Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer which comprises a shell, a battery cell, a collector plate and a cover plate, when the cover plate is assembled, the cover plate covers the opening of the shell, and the protruding part of the cover plate extends into the shell from the opening and abuts against the inner wall of the shell, so that the cover plate is radially positioned; and the propping part of the cover plate is propped against the end surface of the opening, so that the cover plate is axially positioned. Moreover, as the flangings avoid the protruding part, and the flangings do not extend to the space between the side wall of the protruding part and the inner wall of the shell, the flangings do not interfere with the cover plate. Therefore, the positioning precision of the cover plate is relatively high, so that the assembly precision of the battery monomer can be improved. In addition, the utility model also provides a battery and an electric device.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field especially relates to a battery monomer, battery and electric device. BACKGROUND

[0002] When assembling the battery monomer, the current collecting disc is generally used to connect the shell and the winding core, so that the shell is used as an electrode. In order to ensure a large current passing area and good heat dissipation performance, the current collecting disc also needs to be edge folded to increase the fitting area with the inner wall of the shell. However, the edge folding of the current collecting disc may interfere with the bottom cover, so that the bottom cover cannot be positioned smoothly, thereby affecting the assembly precision. SUMMARY

[0003] Therefore, it is necessary to provide a battery monomer, a battery and an electric device capable of improving assembly precision in view of the above problems.

[0004] In one aspect, the present application provides a battery monomer, which comprises a shell, an electric core, a current collecting disc and a cover plate. The shell is provided with an opening at least at one end, and the electric core is accommodated in the shell. The current collecting disc comprises a disc body and an edge folding along the circumference of the disc body, and the current collecting disc is accommodated in the shell, and the edge folding is welded with the inner wall of the shell. The cover plate comprises a protruding part, the protruding part extends into the shell from the opening and abuts against the inner wall of the shell, and the edge folding forms a clearance for the protruding part.

[0005] In one embodiment, the edge folding is inclined outwardly relative to the disc body, and the current collecting disc is in interference fit with the shell, so that the edge folding elastically abuts against the inner wall of the shell.

[0006] In one embodiment, a plurality of notches are formed on the edge folding and are arranged at intervals along the extension direction of the edge folding.

[0007] In one embodiment, the outer diameter of the protruding part decreases in the direction from the opening to the inside of the shell along the axial direction of the shell.

[0008] In one embodiment, the outer diameter of the protruding part remains unchanged in the direction from the opening to the inside of the shell along the axial direction of the shell.

[0009] In one embodiment, the cover plate is partially recessed inwardly to form a circular groove on the side of the cover plate away from the electric core, and the protruding part is formed on the side of the cover plate facing the electric core.

[0010] In one embodiment, the cover plate is partially recessed inwardly to form an annular groove extending in the circumferential direction on the side of the cover plate away from the electric core, and the protruding part is formed on the side of the cover plate facing the electric core.

[0011] In one of the embodiments, the cover plate further comprises a bearing portion extending along the circumference of the protruding portion, the bearing portion being overlapped with the end surface of the opening to position the cover plate along the axial direction of the shell.

[0012] In one of the embodiments, the outer diameter of the bearing portion is less than or equal to the outer diameter of the shell and greater than the inner diameter of the opening.

[0013] In one of the embodiments, the disc body is recessed on the side facing the battery cell to form a receiving cavity, and a convex structure is formed on the side of the disc body facing away from the battery cell, and the battery cell is partially located in the receiving cavity.

[0014] In one of the embodiments, the convex structure is abutted with the protruding portion along the axial direction of the shell.

[0015] In one of the embodiments, a gap is formed between the cover plate and the disc body.

[0016] In one of the embodiments, a flexible support is further included, and the flexible support is filled in the gap.

[0017] In one of the embodiments, the total height of the current collector plate and the cover plate along the axial direction of the shell is greater than or equal to 1.5 mm and less than or equal to 5 mm.

