curvature of the eighteenth chamfer is greater than or equal to 1 mm and less than or equal to 3 mm; and / or the radius of curvature of the twentieth chamfer is greater than or equal to 1 mm and less than or equal to 3 mm.

[0056] In the embodiment, the radius of curvature of the eighteenth and twentieth chamfers can avoid the shear effect of the electrode body caused by the too large interface gap when the two ends of the third boss in the second direction contact the electrode body, thereby protecting the electrode body. Meanwhile, the area of the first surface of the third boss can be increased, thereby reducing the risk of the electrode body being deformed, bruised, decarburized, and the like caused by the third boss when the third boss contacts the electrode body.

[0057] In some embodiments of the present application, the twenty-first chamfer and the twenty-fourth chamfer are circular arc chamfers; the radius of curvature of the twenty-first chamfer is greater than or equal to 4 mm and less than or equal to 8 mm; and / or the radius of curvature of the twenty-fourth chamfer is greater than or equal to 4 mm and less than or equal to 8 mm.

[0058] In the embodiment, the radius of curvature of the twenty-first and twenty-fourth chamfers can avoid the third boss being stuck to the shell during assembly. Meanwhile, the areas of the ninth, tenth, and twelfth side surfaces can be ensured, thereby reducing the risk of the ninth, tenth, and twelfth side surfaces damaging the electrode body.

[0059] In some embodiments of the present application, the twenty-second chamfer and the twenty-third chamfer are circular arc chamfers; the radius of curvature of the twenty-second chamfer is greater than or equal to 1 mm and less than or equal to 4 mm; and / or the radius of curvature of the twenty-third chamfer is greater than or equal to 1 mm and less than or equal to 4 mm.

[0060] In the embodiment, the radii of the twenty-second and twenty-third fillets of the third boss are limited, so that the third boss is significantly distinguished from the fillets of the mold, a smooth transition is achieved, the shearing effect is reduced, the demolding of the third boss is facilitated, and on the other hand, the contact area of the third boss is ensured while avoiding the edges of the tenth, eleventh and twelfth sides being too small to become sharp edges and causing damage to the electrode body.

[0061] In some embodiments of the present application, the battery monomer further comprises an insulating film provided with an opening, the electrode assembly is arranged in the insulating film, the boss comprises a plurality of side surfaces connected between the body part and the first surface, and at least one of the plurality of side surfaces is connected to the insulating film.

[0062] In the embodiment, the boss is connected to the insulating film through the side surface, so that the setting of the edge side rib of the insulating part can be cancelled, the connection strength of the insulating part and the insulating film is ensured, the first surface is prevented from being pressed by the insertion of the side rib into the electrode body, and the risk of decarburization and powder falling of the pole piece of the electrode body is reduced.

[0063] In some embodiments of the present application, in the first direction, the size of the one with the largest size among the positive electrode tab and the negative electrode tab is greater than or equal to 50 mm and less than or equal to 70 mm, and the distance between the center of the positive electrode tab and the center of the negative electrode tab is greater than or equal to 82 mm and less than or equal to 220 mm.

[0064] In the embodiment, the size of the positive electrode tab and the negative electrode tab in the first direction is limited, so that the area of the first surface is increased on the basis of maintaining the convenience of assembling the electrode tab, and the possibility of damage to the electrode body caused by the boss when the electrode body is inverted is reduced.

[0065] In some embodiments of the present application, the rated capacity of the battery monomer is greater than 400 Ah.

[0066] In the embodiment, the rated capacity of the battery monomer is limited, so that the endurance of the battery monomer is improved.

[0067] In some embodiments of the present application, the size of the shell in the first direction is greater than or equal to 80 mm and less than or equal to 300 mm, the size of the shell in the second direction is greater than or equal to 68 mm and less than or equal to 100 mm, the size of the shell in the third direction is greater than or equal to 205 mm and less than or equal to 250 mm, and the first direction, the second direction and the third direction intersect with each other.

[0068] In the embodiment, the shell is adapted to the large-size battery cell by limiting the size of the shell in the first direction, the second direction and the third direction.

[0069] The second aspect of the present application provides a battery device comprising the battery cell according to the present application or any of the embodiments of the present application.

[0070] The battery according to the present application has the same beneficial effects as the battery cell according to the present application or any of the embodiments of the present application.

[0071] The third aspect of the present application provides a power consuming device comprising the battery device or the battery cell according to the present application or any of the embodiments of the present application, and the battery is used to provide power for the power consuming device.

[0072] The power consuming device according to the present application has the same beneficial effects as the battery cell according to the present application or any of the embodiments of the present application.

[0073] The fourth aspect of the present application provides an energy storage device comprising the battery device or the battery cell according to the present application or any of the embodiments of the present application.

[0074] The energy storage device according to the present application has the same beneficial effects as the battery cell according to the present application or any of the embodiments of the present application.

[0075] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, which can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0076] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the present application. Moreover, the same reference numbers are used throughout the drawings to represent the same components. In the drawings:

[0077] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0078] Figure 2 The exploded structural schematic diagram of a battery is provided for some embodiments of the present application;

[0079] Figure 3 The exploded structural schematic diagram of a battery cell is provided for some embodiments of the present application;

[0080] Figure 4 The structural schematic diagram of an electrode assembly is provided for some embodiments of the present application;

[0081] Figure 5 A structure diagram of an insulating piece provided for some embodiments of the present application;

[0082] Figure 6 A diagram of one perspective of an insulating piece provided for some embodiments of the present application;

[0083] Figure 7 A partial enlarged diagram of Figure 6 ;

[0084] Figure 8 A further partial enlarged diagram of Figure 6 ;

[0085] Figure 9 A diagram of another perspective of an insulating piece provided for some embodiments of the present application;

[0086] Figure 10 A partial enlarged diagram of Figure 9 ;

[0087] Figure 11 A cross-sectional diagram of A-A in Figure 6 ;

[0088] Reference signs in the detailed description of the embodiments are as follows:

[0089] 1000, vehicle;

[0090] 100, battery; 10, box body; 11, first part; 12, second part; 20, battery cell; 21, end cover; 211, electrode terminal; 212, pressure relief structure; 22, shell; 221, accommodating cavity; 23, electrode assembly; 231, tab; 2311, positive tab; 2312, negative tab; 232, electrode body; 24, connecting sheet; 25, insulating film;

[0091] 30, insulating piece; 31, body part; 311, mounting hole; 32, boss; 321, first boss; 3211, first side surface; 3212, second side surface; 3213, third side surface; 3214, fourth side surface; 322, second boss; 3221, first side surface; 3222, second side surface; 3223, third side surface; 3224, fourth side surface; 3225, first inner side surface; 3226, second inner side surface; 323, third boss; 3231, first side surface; 3232, second side surface; 3233, third side surface; 3234, fourth side surface; 33, first surface;

[0092] 200, controller;

[0093] 300, motor;

[0094] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0095] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0096] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "comprising" as used herein is meant to be open-ended and include the possibility of one or more additional elements.

[0097] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0098] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0099] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0100] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0101] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0102] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0103] With the rapid development of the new energy industry, the demand for high-capacity and long-life batteries is increasing. Improving the system capacity and VED (volumetric energy density) in the same container size is an important direction for battery research and development. As a result, the capacity of the battery monomer (single cell) is increasingly large, and the size and weight of the battery monomer also increase, which poses many challenges to the manufacturing process of the battery.

[0104] Research has found that the design scheme and assembly process of smaller battery monomers are no longer completely applicable to large-size battery monomers. For example, in the production process of prismatic battery monomers, it is found that the edge of the electrode assembly of a large-size battery monomer is more likely to be damaged during assembly compared to a small-size battery monomer, which affects the reliability of the battery monomer.

[0105] Further research found that the co-mingling process of multiple electrode assemblies has a risk of causing damage to the electrode assemblies. Co-mingling refers to combining multiple electrode assemblies to form a battery monomer. Specifically, during the assembly process of a square cell battery monomer, the operation of the co-mingling process of multiple electrode assemblies is roughly as follows: first, place multiple electrode assemblies and insulating pieces flat, then turn over the electrode assemblies so that they are inverted above the insulating pieces, then set the insulating film to the outside of the multiple battery monomers, and connect the insulating film to the insulating pieces. The insulating piece can be a structure that cooperates with the end cover of the battery monomer. In the conventional use state of the battery monomer, the insulating piece is located on the side of the electrode assembly facing the end cover, i.e., it can be located on the top side of the electrode assembly. During the co-mingling process of multiple electrode assemblies, the electrode assemblies need to be turned over and inverted on the insulating pieces. As the weight of the battery monomer increases, the weight of the electrode assemblies also increases. When the electrode assemblies are inverted, the contact position pressure of the electrode assemblies and the insulating pieces increases significantly. The edge side ridge of the insulating piece that contacts the electrode assemblies (a separate side ridge extension is made in the length direction of the insulating piece to ensure the hot melting area of the insulating piece) is easily inserted or pressed into the end face of the electrode assembly after being pressed, causing problems such as deformation and decarburization of the electrode main body. After the electrode assembly is deformed and decarburized, the detached carbon remains in the battery monomer and can cooperate with the shell and electrolyte of the battery monomer to form a small primary cell, which in turn corrodes the shell, shortens the service life of the battery monomer, and can cause quality problems such as battery runaway.

[0106] In some technologies, it is considered to change the co-mingling method of the electrode assemblies so that the electrode assemblies are not inverted as much as possible during the assembly process. However, this method requires a substantial modification of the production line equipment, resulting in a significant increase in production costs. Moreover, research has found that even if the co-mingling method is changed, the risk of damage to the electrode assemblies by the insulating pieces during the co-mingling process can be reduced, but during the handling and transportation of the battery monomer after processing, and during the use of the battery, it is still difficult to avoid the situation of the battery monomer being inverted. When the battery monomer is inverted, the electrode assemblies will still be pressed against the insulating pieces, causing the edge side ridge of the insulating pieces to press against the end face of the electrode assemblies.

[0107] Based on the above research, in order to alleviate the problem that the electrode assembly is easily damaged by the insulating piece, the application provides a battery monomer, which comprises a shell, an end cover, an electrode terminal, an electrode assembly and an insulating piece. The shell has a containing cavity, the end cover seals the containing cavity, the electrode terminal is arranged on the end cover, the electrode assembly is arranged in the shell, the electrode assembly comprises a tab and an electrode body, the tab protrudes from the electrode body to the end cover, and the tab is electrically connected with the electrode terminal. The insulating piece is arranged between the end cover and the electrode body, and the insulating piece comprises a body part and a boss. The boss protrudes from the body part towards the electrode body, the boss comprises a first surface facing the electrode body, and the total area of the first surface is greater than or equal to 1 / a times the weight of the electrode body, wherein a is greater than or equal to 0.008 and less than or equal to 0.026. The unit of the total area is square millimeter, the unit of the weight is newton, and the unit of a is megapascal.

[0108] The battery monomer provided by the application can reduce the pressure intensity when the electrode body contacts the boss, so that the insulating piece can avoid causing pressure injury to the electrode body, that is, the risk of causing the electrode tab to appear decarburization and powder dropping due to the contact between the insulating piece and the electrode body is reduced. Therefore, the electrode assembly can be assembled by the inverted coiling method, and the cost of replacing the production equipment is reduced. At the same time, when the electrode assembly is inverted, the electrode body is not easy to contact the edge part of the side edge of the insulating piece under the support of the first surface. Therefore, the possibility of the edge side ridge of the insulating piece being pressed and inserted into or damaging the end surface of the electrode assembly under various working conditions is reduced, the reliability and service life of the battery monomer are improved, and the possibility of the battery monomer being damaged to cause the battery to lose control is reduced.

[0109] The battery monomer disclosed in the embodiments of the application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery monomer and a battery disclosed in the application. In this way, the battery performance stability and the battery life can be improved by alleviating and automatically adjusting the deterioration of the cell swelling force and supplementing the electrolyte consumption.

