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. The side face of the protruding part abuts against the positioning part of the flange, so that the cover plate can be positioned in the radial direction. As the welding area of the flange is positioned between the two adjacent positioning parts, a welding mark generated by welding the flange and the inner wall of the shell is also positioned between the two positioning parts. Moreover, the height of the welding mark in the radial direction of the collector plate is not higher than that of the positioning part, so that the welding mark can be prevented from abutting against the protruding part or just making contact with the protruding part without affecting abutting connection of the positioning part and the protruding part under the support of the positioning part. Therefore, even if the welding marks are uneven, the radial positioning precision of the cover plate cannot be influenced, 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. The edge folding of the current collecting disc will form uneven welding marks during welding, which may interfere with the bottom cover, resulting in poor positioning accuracy of the bottom cover, and further affecting the overall assembly accuracy of the battery monomer. SUMMARY

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

[0004] On the one hand, the 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. The current collecting disc comprises a disc body and an edge folding extending along the circumference of the disc body. The edge folding is formed with a plurality of spaced positioning portions and a welding area between adjacent two positioning portions in the circumferential direction. The positioning portion is protruded on the inner wall of the edge folding. The welding area is welded with the inner wall of the shell and forms a welding mark. The height of the welding mark in the radial direction of the current collecting disc is not higher than the height of the positioning portion. The cover plate comprises a protruding portion protruding towards the current collecting disc. The protruding portion extends into the shell through the opening and abuts against the positioning portion to position the cover plate in the radial direction of the shell.

[0005] In one of the embodiments, a part of the edge folding is recessed inward to form a recessed portion on the outer wall of the edge folding, and the positioning portion is formed at a position corresponding to the recessed portion on the inner wall of the edge folding.

[0006] In one of the embodiments, the wall thickness of the positioning portion is smaller than the wall thickness of the welding area.

[0007] In one of the embodiments, the wall thickness of the area where the positioning portion is located is greater than the wall thickness of the area where the welding area is located, and the outer wall of the edge folding is a smooth transition curved surface.

[0008] In one of the embodiments, a plurality of positioning portions are arranged at equal intervals in the circumferential direction of the edge folding, and the welding mark is formed between each adjacent two positioning portions.

[0009] In one of the embodiments, the width of the positioning portion in the circumferential direction of the edge folding is smaller than the width of the welding area in the circumferential direction of the edge folding.

[0010] In one of the embodiments, the positioning portion has a width in the circumferential direction of the flange of greater than or equal to 10 mm.

[0011] In one of the embodiments, the positioning portion has a height in the radial direction of the current collector of greater than or equal to 0.3 mm and less than or equal to 2 mm.

[0012] In one of the embodiments, the flange is inclined outwardly relative to the disc body, and the current collector is in interference fit with the shell, so that the flange is in elastic abutment with the inner wall of the shell.

[0013] In one of the embodiments, the cover plate further comprises an abutting portion extending in the circumferential direction of the protruding portion, the abutting portion being overlapped with the end surface of the opening, so as to position the cover plate in the axial direction of the shell.

[0014] In one of the embodiments, the abutting portion has an outer diameter less than or equal to the outer diameter of the shell and greater than the inner diameter of the opening.

[0015] In one of the embodiments, the cover plate is partially recessed inwardly to form a circular recess on the side of the cover plate away from the battery cell, and the protruding portion is formed on the side of the cover plate facing the battery cell.

[0016] In one of the embodiments, the cover plate is partially recessed inwardly to form an annular recess extending in the circumferential direction on the side of the cover plate away from the battery cell, and the protruding portion is formed on the side of the cover plate facing the battery cell.

[0017] In one of the embodiments, the disc body is recessed on the side facing the battery cell to form a receiving cavity, and an upper protruding structure is formed on the side of the disc body away from the battery cell, and the battery cell is partially located in the receiving cavity.

[0018] In one of the embodiments, the upper protruding structure is in abutment with the protruding portion in the axial direction of the shell.

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

[0020] The battery cell is assembled by covering the cover plate on the opening of the shell, and the protruding part of the cover plate extends into the shell from the opening. The side surface of the protruding part abuts against the positioning part of the flange, so that the cover plate can be positioned in the radial direction. Since the welding area of the flange is located between the two adjacent positioning parts, the welding mark generated by welding the flange and the inner wall of the shell is also located between the two positioning parts. Moreover, since the height of the welding mark in the radial direction of the current collector plate is not higher than the height of the positioning part, the welding mark can be prevented from abutting against the protruding part or just contacting the protruding part without affecting the abutment between the positioning part and the protruding part under the support of the positioning part. Therefore, even if the welding mark is uneven, it will not affect the radial positioning accuracy of the cover plate, so that the assembly accuracy of the battery cell can be improved.