[0018] In one of the embodiments, the protruding portion is formed with a first chamfer towards the edge of the inner wall of the shell, the flange is formed with a second chamfer away from the edge of the inner wall of the shell, and the first chamfer and the second chamfer partially overlap along the radial direction of the shell.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] In the above battery cell, when the cover plate is assembled, the cover plate is covered on the opening of the shell, the protruding portion of the cover plate extends into the shell through the opening and abuts with the inner wall of the shell, thereby positioning the cover plate along the radial direction; and the bearing portion of the cover plate abuts with the end surface of the opening, thereby positioning the cover plate along the axial direction. Moreover, since the flange avoids the protruding portion, the flange does not extend between the side wall of the protruding portion and the inner wall of the shell, so the flange does not interfere with the cover plate. Therefore, the positioning accuracy of the cover plate is high, thereby improving the assembly accuracy of the above battery cell.

[0021] On the other hand, the present application provides a battery comprising the battery cell according to any one of the above preferred embodiments.

[0022] In addition, the present application further provides a power consumption device comprising the battery cell according to any one of the above preferred embodiments or the battery according to the above preferred embodiments. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a single battery cell in one embodiment of the present invention;

[0025] Figure 2 for Figure 1 A cross-sectional view of the battery cell shown;

[0026] Figure 3 for Figure 2 A magnified schematic diagram of part A in the shown battery cell;

[0027] Figure 4 for Figure 1 The diagram shows the structure of the current collector in the battery cell.

[0028] Figure 5 for Figure 1 The diagram shows the structure of the cover plate in the battery cell. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] In the description of this utility model, 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", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] In addition, the terms "first", "second", "third", etc. are used herein only to describe various instances, and are not used to indicate or imply relative importance or a number of indicated technical features. Thus, features defined with "first", "second", etc. 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, such as two, three, etc., unless otherwise specifically limited.

[0032] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. 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.

[0033] In the present application, unless otherwise specifically defined and limited, 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", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0034] 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 middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes, and are not the only embodiment.

[0035] Please refer to Figure 1 The present application provides a kind of battery monomer 100. In addition, the present application further provides a kind of battery and electric device.

[0036] The above-mentioned electric device includes the above-mentioned battery or the above-mentioned battery monomer 100, and can be provided with electric energy by the above-mentioned battery or the above-mentioned battery monomer 100. Wherein, the above-mentioned electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, an amusement device, an elevator and a lifting device and the like. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric car toy, an electric ship toy or an electric plane toy and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer and the like; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage and the like; the amusement device can be a carousel, a jump machine and the like.

[0037] The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile and the like; for the new energy automobile, the above-mentioned battery can be used as a driving power supply, thereby replacing fossil fuels to provide driving power. The above-mentioned electric device is not specially limited in the present application.

[0038] The above-mentioned battery can be a battery pack or a battery module. When the above-mentioned battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and a plurality of the above-mentioned battery monomers 100. The plurality of battery monomers 100 can be electrically connected in series, in parallel or in a mixed manner of series and parallel, and are communicatively connected with the battery management system, so as to form a battery pack, and the above-mentioned battery management system controls and monitors the working state of each battery monomer 100. In addition, the plurality of battery monomers 100 can be first connected in series and / or in parallel, and form a battery module with the module management system, and then a plurality of battery modules are electrically connected in series, in parallel or in a mixed manner of series and parallel, and together with the battery management system to form a battery pack.

[0039] Wherein, the plurality of battery monomers 100 in the above-mentioned battery pack or battery module can be installed on a supporting structure such as a box, a frame, a bracket and the like, and the plurality of battery monomers 100 and the battery management system can be electrically connected through a busbar component. The above-mentioned battery monomer 100 can be a lithium ion battery, a sodium ion battery or a magnesium ion battery, and the external contour thereof can be a cylinder. Specifically, in the present embodiment, the above-mentioned battery monomer 100 is a lithium ion cylindrical battery.