[0110] The embodiments of the application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric aircraft toy. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft.

[0111] The following embodiments are described by taking a vehicle 1000 as an example for convenience of illustration.

[0112] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100. The battery device 100 can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0113] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0114] Please refer to Figure 2 , Figure 2 A decomposition structural schematic diagram of a battery is provided for some embodiments of the present application. The battery device 100 includes a box body 10 and a battery monomer 20. The battery monomer 20 is accommodated in the box body 10. The box body 10 is used to provide an accommodation space for the battery monomer 20. The box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12. The first part 11 and the second part 12 are mutually covered. The first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery monomer 20. The second part 12 can be a hollow structure with one end open. The first part 11 can be a plate-shaped structure. The first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define the accommodation space. The first part 11 and the second part 12 can also be hollow structures with one side open. The open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0115] In the battery device 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series or in parallel or in a mixed manner, and then the multiple battery cells 20 are accommodated in the case 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are connected in series or in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole and are accommodated in the case 10. The battery device 100 can also include other structures. For example, the battery device 100 can also include a current collecting member for realizing the electrical connection between the multiple battery cells 20.

[0116] Each battery cell 20 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0117] Please refer to Figure 3 and Figure 4 , Figure 3 the exploded structural view of the battery cell provided by some embodiments of the present application, Figure 4 the structural view of the electrode assembly provided by some embodiments of the present application, the battery cell 20 refers to the smallest unit of the battery. As shown in Figure 3 and Figure 4 , the battery cell 20 includes a housing 22, an end cover 21, an electrode assembly 23, an insulating member 30, and other functional components.

[0118] Among them, the shell 22 has a accommodating cavity 221, which is a component that isolates the internal environment of the battery cell 20 from the external environment. The end cover 21 is a component that is enclosed in the accommodating cavity 221 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cover 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cover 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on the end cover 21. The electrode terminal 211 can be used to electrically connect to the electrode assembly 23 through the connecting piece 24 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 may also be provided with a pressure relief structure 212 for releasing the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a threshold. The pressure relief structure 212 may specifically take the form of an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and may specifically employ a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief structure 212 actuates or a weak structure provided in the pressure relief structure 212 is destroyed, thereby forming an opening or channel for releasing the internal pressure of the battery cell 20. The end cap 21 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present embodiment does not impose any particular limitation on this.

[0119] The housing 22 and end cap 21 cooperate to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and end cap 21 can be independent components. An opening can be provided in the housing 22, and the end cap 21 can be placed over the opening to form the internal environment of the battery cell 20.

[0120] Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell. When the interior of the shell 22 needs to be encapsulated, the end cap 21 is made to cover the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. An insulating film 25 can also be provided in the accommodating cavity 221 of the shell 22, and the insulating film 25 can be coated on the outside of the electrode assembly 23 to isolate the electrode assembly 23 from the shell 22.

[0121] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The electrode assembly 23 includes an electrode body 232 and a tab 231, wherein the electrode body 232 mainly includes the parts of the positive electrode sheet and the negative electrode sheet with active materials, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab 231. The positive tab and the negative tab may be located together at one end of the electrode body 232. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 231 may be connected to the electrode terminal 211 through the connecting piece 24 to form a current loop.

[0122] The insulating part 30 is a component located between the end cap 21 and the electrode assembly 23. The insulating part 30 can be a plastic part. The insulating part 30 can be prefabricated from plastic or assembled from various plastic parts. The material is an insulating material. The insulating part 30 can also be a component of other materials, such as a rubber part. The insulating part 30 has two main functions. First, it can be used to isolate the electrical connection components in the shell 22 from the end cap 21 to reduce the risk of short circuit. Second, it can effectively support the end face of the electrode assembly 23. After the electrode assembly 23 is assembled into the shell and the end cap 21 is welded, the internal winding core of the electrode assembly 23 is in a state of slight pressure. Moreover, the electrode assembly 23 will also be in a vibrating environment during the process of loading and use. If the restraint on the electrode assembly 23 is insufficient, it will easily affect the life of the electrode assembly 23 or cause a short circuit. Therefore, the insulating part 30 needs to effectively support the end face of the electrode assembly 23 to reduce the possibility of the electrode assembly 23 moving up and down.

[0123] According to some embodiments of the present application, referring to Figure 3 and Figure 4 , and combined with Figures 5 to 11 As shown, Figure 5 This is a schematic structural diagram of the insulating member 30 provided in some embodiments of the present application. Figure 6 A schematic diagram of an insulating member 30 provided in some embodiments of the present application from one perspective, Figure 7 for Figure 6 A partial enlarged schematic diagram, Figure 8 for Figure 6 Another partial enlarged schematic diagram, Figure 9 A schematic diagram of another perspective of the insulating member 30 provided in some embodiments of the present application, Figure 10 for Figure 9 A partial enlarged view of Figure 11 for Figure 7 Schematic cross-section of AA.

[0124] The embodiment of the present application provides a battery monomer 20, which comprises an end cover 21, an electrode terminal 211, a shell 22, an electrode assembly 23 and an insulating piece 30, the shell 22 has a containing cavity 221, the end cover 21 closes the containing cavity 221, the electrode terminal 211 is arranged on the end cover 21, the electrode assembly 23 is arranged in the shell 22, the electrode assembly 23 comprises a tab 231 and an electrode body 232, the tab 231 protrudes from the electrode body 232 to the end cover 21, the insulating piece 30 is arranged between the end cover 21 and the electrode body 231, the insulating piece 30 comprises a body part 31 and a boss 32, the boss 32 protrudes from the body part 31 to the electrode body 232, the boss 32 comprises a first surface 33 protruding to the electrode body 232, the total area S of the first surface 33 is greater than or equal to 1 / a times the weight G of the electrode body, wherein a is greater than or equal to 0.008 and less than or equal to 0.026, wherein the unit of the total area S is square millimeter, the unit of the weight G is Newton, and the unit of a is megapascal.

[0125] Specifically, the end cover 21 is provided with the electrode terminal 211, the electrode terminal 211 comprises a positive electrode terminal and a negative electrode terminal, that is to say, the positive electrode terminal and the negative electrode terminal are both arranged on the end cover 21, the positive tab 2311 and the negative tab 2312 are both arranged on the electrode body 232 of the electrode assembly 23 and the side face of the electrode body 232 facing the end cover 21, and the insulating piece 30 is arranged between the electrode body 232 and the end cover 21. Wherein, the positive tab 2311 is electrically connected with the positive electrode terminal, and the negative tab 2312 is electrically connected with the negative electrode terminal.

[0126] The insulating piece 30 is a member that is substantially or cannot conduct electricity under the normal use environment of the battery device 100, the insulating piece 30 can be arranged substantially in parallel with the end cover 21, can be isolated between the electrode assembly 23 and the shell 22, and reduces the possibility that the electrode assembly 23 and the shell 22 form a conductive loop. The insulating piece 30 is a plastic piece.

[0127] The body part 31 and the boss 32 can both be part structures of the insulating piece 30, the body part 31 and the boss 32 can both have insulation performance, the body part 31 and the boss 32 can adopt the same material and are connected or injection molded as an integral structure.

[0128] The body part 31 can be understood as the main part of the insulating piece 30, one side of the body part 31 facing the end cover 21 can be attached to the end cover 21 and can be fixedly connected with the end cover 21, and the connection mode can be riveting, bonding or the like, and the specific connection mode is not limited.

[0129] The boss 32 is disposed on the body portion 31 and protrudes toward the electrode assembly 23 relative to the body portion 31. It can be understood that, at least when the battery body 232 is not inverted, there is a gap between the side of the body portion 31 facing the electrode assembly 23 and the electrode assembly 23. That is, in the case that the insulating piece 30 is in a natural state or the electrode body 232 is not inverted, the first face 33 of the boss 32 facing the electrode body 232 is disposed closer to the electrode assembly 23 relative to the side of the body portion 31 facing the electrode assembly 23, so that in the process of core combination, the first face 33 of the boss 32 facing the electrode body 232 can be in contact with and abut against the electrode body 232, and there is a gap between the side of the body portion 31 facing the electrode body 232 and the electrode assembly 23. Since the boss 32 can provide support, and the body portion 31 is farther away from the electrode assembly 23 relative to the boss 32, in this way, even if the battery assembly 23 is inverted, the electrode body 232 is not easy to contact the body portion 31.

[0130] The total area S of the first face 33 is greater than or equal to 1 / a times the weight G of the electrode body 232, where a is greater than or equal to 0.008 and less than or equal to 0.026, a can be the pressure generated when the electrode body 232 is inverted in the boss 32 and in contact with the first face 33 during the production assembly process, in units of megapascals (Mpa), the total area S of the first face 33 is in units of square millimeters (mm 2 ), and the weight G of the electrode body 232 is in units of newtons (N). That is, the total area S of the first face 33, the pressure a, and the weight G of the electrode body satisfy the relationship:

[0131] a≥G / S, 0.008≤a≤0.026

[0132] When the total area S of the first face 33, the pressure a generated on the first face 33 when the electrode body is inverted, and the weight G of the electrode body 232 satisfy the above relationship, the risk of damage to the electrode body 232 can be avoided.

[0133] The first face 33 can be triangular, rectangular, circular, or other regular or irregular shapes. It can be understood that, if the shape of the first face 33 is rectangular, and the length of the first face 33 is W and the width is L, then the total area S of the first face 33 satisfies: S=W*L.

[0134] The measurement process of the weight G of the electrode body 232 in the finished battery monomer 20 is as follows:

[0135] Specifically, the end cover 21 and the electrode assembly 23 are peeled off from the shell 22. Then, the insulating film 25 outside the electrode assembly 23 is torn off, and the end cover 21 is separated from the electrode assembly 23. Then, the positive and negative electrode ears of the electrode assembly 23 are cut off in sequence. Then, the remaining electrode assembly 23 is spread out flat, and the cathode, the anode and the separator are distinguished. The cathode and the separator are rolled up and put into a polyurethane bag separately. Then, the steel gasket hole is put into the bottom of the centrifugal tube with the open bottom, and the anode tab is rolled up into a cylindrical shape with a diameter slightly smaller than the inner diameter of the centrifugal tube. The anode tab is put into the centrifugal tube, and the centrifugal tube cover is sealed. Then, the centrifugal tube is put into a sample bag. The centrifugal tube is put into a centrifugal machine (model TDL-5-A). The centrifugal speed is set to 3200 rpm, and the time is set to 30 min. Then, the cathode tab and the separator after centrifugation are put into a drying oven. The baking temperature is 105 degrees, and the baking time is 10 hours. Finally, the separator and the cathode tab after baking and the anode tab after centrifugation are weighed separately, and the total weight is the weight G of the electrode main body 232.

[0136] a can be, but is not limited to, 0.008 MPa, 0.01 MPa, 0.012 MPa, 0.015 MPa, 0.018 MPa, 0.02 MPa, 0.025 MPa, 0.026 MPa, etc.

[0137] In the battery monomer 20 of the embodiment, the insulating part 30 is provided with the body part 31 and the boss 32, and the boss 32 protrudes towards the electrode assembly 23 relative to the body part 31, which can improve the strength of the insulating part 30. At the same time, the side surface of the boss 32 can be used for the connection of the insulating film 25. The boss 32 protrudes relative to the body part 31, which can increase the contact area between the insulating part 30 and the insulating film 25, and improve the connection strength and stability. The boss 32 is provided with the first surface 33 protruding towards the electrode main body 232 of the electrode assembly 23. The total area S of the first surface 33 is greater than or equal to 1 / a times the weight G of the electrode main body 232, and 0.008≤a≤0.026. When the electrode assembly 23 is inverted on the boss 32 during the production and assembly process, and the electrode main body 232 is in contact with the first surface 33, the total area S of the first surface 33 can be related to the weight G, which can reduce the pressure when the electrode main body 232 is in contact with the first surface 33, thereby avoiding the boss 32 from causing the electrode main body 232 to be pressed and injured, and improving the reliability of the battery monomer 20. The insulating film 25 can be a cylindrical film structure with one end open. The assembly method of the insulating film 25 can be as follows: after the electrode assembly 23 is inverted on the insulating part 30, the insulating film 25 is wrapped outside the electrode assembly 23. The open end of the insulating film 25 is connected and fixed with the side surface of the boss 32. Specifically, the insulating film 25 can be welded to the side surface of the boss 32.

