Single cells, battery packs and electrical equipment

Abstract

The present application discloses a single cell, a battery pack, and an electrical device, belonging to the field of battery technology. The pole of the single cell is connected to the connector by cooperating with the limiting groove of the riveted part and the limiting boss of the connector, thereby realizing the riveted assembly and fixation of the pole, the connector, and the plate. By setting the first dimension H between the connector and the main body of the pole and the second dimension D1 of the limiting groove to meet the following conditions: 0.15≤D1-H≤0.4, the two dimensions are adapted to each other and the deviation is within a limited range. In this way, when the pole material is squeezed and deformed toward the main body in the first direction during the riveting process, there is a suitable reserved gap to accommodate the squeezed material, thereby reducing the occurrence of poor pole flatness. It can also reduce the situation where the height stability of the pole is affected due to excessive deformation space of the material due to the reserved gap being too large, and the excessive sinking of the material, thereby improving the compressive stability of the pole.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a single cell, a battery pack and an electrical device. Background Art

[0002] Batteries, as essential components for energy storage and release, are widely used in mobile devices, electric vehicles, and energy storage. With the development and application of battery technology, the safety and stability requirements for individual cells are constantly increasing. The rapid adoption of electric vehicles, in particular, has placed even stricter safety requirements on batteries. Currently, the terminal of individual cells suffers from insufficient pressure stability, impacting their safety. Summary of the Invention

[0003] Purpose of the invention: An embodiment of the present application provides a single cell battery, aiming to overcome the technical problem of insufficient pressure-bearing stability of the pole of the current single cell battery; another purpose of the embodiment of the present application is to provide a battery pack; the third purpose of the embodiment of the present application is to provide an electrical device.

[0004] Technical solution: A single cell battery according to an embodiment of the present application includes a cover plate assembly, wherein the cover plate assembly includes:

[0005] A plate body having a first direction and a second direction intersecting each other, wherein the plate body is provided with a first through hole in the first direction;

[0006] a connecting member disposed on one side of the plate in the first direction, wherein the connecting member is provided with a second through hole corresponding to the first through hole in the first direction, and a hole wall of the second through hole is provided with a limiting boss;

[0007] The pole comprises a main body portion and a riveted portion connected to each other, the main body portion being passed through the first through hole, the riveted portion being provided on one side of the main body portion in the first direction and passing through the second through hole, a limiting groove being provided at one end of the riveted portion close to the main body portion, the limiting groove extending along the circumference of the riveted portion, and the limiting boss being embedded in the limiting groove;

[0008] The connecting member and the main body are spaced apart from each other in the first direction and have a first dimension H mm, and the limiting groove has a second dimension D1 mm in the second direction; satisfying:

[0009] 0.15≤D1-H≤0.4.

[0010] In some embodiments, the following conditions are also met:

[0011] 0.2≤D1≤0.6.

[0012] In some embodiments, the following conditions are also met:

[0013] 0.05≤H≤0.2.

[0014] In some embodiments, the connecting member is further provided with an avoidance groove, the avoidance groove being provided on a side of the connecting member away from the plate body and being communicated with the second through hole, the avoidance groove having a groove bottom wall and a groove side wall, the groove bottom wall being provided around the riveted portion, and the groove side wall surrounding and connected to the groove bottom wall;

[0015] The groove sidewall and the riveted portion have a third dimension D2 mm in the second direction, satisfying: 0.5≤D2≤1.0.

[0016] In some embodiments, the riveted portion includes a first surface facing away from the main body portion, the groove bottom wall and the first surface are welded and fixed, and the weld between the groove bottom wall and the first surface has a weld width W mm in the second direction, satisfying: 0.8≤W≤1.8.

[0017] In some embodiments, the flatness of the groove bottom wall is 0.05 mm to 0.1 mm.

[0018] In some embodiments, the maximum radius of the riveted portion is R mm, and the compressive strength of the material of the pole is Mpa, the material safety factor of the pole is B ,satisfy:

[0019] .

[0020] In some embodiments, the rivet portion has a minimum radius r mm at the limiting groove, the maximum radius of the rivet portion is R mm, and the compressive strength of the material of the pole is Mpa, the material safety factor of the pole is B ,satisfy:

[0021] D1=Rr, and .

[0022] Accordingly, a battery pack described in an embodiment of the present application includes a single cell as described in any of the above embodiments.