[0040] Please refer to Figure 2 and Figure 3 , the battery monomer 100 in an embodiment of the utility model includes a shell 110, an electric core 120, a current collecting disc 130 and a cover plate 140.

[0041] The shell 110 can be formed of aluminum, stainless steel or the like, and has an accommodation space inside to accommodate the battery cell 120, electrolyte and other components. Moreover, the shell 110 is provided with an opening at at least one end, and the battery cell 120 can be loaded into the shell 110 through the opening. Specifically, the shell 110 is cylindrical, and the battery cell 120 is also generally cylindrical and matches the internal space of the shell 110.

[0042] The current collector 130 is arranged in the shell 110, and is used to connect the battery cell 120 and the inner wall of the shell 110, so that the shell 110 serves as one electrode, such as a negative electrode, of the battery cell 110. Specifically, the current collector 130 can be pre-welded to the tab of the battery cell 120, and is loaded into the shell 110 together with the battery cell 120 through the opening, and then is welded to the inner wall of the shell 110. The cover plate 140 is welded to the shell 110 and covers the opening of the shell 110, so as to seal the opening 101 of the shell 110 and form a relatively closed environment inside the shell 110.

[0043] Please refer to Figure 4 The current collector 130 includes a disc body 131 and a flange 132 extending along the periphery of the disc body 131. The disc body 131 and the flange 132 are generally formed integrally, and the flange 132 is bent relative to the disc body 131 and protrudes axially relative to the surface of the disc body 131. The disc body 131 is generally arranged coaxially with the shell 110 and is welded to the tab of the battery cell 120, and the flange 132 is fitted and welded to the inner wall of the shell 110.

[0044] Specifically, in the embodiment, the flange 132 is inclined outward relative to the disc body 131, and the current collector 130 is in interference fit with the shell 110, so that the flange 132 elastically abuts against the inner wall of the shell 110. In this way, during the process of loading the current collector 130 into the shell 110, the inner wall of the shell 110 will force the flange 132 to elastically deform, so that the flange 132 generates an elastic force acting on the inner wall of the shell 110. Under the action of the elastic force, the flange 132 can be closely fitted to the inner wall of the shell 110, so as to ensure that the relative position between the flange 132 and the inner wall of the shell 110 remains stable.

[0045] Further, in the embodiment, a plurality of notches (not shown in the figure) are formed on the flange 132 and are arranged at intervals along the extension direction of the flange 132. The notches on the flange 132 can be used to release welding stress, so as to avoid problems such as deformation and rupture of the welding position caused by stress concentration generated by welding of the flange 132.

[0046] Please refer to Figure 5The cover plate 140 includes a protruding portion 141 protruding towards the current collector plate 130. The protruding portion 141 is formed by an opening extending into the housing 110 and abutting against the inner wall of the housing 110 to position the cover plate 140 in the radial direction of the housing 110.

[0047] Specifically, the cover plate 140 with the protruding portion 141 can be formed by stamping a plate-shaped material. The concave-convex structure on both sides of the cover plate 140 formed by stamping can increase the structural strength of the cover plate 140, and the protruding portion 141 can reduce the weight of the cover plate 140 and save costs without additional material. In one embodiment, the cover plate 140 is partially recessed inward to form a circular recess on the side of the cover plate 140 away from the battery cell 120 and form the protruding portion 141 on the side of the cover plate 140 towards the battery cell 120. That is, the area of the side of the cover plate 140 away from the battery cell 120 is recessed to form a columnar protruding portion 141.

[0048] In addition, in another embodiment, the cover plate 140 is partially recessed inward to form an annular recess extending in the circumferential direction on the side of the cover plate 140 away from the battery cell 120 and form the protruding portion 141 on the side of the cover plate 140 towards the battery cell 120. That is, the area of the side of the cover plate 140 away from the battery cell 120 is recessed to form a cylindrical protruding portion 141.