[0138] According to some embodiments of the present application, optionally, when the weight G of the electrode body 232 is greater than or equal to 49 Newton and less than or equal to 117.6 Newton, the total area of the first surface 33 is greater than or equal to 2800 square millimeters and less than or equal to 7000 square millimeters. It can be understood that the weight G of the electrode body 232 is equal to mg, where m is the mass of the electrode body 232, and g is the acceleration of gravity, g = 9.8 m / s 2 . Then, when the mass m of the electrode body 232 is greater than or equal to 5 kilograms and less than or equal to 12 kilograms, the total area of the first surface 33 is greater than or equal to 2800 square millimeters and less than or equal to 7000 square millimeters.

[0139] The weight G of the electrode body 232 can be, but is not limited to, 49 Newton, 50.96 Newton, 53.9 Newton, 58.8 Newton, 63.7 Newton, 68.6 Newton, 98 Newton, 117.6 Newton, etc.

[0140] For example, when the total area S of the first surface 33 is 3000 square millimeters, and the weight G of the electrode body 232 is 49 Newton, the total area of the first surface 33 and the weight G of the electrode body 232 are brought into the calculation formula of a: a = G / S, to obtain a = 0.0163 MPa. For another example, when the total area S of the first surface 33 is 4000 square millimeters, and the weight G of the electrode body 232 is 68.6 Newton, the total area of the first surface 33 and the weight G of the electrode body 232 are brought into the calculation formula of a: a = G / S, to obtain a = 0.017 MPa.

[0141] In the technical scheme of the present embodiment, the weight G of the electrode body 232 and the total area S of the first surface 33 are limited, so that when the electrode body 232 is inverted on the boss 32 and contacts the first surface 33, the pressure when the electrode body 232 contacts the boss 32 can be reduced to avoid damage to the electrode body 232 by the boss 32, and at the same time, the installation of the tab 231 is not affected by the too large total area of the first surface 33, and the convenience of installation of the tab 231 is improved.

[0142] According to some embodiments of the present application, optionally, when the weight G of the electrode body 232 is greater than or equal to 49 Newton and less than or equal to 68.6 Newton, the total area of the first surface 33 is greater than or equal to 2800 square millimeters and less than or equal to 4000 square millimeters. That is, when the mass m of the electrode body 232 is greater than or equal to 5 kilograms and less than or equal to 7 kilograms, the total area S of the first surface 33 is greater than or equal to 2800 square millimeters and less than or equal to 4000 square millimeters. For example, the mass m of the electrode body 232 can be 5 kilograms, 5.2 kilograms, 5.3 kilograms, 5.5 kilograms, 5.8 kilograms, or 6 kilograms, 6.5 kilograms, or 7 kilograms, etc.

[0143] The technical scheme of the embodiment limits the weight G of the electrode body 232 and the total area S of the first surface 33, so that when the electrode body 232 is inverted on the boss 32 and contacts the first surface 33, the pressure when the electrode body 232 contacts the boss 32 can be reduced to avoid damage to the electrode body 232 by the boss 32, and the installation of the tab 231 is also not affected by the excessively large total area of the first surface 33, thereby improving the convenience of installation of the tab 231.

[0144] In some embodiments of the present application, there is at least one boss 32, each boss 32 includes a first surface 33, and the first surfaces 33 of the at least two bosses 32 are symmetrically arranged about the length center line of the body portion 31. The length center line of the body portion 31 is a line perpendicular to the length direction of the body portion 31 at the midpoint of the length direction of the body portion 31.

[0145] Specifically, the boss 32 can be one, two, three, four, five, six or more, that is, the specific number of the boss 32 is not limited. When there are multiple bosses 32, the multiple bosses 32 can be arranged at intervals along the length direction of the body portion 31 and symmetrically arranged about the length center line of the body portion 31. The side of each boss 32 facing the electrode body 232 is the first surface 33. In this way, the electrode assembly 23 along the length of the body portion 31 can be supported by the multiple bosses 32.

[0146] When the battery cell 20 includes multiple electrode assemblies 23, the multiple electrode assemblies 23 can be arranged in sequence along the width of the body portion 31, and each electrode assembly 23 is supported on the boss 32 at both ends along the length of the body portion 31. For example, in some examples, the body portion 31 can be provided with a boss 32 at each end in the length direction, the boss 32 is connected to the end of the body portion 31 in the length direction, and one side of the boss 32 protrudes towards the electrode assembly 23 relative to the body portion 31.

[0147] In the embodiment, the first surfaces 33 of the multiple bosses 32 are symmetrically arranged about the length center line of the body portion 31, which can ensure that the electrode assembly 23 is uniformly stressed when it contacts different first surfaces 33, and the electrode assembly 23 can have good support stability, avoiding the possibility of being crushed when the electrode body 232 contacts the first surface 33. In addition, the arrangement of the multiple bosses 32 reduces the possibility of excessive local pressure of the electrode assembly 23 and the first surface 33 of the boss 32, and reduces the risk of deformation, crushing, decarburization, etc. of the electrode tab 232.

[0148] Please refer to Figures 5-10In some embodiments of the present application, the protrusions 32 include a first protrusion 321, a second protrusion 322, and a third protrusion 323, which are arranged at intervals along the first direction X, and the tab 231 includes a positive tab 2311 and a negative tab 2312, which are respectively arranged between two adjacent protrusions 32.

[0149] Specifically, along the first direction X, the first protrusion 321 and the third protrusion 323 are located at two ends of the body portion 31 and connected with the body portion 31, the second protrusion 322 is arranged at an interval between the first protrusion 321 and the third protrusion 323 and connected with the body portion 31, and one side of the first protrusion 321, the second protrusion 322, and the third protrusion 323 protrudes towards the electrode assembly 23 relative to the body portion 31. The positive tab 2311 can be located in the interval between the first protrusion 321 and the second protrusion 322, and the negative tab 2312 can be located in the interval between the second protrusion 322 and the third protrusion 323. The side of the first protrusion 321, the second protrusion 322, and the third protrusion 323 towards the electrode assembly 23 is coplanar and is the first face 33. In this way, the electrode assembly 23 can be supported by the first protrusion 321, the second protrusion 322, and the third protrusion 323. The first direction X can be the length direction of the body portion 31, and in the battery cell 20 in the square case form, the first direction X can correspond to the width direction of the battery cell 20.

[0150] In some examples, the first protrusion 321 and the third protrusion 323 can be symmetrically arranged relative to the length center line of the body portion 31, and the second protrusion 322 can be symmetrically arranged relative to the length center line of the body portion 31. The distance between the first protrusion 321 and the second protrusion 322 can be equal to the distance between the second protrusion 322 and the third protrusion 323. In this way, it can be ensured that the electrode assembly 23 is uniformly stressed when it is in contact with different first faces 33, and the electrode assembly 23 can have good support stability, avoiding the possibility that the electrode body 232 is crushed by the first face 33. In addition, the arrangement of multiple protrusions 32 reduces the possibility of excessive local pressure of the electrode assembly 23 and the first face 33 of the protrusion 32, and reduces the risk of deformation, crushing, and decarburization of the electrode tab of the electrode body 232.

[0151] In some embodiments of the present application, please refer to Figure 6 , along the first direction X, the ratio of the sum of the size W1 of the first protrusion 321, the size W2 of the second protrusion 322, and the size W3 of the third protrusion 323 to the size W of the body portion 31 is greater than or equal to 1 / 5 and less than or equal to 2 / 5.

[0152] For example, the ratio of the sum (W1+W2+W3) of the size W1 of the first boss 321, the size W2 of the second boss 322 and the size W3 of the third boss 323 to the size W of the body portion 31, i.e. (W1+W2+W3) / W, can be 1 / 5, 3 / 10, 2 / 5, etc. in the first direction X.

[0153] The size W of the body portion 31 in the first direction X is the perpendicular distance between the two opposite sides of the body portion 31 in the first direction X, and the two opposite sides of the body portion 31 in the first direction X can be arranged substantially in parallel, so that the distance between the two opposite sides of the body portion 31 in the first direction X is substantially the same. The size W of the body portion 31 in the first direction X can be the distance between any position of the two opposite sides of the body portion 31 in the first direction X. When the distance between the two opposite sides of the body portion 31 in the first direction X at different positions is not the same, the size W of the body portion 31 in the first direction X can be the minimum size of the body portion 31 in the first direction X.

[0154] The size of the first boss 321 in the first direction X is the perpendicular distance between the two opposite sides of the first boss 321 in the first direction X, and the two opposite sides of the first boss 321 in the first direction X can be arranged substantially in parallel, so that the distance between the two opposite sides of the first boss 321 in the first direction X is substantially the same.

[0155] The size W2 of the second boss 322 in the first direction X is the perpendicular distance between the two opposite sides of the second boss 322 in the first direction X, and the two opposite sides of the second boss 322 in the first direction X can be arranged substantially in parallel, so that the distance between the two opposite sides of the second boss 322 in the first direction X is substantially the same. The size W2 of the second boss 322 in the first direction X can be the distance between any position of the two opposite sides of the second boss 322 in the first direction X.

[0156] The size W3 of the third boss 323 in the first direction X is the perpendicular distance between the two opposite sides of the third boss 323 in the first direction X, and the two opposite sides of the third boss 323 in the first direction X can be arranged substantially in parallel, so that the distance between the two opposite sides of the third boss 323 in the first direction X is substantially the same. The size W3 of the third boss 323 in the first direction X can be the distance between any position of the two opposite sides of the third boss 323 in the first direction X. It can be understood that when the distance between the two opposite sides of the third boss 323 in the first direction X at different positions is not the same, the size W3 of the third boss 323 in the first direction X can be the maximum size of the third boss 323 in the first direction X.

[0157] In the battery cell 20 of this embodiment, the dimensions of the first, second and third protrusions 321, 322 and 323 in the first direction X are defined as follows. Specifically, the ratio of the sum of the dimensions W1, W2 and W3 of the first, second and third protrusions 321, 322 and 323 to the dimension W of the body portion 31 in the first direction X, i.e., (W1+W2+W3) / W, is greater than or equal to 1 / 5, so that the electrode body 232 can be better supported by the protrusions 32 when the electrode body 232 is inverted, and the electrode body 232 can be better supported and stabilized to prevent damage to the electrode body 232. The ratio of the sum of the dimensions W1, W2 and W3 of the first, second and third protrusions 321, 322 and 323 to the dimension W of the body portion 31 in the first direction X, i.e., (W1+W2+W3) / W, is less than or equal to 2 / 5, so that the first, second and third protrusions 321, 322 and 323 can avoid the tab 231 and improve the convenience of mounting the tab 231.

[0158] In some embodiments of the present application, the ratio of the dimension W1 of the first protrusion 321 to the dimension W of the body portion 31 in the first direction X, i.e., W1 / W, is greater than or equal to 3 / 50 and less than or equal to 1 / 6. For example, the ratio of the dimension W1 of the first protrusion 321 to the dimension W of the body portion 31 can be 3 / 50, 2 / 25, 1 / 10, 1 / 6, etc.

[0159] In this embodiment, the dimension W1 of the first protrusion 321 in the first direction X is defined to improve the support area of the first protrusion 321 for the electrode body 232 while maintaining the convenience of assembling the tab 231, thereby reducing the risk of damage, decarburization and powder loss of the electrode body 232 when the large-size electrode assembly 23 is inverted.

