Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. Each single battery comprises an end cover, an anti-explosion valve, an electrode assembly and a first insulating part, the anti-explosion valve is mounted on the end cover, the electrode assembly is arranged on one side, arranged in the thickness direction, of the end cover, and the first insulating part is located between the end cover and the electrode assembly; the first insulating part is partially sunken to form a boss protruding towards the electrode assembly, the orthographic projection of the boss in the thickness direction of the end cover completely covers the anti-explosion valve, and an exhaust hole is formed in the boss; wherein the boss comprises a first convex part and a second convex part, the second convex part protrudes out of the first convex part and abuts against the electrode assembly, in the length direction of the end cover, the size of the first convex part is B, the size of the second convex part is C, C is smaller than B, and the two opposite end faces of the second convex part are located between the two opposite end faces of the first convex part. According to the battery monomer, the battery and the power utilization device provided by the invention, the structural design of the battery monomer with a small size can be met.

Description

TECHNICAL FIELD

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

[0002] In recent years, the new energy industry has been getting more and more attention. As an important part of the new energy industry, batteries account for a large share in the market. A battery is formed by a plurality of battery monomers in series, parallel or mixed connection.

[0003] When designing the end cover of a battery monomer, a protruding mesh is generally designed on the insulating part on the side of the end cover facing the electrode assembly. The mesh corresponds to the position of the explosion-proof valve and is used to abut against the electrode assembly to prevent the electrode assembly from shifting and moving, thereby improving the stability of the electrode assembly in the battery.

[0004] In some small-sized battery monomers, the length of the end cover is small. After the design and arrangement of the remaining main components are completed, there is little space left for the design of the mesh, which is insufficient to completely cover the explosion-proof valve. If the mesh is designed according to the conventional scheme, there is insufficient space left for the design and arrangement of the remaining main components. CONTENT OF THE UTILITY MODEL

[0005] Therefore, it is necessary to provide a battery monomer, a battery and an electric device that can meet the installation and design of the mesh and the remaining main components in a small-sized battery monomer.

[0006] In one aspect, a battery monomer includes an end cover, an explosion-proof valve, an electrode assembly and a first insulating part. The explosion-proof valve is installed on the end cover. The electrode assembly is arranged on one side of the end cover along the thickness direction thereof. The first insulating part is located between the end cover and the electrode assembly.

[0007] The first insulating part is partially recessed to form a boss protruding towards the electrode assembly. The normal projection of the boss in the thickness direction of the end cover completely covers the explosion-proof valve. An exhaust hole is formed in the boss.

[0008] The boss includes a first protruding part and a second protruding part. The second protruding part protrudes from the first protruding part and abuts against the electrode assembly. In the length direction of the end cover, the size of the first protruding part is B, the size of the second protruding part is C, C < B, and the opposite end faces of the second protruding part are located between the opposite end faces of the first protruding part.

[0009] In some embodiments, a first groove is formed on the side of the first protruding part away from the electrode assembly. The minimum distance between the groove bottom wall of the first groove and the explosion-proof valve in the thickness direction of the end cover is A, and A is greater than or equal to 0.2 mm.

[0010] In some embodiments, the battery cell further comprises a second insulation member foldably connected to two ends of the first insulation member arranged along the length direction of the end cover, and the second insulation member is located on the side of the first insulation member facing the electrode assembly;

[0011] Along the length direction of the end cover, and on both sides of the second protrusion, the first protrusion forms two oppositely arranged mounting areas, and each of the mounting areas is mounted with any one of a clamping protrusion and a clamping groove, and the other one of the clamping protrusion and the clamping groove is correspondingly arranged on the second insulation member, and the two are clamped and matched.

[0012] In some embodiments, the first protrusion has a first surface facing the electrode assembly, and the first surface at least partially forms the mounting area, and the second protrusion has a second surface facing the electrode assembly;

[0013] The first insulation member is provided with a clamping protrusion, and the clamping protrusion of the first insulation member and the second insulation member are located between the first surface and the second surface, and the second protrusion directly abuts against the electrode assembly; or,

[0014] The clamping protrusion on the first insulation member and the second insulation member both protrude from the second surface in the direction facing the electrode assembly, and the second protrusion indirectly abuts against the electrode assembly through the second insulation member.