[0023] Accordingly, an electrical device described in an embodiment of the present application includes a single cell as described in any of the above embodiments, or includes a battery pack as described above.

[0024] Beneficial effects: A single battery according to an embodiment of the present application includes a cover plate assembly, which includes: a plate body having a first direction and a second direction intersecting each other, the plate body being provided with a first through hole in the first direction; a connecting member being arranged on one side of the plate body in the first direction, the connecting member being provided with a second through hole corresponding to the first through hole in the first direction, and a hole wall of the second through hole being provided with a limiting boss; a pole including a main body portion and a rivet portion connected to each other, the main body portion being passed through the first through hole, the rivet portion being arranged on one side of the main body portion in the first direction and passing through the second through hole, a limiting groove being provided at one end of the rivet portion close to the main body portion, the limiting groove extending along the circumference of the rivet portion, and the limiting boss being embedded in the limiting groove; the connecting member and the main body portion being spaced apart from each other in the first direction and having a first dimension H mm, and the limiting groove having a second dimension D1 mm in the second direction; satisfying: 0.15≤D1-H≤0.4. In the embodiment of the present application, the pole of the single cell is connected to the connector by means of a limiting groove formed by its riveted portion and a limiting boss formed on the wall of the second through hole on the connector, thereby achieving riveted assembly and fixation of the pole, the connector, and the plate. By setting the first dimension H between the connector and the main body of the pole and the second dimension D1 of the limiting groove to satisfy the following conditions: 0.15≤D1-H≤0.4, the two dimensions are adapted to each other and the deviation is within a limited range. In this way, when the pole material is squeezed and deformed toward the main body in the first direction during the riveting process, there is a suitable reserved gap to accommodate the squeezed material, thereby reducing the occurrence of poor pole flatness. It can also reduce the situation where the height stability of the pole is affected due to excessive deformation space of the material due to the reserved gap being too large, and the excessive sinking of the material, thereby improving the compressive stability of the pole.

[0025] The electrical equipment of the embodiment of the present application may include all the technical features and beneficial effects of the above-mentioned battery pack, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of a single cell according to an embodiment of the present application;

[0028] Figure 2 This is a front view of the cover assembly of a single cell according to an embodiment of the present application;

[0029] Figure 3 For the Figure 2 Schematic diagram of the cross-sectional structure along the AA line;

[0030] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure of area A in the middle;

[0031] Figure 5 for Figure 4 Schematic diagram of the structure after removing the pole;

[0032] Figure 6 A schematic side view of the structure of a battery cell according to an embodiment of the present application;

[0033] Figure markings: 100-cover plate assembly; 110-plate body; 111-first through hole; 120-connecting piece; 121-second through hole; 122-hole wall; 1221-limiting boss; 123-avoidance groove; 1231-groove bottom wall; 1232-groove side wall; 130-pole; 131-main body; 132-riveted part; 1321-limiting groove; 1322-first surface. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "top," "bottom," "inner," "outer," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. In the description of this application, "plurality" means two or more, and "at least one" means one, two, or more, unless otherwise specifically defined. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, to mean fixed, removable, or integral; directly or indirectly through an intermediary; or to refer to internal communication between two components or the interaction between two components. The terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance or to implicitly specify the number of the technical features indicated. Therefore, features designated "first" or "second" may explicitly or implicitly include one or more of such features.

[0036] In the description of the present application, the first direction X and the second direction Y are introduced to more clearly describe the shape and / or structure of each component in the battery pack, as well as the connection relationship and / or relative position relationship between the components. The first direction X is the thickness direction of the plate 110, and the second direction Y intersects with the first direction X. Optionally, the second direction Y and the first direction X are perpendicular to each other. The perpendicularity here means completely perpendicular or almost completely perpendicular. For example, the angle between the second direction Y and the first direction X is considered perpendicular within the range of 90±5°. Optionally, the second direction Y can be the length direction or the width direction of the plate 110. In the accompanying drawings, the arrow marked X indicates the first direction X, and the arrow marked Y indicates the second direction Y. It can be understood that the first direction X and the second direction Y can also be the opposite directions of the directions indicated by the corresponding arrows.

[0037] The inventors note that the stability and reliability of a finished battery are determined by the stability and reliability of its components. The compressive strength and reliability of the battery's terminals, as well as the flatness of the tab contact surface, are fundamental to the stability of the battery and its system. Current batteries are lacking in this regard.