[0160] In some embodiments of the present application, please refer to Figures 6-9 The ratio of the dimension W2 of the second protrusion 322 to the dimension W of the body portion 31 in the first direction X is greater than 0 and less than or equal to 7 / 25. For example, the ratio of the dimension of the second protrusion 322 to the dimension of the body portion 31 can be 1 / 25, 2 / 25, 3 / 25, 4 / 25, 5 / 25, 7 / 25, etc.

[0161] In this embodiment, the dimension W2 of the second protrusion 322 in the first direction X is defined to improve the support area of the second protrusion 322 for the electrode body 232 while maintaining the convenience of assembling the tab 231, thereby reducing the risk of damage, decarburization and powder loss of the electrode body 232 when the large-size electrode body 232 is inverted on the second protrusion 322.

[0162] In some embodiments of the present application, please refer to Figure 6In the embodiment, the ratio of the size W3 of the third protrusion 323 to the size W of the body portion 31 in the first direction X is greater than or equal to 3 / 50 and less than or equal to 1 / 6. For example, the ratio of the size W3 of the third protrusion 323 to the size W of the body portion 31 can be 3 / 50, 2 / 25, 1 / 10, 1 / 6, etc.

[0163] In the embodiment, the limitation on the size W3 of the third protrusion 323 in the first direction X can improve the supporting area of the third protrusion 323 to the electrode body 232 while maintaining the convenience of assembling the tab 231, and reduce the risk of the third protrusion 323 causing the electrode body 232 to be pressed and decarburized and powder to fall off when the electrode body 232 is inverted.

[0164] In some embodiments of the present application, the size of the body portion 31 in the first direction X is greater than or equal to 160 mm and less than or equal to 310 mm; and / or, the sizes W1 of the first protrusion 321, the sizes W2 of the second protrusion 322, and the sizes W3 of the third protrusion 323 in the first direction X are all greater than or equal to 16 mm, and the sum of the sizes W1 of the first protrusion 321, the sizes W2 of the second protrusion 322, and the sizes W3 of the third protrusion 323 is less than or equal to 124 mm.

[0165] The size W of the body portion 31 can be 160 mm, 165 mm, 170 mm, 172 mm, 175 mm, 180 mm, 200 mm, 220 mm, 250 mm, 280 mm, 310 mm, etc.

[0166] In the embodiment, the size W of the body portion 31 in the first direction X is limited so that the insulating piece 30 can be applied to a large-size battery cell, and the sizes W1 of the first protrusion 321, the sizes W2 of the second protrusion 322, and the sizes W3 of the third protrusion 323 are limited so that the total area of the first surface 33 can meet the supporting requirements of the electrode body 232, while avoiding excessive local pressure that can cause local damage to the electrode body 232.

[0167] In some embodiments of the present application, optionally, please refer to Figure 6 In the second direction Y, the sizes L1 of the first protrusion 321, the sizes L2 of the second protrusion 322, and the sizes L3 of the third protrusion 323 are all equal to the size L of the body portion 31.

[0168] The second direction Y can be a width direction of the body portion 31, and in the case of a battery cell 20 in a square shape, the second direction Y can correspond to a thickness direction of the battery cell 20. The dimension L of the body portion 31 in the second direction Y is substantially the same as the dimension of the electrode assembly 23, and is a vertical distance between the two side surfaces of the insulating member 30 in the second direction Y. The two side surfaces of the insulating member 30 in the second direction Y can be arranged substantially parallel to each other, so that the distance between the two side surfaces of the insulating member 30 in the second direction Y is substantially the same. The dimension L of the body portion 31 can be the distance between the two side surfaces of the insulating member 30 in the second direction Y at any position. In the case where the distance between the two side surfaces of the insulating member 30 in the second direction Y is not the same at different positions, the dimension L of the body portion 31 can be the smallest dimension between the two side surfaces of the insulating member 30 in the second direction Y.

[0169] The dimension L1 of the first protrusion 321 is a vertical distance between the two side surfaces of the first protrusion 321 in the second direction Y. The two side surfaces of the first protrusion 321 in the second direction Y can be arranged substantially parallel to each other, so that the distance between the two side surfaces of the first protrusion 321 in the second direction Y is substantially the same. The dimension L1 of the first protrusion 321 can be the distance between the two side surfaces of the first protrusion 321 in the second direction Y at any position. In the case where the distance between the two side surfaces of the first protrusion 321 in the second direction Y is not the same at different positions, the dimension L1 of the first protrusion 321 can be the largest dimension between the two side surfaces of the first protrusion 321 in the second direction Y.

[0170] The dimension L2 of the second protrusion 322 is a vertical distance between the two side surfaces of the second protrusion 322 in the second direction Y. The two side surfaces of the second protrusion 322 in the second direction Y can be arranged substantially parallel to each other, so that the distance between the two side surfaces of the second protrusion 322 in the second direction Y is substantially the same. The dimension L2 of the second protrusion 322 can be the distance between the two side surfaces of the second protrusion 322 in the second direction Y at any position. In the case where the distance between the two side surfaces of the second protrusion 322 in the second direction Y is not the same at different positions, the dimension L2 of the second protrusion 322 can be the largest dimension between the two side surfaces of the second protrusion 322 in the second direction Y.

[0171] The size L3 of the third protrusion 323 is a vertical distance between two opposite sides of the third protrusion 323 in the second direction Y. The two opposite sides of the third protrusion 323 in the second direction Y can be arranged substantially in parallel, so that the distance between the two opposite sides of the third protrusion 323 in the second direction Y is substantially the same. The size L3 of the third protrusion 323 can be the distance between any positions of the two opposite sides of the third protrusion 323 in the second direction Y. When the distance between the two opposite sides of the third protrusion 323 in the second direction Y at different positions is not the same, the size L3 of the third protrusion 323 can be the maximum size between the two opposite sides of the third protrusion 323 in the second direction Y.

[0172] In the embodiment, the sizes (L1, L2, L3) of the first protrusion 321, the second protrusion 322, and the third protrusion 323 in the second direction Y are limited. The two end sides of the first protrusion 321, the second protrusion 322, and the third protrusion 323 along the second direction Y can be used for the bonding connection of the insulating film 25, so that the contact area of the insulating member 30 and the insulating film 25 can be increased, and the connection strength and stability of the insulating member 30 are improved.

[0173] In some embodiments of the present application, the size L of the body part 31 in the second direction Y is greater than or equal to 68 mm and less than or equal to 100 mm. For example, the size L of the body part 31 can be 68 mm, 70 mm, 75 mm, 80 mm, 90 mm, 95 mm, or 100 mm, etc.

[0174] In the embodiment, the size L of the body part 31 is limited. Specifically, the size L of the body part 31 is greater than or equal to 68 mm, so that the size of the first surface 33 in the second direction Y is not too narrow, and the possibility that the contact area between the electrode body 232 and the first surface 33 is too small to cause the protrusion 32 to be damaged by the electrode body 232 is reduced. The size L of the body part 31 is less than or equal to 100 mm, so as to avoid that the volume of the battery monomer 20 is too large, and the safety performance of the battery monomer 20 is ensured.

[0175] In some embodiments of the present application, the size L of the body part 31 in the second direction Y is greater than or equal to 70 mm and less than or equal to 75 mm.

[0176] In the embodiment, the size L of the body part 31 is limited, so that the size of the first surface 33 in the second direction Y is not too narrow, and the total area of the first surface 33 is ensured. In this way, when the protrusion 32 contacts the electrode body 232, the possibility that the electrode body 232 is damaged can be avoided.

[0177] In some embodiments of the present application, optionally, please refer to Figure 9 and Figure 10The size H of the boss 32 is greater than or equal to 2.5 mm and less than or equal to 10 mm in the third direction Z.

[0178] It should be noted that the first direction X, the second direction Y and the third direction Z can be substantially perpendicular to each other. Specifically, the first direction X can be the length direction of the body part 31, in the battery cell 20 in the square shell form, the first direction X can correspond to the width direction of the battery cell 20; the second direction Y can be the width direction of the body part 31, in the battery cell 20 in the square shell form, the second direction Y can correspond to the thickness direction of the battery cell 20; the third direction Z can be the thickness direction of the body part 31, in the battery cell 20 in the square shell form, the third direction Z can correspond to the height direction of the battery cell 20.

[0179] The size H of the boss 32 can be 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm or 10 mm, etc.

[0180] In some embodiments of the present application, please continue to refer to Figures 5-10 The first boss 321 includes a first side surface 3211, a second side surface 3212, a third side surface 3213 and a fourth side surface 3214, and is provided with a first fillet R11, a second fillet R12, a third fillet R13 and a fourth fillet R14. In the first direction X, the first side surface 3211 and the third side surface 3213 are located at both ends of the first boss 321. In the second direction Y, the second side surface 3212 and the fourth side surface 3214 are located at both ends of the first boss 321. The first side surface 3211 and the first surface 33 form the third fillet R11, the second side surface 3212 and the first surface 33 form the second fillet R12, the third side surface 3213 and the first surface 33 form the third fillet R13, and the fourth side surface 3214 and the first surface 33 form the fourth fillet R14. The first direction X is the length direction of the body part 31, and the second direction Y is the width direction of the body part 31. The plane formed by the first direction X and the second direction Y is substantially parallel to the insulating piece 30.

[0181] Specifically, the first side surface 3211, the second side surface 3212, the third side surface 3213 and the fourth side surface 3214 of the first boss 321 are connected between the first surface 33 and the body part 31, wherein, along the first direction X, the first side surface 3211 and the third side surface 3213 are arranged in parallel at two ends of the first boss 321, and the first side surface 3211 is located on the side of the third side surface 3213 away from the second boss 322; along the second direction Y, the second side surface 3212 and the fourth side surface 3214 are arranged in parallel at two ends of the first boss 321. Any position of the first side surface 3211, the second side surface 3212, the third side surface 3213 and the fourth side surface 3214 can form a first chamfer R11, a second chamfer R12, a third chamfer R13 and a fourth chamfer R14, respectively, between the first surface 33.

[0182] In the embodiment, the first chamfer R11, the second chamfer R12, the third chamfer R13 and the fourth chamfer R14 are arranged on the first boss 321, so that the periphery of the first surface 33 is smoothly transitioned, better transition buffering is achieved, and when the first surface 33 of the first boss 321 abuts against the electrode body 232 of the electrode assembly 23, the shear effect of the electrode body 232 caused by too large difference at the junction is reduced, and the safety of the electrode body 232 is ensured.

[0183] In some embodiments of the present application, optionally, referring to Figures 5-6 , the first boss 321 is further provided with a fifth chamfer R15, a sixth chamfer R16, a seventh chamfer R17 and an eighth chamfer R18; the fifth chamfer R15 is formed between the first side surface 3211 and the second side surface 3212; the sixth chamfer R16 is formed between the second side surface 3212 and the third side surface 3213; the seventh chamfer R17 is formed between the third side surface 3213 and the fourth side surface 3214; and the eighth chamfer R18 is formed between the first side surface 3211 and the fourth side surface 3214.

[0184] In the embodiment, the fifth chamfer R15, the sixth chamfer R16, the seventh chamfer R17 and the eighth chamfer R18 are arranged on the first boss 321, so that the first boss 321 is prevented from being clamped to the shell 22 during assembly, the assembly efficiency and quality of the battery monomer 20 are improved, and the demolding of the first boss 321 is facilitated in the production process of the insulating piece 30.

[0185] In some embodiments of the present application, the curvature radius of the first chamfer R11 is greater than or equal to 1 millimeter and less than or equal to 1 / 3 times the size W1 of the first boss 321 in the first direction X; and / or the curvature radius of the third chamfer R13 is greater than or equal to 1 millimeter and less than or equal to 1 / 3 times the size W1 of the first boss 321 in the first direction X.

[0186] The curvature radius of the first chamfer R11 can be the same as or different from the curvature radius of the third chamfer R13. Preferably, the curvature radius of the first chamfer R11 is the same as the curvature radius of the third chamfer R13.

[0187] For example, the dimension W1 of the first boss 321 in the first direction X is 18 mm, and the curvature radius of the first chamfer R11 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm, etc. The curvature radius of the third chamfer R13 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm, etc. The accuracy of the curvature radius can be accurate to two decimal places.