[0015] In some embodiments, the battery cell further comprises an adapter, and the adapter corresponds to the mounting area one by one, the adapter is partially located in the mounting area corresponding thereto, and the adapter is provided with a notch, and the clamping protrusion on the first insulation member is arranged in the notch on the adapter installed in the same mounting area.

[0016] In some embodiments, 1

[0017] In some embodiments, the size of the second protrusion in the width direction of the end cover is E;

[0018] The explosion-proof valve has an explosion-proof area, and the explosion-proof area is circular; the diameter of the explosion-proof area is D, and D

[0019] In some embodiments, the explosion-proof valve has an explosion-proof area, and the area of the explosion-proof area is M, and the area of the normal projection of the boss in the thickness direction of the end cover is N, and N

[0020] In some embodiments, a first groove is formed on the side of the first protrusion facing away from the electrode assembly, and a second groove is formed on the side of the second protrusion facing away from the electrode assembly. Both the first protrusion and the second protrusion are provided with vent holes. The vent hole on the first protrusion communicates with the first groove, and the vent hole on the second protrusion communicates with the second groove.

[0021] On the other hand, this application also provides a battery comprising a battery cell as described in any of the above embodiments.

[0022] In addition, this application also provides an electrical device that includes a battery as described in any of the above embodiments, or includes a battery cell as described in any of the above embodiments.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] The aforementioned battery cell, battery, and electrical device are designed so that the projection of the boss onto the thickness of the end cap completely covers the explosion-proof valve. When the second protrusion of the boss abuts against the electrode assembly, the interaction of forces prevents the boss from easily deforming and compressing the explosion-proof valve, even if the electrode assembly squeezes the boss, resulting in high installation reliability. Furthermore, along the length of the end cap, the dimensions of the first protrusion are B and the second protrusion are C, where C < B. The opposite end faces of the second protrusion are located between the opposite end faces of the first protrusion. Therefore, along the length of the end cap and on both sides of the second protrusion, more design space can be provided for the installation of other main components, while also allowing for avoidance of these components. This allows for the design of the boss and other main components within a relatively small battery cell, solving the problem of insufficient internal design space and improving the battery's space utilization. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a single battery cell in one embodiment of this application;

[0026] Figure 2 for Figure 1 The diagram shows the structure of a single battery cell after the casing has been removed.

[0027] Figure 3 for Figure 2 The top view of the battery cell after removing the electrode assembly and adapter;

[0028] Figure 4 for Figure 3 The cross-sectional view of the battery cell along the SS direction is shown.

[0029] Figure 5 for Figure 4An enlarged schematic view of the local structure T in the battery cell shown;

[0030] Figure 6 For Figure 1 A top view of the cooperation of the first insulating member, the second insulating member, the end cover and the adapter in the battery cell shown;

[0031] Figure 7 For Figure 6 An inverted view of the battery cell shown;

[0032] Figure 8 For Figure 7 A schematic view of the battery cell shown with the second insulating member removed;

[0033] Figure 9 For Figure 8 A schematic view of the first insulating member shown;

[0034] Figure 10 For Figure 6 A top view of the first insulating member shown;

[0035] Figure 11 For Figure 3 A schematic view of the cooperation of the explosion-proof valve and the first insulating member in the battery cell shown;

[0036] Figure 12 For Figure 6 A schematic view of the cooperation of the first insulating member and the second insulating member before the second insulating member is folded relative to the first insulating member shown;

[0037] Figure 13 A schematic view of the first insulating member in another embodiment of the present application;

[0038] Figure 14 For Figure 13 An inverted view of the first insulating member shown;

[0039] Figure 15 A schematic view of the cooperation of the normal projection of the boss in the thickness direction of the end cover and the explosion-proof area.