[0049] Further, the flange 132 is spaced apart from the protruding portion 141. That is, when the protruding portion 141 is positioned in the radial direction of the cover plate 140 by abutting against the inner wall of the housing 110, the flange 132 does not extend between the side wall of the protruding portion 141 and the inner wall of the housing 110, and thus does not abut against the protruding portion 141. It can be seen that the radial positioning of the cover plate 140 is achieved by the side of the protruding portion 141 abutting against the inner wall of the housing 110, and is not related to the current collector plate 130. Therefore, the uneven surface of the flange 132 caused by the timely welding does not affect the radial positioning accuracy of the cover plate 140.

[0050] In the present embodiment, the outer diameter of the protruding portion 141 remains constant in the direction from the opening to the inside of the housing 110 in the axial direction of the housing 110. That is, the protruding portion 141 is substantially cylindrical, and the side thereof is substantially parallel to the inner wall of the housing 110. Therefore, when the side of the protruding portion 141 abuts against the inner wall of the housing 110, the contact area between the two can be increased, thereby ensuring better radial positioning effect.

[0051] In another embodiment, the outer diameter of the protrusion 141 decreases in the direction from the opening to the inside of the shell 110 in the axial direction of the shell 110. That is, the protrusion 141 has a structure of being thick at the top and thin at the bottom, and the side surface of the protrusion 141 is arranged obliquely relative to the inner wall of the shell 110. In this way, the protrusion 141 can play a guiding role during insertion into the shell 110, and the side surface of the protrusion 141 can be gradually pressed against the inner wall of the shell 110.

[0052] Please refer again to Figure 3 In this embodiment, the protrusion 141 forms a first chamfer 1411 towards the edge of the inner wall of the shell 110, and the flange 132 forms a second chamfer 1321 away from the edge of the inner wall of the shell 110, and the first chamfer 1411 and the second chamfer 1321 overlap in the radial direction of the shell 110.

[0053] Specifically, the first chamfer 1411 and the second chamfer 1321 can be round chamfers or straight chamfers, and the arrangement of the first chamfer 1411 and the second chamfer 1321 can ensure that the edge of the flange 132 does not rub against the edge of the protrusion 141. Moreover, while ensuring that the flange 132 does not interfere with the protrusion 141, the current collector plate 130 and the cover plate 140 can be as close as possible, thereby also saving axial space inside the shell 110, which helps to improve the energy density of the battery monomer 100.

[0054] To further improve the energy density of the battery monomer 100, specifically in this embodiment, the total height of the current collector plate 130 and the cover plate 140 in the axial direction of the shell 110 is greater than or equal to 1.5 mm and less than or equal to 5 mm, specifically, the height can be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, …, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5.0 mm. In this way, the current collector plate 130 and the cover plate 140 occupy less space inside the shell 110, which can effectively avoid wasting space inside the shell 110 in the axial direction, thereby reserving more space for the arrangement of the battery cell 120 and improving the energy density. Specifically, the height of the cover plate 140 is generally between 0.5 mm and 2 mm, specifically, it can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, …, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm; and the height of the current collector plate 130 is generally between 0.6 mm and 2 mm, specifically, the height of the current collector plate 130 is 0.6 mm, 0.7 mm, 0.8 mm, …, 1.8 mm, 1.9 mm, 2.0 mm.

[0055] In addition, in the embodiment, a gap 101 is formed between the cover plate 140 and the disc body 131. The gap 101 can provide a buffer space for the expansion of the battery cell 120 in the height direction, i.e. the axial direction of the battery monomer 100, thereby preventing the battery cell 120 from expanding and breaking the cover plate 140.

[0056] Further, in the embodiment, the battery monomer 100 further comprises a flexible support (not shown in the figure) which is filled in the gap 101. Specifically, the flexible support can be formed by using flexible materials such as foam and silica gel, and can provide flexible support for the battery cell 120 and play a certain axial limiting role for the battery cell 120. Moreover, the flexible support can also absorb the shock impact under the shock working condition, which helps to improve the reliability of the battery monomer 100.