[0188] In this embodiment, the curvature radius of the first chamfer R11 and the third chamfer R13 is limited, which can avoid the shear effect of the electrode body 232 caused by the large difference at the junction when the two ends of the first boss 321 in the first direction contact the electrode body 232, thereby protecting the electrode body 232. At the same time, the area of the first face 33 of the first boss 321 can be ensured, and the risk of pressure deformation, bruising, decarburization, etc. of the electrode body 232 caused by the first boss 321 is reduced.

[0189] In some embodiments of the present application, the curvature radius of the second chamfer R12 is greater than or equal to 1 mm and less than or equal to 3 mm, and / or the curvature radius of the fourth chamfer R14 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0190] The curvature radius of the second chamfer R12 can be the same as or different from the curvature radius of the fourth chamfer R14. Preferably, the curvature radius of the second chamfer R12 is the same as the curvature radius of the fourth chamfer R14.

[0191] For example, the curvature radius of the second chamfer R12 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. The curvature radius of the fourth chamfer R14 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. The accuracy of the curvature radius can be accurate to two decimal places.

[0192] In this embodiment, the curvature radius of the second chamfer R12 and the fourth chamfer R14 is limited, which can avoid the shear effect of the electrode body 232 caused by the large difference at the junction when the two ends of the first boss 321 in the second direction contact the electrode body 232, thereby protecting the electrode body 232. At the same time, the area of the first face 33 of the first boss 321 can be ensured, and the risk of pressure deformation, bruising, decarburization, etc. of the electrode body 232 caused by the first boss 321 is reduced.

[0193] It should be further explained that the central angle corresponding to the first chamfer R11, the second chamfer R12, the third chamfer R13 and the fourth chamfer R14 can be approximately 90 degrees, that is, approximately 1 / 4 of a circular arc. In this embodiment, the value of the central angle corresponding to the first chamfer R11, the second chamfer R12, the third chamfer R13 and the fourth chamfer R14 can be 80 degrees to 100 degrees, for example, 80 degrees, 85 degrees, 88 degrees, 89 degrees, 90 degrees, 91 degrees, 92 degrees, 95 degrees, 100 degrees, etc. It can be understood that the central angle corresponding to the first chamfer R11, the second chamfer R12, the third chamfer R13 and the fourth chamfer R14 can be approximately 90 degrees, which can make the first side surface 3211, the second side surface 3212, the third side surface 3213 and the fourth side surface 3214 and the first surface 33 transition smoothly.

[0194] In some embodiments of the present application, the fifth chamfer R15 and the eighth chamfer R18 are both arc-shaped chamfers; the radius of curvature of the fifth chamfer R15 is greater than or equal to 4 mm and less than or equal to 8 mm; and / or the radius of curvature of the eighth chamfer R18 is greater than or equal to 4 mm and less than or equal to 8 mm.

[0195] The radius of curvature of the fifth chamfer R15 and the radius of curvature of the eighth chamfer R18 can be the same or different, and preferably the radius of curvature of the fifth chamfer R15 and the radius of curvature of the eighth chamfer R18 are the same.

[0196] For example, the radius of curvature of the fifth chamfer R15 can be 4 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5 mm, 6 mm, 7 mm or 8 mm, etc. The radius of curvature of the eighth chamfer R18 can be 4 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5 mm, 6 mm, 7 mm or 8 mm, etc. The accuracy of the radius of curvature can be accurate to two decimal places.

[0197] In this embodiment, the radius of curvature of the fifth chamfer R15 and the radius of curvature of the eighth chamfer R18 are greater than or equal to 4 mm, which can avoid the first boss 321 from being engaged with the shell 22 during assembly; and the radius of curvature of the fifth chamfer R15 and the radius of curvature of the eighth chamfer R18 are less than or equal to 8 mm, which can avoid the radius of curvature of the fifth chamfer R15 and the radius of curvature of the eighth chamfer R18 being too large, so that the straight edges of the first side surface 3211, the second side surface 3212 and the fourth side surface 3214 become sharp edges that can damage the electrode body 232.

[0198] In some embodiments of the present application, the sixth chamfer R16 and the seventh chamfer R17 are both arc-shaped chamfers; the radius of curvature of the sixth chamfer R16 is greater than or equal to 1 mm and less than or equal to 4 mm; and / or the radius of curvature of the seventh chamfer R17 is greater than or equal to 1 mm and less than or equal to 4 mm.

[0199] The radius of curvature of the sixth chamfer R16 and the seventh chamfer R17 can be the same or different, and preferably, the radius of curvature of the sixth chamfer R16 and the seventh chamfer R17 is the same.

[0200] The radius of curvature of the fifth chamfer R15 can be 1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, or 8 mm, etc. The radius of curvature of the eighth chamfer R18 can be 1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, or 8 mm. The accuracy of the radius of curvature can be accurate to two decimal places.

[0201] In the present embodiment, the radius of curvature of the sixth chamfer R16 and the seventh chamfer R17 is greater than or equal to 1 mm, so that the first boss 321 is significantly distinguished from the round corner (0.2 mm) of the mold, and the transition is smooth, reducing the effect of shearing, facilitating the demolding of the first boss 321. On the other hand, the radius of curvature of the sixth chamfer R16 and the seventh chamfer R17 is less than or equal to 4 mm, which can ensure the contact area of the first face 33 on the first boss 321 while avoiding the straight edges of the second side face 3212, the third side face 3213, and the fourth side face 3214 being too small to become sharp edges and causing damage to the electrode body 232.

[0202] In some embodiments of the present application, as shown in Figure 5 and 9 The second boss 322 includes a fifth side face 3221, a sixth side face 3222, a seventh side face 3223, and an eighth side face 3224, and is provided with a ninth chamfer R21, a tenth chamfer R22, an eleventh chamfer R23, and a twelfth chamfer R24. Along the first direction X, the fifth side face 3221 and the seventh side face 3223 are located at the two ends of the first boss 321. Along the second direction Y, the sixth side face 3222 and the eighth side face 3224 are located at the two ends of the second boss 322. The ninth chamfer R21 is formed between the fifth side face 3221 and the first face 33. The tenth chamfer R22 is formed between the sixth side face 3222 and the first face 33. The eleventh chamfer R23 is formed between the seventh side face 3223 and the first face 33. The twelfth chamfer R24 is formed between the eighth side face 3224 and the first face 33.

[0203] Specifically, the fifth side surface 3221, the sixth side surface 3222, the seventh side surface 3223 and the eighth side surface 3224 of the second boss 322 are connected between the first surface 33 of the second boss 322 and the body portion 31, wherein the fifth side surface 3221 and the seventh side surface 3223 are arranged at two ends of the second boss 322 along the first direction X, and the sixth side surface 3222 and the eighth side surface 3224 are arranged at two ends of the second boss 322 along the second direction Y. Any position of the fifth side surface 3221, the sixth side surface 3222, the seventh side surface 3223 and the eighth side surface 3224 can form a ninth chamfer R21, a tenth chamfer R22, an eleventh chamfer R23 and a twelfth chamfer R24, respectively, between the first surface 33 of the second boss 322.

[0204] The ninth chamfer R21, the tenth chamfer R22, the eleventh chamfer R23 and the twelfth chamfer R24 arranged on the second boss 322 in the embodiment can make the periphery of the first surface 33 of the second boss 322 transition smoothly, play a better transition buffering role, and reduce the risk of the electrode body 232 being pressed, decarburized and powdering due to the too large difference at the junction when the first surface 33 of the second boss 322 abuts against the electrode body 232 of the electrode assembly 23.

[0205] Please refer to Figure 9 and Figure 10 In some implementations, the fifth side surface 3221 and the body portion 31 form an included angle ∠1, and the seventh side surface 3223 and the body portion 31 form an included angle ∠2, wherein the included angle ∠1 is greater than 0 degrees and less than or equal to 90 degrees, and the included angle ∠2 is greater than 0 degrees and less than or equal to 90 degrees.

[0206] In the embodiment, the fifth side surface 3221 and / or the seventh side surface 3223 form an acute angle with the body portion 31, which can improve the structural stability of the second boss 322 and improve the strength of the second boss 322.

[0207] In some embodiments of the present application, the second boss 322 is further provided with a thirteenth chamfer R25, a fourteenth chamfer R26, a fifteenth chamfer R27 and a sixteenth chamfer R28; the thirteenth chamfer R25 is formed between the fifth side surface 3221 and the sixth side surface 3222; the fourteenth chamfer R26 is formed between the sixth side surface 3222 and the seventh side surface 3223; the fifteenth chamfer R27 is formed between the seventh side surface 3223 and the eighth side surface 3224; and the sixteenth chamfer R28 is formed between the fifth side surface 3221 and the eighth side surface 3224.

[0208] In the embodiment, the thirteenth chamfer R25, the fourteenth chamfer R26, the fifteenth chamfer R27 and the sixteenth chamfer R28 are arranged on the second boss 322, so that the second boss 322 is prevented from being clamped to the shell 22 during assembly, and the assembly efficiency and quality of the battery monomer 20 are improved.

[0209] In some embodiments of the application, the ninth chamfer R21 and the eleventh chamfer R23 are circular arc chamfers; the curvature radius of the ninth chamfer R21 is greater than or equal to 1 mm and less than or equal to 1 / 2 times the difference between the size W2 of the second boss 322 and the size W4 of the sixth side surface 3222 along the first direction X, i.e., the curvature radius of the ninth chamfer R21 is greater than or equal to 1 mm and less than or equal to (W2-W4) / 2; and / or the curvature radius of the eleventh chamfer R23 is greater than or equal to 1 mm and less than or equal to 1 / 2 times the difference between the size of the second boss 322 and the size of the sixth side surface 3222 along the first direction X, i.e., the curvature radius of the eleventh chamfer R23 is greater than or equal to 1 mm and less than or equal to (W2-W4) / 2.

[0210] The curvature radius of the ninth chamfer R21 and the curvature radius of the eleventh chamfer R23 can be the same or different, and preferably, the curvature radius of the ninth chamfer R21 and the curvature radius of the eleventh chamfer R23 are the same.

[0211] For example, the size W2 of the second boss 322 along the first direction X is 18 mm, and the size of the sixth side surface 3222 along the first direction X is 6 mm, and the curvature radius of the ninth chamfer R21 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 6 mm, etc. The curvature radius of the eleventh chamfer R13 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 6 mm, etc. The accuracy of the curvature radius can be accurate to two decimal places.

[0212] In the embodiment, the curvature radius of the ninth chamfer R21 and the eleventh chamfer R23 of the second boss 322 is limited, which can ensure that the ninth chamfer R21 and the eleventh chamfer R23 play a role in transition and buffering, and at the same time, the area of the first surface 33 in the second boss 322 is increased, and the risk of deformation, bruising and decarburization of the electrode main body 232 caused by the second boss 322 is reduced.

[0213] In some embodiments of the application, the curvature radius of the tenth chamfer R21 is greater than or equal to 1 mm and less than or equal to 3 mm; and / or the curvature radius of the twelfth chamfer R24 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0214] The curvature radius of the tenth chamfer R22 and the curvature radius of the twelfth chamfer R24 can be the same or different, and preferably, the curvature radius of the tenth chamfer R22 and the curvature radius of the twelfth chamfer R24 are the same.

[0215] The curvature radius of the tenth chamfer R22 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. The curvature radius of the twelfth chamfer R24 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. The accuracy of the curvature radius can be accurate to two decimal places.

[0216] In this embodiment, the curvature radius of the tenth chamfer R22 and the twelfth chamfer R24 is limited, so that the periphery of the first surface 33 on the second boss 322 transitions smoothly in the second direction, which plays a better transition buffering role, avoids the occurrence of too large interface drop when the two ends of the second boss 322 contact the electrode body 232 in the second direction, which causes the shear effect of the electrode body 232, and protects the electrode body 232. At the same time, it can guarantee the area of the first surface 33 of the second boss 322, and reduce the risk of pressure deformation, bruising, decarburization, etc. of the electrode body 232 caused by the second boss 322.