[0038] In view of this, an embodiment of the present application provides a single cell, wherein the pole of the single cell has good compressive strength and compressive reliability, and the contact surface between the connector and the tab of the pole has good flatness.

[0039] Please also refer to Figure 1 and Figure 2 The single cell battery of the present embodiment includes a cap assembly 100. The cap assembly 100 is used to connect to the housing of the single cell battery and seal the housing's cavity, thereby enclosing the cell's inner core (which may be a wound core or a stacked core), electrolyte, and other components within the cavity. The cap assembly 100 also serves to lead the cell's inner core circuitry to the exterior of the single cell battery.

[0040] Please combine Figure 2 and Figure 3 In some embodiments, the cover plate assembly 100 includes a plate body 110, a connector 120 and a pole 130. The plate body 110 is the basic structural component of the cover plate assembly 100 and is connected to the shell of the single battery. The connector 120 and the pole 130 are arranged thereon.

[0041] Please also refer to Figure 4 and Figure 5The plate body 110 is provided with a first through hole 111, which passes through the plate body 110 along the first direction X and is used to pass through the assembly pole 130. The connecting member 120 is provided on one side of the plate body 110 in the first direction X. Specifically, the connecting member 120 is provided on the side of the plate body 110 away from the battery core and is used to rivet and fix the pole 130. The connecting member 120 is provided with a second through hole 121 corresponding to the first through hole 111 in the first direction X. The second through hole 121 is substantially coaxial with the first through hole 111 in the first direction X, so as to pass through the assembly pole 130 together with the first through hole 111 to achieve riveting and fixation of the pole 130. The hole wall 122 of the second through hole 121 is provided with a limiting boss 1221. Optionally, the limiting boss 1221 is arranged on the hole wall 122 along the circumference of the second through hole 121 and protrudes toward the central axis of the second through hole 121.

[0042] Please also refer to Figure 4 and Figure 6 The pole 130 is passed through the first through hole 111 and the second through hole 121, and includes a main body 131 and a rivet portion 132 connected to each other. The main body 131 is passed through the first through hole 111 and is used to be electrically connected to the battery core. The rivet portion 132 is arranged on one side of the main body 131 in the first direction X and is passed through the second through hole 121. Specifically, the rivet portion 132 is connected to one end of the main body 131 away from the battery core. A limiting groove 1321 is provided at one end of the rivet portion 132 close to the main body 131. The limiting groove 1321 extends along the circumference of the rivet portion 132, and the limiting boss 1221 is embedded in the limiting groove 1321, thereby riveting the pole 130 to the connector 120 and the plate body 110. It can be understood that by passing the pole 130 through the first through hole 111 and the second through hole 121, and applying pressure from the upper end of the pole 130 (i.e., the end away from the battery core), the material at the upper end is deformed and flows to both sides and downward, thereby achieving riveting and forming the riveted portion 132 and its limiting groove 1321 structure.

[0043] Please refer again Figure 4 The connecting member 120 and the main body 131 are spaced apart in the first direction X and have a first dimension H mm, i.e., the gap between the connecting member 120 and the main body 131 in the first direction X is the first dimension H mm. The limiting groove 1321 has a second dimension D1 mm in the second direction Y, i.e., the depth dimension of the limiting groove 1321 in the second direction Y is the second dimension D1 mm; and the following conditions are satisfied: 0.15 ≤ D1 - H ≤ 0.4.

[0044] The first dimension H and the second dimension D1 can be measured using conventional measuring tools such as vernier calipers and micrometers, or optical measurement, imaging measurement, or other measurement methods. For example, these dimensional parameters can be measured using optical principles using equipment such as an optical projector, a microscope, or an optical measuring instrument, or by taking an image of the workpiece and analyzing it using a camera and image processing software. The first dimension H is obtained by measuring the distance between the lower surface of the connector 120 and the upper surface of the main body 131. The lower surface is the surface of the connector 120 facing the main body 131, and the upper surface is the surface of the main body 131 facing the connector 120. The lower surface of the connector 120 and the upper surface of the main body 131 are at least partially opposite. The second dimension D1 is obtained by measuring the depth of the limiting groove 1321, that is, measuring the distance between the bottom surface of the limiting groove 1321 and the outermost circumferential side surface of the rivet 132 (the circumferential side surface of the hanging platform) in the second direction Y.