[0040] Reference signs:

[0041] 100, battery cell;

[0042] 10, first insulating member; 20, end cover; 30, explosion-proof valve; 40, electrode assembly; 50, adapter; 60, shell; 70, second insulating member; 80, pole;

[0043] 11, boss; 111, first protrusion; 1111, first groove; 1112, first surface; 1113, mounting area; 112, second protrusion; 1121, second groove; 1122, second surface; 113, exhaust hole; 114, clamping protrusion; 21, assembly hole; 31, anti-explosion area; 32, assembly area; 51, pole post welding portion; 52, tab welding portion; 53, notch; 71, clamping groove;

[0044] X, length direction; Y, width direction; Z, thickness direction. DETAILED DESCRIPTION

[0045] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details, and that the present application is not limited to the specific embodiments disclosed below.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0048] In the present application, unless specifically defined otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like should be construed broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0050] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a mediating element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a mediating element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0051] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0052] The battery includes a plurality of battery monomers, and the plurality of battery monomers are connected by series connection, parallel connection or mixed connection and the like. Among them, the battery monomer is a cylindrical battery monomer, a square battery monomer and the like.

[0053] When designing the end cover of a battery monomer, a protruding mesh is usually designed on the insulating part on the side of the end cover facing the electrode assembly, which corresponds to the position of the explosion-proof valve and is used to abut against the electrode assembly to prevent the electrode assembly from shifting and moving, thereby improving the stability of the electrode assembly in the battery. In some smaller battery monomers, the length of the end cover is small, and after the design and arrangement of the remaining main parts are completed, there is little space left for the design of the mesh, which is not enough to completely cover the explosion-proof valve. If the mesh is designed according to the conventional scheme, there will be insufficient space for the design and arrangement of the remaining main parts.

[0054] Please refer to Figures 1 to 8 To alleviate the above problems, the present application provides a battery monomer 100, which comprises an end cover 20, a shell 60, an explosion-proof valve 30, an electrode assembly 40 and a first insulating part 10. The explosion-proof valve 30 is installed on the end cover 20, the electrode assembly 40 is arranged on one side of the end cover 20 along the thickness direction Z, and the first insulating part 10 is located between the end cover 20 and the electrode assembly 40. The first insulating part 10 is partially recessed to form a boss 11 protruding towards the electrode assembly 40. The boss 11 completely covers the explosion-proof valve 30 in the thickness direction Z of the end cover 20, and a gas exhaust hole 113 is formed in the boss 11. The boss 11 comprises a first protruding part 111 and a second protruding part 112. The second protruding part 112 protrudes from the first protruding part 111 and abuts against the electrode assembly 40. In the length direction X of the end cover 20, the size B of the first protruding part 111 and the size C of the second protruding part 112 satisfy C < B, and the opposite end faces of the second protruding part 112 are located between the opposite end faces of the first protruding part 111.

[0055] The shell 60 has a structure with one open end and one closed end, or both ends open. The end cover 20 covers the open end of the shell 60 and forms a containing space of the battery monomer 100 together with the shell 60. The electrode assembly 40 and the first insulating part 10 are arranged in the containing space and are isolated from the external environment. The explosion-proof valve 30 is installed on the end cover 20 and is arranged towards the external environment.

[0056] The first insulating part 10 is partially recessed to form a boss 11 protruding towards the electrode assembly 40. A gas exhaust hole 113 is formed in the boss 11. During thermal runaway, high-temperature flue gas can be discharged to the external environment through the gas exhaust hole 113 and the explosion-proof valve 30, so as to avoid the accumulation of high-temperature flue gas in the battery monomer 100 and cause explosion.

[0057] The boss 11 is used to abut against the electrode assembly 40 to prevent the electrode assembly 40 from shifting in the thickness direction Z of the end cover 20, thereby improving the installation stability of the electrode assembly 40 inside the battery cell 100. To avoid interference between the boss 11 and the explosion-proof valve 30 and damage to the explosion-proof valve 30, the boss 11 is completely projected on the explosion-proof valve 30 in the thickness direction Z of the end cover 20. This is because: when the boss 11 abuts against the electrode assembly 40, the electrode assembly 40 will squeeze the boss 11 due to the interaction of the force, and if the projection area of the boss 11 does not completely cover the explosion-proof valve 30, the boss 11 will squeeze the explosion-proof valve 30 after being deformed under pressure. It can be understood that the boss 11 in the present application is the above-mentioned mesh.

[0058] Specifically, the boss 11 includes a first protruding portion 111 and a second protruding portion 112, the second protruding portion 112 protrudes from the first protruding portion 111 and abuts against the electrode assembly 40 to prevent the electrode assembly 40 from shifting. The first protruding portion 111 and / or the second protruding portion 112 is provided with an exhaust hole 113.