[0217] In some implementations, the tenth chamfer R22 and the twelfth chamfer R24 can also be non-circular chamfers such as ellipses.

[0218] It should be further noted that the ninth chamfer R21, the tenth chamfer R22, the eleventh chamfer R23, and the twelfth chamfer R24 of the second boss 322 correspond to a central angle of a circle that can be approximately 90 degrees, i.e., approximately 1 / 4 of a circle. The value of the central angle of the circle corresponding to the ninth chamfer R21, the tenth chamfer R22, the eleventh chamfer R23, and the twelfth chamfer R24 in this embodiment can be 80 degrees to 100 degrees, for example, 80 degrees, 85 degrees, 88 degrees, 89 degrees, 90 degrees, 91 degrees, 92 degrees, 95 degrees, 100 degrees, etc. It can be understood that the central angle of the circle corresponding to the ninth chamfer R21, the tenth chamfer R22, the eleventh chamfer R23, and the twelfth chamfer R24 can be approximately 90 degrees, which can make the fifth side surface 3221, the sixth side surface 3222, the seventh side surface 3223, and the eighth side surface 3224 of the second boss 322 transition smoothly with the first surface 33.

[0219] In some embodiments of the present application, the thirteenth chamfer R25, the fourteenth chamfer R26, the fifteenth chamfer R27 and the sixteenth chamfer R28 are all arc-shaped chamfers; the curvature radius of the thirteenth chamfer is greater than or equal to 1 mm and less than or equal to 8 mm; and / or the curvature radius of the fourteenth chamfer is greater than or equal to 1 mm and less than or equal to 8 mm; and / or the curvature radius of the fifteenth chamfer is greater than or equal to 1 mm and less than or equal to 8 mm; and / or the curvature radius of the sixteenth chamfer is greater than or equal to 1 mm and less than or equal to 8 mm.

[0220] The curvature radius of the thirteenth chamfer R25, the fourteenth chamfer R26, the fifteenth chamfer R27 and the sixteenth chamfer R28 can be the same or different. Preferably, the curvature radius of the thirteenth chamfer R25, the fourteenth chamfer R26, the fifteenth chamfer R27 and the sixteenth chamfer R28 is the same. The curvature radius of the thirteenth chamfer R25, the fourteenth chamfer R26, the fifteenth chamfer R27 and the sixteenth chamfer R28 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm or 8 mm, etc. The accuracy of the curvature radius can be accurate to two decimal places.

[0221] In the present embodiment, the limitation of the curvature radius of the thirteenth chamfer R25, the fourteenth chamfer R26, the fifteenth chamfer R27 and the sixteenth chamfer R28 makes the second boss 322 significantly distinguished from the fillet of the mold, which can smoothly transition and reduce the effect of shearing, facilitating the demolding of the second boss 322. On the other hand, while ensuring the contact area of the second boss 322, it can avoid the side edge of the second boss 322 being too small to become a sharp edge and causing damage to the electrode body 232.

[0222] In some embodiments of the present application, referring to Figure 6 and Figure 11 , the second boss 322 is provided with a receiving groove 3227 facing the pressure relief mechanism 212, the receiving groove 3227 includes a first inner side surface 3225 and a second inner side surface 3226, the second inner side surface 3226 and the second inner side surface 3226 are oppositely arranged along the first direction X; the included angle ∠3 formed between the first inner side surface 3225 and the body portion 31 is greater than 0 and less than or equal to 90 degrees; and / or the included angle ∠4 formed between the second inner side surface 3226 and the body portion 31 is greater than 0 and less than or equal to 90 degrees.

[0223] The included angle ∠3 formed between the first inner side surface 3225 and the body portion 31 can be 90 degrees, 89.5 degrees, 89 degrees, 88 degrees, 85 degrees, 80 degrees, 75 degrees, 70 degrees, 60 degrees, etc. The included angle ∠4 formed between the second inner side surface 3226 and the body portion 31 can be 90 degrees, 89.5 degrees, 89 degrees, 88 degrees, 85 degrees, 80 degrees, 75 degrees, 70 degrees, 60 degrees, etc. It should be noted that the included angle ∠3 formed between the first inner side surface 3225 and the body portion 31 can be equal to or different from the included angle ∠4 formed between the second inner side surface 3226 and the body portion 31.

[0224] In this embodiment, the accommodation groove 3227 is arranged to facilitate the flow of gas or electrolyte to the pressure relief mechanism 212. When the battery monomer 20 is in thermal runaway, the exhaust inside the battery monomer 20 can flow to the pressure relief mechanism 212 through the accommodation groove 3227. The included angles formed between the first inner side surface 3225 and the body portion 31 and between the second inner side surface 3226 and the body portion 31 can make the second boss 322 structure more stable and improve the strength of the second boss 322.

[0225] In some embodiments of the present application, continuing to refer to Figures 5 to 10 As shown in FIG. 13, the third boss 323 includes a ninth side surface 3231, a tenth side surface 3232, an eleventh side surface 3233, and a twelfth side surface 3234, and is provided with a seventeenth fillet R31, an eighteenth fillet R32, a nineteenth fillet R33, and a twentieth fillet R34. Along the first direction X, the ninth side surface 3231 and the eleventh side surface 3233 are located at the two ends of the third boss 323. Along the second direction Y, the tenth side surface 3232 and the twelfth side surface 3234 are located at the two ends of the third boss 323. The ninth side surface 3231 and the first surface 33 form the seventeenth fillet R31, the tenth side surface 3232 and the first surface 33 form the eighteenth fillet R32, the eleventh side surface 3233 and the first surface 33 form the nineteenth fillet R33, and the twelfth side surface 3234 and the first surface 33 form the twentieth fillet R34. The second direction Y is the width direction of the body portion 31.

[0226] Specifically, the ninth side surface 3231, the tenth side surface 3232, the eleventh side surface 3233 and the twelfth side surface 3234 of the third protrusion 323 are connected between the first surface 33 and the body portion 31 of the third protrusion 323, wherein, along the first direction X, the ninth side surface 3231 and the eleventh side surface 3233 are arranged in parallel at two ends of the third protrusion 323, and the ninth side surface 3231 is located on the side of the eleventh side surface 3233 away from the second protrusion 322; along the second direction Y, the tenth side surface 3232 and the twelfth side surface 3234 are located at two ends of the first protrusion 321 and arranged in parallel with each other. Any position of the ninth side surface 3231, the tenth side surface 3232, the eleventh side surface 3233 and the twelfth side surface 3234 can form a seventeenth fillet R31, an eighteenth fillet R32, a nineteenth fillet R33 and a twentieth fillet R34, respectively, between the first surface 33.

[0227] In the embodiment, the seventeenth fillet R31, the eighteenth fillet R32, the nineteenth fillet R33 and the twentieth fillet R34 are arranged on the third protrusion 323, so that the periphery of the first surface 33 on the third protrusion 323 is smoothly transitioned, which plays a better transition buffering role, reduces the shear effect of the electrode body 232 caused by the large difference at the junction when the first surface 33 of the third protrusion 323 abuts against the electrode body 232 of the electrode assembly 23, and reduces the risk of crushing, decarburization and powder falling of the electrode body 232.

[0228] In some embodiments of the application, the third protrusion 323 is further provided with a twenty-first fillet R35, a twenty-second fillet R36, a twenty-third fillet R37 and a twenty-fourth fillet R38; the twenty-first fillet R35 is formed between the ninth side surface 3231 and the tenth side surface 3232; the twenty-second fillet R36 is formed between the tenth side surface 3232 and the eleventh side surface 3233; the twenty-third fillet R37 is formed between the eleventh side surface 3233 and the twelfth side surface 3234; and the twenty-fourth fillet R38 is formed between the ninth side surface 3231 and the twelfth side surface 3234.

[0229] In the embodiment, the twenty-first fillet R35, the twenty-second fillet R36, the twenty-third fillet R37 and the twenty-fourth fillet R38 are arranged on the third protrusion 323, which can avoid the first protrusion 321 being clamped to the shell 22 during assembly, thereby improving the assembly efficiency and quality of the battery monomer 20, and facilitating the demolding of the first protrusion 321 in the production process of the insulating piece 30.

[0230] In some embodiments of the present application, the seventeenth chamfer R31 and the nineteenth chamfer R33 of the third protrusion 323 are circular arc chamfers; the radius of curvature of the seventeenth chamfer R31 is greater than or equal to 1 millimeter and less than or equal to 1 / 3 times the size of the first protrusion 321 in the first direction X; and / or the radius of curvature of the nineteenth chamfer R33 is greater than or equal to 1 millimeter and less than or equal to 1 / 3 times the size W3 of the third protrusion 323 in the first direction X.

[0231] The radius of curvature of the seventeenth chamfer R31 and the radius of curvature of the nineteenth chamfer R33 can be the same or different, and preferably the radius of curvature of the seventeenth chamfer R31 and the radius of curvature of the nineteenth chamfer R33 are the same.

[0232] For example, the size W3 of the third protrusion 323 in the first direction X is 18 millimeters, and the radius of curvature of the seventeenth chamfer R31 can be 1 millimeter, 2 millimeters, 3 millimeters, 4 millimeters, 5 millimeters, or 6 millimeters, etc. The radius of curvature of the nineteenth chamfer R33 can be 1 millimeter, 2 millimeters, 3 millimeters, 4 millimeters, 5 millimeters, or 6 millimeters, etc. The accuracy of the radius of curvature can be accurate to two decimal places.

[0233] In the present embodiment, by limiting the radius of curvature of the seventeenth chamfer R31 and the nineteenth chamfer R33 of the third protrusion 323, the shear effect of the electrode body 232 caused by the large interface gap when the two ends of the third protrusion 323 in the first direction are in contact with the electrode body 232 can be avoided, the safety of the electrode body 232 is protected, and the area of the first face 33 of the third protrusion 323 can be ensured, reducing the risk of the third protrusion 323 causing the electrode body 232 to be deformed, bruised, and decarburized.

[0234] In some embodiments of the present application, the radius of curvature of the eighteenth chamfer R32 is greater than or equal to 1 millimeter and less than or equal to 3 millimeters; and / or the radius of curvature of the twentieth chamfer R34 is greater than or equal to 1 millimeter and less than or equal to 3 millimeters.

[0235] The radius of curvature of the eighteenth chamfer R32 and the radius of curvature of the twentieth chamfer R34 can be the same or different, and preferably the radius of curvature of the eighteenth chamfer R32 and the radius of curvature of the twentieth chamfer R34 are the same.

[0236] For example, the radius of curvature of the eighteenth chamfer R32 can be 1 millimeter, 1.5 millimeters, 2 millimeters, 2.5 millimeters, 3 millimeters, etc. The radius of curvature of the twentieth chamfer R34 can be 1 millimeter, 1.5 millimeters, 2 millimeters, 2.5 millimeters, 3 millimeters, etc. The accuracy of the radius of curvature can be accurate to two decimal places.

[0237] In the embodiment, the curvature radius of the eighteenth fillet R32 and the twentieth fillet R34 of the third boss 323 is limited, which can avoid the shear effect of the electrode body 232 caused by the too large interface gap when the two ends of the third boss 323 in the second direction are in contact with the electrode body 232, thereby protecting the safety of the electrode body 232, and at the same time, the area of the first face 33 of the third boss 323 can be increased, thereby reducing the risk of deformation, bruising, decarburization and the like of the electrode body 232 caused by the contact between the third boss 323 and the electrode body 232.