[0045] The first dimension H and the second dimension D1 are set to satisfy the following: 0.15 ≤ D1 - H ≤ 0.4, so that the two dimensions are compatible with each other and the deviation is within a limited range, that is, H increases as D1 increases. This configuration ensures that when the material of the pole 130 is squeezed and deformed toward the main body 131 in the first direction X during the riveting process, a suitable reserved gap is provided to accommodate the squeezed material, thereby reducing the occurrence of poor flatness at the top of the pole 130. It also reduces the impact on the height stability of the pole 130 caused by excessive deformation space and excessive material sinking due to an excessively large reserved gap, thereby improving the compressive stability of the pole 130. Optionally, D1-H can be any value among 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, or a range between any two values.

[0046] When D1-H is outside the above-mentioned numerical range, the gap between the connector 120 and the main body 131 and the depth adaptability of the limiting groove 1321 are reduced. When H is larger relative to D1, D1-H is smaller, the lower gap is relatively larger and the area supported by the upper limiting boss 1221 is relatively small, which will cause the material of the pole 130 to be squeezed and sink, which may affect the height stability of the pole 130. When D1 is larger relative to H, D1-H is larger, the lower gap is relatively small and the area supported by the upper limiting boss 1221 is relatively large, during the riveting process of the pole, there is material extrusion and flow to the lower part, and the lower gap is not reserved enough, which may cause the pole 130 to have poor flatness. Therefore, the embodiment of the present application controls the value of D1-H to 0.15 to 0.4, to ensure the height stability and pressure resistance of the pole 130, and to ensure the flatness of the pole 130.

[0047] In some embodiments, the single battery cell further satisfies the following: 0.2 ≤ D1 ≤ 0.6. That is, D1 can be any value among 0.2, 0.3, 0.4, 0.5, 0.6, or a range between any two values. Because the limiting groove 1321 is formed during the riveting process by squeezing the rivet portion 132 toward the limiting boss 1221, the rivet portion 132 is squeezed and deformed toward the limiting boss 1221, forming a hanging platform that hangs on the limiting boss 1221. The size of the limiting groove 1321 is also the size of the hanging platform. Furthermore, the size of the limiting groove 1321 is related to the size of the limiting boss 1221. The larger the size of the limiting boss 1221, the larger the size of the limiting groove 1321, and the smaller the size of the limiting boss 1221, the smaller the size of the limiting groove 1321. In particular, in some embodiments, the size of the limiting groove 1321 is substantially the same as the size of the limiting boss 1221. Setting D1 within the above range, i.e., the size of the mounting platform within the above range, can further ensure stability during riveting and further ensure the compressive strength of the pole 130 in the first direction X. Within the above range, the larger D1 is, the greater the compressive strength of the pole 130 is, and the smaller D2 is, the smaller the deformation of the pole 130 during the riveting process is, and the more stable the riveting is.

[0048] In some embodiments, the battery cells further satisfy the following condition: 0.05 ≤ H ≤ 0.2. That is, H can be any value among 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, and 0.20, or a range between any two values. Setting H within this range further ensures the flatness of the terminal 130 and its compressive strength in the first direction X. When H is within this range, a larger H increases the gap between the connector 120 and the body 131 in the first direction X, leaving more room for material deformation, preventing material accumulation and ensuring the flatness of the top of the terminal 130. A smaller H decreases the gap between the connector 120 and the body 131 in the first direction X, leaving less room for deformation and minimizing the impact on compressive stability in the first direction X.

[0049] Please also refer to Figures 4 and 5 In some embodiments, the connector 120 further includes an escape groove 123. The escape groove 123 is located on a side of the connector 120 away from the plate 110 and communicates with the second through hole 121. The escape groove 123 includes a bottom wall 1231 and side walls 1232. The bottom wall 1231 surrounds the rivet 132, while the side walls 1232 surround and connect to the bottom wall 1231. The side walls 1232 and the rivet 132 have a third dimension D2 mm in the second direction Y, satisfying the following: 0.5 ≤ D2 ≤ 1.0. Setting D2 within the above range can ensure the welding yield of the connector 120 and the terminal 130, ensure the flatness of the terminal 130, reduce weld mark flanging, ensure welding stability, and reduce the impact on the welding trajectory, thereby reducing costs.