[0059] As an example, the first protruding portion 111 and the second protruding portion 112 are both rectangular structures.

[0060] As an example, the second protruding portion 112 can be continuously arranged in the length direction X of the end cover 20, or the second protruding portion 112 can include a plurality of sub-protruding portions, and all the sub-protruding portions of the second protruding portion 112 are arranged at intervals in the length direction X of the end cover 20.

[0061] Wherein, in the length direction X of the end cover 20, the size B of the first protruding portion 111, the size C of the second protruding portion 112, C < B, and the opposite two end faces of the second protruding portion 112 are located between the opposite two end faces of the first protruding portion 111. In this case, in some small-sized battery cells 100, although the length of the end cover 20 is small, the second protruding portion 112 can avoid the remaining main components such as the adapter 50 and the tab of the electrode assembly 40 inside the battery cell 100, so that the remaining main components have a larger design space, which meets the purpose of the installation design of the boss 11 and the remaining main components in the small-sized battery cell 100.

[0062] For example, the remaining main components can be the adapter 50, the tab of the electrode assembly 40, and the like.

[0063] It should be noted that for the case where the second protruding portion 112 is a plurality of sub-protruding portions, the size C refers to the distance between the two end faces farthest apart in the length direction X of the first sub-protruding portion and the last sub-protruding portion arranged in the length direction X, and for the case where the second protruding portion 112 is continuously arranged, the size C refers to the distance between the opposite two end faces of the second protruding portion 112 arranged in the length direction X. The size B refers to the distance between the opposite two end faces of the first protruding portion 111 arranged in the length direction X.

[0064] In summary, the battery cell 100 in the present application, by designing the normal projection of the boss 11 on the thickness direction Z of the end cover 20 completely covers the explosion-proof valve 30, when the second protruding part 112 of the boss 11 abuts against the electrode assembly 40, under the influence of the force interaction, even if the electrode assembly 40 extrudes the boss 11, the boss 11 is not easy to extrude and deform and extrude the explosion-proof valve 30, the reliability of installation is high. In addition, in the length direction X of the end cover 20, the size of the first protruding part 111 is B, the size of the second protruding part 112 is C, C < B, and the opposite two end faces of the second protruding part 112 are located between the opposite two end faces of the first protruding part 111, therefore, along the length direction X of the end cover 20, and on both sides of the second protruding part 112, the second protruding part 112 can give more design space to install the remaining main components, and can avoid the remaining main components, thereby realizing the design of the boss 11 and the remaining main components in the battery cell 100 with smaller size, solving the problem of insufficient internal design space of the battery cell 100, and improving the space utilization of the battery.

[0065] Please refer to Figure 2 , Figures 5 to 8 In some embodiments, the side of the first protruding part 111 away from the electrode assembly 40 is formed with a first recess 1111, the side of the second protruding part 112 away from the electrode assembly 40 is formed with a second recess 1121, and the first protruding part 111 and the second protruding part 112 are both provided with exhaust holes 113, the exhaust holes 113 on the first protruding part 111 are in communication with the first recess 1111, and the exhaust holes 113 on the second protruding part 112 are in communication with the second recess 1121.

[0066] The first protruding part 111 and the second protruding part 112 are both provided with exhaust holes 113, the high-temperature flue gas in the battery cell 100 can be discharged to the outside through the exhaust holes 113 on the first protruding part 111, the first recess 1111 and the explosion-proof valve 30, or through the exhaust holes 113 on the second protruding part 112, the second recess 1121 and the explosion-proof valve 30, the discharge path of the high-temperature flue gas is increased, the smoke exhaust efficiency is high, and the safety is improved. Moreover, the first recess 1111 on the first protruding part 111 and the second recess 1121 on the second protruding part 112 can also increase the distance between the first protruding part 111 and the second protruding part 112 and the explosion-proof valve 30, to reduce the risk of deformation of the first protruding part 111 and the second protruding part 112 and extrusion of the explosion-proof valve 30.