[0238] It should be further noted that the central angle corresponding to the seventeenth fillet R31, the eighteenth fillet R32, the nineteenth fillet R33 and the twentieth fillet R34 can be approximately 90 degrees, that is, approximately 1 / 4 of a circular arc. In the embodiment, the value of the central angle corresponding to the seventeenth fillet R31, the eighteenth fillet R32, the nineteenth fillet R33 and the twentieth fillet R34 can be 80 degrees to 100 degrees, for example, 80 degrees, 85 degrees, 88 degrees, 89 degrees, 90 degrees, 91 degrees, 92 degrees, 95 degrees, 100 degrees, etc. It can be understood that the central angle corresponding to the seventeenth fillet R31, the eighteenth fillet R32, the nineteenth fillet R33 and the twentieth fillet R34 can be approximately 90 degrees, which can make a smooth transition between the ninth side face 3231, the tenth side face 3232, the eleventh side face 3233, the twelfth side face 3234 and the first face 33.

[0239] In some embodiments of the present application, the curvature radius of the twenty-first fillet R35 is greater than or equal to 4 mm and less than or equal to 8 mm; and / or the curvature radius of the twenty-fourth fillet R38 is greater than or equal to 4 mm and less than or equal to 8 mm.

[0240] The curvature radius of the twenty-first fillet R35 and the curvature radius of the twenty-fourth fillet R38 can be the same or different, and preferably, the curvature radius of the twenty-first fillet R35 and the curvature radius of the twenty-fourth fillet R38 are the same.

[0241] For example, the curvature radius of the twenty-first fillet R35 can be 4 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5 mm, 6 mm, 7 mm or 8 mm, etc. The curvature radius of the twenty-fourth fillet R38 can be 4 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5 mm, 6 mm, 7 mm or 8 mm, etc. The accuracy of the curvature radius can be accurate to two decimal places.

[0242] In the embodiment, the radius of curvature of the twenty-first fillet R35 and the twenty-fourth fillet R38 is limited, which can avoid the third boss 323 from being engaged with the shell 22 during assembly, and can ensure the area of the ninth side surface 3231, the tenth side surface 3232 and the twelfth side surface 3234, thereby reducing the risk of damage to the electrode body 232 caused by the ninth side surface 3231, the tenth side surface 3232 and the twelfth side surface 3234.

[0243] In some embodiments of the present application, the radius of curvature of the twenty-second fillet R36 is greater than or equal to 1 mm and less than or equal to 4 mm, and / or the radius of curvature of the twenty-third fillet R37 is greater than or equal to 1 mm and less than or equal to 4 mm.

[0244] The radius of curvature of the twenty-second fillet R36 and the twenty-third fillet R37 can be the same or different, and preferably, the radius of curvature of the twenty-second fillet R36 and the twenty-third fillet R37 is the same.

[0245] The radius of curvature of the twenty-first fillet R35 can be 1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm or 8 mm, etc. The radius of curvature of the twenty-fourth fillet R38 can be 1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm or 8 mm. The accuracy of the radius of curvature can be accurate to two decimal places.

[0246] In the embodiment, the radius of curvature of the twenty-second fillet R36 and the twenty-third fillet R37 is limited, and the radius of curvature of the twenty-second fillet R36 and the twenty-third fillet R37 is greater than or equal to 1 mm, which can significantly distinguish the third boss 323 from the fillet (0.2 mm) of the mold, can smoothly transition, reduce the effect of shearing, facilitate the demolding of the third boss 323, and on the other hand, the radius of curvature of the twenty-second fillet R36 and the twenty-third fillet R37 is less than or equal to 4 mm, which can ensure the contact area of the first surface 33 on the third boss 323 while avoiding the straight edges of the tenth side surface 3232, the eleventh side surface 3233 and the twelfth side surface 3234 being too small to become sharp edges and causing damage to the electrode body 232.

[0247] In some embodiments of the present application, please refer to Figure 3 and Figure 5 The battery monomer 20 further comprises an insulating film 25, the insulating film 25 is provided with an opening, the electrode assembly 23 is arranged in the insulating film 25, the boss 32 comprises a plurality of side surfaces, the side surfaces are connected between the body part 31 and the first surface 33, and at least one side surface of the plurality of side surfaces is connected with the insulating film 25.

[0248] The insulating film 25 is a member that is substantially or not electrically conductive in the normal use environment of the battery device 100, and can isolate the electrode assembly 23 from the case 22 to reduce the possibility of the electrode assembly 23 and the case 22 forming an electrically conductive loop. The insulating film 25 can be a polyester film resistant to electrolyte corrosion or the like. The insulating film 25 is connected to the insulating member 30 to form a protective barrier that insulates and separates the electrode assembly 23 from the case 22. The insulating film 25 can be a cylindrical film structure with one end open, and the method of assembling the insulating film 25 can be to invert the electrode assembly 23 on the insulating member 30, then to fit the insulating film 25 over the outside of the electrode assembly 23 from the open end, and to connect and secure the open end of the insulating film 25 to the side surface of the boss 32.

[0249] Specifically, the insulating film 25 can be welded to the first side surface 3211, the second side surface 3212, and the fourth side surface 3214 of the first boss 321, the sixth side surface 3222 and the eighth side surface 3224 of the second boss 322, and the ninth side surface 3231, the tenth side surface 3232, and the twelfth side surface 3234 of the third boss 323, respectively.

[0250] In this embodiment, the boss 32 is connected to the insulating film 25 by the side surface, so the side ribs in the insulating member 30 can be omitted, which can ensure the connection strength of the insulating member 30 and the insulating film 25, and can avoid the first surface 33 being pressed by the side ribs inserted into the electrode body 232 of the electrode assembly 23, thereby reducing the risk of the electrode body 232 being decarburized and powdering.

[0251] In some embodiments of the present application, as shown in Figure 3 and Figure 4 The battery cell 20 includes the positive electrode tab 2311 and the negative electrode tab 2312 arranged on the electrode body 232, and the positive electrode tab 2311 and the negative electrode tab 2312 are arranged at intervals along the first direction X. Along the first direction X, the size W5 of the one with the largest size among the positive electrode tab 2311 and the negative electrode tab 2312 is greater than or equal to 50 mm and less than or equal to 70 mm, and the interval distance W6 between the center of the positive electrode tab 2311 and the center of the negative electrode tab 2312 is greater than or equal to 82 mm and less than or equal to 220 mm.

[0252] The mounting holes 311 for the electrode terminals 211 are arranged on the insulating member 30 at positions corresponding to the positive electrode tab 2311 and the negative electrode tab 2312. The mounting holes 311 can be formed on the body portion 31, or in other words, the body portion 31 includes the mounting holes 311, and along the first direction X, the mounting holes 311 can be arranged between the first boss 321 and the second boss 322, and between the second boss 322 and the third boss 323.

[0253] For example, in an embodiment, the dimension W of the body portion 31 along the first direction X can be 270 mm, and the dimensions W5 of the positive and negative tabs 2311 and 2312 along the first direction X can be the same, and can be specifically 50 mm, 51 mm, 52 mm, 55 mm, 60 mm, 65 mm, or 70 mm, etc. The spacing distance W6 between the center of the positive tab 2311 and the center of the negative tab 2312 can be 82 mm, 85 mm, 90 mm, 100 mm, 120 mm, 150 mm, 200 mm, 220 mm, etc. When the specific design value is determined, each dimension can be accurate to two decimal places.

[0254] In the embodiment, by limiting the dimensions of the positive and negative tabs 2311 and 2312 along the first direction X, the support area of the boss 32 for the electrode body 232 can be increased, and the pressure intensity of the electrode body 232 acting on the boss 32 when the large-size battery monomer 20 is inverted can be reduced, thereby reducing the possibility of the electrode body 232 being crushed.

[0255] In some embodiments of the present application, the rated capacity of the battery monomer 20 is greater than 400 Ah.

[0256] The capacity of the battery monomer 20 can be obtained by testing in the following manner:

[0257] At 25℃, the battery monomer 20 is placed for 5 min, and then discharged at 0.33C constant current to the lower limit cutoff voltage; after being placed for 5 min, charged at 0.33C constant current to the upper limit cutoff voltage, and then charged at constant voltage at the upper limit cutoff voltage to a current of 0.05C; after being placed for 5 min, discharged at 0.33C constant current to the lower limit cutoff voltage, and the discharge capacity at this time is recorded, which is the capacity of the battery monomer 20.

[0258] The upper limit cutoff voltage and the lower limit cutoff voltage can be the charging and discharging voltages recommended in the product specification of the battery monomer 20. For example, when the positive active material includes lithium iron phosphate and the negative active material includes graphite, the upper limit cutoff voltage of the battery monomer 20 can be 3.65V, and the lower limit cutoff voltage can be 2.5V.

[0259] In the embodiment, by limiting the rated capacity of the battery monomer 20, the endurance of the battery monomer 20 is improved.

[0260] Please refer to Figure 3In some embodiments of the present application, the size W21 of the shell 22 in the first direction is greater than or equal to 80 mm and less than or equal to 300 mm; the size L21 of the shell 22 in the second direction is greater than or equal to 68 mm and less than or equal to 100 mm; the size H21 of the shell 22 in the third direction is greater than or equal to 205 mm and less than or equal to 250 mm; the first direction, the second direction and the third direction intersect with each other.

[0261] It should be noted that the first direction X can be the length direction of the shell 22, in the battery cell 20 in the form of a square shell, the first direction X can correspond to the width direction of the battery cell 20; the second direction Y can be the width direction of the shell 22, in the battery cell 20 in the form of a square shell, the second direction Y can correspond to the thickness direction of the battery cell 20; the third direction Z can be the height direction of the shell 22, in the battery cell 20 in the form of a square shell, the third direction Z can correspond to the height direction of the battery cell 20.

[0262] The size W21 of the shell 22 in the first direction can be 80 mm, 85 mm, 90 mm, 100 mm, 150 mm, 200 mm, 260 mm or 300 mm, etc. The size L21 of the shell 22 in the second direction can be 68 mm, 70 mm, 72 mm, 75 mm, 80 mm, 85 mm, 90 mm, 100 mm, etc. The size H21 of the shell 22 in the third direction can be 205 mm, 207 mm, 210 mm, 215 mm, 220 mm, 230 mm, 240 mm, 250 mm, etc.

[0263] In the present embodiment, by limiting the size of the shell 22 in the first direction, the second direction and the third direction, the shell 22 can be adapted to a large size battery cell 20.

[0264] Please refer to Figure 2 and Figure 3 The present application also provides a battery device 100, which comprises a box 10 and the battery cell 20 provided by the present application or any of the embodiments of the present application, and the battery cell 20 is arranged in the box 10.

[0265] The battery cell 20 in the battery device 100 can be one or more.

[0266] The battery device 100 of the present embodiment has the same beneficial effects as the battery cell 20 provided by the present application or any of the embodiments of the present application.

[0267] The present application also provides a power consuming device, which comprises the battery device 100 provided by the present application or any of the embodiments of the present application, and the battery device 100 is used to provide power for the power consuming device.

[0268] The electric device can be any of the above-mentioned electric system or electric device.

[0269] The electric device of the embodiment has the same beneficial effects as the battery cell 20 of the present application or any of the embodiments of the present application.

[0270] The present application also provides an energy storage device, which comprises the battery cell 20 of the present application or the battery device 100 of any of the embodiments of the present application.

[0271] The energy storage device of the embodiment has the same beneficial effects as the battery cell 20 of the present application or any of the embodiments of the present application.

[0272] The above description of the various embodiments tends to emphasize the differences between the various embodiments, and the same or similar parts can be referred to each other, and for brevity, will not be repeated here.

[0273] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing having a receiving cavity; an end cover, the end cover sealing the accommodating cavity; an electrode terminal, disposed on the end cap; an electrode assembly disposed in the housing, the electrode assembly comprising a tab and an electrode body, the tab protruding from the electrode body toward the end cap, the tab being electrically connected to the electrode terminal; and An insulating member is arranged between the end cover and the electrode body, the insulating member includes a main body and a boss, the boss protrudes toward the electrode body relative to the main body, the boss includes a first surface facing the electrode body, the total area of ​​the first surface is greater than or equal to 1 / a times the weight of the electrode body, wherein a is greater than or equal to 0.008 and less than or equal to 0.026, the unit of the total area is square millimeter, the unit of the weight is Newton, and the unit of a is MPa.