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

[0022] In addition, the application also provides a power consumption device comprising the battery cell according to any one of the preferred embodiments or the battery according to the preferred embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0024] Figure 1 FIG. 1 is a structural schematic view of a battery cell according to an embodiment of the application;

[0025] Figure 2 FIG. 2 is a sectional view of the battery cell shown in FIG. 1; Figure 1

[0026] Figure 3 FIG. 4 is an enlarged schematic view of a partial A in the battery cell shown in FIG. 1; Figure 2

[0027] Figure 4 FIG. 5 is a structural schematic view of a current collector plate in the battery cell shown in FIG. 1; Figure 1

[0028] Figure 5 FIG. 6 is an enlarged schematic view of a partial B in the current collector plate shown in FIG. 5; Figure 4

[0029] Figure 6 FIG. 7 is a structural schematic view of a cover plate in the battery cell shown in FIG. 1. Figure 1 DETAILED DESCRIPTION

[0030] ​​​​​In order to make the above object, characteristics and advantages of the present application more apparent, concrete embodiments of the present application will be described in detail with reference to the drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners without departing from the spirit of the present application. Those skilled in the art will appreciate the scope of the present application and can make similar modifications without departing from the spirit of the present application. Therefore, the present application is not limited by the embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In addition, the terms "first" and "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" and "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, such as two, three, etc., unless otherwise specifically limited.

[0033] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "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.

[0034] In the present application, unless otherwise specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate 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 directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0035] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another 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 for illustrative purposes only and are not the only embodiment.

[0036] Please refer to Figure 1 The utility model provides a kind of battery monomer 100. Furthermore, the utility model further provides a kind of battery and electric device.

[0037] 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. Among them, 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, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric plane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planes, etc. Energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc. Amusement devices can be carousels, jump machines, etc.

[0038] The vehicle can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended range car, etc. For new energy vehicles, the above-mentioned battery can be used as a driving power source, thereby replacing fossil fuels to provide driving power. The present application does not specially limit the above-mentioned electric device.

[0039] The above battery can be a battery pack or a battery module. When the above battery is a battery pack, the battery pack specifically comprises a battery management system (BMS) and a plurality of the above battery monomers 100. The plurality of battery monomers 100 can be electrically connected in series, parallel, or a mixed manner of series and parallel, and be communicatively connected with the battery management system, so as to form a battery pack, and the 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 parallel, and form a battery module with the module management system, and then a plurality of battery modules are electrically connected in series, parallel, or a mixed manner of series and parallel, and form a battery pack with the battery management system.

[0040] The plurality of battery monomers 100 in the above battery pack or battery module can be mounted on a support structure such as a box, a frame, a bracket, etc., and the plurality of battery monomers 100 can be electrically connected through a busbar component. The above battery monomer 100 can be a lithium ion battery, a sodium ion battery, or a magnesium ion battery, and the external profile thereof can be a cylinder. Specifically, in the embodiment, the above battery monomer 100 is a lithium ion cylindrical battery.

[0041] Please refer to Figure 2 and Figure 3 , the battery monomer 100 in an embodiment of the utility model comprises a shell 110, an electric core 120, a current collecting disc 130 and a cover plate 140.

[0042] The shell 110 can be formed by aluminum, stainless steel or other materials, and has an accommodation space inside, which can accommodate the electric core 120, electrolyte and other components. Moreover, at least one end of the shell 110 is provided with an opening, and the electric core 120 can be loaded into the shell 110 through the opening. Specifically, the shell 110 is cylindrical, and the electric core 120 is matched with the internal space of the shell 110, and is generally cylindrical.

[0043] The current collecting disc 130 is arranged in the shell 110, and is used for connecting the electric core 120 and the inner wall of the shell 110, so that the shell 110 serves as one electrode of the battery monomer 100, such as a negative electrode. Specifically, the current collecting disc 130 can be pre-welded with the tab of the electric core 120, and is loaded into the shell 110 together with the electric core 120 through the opening, and then is welded with 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, so as to form a relatively closed environment in the shell 110.