[0050] Please combine Figure 6 In some embodiments, the riveted portion 132 includes a first surface 1322 facing away from the main body 131. The groove bottom wall 1231 and the first surface 1322 are welded to each other, and the weld between the groove bottom wall 1231 and the first surface 1322 has a weld width W mm in the second direction Y, satisfying the following: W = 2 * (D2 - 0.1), resulting in 0.8 ≤ W ≤ 1.8. Controlling the weld width within the above range ensures that the connector 120 and the terminal 130 have a relatively suitable effective welding area, thereby ensuring weld strength and torsional strength. The weld width refers to the maximum transverse dimension of the weld formed during the welding process in a specified direction. In this description, the weld width (W mm) specifically refers to the transverse width of the molten area of ​​the weld joint between the groove bottom wall 1231 and the first surface 1322 along the second direction Y (i.e., perpendicular to the weld axis).

[0051] In some embodiments, the flatness of the groove bottom wall 1231 and the first surface 1322 is 0.05 mm to 0.1 mm. This ensures the flatness yield of the contact surface with the tab, improves the reliability and overcurrent stability of the soldering to the tab, thereby ensuring soldering reliability during package production and performance reliability after package production, while also reducing costs caused by defects. Flatness measurement can be achieved using methods such as flatbed measurement, optical measurement, three-dimensional coordinate measurement, and surface profilometer measurement. For example, a flat plate can be used as a reference plane, the surface to be measured can be brought into contact with the flat plate, and a measuring tool (such as a vernier caliper, micrometer, or optical projector) can be used to measure the gap between the surface and the plate, or the height difference at the contact point. By measuring multiple measurement points, the surface flatness can be determined. For example, optical measurement equipment, such as an optical projector or laser interferometer, can be used to scan or project the surface to be measured. Surface flatness information can be obtained by analyzing the optical image or interference pattern. For example, a three-dimensional coordinate measuring machine can be used to scan or measure the surface to be measured. A coordinate measuring machine (CMM) measures the coordinates of multiple points to construct a three-dimensional model of a surface and calculate its flatness. For example, a surface profiler scans the surface to be measured, acquiring profile data. By analyzing this profile data, the surface flatness can be calculated.

[0052] In some embodiments, the maximum radius of the rivet 132 is R mm, and the compressive strength of the material of the pole 130 is Mpa, the material safety factor of the pole 130 is B When the pole 130 is made of aluminum, the compressive strength It is 110 to 130Mpa, usually 110, 120, 130 and other constant values ​​can be taken. The material safety factor is B The value is 2.5 to 3.5, usually 3. The single cell also meets the following requirements: Among them, the safety factor refers to the conservative estimate of material strength used in design and engineering applications to ensure the safety and reliability of the structure. The compressive strength and safety factor of different materials can be obtained by querying the corresponding material standards and specifications, engineering manuals. By setting , so that the torsional strength of the pole 130 can reach more than 15N·m. Torsional strength = welding strength * twisting radius, where the twisting radius is R + 1 / 2W, welding strength = welding effective area * material tensile strength * safety factor, effective weld width W = 2 * (D2-0.1), and the effective welding area is: , that is, torsional strength = 2

[0053] In some embodiments, the rivet portion 132 has a minimum radius r mm at the limiting groove 1321, a maximum radius R mm, and a compressive strength of the material of the pole 130 is Mpa, the material safety factor of the pole 130 is B , the single cell also satisfies: D1=Rr, and That is, the pressure that the pole 130 can withstand in the first direction X can reach more than 1200N.

[0054] The following provides several examples and comparative examples to illustrate the technical effects of the single-cell battery of the present application. In each example and comparative example, the terminal 130 is made of aluminum, and the minimum radius r of the riveted portion 132 at the limiting groove 1321 is 2.8 mm (calculated based on the 5.6 mm top diameter of the terminal 130 before riveting). The data for each example and comparative example are shown in the table below, where A represents the pressure-bearing area, i.e., the area of ​​the hanging platform formed by riveting the top of the riveted portion 132 of the terminal 130. , unit mm 2 , then the theoretical compressive strength F in the first direction X is: .in , , . The compressive strength test method in the first direction X is: fix the cover assembly 100, and make its bottom suspended in the air, use a pressure block on the top (the flat surface contacts the upper surface of the contact pole 130), apply a load until the pole 130 falls off, and record the failure pressure value, which is the actual measured value of the compressive strength. The torsional strength test method is: fix the cover assembly 100, clamp the pole 130 and rotate it until the pole 130 deflects by more than 15°, and record the torque value, which is the actual value of the torsional strength. The compressive stability in the first direction X is characterized by the compressive deformation. The compressive deformation in the first direction X is the difference calculated by comparing the height dimension of the pole 130 after the test with the height dimension before the test. The applied pressure is 1000N, and the application duration is 60S.