2. The battery cell according to claim 1, wherein: When the weight is greater than or equal to 49 Newtons and less than or equal to 117.6 Newtons, the total area of ​​the first surface is greater than or equal to 2800 square millimeters and less than or equal to 7000 square millimeters.

3. The battery cell according to claim 1 or 2, characterized in that: There is at least one boss, each of which includes the first surface, and the first surfaces of the bosses are symmetrically arranged about a midline of the length of the main body.

4. The battery cell according to claim 1 or 2, characterized in that: The boss includes a first boss, a second boss and a third boss. Along the first direction, the first boss, the second boss and the third boss are arranged in sequence. The electrode tab includes a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab are respectively arranged between two adjacent bosses. The first direction is the length direction of the main body.

5. The battery cell according to claim 4, characterized in that Along the first direction, a ratio of a sum of a size of the first boss, a size of the second boss, and a size of the third boss to a size of the main body is greater than or equal to 1 / 5 and less than or equal to 2 / 5.

6. The battery cell according to claim 4, characterized in that Along the first direction, the ratio of the size of the first boss to the size of the main body is greater than or equal to 3 / 50 and less than or equal to 1 / 6; and / or Along the first direction, the ratio of the size of the second boss to the size of the main body is greater than 0 and less than or equal to 7 / 25; and / or Along the first direction, a ratio of a size of the third boss to a size of the main body is greater than or equal to 3 / 50 and less than or equal to 1 / 6.

7. The battery cell according to any one of claims 4 to 6, characterized in that: Along the first direction, the size of the main body is greater than or equal to 160 mm and less than or equal to 310 mm; and / or Along the first direction, the sizes of the first boss, the second boss, and the third boss are all greater than or equal to 16 mm, and the sum of the sizes of the first boss, the second boss, and the third boss is less than or equal to 124 mm.

8. The battery cell according to any one of claims 4 to 7, characterized in that: Along the second direction, the size of the first boss, the size of the second boss, and the size of the third boss are all equal to the size of the main body, and the second direction is the width direction of the main body.

9. The battery cell according to claim 8, characterized in that Along the second direction, a size of the main body is greater than or equal to 68 mm and less than or equal to 100 mm.

10. The battery cell according to claim 9, characterized in that Along the second direction, a size of the main body is greater than or equal to 70 mm and less than or equal to 75 mm.

11. The battery cell according to claim 4, characterized in that The first boss includes a first side surface, a second side surface, a third side surface, and a fourth side surface, and is provided with a first chamfered corner, a second chamfered corner, a third chamfered corner, and a fourth chamfered corner. Along the first direction, the first side surface and the third side surface are located at both ends of the first boss. Along the second direction, the second side surface and the fourth side surface are located at both ends of the first boss. The first chamfered corner is formed between the first side surface and the first surface, the second chamfered corner is formed between the second side surface and the first surface, the third chamfered corner is formed between the third side surface and the first surface, and the fourth chamfered corner is formed between the fourth side surface and the first surface. The second direction is the width direction of the main body.

12. The battery cell according to claim 11, characterized in that The first boss is further provided with a fifth rounded corner, a sixth rounded corner, a seventh rounded corner and an eighth rounded corner; The fifth rounded corner is formed between the first side surface and the second side surface; The sixth rounded corner is formed between the second side surface and the third side surface; The seventh rounded corner is formed between the third side surface and the fourth side surface; The eighth rounded corner is formed between the first side surface and the fourth side surface.

13. The battery cell according to claim 12, characterized in that: The curvature radius of the first fillet is greater than or equal to 1 mm and less than or equal to 1 / 3 of the size of the first boss in the first direction; and / or The curvature radius of the third chamfered corner has a value range greater than or equal to 1 mm and less than or equal to 1 / 3 of the size of the first boss in the first direction.

14. The battery cell according to claim 11 or 13, characterized in that: The curvature radius of the second fillet is in the range of greater than or equal to 1 mm and less than or equal to 3 mm; and / or The curvature radius of the fourth fillet has a value range of greater than or equal to 1 mm and less than or equal to 3 mm.

15. The battery cell according to claim 12, characterized in that The fifth chamfered corner and the eighth chamfered corner are both arc-shaped chamfers; The curvature radius of the fifth rounded corner has a value range of greater than or equal to 4 mm and less than or equal to 8 mm; and / or The curvature radius of the eighth rounded corner has a value range of greater than or equal to 4 mm and less than or equal to 8 mm.

16. The battery cell according to claim 12 or 15, characterized in that: The curvature radius of the sixth rounded corner has a value range greater than or equal to 1 mm and less than or equal to 4 mm; and / or The curvature radius of the seventh chamfered corner has a value range of greater than or equal to 1 mm and less than or equal to 4 mm.

17. The battery cell according to claim 4, characterized in that The second boss includes a fifth side surface, a sixth side surface, a seventh side surface, and an eighth side surface, and is provided with a ninth chamfered corner, a tenth chamfered corner, an eleventh chamfered corner, and a twelfth chamfered corner. Along the first direction, the fifth side surface and the seventh side surface are located at two ends of the first boss. Along the second direction, the sixth side surface and the eighth side surface are located at two ends of the second boss. The ninth chamfered corner is formed between the fifth side surface and the first surface, the tenth chamfered corner is formed between the sixth side surface and the first surface, the eleventh chamfered corner is formed between the seventh side surface and the first surface, and the twelfth chamfered corner is formed between the eighth side surface and the first surface. The second direction is the width direction of the main body.

18. The battery cell according to claim 17, characterized in that The second boss is further provided with a thirteenth rounded corner, a fourteenth rounded corner, a fifteenth rounded corner and a sixteenth rounded corner; The thirteenth rounded corner is formed between the fifth side surface and the sixth side surface; The fourteenth rounded corner is formed between the sixth side surface and the seventh side surface; The fifteenth rounded corner is formed between the seventh side surface and the eighth side surface; The sixteenth rounded corner is formed between the fifth side surface and the eighth side surface.

19. The battery cell according to claim 18, characterized in that The curvature radius of the ninth rounded corner is greater than or equal to 1 mm and less than or equal to 1 / 2 times the difference between the size of the second boss and the size of the sixth side surface along the first direction; and / or The curvature radius of the eleventh chamfered corner has a value range greater than or equal to 1 mm and less than or equal to 1 / 2 times the difference between the size of the second boss and the size of the sixth side surface along the first direction.

20. The battery cell according to claim 18 or 19, characterized in that: The curvature radius of the tenth rounded corner has a value range of greater than or equal to 1 mm and less than or equal to 3 mm; and / or The curvature radius of the twelfth fillet has a value range of greater than or equal to 1 mm and less than or equal to 3 mm.

21. The battery cell according to claim 20, characterized in that The curvature radius of the thirteenth rounded corner has a value range of greater than or equal to 1 mm and less than or equal to 8 mm; and / or The curvature radius of the fourteenth rounded corner has a value range of greater than or equal to 1 mm and less than or equal to 8 mm; and / or The curvature radius of the fifteenth rounded corner has a value range of greater than or equal to 1 mm and less than or equal to 8 mm; and / or The curvature radius of the sixteenth rounded corner has a value range of greater than or equal to 1 mm and less than or equal to 8 mm.

22. The battery cell according to claim 4, characterized in that The end cover is further provided with a pressure relief mechanism, the second boss is provided with a receiving groove facing the pressure relief mechanism, the receiving groove includes a first inner side surface and a second inner side surface, and along the first direction, the second inner side surface and the second inner side surface are arranged opposite to each other; The angle formed by the first inner side surface and the main body is greater than 0 and less than or equal to 90 degrees; and / or An angle formed by the second inner side surface and the main body is greater than 0 and less than or equal to 90 degrees.

23. The battery cell according to claim 4, characterized in that The third boss includes a ninth side surface, a tenth side surface, an eleventh side surface, and a twelfth side surface, and is provided with a seventeenth chamfered corner, an eighteenth chamfered corner, a nineteenth chamfered corner, and a twentieth chamfered corner. Along the first direction, the ninth side surface and the eleventh side surface are located at two ends of the third boss. Along the second direction, the tenth side surface and the twelfth side surface are located at two ends of the third boss. The seventeenth chamfered corner is formed between the ninth side surface and the first surface, the eighteenth chamfered corner is formed between the tenth side surface and the first surface, the nineteenth chamfered corner is formed between the eleventh side surface and the first surface, and the twentieth chamfered corner is formed between the twelfth side surface and the first surface. The second direction is the width direction of the main body.

24. The battery cell according to claim 23, characterized in that The third boss is further provided with a twenty-first rounded corner, a twenty-second rounded corner, a twenty-third rounded corner, and a twenty-fourth rounded corner; A twenty-first rounded corner is formed between the ninth side surface and the tenth side surface; A twenty-second rounded corner is formed between the tenth side surface and the eleventh side surface; A twenty-third rounded corner is formed between the eleventh side surface and the twelfth side surface; A twenty-fourth rounded corner is formed between the ninth side surface and the twelfth side surface.

25. The battery cell according to claim 24, characterized in that The curvature radius of the seventeenth rounded corner is greater than or equal to 1 mm and less than or equal to 1 / 3 of the size of the third boss in the first direction; and / or The curvature radius of the nineteenth rounded corner has a value range greater than or equal to 1 mm and less than or equal to 1 / 3 of the size of the third boss in the first direction.

26. The battery cell according to claim 23 or 25, characterized in that: The eighteenth chamfered corner and the twentieth chamfered corner are arc-shaped chamfers; The curvature radius of the eighteenth rounded corner has a value range of greater than or equal to 1 mm and less than or equal to 3 mm; and / or The curvature radius of the twentieth rounded corner has a value range of greater than or equal to 1 mm and less than or equal to 3 mm.

27. The battery cell according to claim 24, characterized in that The twenty-first chamfered corner and the twenty-fourth chamfered corner are both arc-shaped chamfers; The curvature radius of the twenty-first rounded corner is in a range greater than or equal to 4 mm and less than or equal to 8 mm; and / or The curvature radius of the twenty-fourth rounded corner has a value range of greater than or equal to 4 mm and less than or equal to 8 mm.

28. The battery cell according to claim 24 or 27, characterized in that: The twenty-second chamfered corner and the twenty-third chamfered corner are both arc-shaped chamfers; The curvature radius of the twenty-second rounded corner has a value range of greater than or equal to 1 mm and less than or equal to 4 mm; and / or The curvature radius of the twenty-third rounded corner has a value range of greater than or equal to 1 mm and less than or equal to 4 mm.

29. The battery cell according to any one of claims 1 to 28, characterized in that: The battery cell also includes an insulating film, which is provided with an opening. The electrode assembly is arranged in the insulating film. The boss includes multiple side surfaces, which are connected between the main body and the first surface. At least one of the multiple side surfaces is connected to the insulating film.

30. The battery cell according to claim 4, characterized in that Along the first direction, the largest dimension of the positive electrode tab and the negative electrode tab is greater than or equal to 50 mm and less than or equal to 70 mm, and the spacing distance between the center of the positive electrode tab and the center of the negative electrode tab is greater than or equal to 82 mm and less than or equal to 220 mm.

31. The battery cell according to any one of claims 1 to 30, characterized in that: The capacity of the battery cell is greater than 400 Ah.

32. The battery cell according to any one of claims 1 to 31, characterized in that: The size of the housing in the first direction is greater than or equal to 80 mm and less than or equal to 300 mm; The dimension of the housing in the second direction is greater than or equal to 68 mm and less than or equal to 100 mm; The dimension of the housing in the third direction is greater than or equal to 205 mm and less than or equal to 250 mm; The first direction, the second direction, and the third direction intersect with each other.

33. A battery device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 32.

34. An electrical device, characterized in that: Comprising the battery device according to claim 33 or the battery cell according to any one of claims 1-32.

35. An energy storage device, characterized in that: Comprising the battery device according to claim 33 or the battery cell according to any one of claims 1-32.

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