[0057] Obviously, based on the consideration of saving the internal space of the shell 110, the cover plate 140 can also be in contact with the disc body 131, as long as the disc body 130 does not interfere with the cooperation between the protruding portion 141 and the inner wall of the shell 110. For example, in another embodiment, in the embodiment, the disc body 131 is recessed on the side facing the battery cell 120 to form a receiving cavity (not shown in the figure), and a convex structure (not shown in the figure) is formed on the side of the disc body away from the battery cell 120. Moreover, the convex structure abuts against the protruding portion 141 in the axial direction of the shell 110. In this way, the cooperation of the convex structure and the protruding portion 141 can also increase the stability of the overall structure in the axial direction of the battery monomer 100, thereby avoiding excessive shaking inside the battery monomer 100.

[0058] Further, part of the battery cell 120 is located in the receiving cavity of the disc body 131. In this way, the battery cell 120 and the current collecting disc 130 can also share part of the space in the axial direction of the shell 110, thereby improving the space utilization rate inside the shell 110 and helping to further improve the energy density of the battery monomer 100.

[0059] Please refer again to Figure 3 and Figure 5 In the embodiment, the cover plate 140 further comprises an abutting portion 142 extending along the circumference of the protruding portion 141, and the abutting portion 142 is lapped with the end face of the opening of the shell 110 to position the cover plate 140 in the axial direction of the shell 110.

[0060] When assembling the cover plate 140, the protruding portion 141 is first inserted from the opening of the shell 110 until the abutting portion 142 abuts against the end face of the opening of the shell 110, and then the radial and axial positioning of the cover plate 140 can be realized. It can be seen that the protruding portion 141 does not need to be in contact with the current collecting disc 130 to position the cover plate 140 in the axial direction, thereby avoiding the cover plate 140 from exerting axial pressure on the current collecting disc 130 and preventing the flange 132 from being separated from the inner wall of the shell 110 due to the axial pressure. Moreover, since the axial positioning of the cover plate 140 does not need to rely on the current collecting disc 130, the accuracy of the axial positioning is also higher.

[0061] On the other hand, since the abutting portion 142 overlaps the end surface of the opening of the shell 110, a better welding position can be provided. Specifically, the joint between the shell 110 and the cover plate 140 can be welded in a lateral direction by using a laser fillet welding method, so that the welding laser can not penetrate the cover plate 140 in the axial direction and damage the elements such as the battery cell 120 inside the shell 110.

[0062] Further, in the present embodiment, the outer diameter of the abutting portion 142 is smaller than the outer diameter of the shell 110 and larger than the inner diameter of the opening.

[0063] When the abutting portion 142 overlaps the end surface of the opening of the shell 110, the outer edge of the abutting portion 142 is recessed inwardly compared to the outer wall of the shell 110, or the outer edge of the abutting portion 142 is flush with the outer wall of the shell 110. When the outer edge of the abutting portion 142 is recessed inwardly compared to the outer wall of the shell 110, a step can be formed between the outer edge of the abutting portion 142 and the end surface of the opening of the shell 110. When the cover plate 140 is welded to the shell 110, a molten pool will be formed on the step, and finally the laser weld between the shell 110 and the cover plate 140 will be accommodated in the step, so that the laser weld does not protrude from the outer wall of the shell 110 to ensure the smoothness of the overall appearance of the battery monomer 100. When the outer edge of the abutting portion 142 is flush with the outer wall of the shell 110, the height difference at the joint will be eliminated, so as to help improve the welding effect.