[0044] Please refer to Figure 4 and Figure 5The current collector plate 130 comprises a plate body 131 and a flange 132 extending along the periphery of the plate body 131. The plate body 131 and the flange 132 are generally formed as an integral structure, the flange 132 is bent relative to the plate body 131 and protrudes axially relative to the surface of the plate body 131. The plate body 131 is generally coaxially arranged with the shell 110 and is welded with the tab of the battery cell 120, while the flange 132 is in abutment with and welded to the inner wall of the shell 110.

[0045] Specifically, in the present embodiment, 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 is in elastic abutment with the inner wall of the shell 110. In this way, during the process of assembling the current collector plate 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 abutted with the inner wall of the shell 110, thereby ensuring that the relative position between the flange 132 and the inner wall of the shell 110 remains stable.

[0046] Further, the flange 132 is formed with a plurality of spaced positioning portions 1321 and welding zones between adjacent two positioning portions 1321 in the circumferential direction. The positioning portions 1321 are protruded on the inner wall of the flange 132, and the welding zones are welded to the inner wall of the shell 110 and form welding marks 1322. Moreover, the height of the welding mark 1322 is not higher than the height of the positioning portion 1321 in the radial direction of the current collector plate 130.

[0047] The welding mark 1322 between the flange 132 and the inner wall of the shell 110 is discontinuous rather than continuous, and a plurality of discontinuous welding marks 1322 are separated by the positioning portions 1321. Moreover, since the height of the welding mark 1322 is not higher than the height of the positioning portion 1321, the welding mark 1322 can be flush with the positioning portion 1321 or inwardly recessed between the two adjacent positioning portions 1321. Preferably, the height of the welding mark 1322 is lower than the height of the positioning portion 1321, so that the welding mark 1322 is inwardly recessed between the two adjacent positioning portions 1321.

[0048] Specifically, in the present embodiment, the height of the positioning portion 1321 in the radial direction of the current collector plate 130 is greater than or equal to 0.3 mm and less than or equal to 2 mm, and specifically can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, …, 1.8 mm, 1.9 mm, 2.0 mm. This is because the height of the welding mark 1322 formed by laser welding is generally less than 0.3 mm, so setting the height of the positioning portion 1321 in the radial direction of the current collector plate 130 to be greater than or equal to 0.3 mm can ensure that the height of the welding mark 1322 is lower than the height of the positioning portion 1321; however, if the height of the positioning portion 1321 is greater than 2 mm, the size of the flange 132 will be increased, resulting in greater difficulty in processing.

[0049] Specifically, in the present embodiment, the width of the positioning portion 1321 in the circumferential direction of the flange 132 is less than the width of the welding zone in the circumferential direction of the flange 132. That is, the welding zone occupies a larger proportion of the flange 132 than the positioning portion 1321, so the area of the welding zone can be increased, thereby ensuring that the formed welding bead 1322 has a larger size, and further ensuring the flow area between the current collector plate 130 and the shell 110, avoiding the problem that the flow capacity between the current collector plate 130 and the shell 110 is affected due to the discontinuous structure of the formed welding bead 1322.

[0050] In addition, in the present embodiment, part of the flange 132 is inwardly recessed to form a recessed portion 1323 on the outer wall of the flange 132, and the positioning portion 1321 is formed on the inner wall of the flange 132 at a position corresponding to the recessed portion 1323.

[0051] Specifically, the recessed portion 1323 and the positioning portion 1321 can be formed on the flange 132 simultaneously by stamping. In this way, no additional material is needed during the formation of the positioning portion 1321, thereby helping to reduce the weight of the current collector plate 130 and reduce the processing difficulty. Moreover, the recessed portion 1323 is inwardly recessed relative to the inner wall of the shell 110, so the area of the outer wall of the flange 132 corresponding to the recessed portion 1323 will form a gap with the inner wall of the shell 110. This gap can be used to release welding stress, thereby avoiding the problem of deformation or cracking of the welding area due to stress concentration caused by welding of the flange 132.

[0052] Further, since the stamping operation causes the material in the stamped area to be compressed, thereby causing the thickness to be reduced, the wall thickness of the positioning portion 1321 is generally less than the wall thickness of the welding zone.

[0053] Of course, the positioning portion 1321 can also be formed on the flange 132 by a local thickening method. For example, in another embodiment, the wall thickness of the area where the positioning portion 1321 is located is greater than the wall thickness of the area where the welding zone is located, and the outer wall of the flange 132 is a smooth transition curved surface.