[0055] The details are as follows:

[0056]

[0057] As shown in the table above, in Comparative Examples 1 and 2, D1-H are 0.6 and 0.05 respectively, both outside the 0.15 to 0.4 set in the embodiments of the present application. The flatness of the groove bottom wall 1231 and the first surface 1322 of Comparative Example 1 is 0.4, which is relatively high and may affect the reliability and overcurrent stability of the welding bar. The compressive strength of the pole of Comparative Example 2 is low, and the compressive stability is relatively poor (large compression deformation).

[0058] Accordingly, an embodiment of the present application further provides a battery pack, which includes a single cell according to any of the above embodiments, and can have all the technical features and effects of the above single cells, which will not be described in detail here.

[0059] Accordingly, an embodiment of the present application provides an electrical device, which can be various types of equipment such as new energy vehicles, computers, energy storage and power supply devices, etc. It can be understood that the electrical device can include all the technical features and beneficial effects of the above-mentioned single battery or the above-mentioned battery pack, which will not be repeated here.

[0060] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0061] The above is a detailed introduction to the battery pack and electrical equipment provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single battery, characterized in that: The invention comprises a cover plate assembly, wherein the cover plate assembly comprises: A plate body having a first direction and a second direction intersecting each other, wherein the plate body is provided with a first through hole in the first direction; a connecting member disposed on one side of the plate in the first direction, wherein the connecting member is provided with a second through hole corresponding to the first through hole in the first direction, and a hole wall of the second through hole is provided with a limiting boss; The pole comprises a main body portion and a riveted portion connected to each other, the main body portion being passed through the first through hole, the riveted portion being provided on one side of the main body portion in the first direction and passing through the second through hole, a limiting groove being provided at one end of the riveted portion close to the main body portion, the limiting groove extending along the circumference of the riveted portion, and the limiting boss being embedded in the limiting groove; The connecting member and the main body are spaced apart from each other in the first direction and have a first dimension H mm, where the first dimension H mm is the distance between the lower surface of the connecting member and the upper surface of the main body; the limiting groove has a second dimension D1 mm in the second direction, where the second dimension D1 mm is the depth of the limiting groove; and the following condition is satisfied: 0.15≤D1-H≤0.

4.

2. The single cell according to claim 1, characterized in that: Also meets: 0.2≤D1≤0.6。 3. The single cell according to claim 1, characterized in that: Also meets: 0.05≤H≤0.2。 4. The single cell according to claim 1, characterized in that: The connecting member is further provided with an avoidance groove, which is arranged on a side of the connecting member away from the plate body and is connected to the second through hole. The avoidance groove has a groove bottom wall and a groove side wall, the groove bottom wall is arranged around the riveted portion, and the groove side wall surrounds and is connected to the groove bottom wall; The groove sidewall and the riveted portion have a third dimension D2 mm in the second direction, satisfying: 0.5≤D2≤1.

0.

5. The single cell according to claim 4, characterized in that: The riveted portion includes a first surface facing away from the main body portion, the groove bottom wall and the first surface are welded and fixed, and the weld between the groove bottom wall and the first surface has a weld width W mm in the second direction, satisfying: 0.8≤W≤1.

8.

6. The single cell according to claim 5, characterized in that: The flatness of the groove bottom wall and the first surface is 0.05 mm to 0.1 mm.

7. The single cell according to claim 5, characterized in that: The maximum radius of the riveted portion is R mm, and the compressive strength of the pole material is Mpa, the material safety factor of the pole is B ,satisfy: .

8. The single cell according to claim 1, characterized in that: The rivet portion has a minimum radius r mm at the limiting groove, a maximum radius R mm, and the compressive strength of the pole material is Mpa, the material safety factor of the pole is B ,satisfy: D1=Rr, and .

9. A battery pack, characterized in that: The invention comprises the single battery according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The method comprises the single cell according to any one of claims 1 to 8, or comprises the battery pack according to claim 9.

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