[0067] Please refer to Figure 5In some embodiments, the minimum distance between the bottom wall of the first groove 1111 and the explosion-proof valve 30 in the thickness direction Z of the end cover 20 is A, and A≥0.2 mm. Specifically, A is 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, but is not limited to the listed values, and other unlisted values within the value range are also applicable.

[0068] Specifically, the end cover 20 is provided with a mounting hole 21, and the explosion-proof valve 30 is mounted in the mounting hole 21. The explosion-proof valve 30 includes a mounting area 32 and an explosion-proof area 31. The mounting area 32 is clamped with the mounting hole 21, and the mounting area 32 is arranged around the circumferential direction of the explosion-proof area 31.

[0069] The explosion-proof area 31 is a thinned area relative to the mounting area 32. The explosion-proof area 31 has a weak structure such as a notch or a groove, so that the weak structure can be broken when the high-temperature flue gas converges, and pressure relief can be achieved.

[0070] The minimum distance between the bottom wall of the first groove 1111 and the explosion-proof valve 30 in the thickness direction Z of the end cover 20 is A, which is the distance between the bottom wall of the first groove 1111 and the mounting area 32. A≥0.2 mm. By controlling the minimum distance, the first convex portion 111 can be prevented from contacting the explosion-proof valve 30 after being deformed under stress, thereby affecting the performance of the battery monomer 100.

[0071] Please refer to Figure 5 , Figures 7 to 9 , and Figure 13 In some embodiments, the battery monomer 100 further includes a second insulating member 70. The second insulating member 70 is foldably connected to both ends of the first insulating member 10 along the length direction X of the end cover 20, and the second insulating member 70 is located on the side of the first insulating member 10 facing the electrode assembly 40. Along the length direction X of the end cover 20 and on both sides of the second convex portion 112, the first convex portion 111 forms two oppositely arranged mounting areas 1113. Each mounting area 1113 is provided with any one of the clamping convex 114 and the clamping groove 71, and the other one of the clamping convex 114 and the clamping groove 71 is correspondingly provided on the second insulating member 70, and the two are clamped and matched.

[0072] As an example, the clamping convex 114 is arranged in the mounting area 1113, and the clamping groove 71 is arranged on the second insulating member 70, and the clamping convex 114 and the clamping groove 71 are clamped and matched. For convenience of description, the following embodiments are described by taking the clamping convex 114 arranged in the mounting area 1113 and the clamping groove 71 arranged on the second insulating member 70 as an example.

[0073] After the second insulation piece 70 is folded relative to the first insulation piece 10, the distance between the end cover 20 and the electrode assembly 40 is increased, and the insulation effect between the electrode assembly 40 and the end cover 20 is improved. Moreover, the second insulation piece 70 is installed in a snap-fit manner via the clamping slot 71, and the installation is simple and efficient.

[0074] In some embodiments, the first protrusion 111 has a first surface 1112 facing the electrode assembly 40, and the first surface 1112 at least partially forms the mounting area 1113. The second protrusion 112 has a second surface 1122 facing the electrode assembly 40. The first insulation piece 10 is provided with the clamping protrusion 114, and the clamping protrusion 114 of the first insulation piece 10 and the second insulation piece 70 are located between the first surface 1112 and the second surface 1122, and the second protrusion 112 directly abuts against the electrode assembly 40. That is, the second insulation piece 70 and the clamping protrusion 114 are completely within the range of the first protrusion 111 and the second protrusion 112, so that the design space of the battery monomer 100 in the thickness direction Z of the end cover 20 can be further saved, and the space utilization is improved.

[0075] Alternatively, in some embodiments, the clamping protrusion 114 on the first insulation piece 10 and the second insulation piece 70 both protrude in the direction facing the electrode assembly 40 beyond the second surface 1122, and the second protrusion 112 indirectly abuts against the electrode assembly 40 through the second insulation piece 70. In this embodiment, the second protrusion 112 indirectly abuts against the electrode assembly 40 through the second insulation piece 70 to share the pressure of the electrode assembly 40 on the second protrusion 112, further reducing the risk of deformation of the boss 11 and extrusion of the explosion-proof valve 30.