[0064] The above-mentioned battery monomer 100, when assembling the cover plate 140, the cover plate 140 is covered on the opening of the shell 110, and the protruding portion 141 of the cover plate 140 extends into the shell 110 and abuts against the inner wall of the shell 110, so as to position the cover plate 140 in the radial direction; and since the flange 132 avoids the protruding portion 141, the flange 132 does not extend between the side wall of the protruding portion 141 and the inner wall of the shell 110, so that the flange 132 does not interfere with the cover plate 140. Therefore, the positioning accuracy of the cover plate 140 is high, so as to improve the assembly accuracy of the above-mentioned battery monomer 100.

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present disclosure.

[0066] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A battery cell, characterized by, The shell (110) is provided with an opening at least at one end, and the electric core (120) is accommodated in the shell (110); the current collector plate (130) comprises a plate body (131) and a flange (132) extending along the periphery of the plate body (131), the current collector plate (130) is accommodated in the shell (110), and the flange (132) is welded with the inner wall of the shell (110); the cover plate (140) comprises a protruding portion (141), the protruding portion (141) extends into the shell (110) from the opening and abuts against the inner wall of the shell (110), and the flange (132) forms a clearance with the protruding portion (141).

2. The battery cell of claim 1, wherein, The flange (132) is inclined outward relative to the plate body (131), and the current collector plate (130) is in interference fit with the shell (110), so that the flange (132) elastically abuts against the inner wall of the shell (110).

3. The battery cell of claim 1, wherein, A plurality of notches are formed on the flange (132) and are arranged at intervals along the extension direction of the flange (132).

4. The battery cell of claim 1, wherein, The outer diameter of the protruding portion (141) decreases in the direction from the opening to the inside of the shell (110) along the axial direction of the shell (110).

5. The battery cell of claim 1, wherein, The outer diameter of the protruding portion (141) remains unchanged in the direction from the opening to the inside of the shell (110) along the axial direction of the shell (110).

6. The battery cell of claim 1, wherein, The cover plate (140) is partially recessed inward to form a circular groove on the side of the cover plate (140) away from the electric core (120), and the protruding portion (141) is formed on the side of the cover plate (140) facing the electric core (120).

7. The battery cell of claim 1, wherein, The cover plate (140) is partially recessed inward to form an annular groove extending in the circumferential direction on the side of the cover plate (140) away from the electric core (120), and the protruding portion (141) is formed on the side of the cover plate (140) facing the electric core (120).

8. The battery cell of claim 1, wherein, The cover plate (140) further comprises an abutting portion (142) extending in the circumferential direction of the protruding portion (141), the abutting portion (142) overlaps with the end face of the opening to position the cover plate (140) in the axial direction of the shell (110).

9. The battery cell of claim 8, wherein, The outer diameter of the abutting portion (142) is less than or equal to the outer diameter of the shell (110) and greater than the inner diameter of the opening.

10. The battery cell of claim 1, wherein, The plate body (131) is recessed on the side facing the electric core (120) to form a receiving cavity, and an upper convex structure is formed on the side of the plate body away from the electric core (120), and the electric core (120) is partially located in the receiving cavity.

11. The battery cell of claim 10, wherein, The upper convex structure abuts against the protruding portion (141) in the axial direction of the shell.

12. The battery cell of claim 1, wherein, A gap (101) is formed between the cover plate (140) and the plate body (131).

13. The battery cell of claim 12, wherein, A flexible support is further included, which is filled in the gap (101).

14. The battery cell of claim 1, wherein, The total height of the current collecting plate (130) and the cover plate (140) in the axial direction of the shell (110) is greater than or equal to 1.5 mm and less than or equal to 5 mm.

15. The battery cell of any one of claims 1 to 14, wherein, The convex part (141) is formed with a first chamfer (1411) toward the edge of the inner wall of the shell (110), and the flange (132) is formed with a second chamfer (1321) away from the edge of the inner wall of the shell (110), and the first chamfer (1411) and the second chamfer (1321) partially overlap in the radial projection of the shell (110).

16. A battery, characterized by A battery cell comprising any one of the above claims 1 to 15.

17. An electrical device, comprising: A battery comprising any one of the above claims 1 to 15 or the battery of claim 16.

Images