[0076] Please refer to Figure 8 In some embodiments, the battery monomer 100 further comprises an adapter 50, the adapter 50 corresponds to the mounting area 1113 one by one, the adapter 50 is partially located in the mounting area 1113 corresponding thereto, and the adapter 50 is provided with a notch 53, and the clamping protrusion 114 on the first insulation piece 10 passes through the notch 53 on the adapter 50 installed in the same mounting area 1113.

[0077] The adapter 50 includes a pole post welding portion 51 and two tab welding portions 52, and the pole post welding portion 51 and the two tab welding portions 52 jointly define the notch 53. The two tab welding portions 52 correspond to the tabs on the two electrode assemblies 40 one by one. The pole post welding portion 51 is used for welding with the pole post 80, and the tab welding portion 52 is used for welding with the tab of the corresponding electrode assembly 40.

[0078] The adapter 50 is partially located in the mounting area 1113 corresponding thereto, specifically, the two tab welding portions 52 of the adapter 50 are located in the mounting area 1113 corresponding to the adapter 50.

[0079] By setting the card convex 114 between the two lug welding portions 52 and penetrating the notch 53, when the adapter 50 is installed, the visual positioning of the device is facilitated, and the installation error of the adapter 50 is reduced. In addition, when the adapter 50 is installed and welded, the lug welding portion 52 of the adapter 50 is overlapped in the installation area 1113 of the first convex portion 111, so that the adapter 50 can be kept in a horizontal and non-tilted state, avoiding disturbance of the adapter 50 during welding and further affecting the lug shaping and even causing the lug to tear.

[0080] Please refer to Figure 5 and Figure 10 In some embodiments, in the length direction X of the end cover 20, the size of the first convex portion 111 is B, and the size of the second convex portion 112 is C, 1

[0081] If B / C is too large, the second convex portion 112 has a small size in the length direction X of the end cover 20, and the support effect on the electrode assembly 40 is not good. If B / C is too small, the second convex portion 112 occupies a large space in the length direction X of the end cover 20, and the space left for the remaining main components is small. By designing 1

[0082] Please refer to Figure 1 , Figure 5 , Figures 10 to 14 In some embodiments, the size of the first convex portion 111 in the length direction X of the end cover 20 is B, and the size of the second convex portion 112 in the width direction Y of the end cover 20 is E; the explosion-proof valve 30 has an explosion-proof area 31, and the explosion-proof area 31 is circular; the diameter of the explosion-proof area 31 is D, D

[0083] In this design, on the one hand, the size of the first protrusion 111 in the length direction X of the end cover 20 or the size of the second protrusion 112 in the width direction Y of the end cover 20 is not too small, so as to reduce the risk that the first protrusion 111 in the length direction X of the end cover 20 or the second protrusion 112 in the width direction Y of the end cover 20 is too small to contact and press the explosion-proof valve 30. On the other hand, the size of the first protrusion 111 in the length direction X of the end cover 20 and the size of the second protrusion 112 in the width direction Y of the end cover 20 are not too large, so that the clearance of the first protrusion 111 in the length direction X of the end cover 20 or the second protrusion 112 in the width direction Y of the end cover 20 to the explosion-proof valve 30 is not too large, further reducing the risk that the first protrusion 111 and the second protrusion 112 deform to abut the electrode assembly 40. It is worth mentioning that the clearance of the first protrusion 111 in the length direction X of the end cover 20 or the second protrusion 112 in the width direction Y of the end cover 20 is too large, which is easy to cause the boss 11 to deform too much to abut the explosion-proof valve 30. In addition, D < B < 5D, which can also improve the strength of the first protrusion 111 and reduce the deformation risk of the first protrusion 111. D < E < 5D, the second protrusion 112 in the width direction Y of the end cover 20 can meet the effect of supporting the electrode assembly 40.

[0084] It can be understood that the clearance of the first protrusion 111 in the length direction X of the end cover 20 refers to the minimum distance between the first end face of the first protrusion 111 arranged in the length direction X of the end cover 20 and the explosion-proof valve 30 in the thickness direction Z of the end cover 20. The clearance of the second protrusion 112 in the width direction Y of the end cover 20 refers to the minimum distance between the second end face of the second protrusion 112 arranged in the width direction Y of the end cover 20 and the explosion-proof valve 30 in the thickness direction Z of the end cover 20.

[0085] Of course, the explosion-proof area 31 of the explosion-proof valve 30 is not limited to a circular shape, but can also be an elliptical shape, a waist shape, etc. When the explosion-proof area 31 is elliptical, the short axis of the explosion-proof area 31 is defined as D1, D1 < B < 5D1, or D1 < E < 5D1, wherein the extension direction of the short axis is parallel to the width direction Y of the end cover 20; if the explosion-proof area 31 is waist-shaped, the transverse dimension of the explosion-proof area 31 is defined as D2, D2 < B < 5D2, or D2 < E < 5D2, wherein the transverse dimension of the explosion-proof area 31 is the dimension of the explosion-proof area 31 in its transverse direction, which is parallel to the width direction Y of the end cover 20, and the transverse dimension of the explosion-proof area 31 is smaller than the longitudinal dimension, which is parallel to the length direction X of the end cover 20.

[0086] Please refer to Figure 5 , Figure 8 and Figure 15In some embodiments, the explosion-proof valve 30 has an explosion-proof area 31, the area of the explosion-proof area 31 is M, the area of the normal projection of the boss 11 on the thickness direction Z of the end cover 20 is N, and N≤5M. For example, specifically, N is M, 2M, 2.5M or 5M, but is not limited to the listed ratios, and other unlisted ratios within the ratio range are also applicable.

[0087] When the electrode assembly 40 abuts against the second protrusion 112 to cause the boss 11 to be stressed, if the empty area of the boss 11 is too large, the force arm of the first insulating piece 10 will be too large, which will cause the deformation amount of the boss 11 to increase under the same size of force and contact the explosion-proof valve 30, affecting the performance of the explosion-proof valve 30 and reducing the safety of the battery. By setting N≤5M, the empty area of the boss 11 is appropriate, the possibility of the boss 11 being deformed and stressed and contacting the explosion-proof valve 30 is reduced, and the battery is safer to use.

[0088] It can be understood that the empty area of the boss 11 refers to the area of the region formed between the outer contour of the normal projection of the boss 11 on the thickness direction Z of the end cover 20 and the outer contour of the explosion-proof valve 30, as shown in Figure 15 The empty area of the boss 11 is K, and the sum of the area K and the area M is N.

[0089] The application also provides a battery comprising the battery monomer 100 according to any one of the above embodiments. The battery in the application has the effects brought by any one of the above embodiments, and thus will not be described here.

[0090] The application also provides a power consumption device comprising the battery according to the above embodiments, or comprising the battery monomer 100 according to any one of the above embodiments. The power consumption device in the application has the effects brought by any one of the above embodiments, and thus will not be described here.

[0091] The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0092] It should be understood that the technical solutions described in the embodiments of the application are not limited to the above-described power consumption devices.

[0093] The battery cell 100, the battery and the electric device described above, by designing the normal projection of the boss 11 on the thickness direction Z of the end cover 20 to completely cover the explosion-proof valve 30, when the second protruding part 112 of the boss 11 abuts against the electrode assembly 40, under the influence of the force interaction, even if the electrode assembly 40 extrudes the boss 11, the boss 11 is not easy to be extruded and deformed and extrude the explosion-proof valve 30, and the installation reliability is high. In addition, in the length direction X of the end cover 20, the size of the first protruding part 111 is B, the size of the second protruding part 112 is C, C < B, and the opposite two end faces of the second protruding part 112 are located between the opposite two end faces of the first protruding part 111, therefore, along the length direction X of the end cover 20 and on both sides of the second protruding part 112, the second protruding part 112 can give more design space to install the remaining main components, and can avoid the remaining main components, so as to realize the design of the boss 11 and the remaining main components in the battery cell 100 with small size, solve the problem of insufficient internal design space of the battery cell 100, and improve the space utilization of the battery.

[0094] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations are described, but it is understood that the scope of the present disclosure includes all such possible combinations.

[0095] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery cell, characterized by, The battery cell comprises an end cover (20), an explosion-proof valve (30), an electrode assembly (40) and a first insulating piece (10), the explosion-proof valve (30) is installed on the end cover (20), the electrode assembly (40) is arranged on one side of the end cover (20) along the thickness direction (Z) of the end cover (20), and the first insulating piece (10) is located between the end cover (20) and the electrode assembly (40); The first insulating piece (10) is partially recessed to form a boss (11) protruding towards the electrode assembly (40), the normal projection of the boss (11) on the thickness direction (Z) of the end cover (20) completely covers the explosion-proof valve (30), and an exhaust hole (113) is formed in the boss (11); The boss (11) comprises a first protruding part (111) and a second protruding part (112), the second protruding part (112) protrudes from the first protruding part (111) and abuts against the electrode assembly (40), in the length direction (X) of the end cover (20), the size B of the first protruding part (111) and the size C of the second protruding part (112) satisfy C < B, and the opposite two end faces of the second protruding part (112) are located between the opposite two end faces of the first protruding part (111).

2. The battery cell of claim 1, wherein, A first groove (1111) is formed on the side of the first protruding part (111) away from the electrode assembly (40), the minimum distance A between the groove bottom wall of the first groove (1111) and the explosion-proof valve (30) in the thickness direction (Z) of the end cover (20) is A >= 0.2mm.

3. The battery cell of claim 1, wherein, The battery cell further comprises a second insulating piece (70), the second insulating piece (70) is foldably connected to the two ends of the first insulating piece (10) arranged along the length direction (X) of the end cover (20), and the second insulating piece (70) is located on the side of the first insulating piece (10) facing the electrode assembly (40); Along the length direction (X) of the end cover (20) and on the two sides of the second protruding part (112), the first protruding part (111) forms two oppositely arranged mounting areas (1113), any one of a clamping protrusion (114) and a clamping groove (71) is mounted on each mounting area (1113), and the other one of the clamping protrusion (114) and the clamping groove (71) is correspondingly arranged on the second insulating piece (70), and the two are clamped and matched.

4. The battery cell of claim 3, wherein, The first protruding part (111) has a first surface (1112) facing the electrode assembly (40), and the first surface (1112) at least partially forms the mounting area (1113); and the second protruding part (112) has a second surface (1122) facing the electrode assembly (40); The first insulating piece (10) is provided with a clamping protrusion (114), the clamping protrusion (114) of the first insulating piece (10) and the second insulating piece (70) are located between the first surface (1112) and the second surface (1122), and the second protruding part (112) directly abuts against the electrode assembly (40); or, The clamping protrusion (114) on the first insulating member (10) and the second insulating member (70) protrude the second surface (1122) in the direction towards the electrode assembly (40), and the second protrusion (112) indirectly abuts against the electrode assembly (40) through the second insulating member (70).

5. The battery cell of claim 4, wherein, The battery monomer further comprises an adapter (50) corresponding to the mounting area (1113), the adapter (50) is partially located in the corresponding mounting area (1113), and the adapter (50) is provided with a notch (53), the clamping protrusion (114) on the first insulating member (10) is arranged in the notch (53) of the adapter (50) installed in the same mounting area (1113).

6. The battery cell of claim 1, wherein, 1 7. The battery cell of claim 1, wherein, The size of the second protrusion (112) in the width direction (Y) of the end cover (20) is E; The explosion-proof valve (30) has an explosion-proof area (31), the explosion-proof area (31) is circular; the diameter of the explosion-proof area (31) is D, D 8. The battery cell of claim 1, wherein, The explosion-proof valve (30) has an explosion-proof area (31), the area of the explosion-proof area (31) is M, the area of the normal projection of the boss (11) in the thickness direction (Z) of the end cover (20) is N, N≤5M.

9. The battery cell of claim 1, wherein: The first protrusion (111) is provided with a first groove (1111) on the side away from the electrode assembly (40), the second protrusion (112) is provided with a second groove (1121) on the side away from the electrode assembly (40), and the exhaust hole (113) is arranged on the first protrusion (111) and the second protrusion (112), the exhaust hole (113) on the first protrusion (111) is communicated with the first groove (1111), and the exhaust hole (113) on the second protrusion (112) is communicated with the second groove (1121).

10. A battery, characterized by The battery monomer comprises the battery monomer according to any one of claims 1 to 9.

11. An electrical device, characterized by The battery comprises the battery according to claim 10, or the battery monomer according to any one of claims 1 to 9.

Images