[0054] At this time, the flange 132 does not need to be stamped, so the outer wall of the flange 132, i.e., the side facing the inner wall of the shell 110, is a smooth transition curved surface. In this way, when the flange 132 is attached to the inner wall of the shell 110, a gap is not easily formed between the two, thereby increasing the contact area between the current collector plate 130 and the inner wall of the shell 110 and improving the assembly stability.

[0055] The positioning portion 1321 can abut against the cover plate 140 to position the cover plate 140 in the radial direction of the shell 110. More specifically, in the embodiment, the width of the positioning portion 1321 in the circumferential direction of the flange 132 is greater than or equal to 10 mm. If the width of the positioning portion 1321 is less than 10 mm, the positioning portion 1321 can not sufficiently contact the protruding portion 141 of the cover plate 140 during the subsequent positioning process, which can affect the radial positioning of the cover plate 140.

[0056] Referring to Figure 6 The cover plate 140 includes a protruding portion 141 protruding toward the current collector 130. The protruding portion 141 extends into the shell 110 from the opening of the shell 110 and abuts against the positioning portion 1321 to position the cover plate 140 in the radial direction of the shell 110.

[0057] 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 can increase the structural strength of the cover plate 140. The protruding portion 141 does not require additional material, which can reduce the weight of the cover plate 140 and save costs. 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 toward the battery cell 120. That is, the area of the side of the cover plate 140 away from the battery cell 120 is recessed, and the protruding portion 141 is a columnar shape.

[0058] 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 toward the battery cell 120. That is, the area of the side of the cover plate 140 away from the battery cell 120 is recessed in an annular shape, and the protruding portion 141 is a cylindrical shape.

[0059] Since the height of the welding mark 1322 in the radial direction of the current collector 130 is not higher than the height of the positioning portion 1321, the positioning portions 1321 on both sides can keep the welding mark 1322 afloat. Therefore, when the protruding portion 141 abuts against the positioning portion 1321, the welding mark 1322 can not interfere with the protruding portion 141. Alternatively, the welding mark 1322 can just contact the protruding portion 141, but will not interfere with the abutment between the positioning portion 1321 and the protruding portion 141. As can be seen, the radial positioning of the cover plate 140 is achieved by the side surface of the protruding portion 141 abutting against the positioning portion 1321 of the flange 132, and does not depend on the current collector 130. Therefore, even if the welding mark 1322 is uneven, it will not affect the radial positioning accuracy of the cover plate 140.

[0060] In addition, in the embodiment, the plurality of positioning portions 1321 are arranged at equal intervals along the circumference of the flange 132, and a welding mark 1322 is formed between each two adjacent positioning portions 1321. Therefore, when the positioning portions 1321 are positioned in cooperation with the protruding portion 141, the force applied by the plurality of positioning portions 1321 to the protruding portion 141 makes the force on the protruding portion 141 more balanced, and the positioning effect is better. Moreover, the welding marks 1322 are also distributed at intervals along the circumference of the flange 132, which helps to improve the reliability of the welding between the current collecting disc 130 and the shell 110.

[0061] Please refer again to Figure 3 Since the flange 132 extends between the protruding portion 141 and the inner wall of the shell 110, the cover plate 140 and the current collecting disc 130 can 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 improve the energy density of the battery monomer 100.

[0062] Further, in the embodiment, the disc body 131 is recessed to form an accommodating cavity (not shown) toward the side of the battery cell 120, and an upward protruding structure (not shown) is formed on the side of the disc body 131 away from the battery cell 120, and part of the battery cell 120 is located in the accommodating cavity. It can be seen that 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.

[0063] Moreover, the upward protruding structure protrudes toward the side of the cover plate 140 and can abut against the protruding portion 141 along the axial direction of the shell 110. Therefore, the upward protruding 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.

[0064] Please refer again to Figure 3 and Figure 6 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.

[0065] When assembling the cover plate 140, the protruding portion 141 is first inserted into 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 is realized. It can be seen that the protruding portion 141 does not need to abut against the current collecting disc 130 to position the cover plate 140 in the axial direction, thereby avoiding the cover plate 140 applying axial pressure to the current collecting disc 130 and preventing the flange 132 from being detached 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.

[0066] On the other hand, since the abutting portion 142 abuts on the end face 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 of the shell 110 and the cover plate 140 by using laser seam welding, so that the welding laser can be prevented from penetrating the cover plate 140 in the axial direction and damaging the elements such as the battery cell 120 inside the shell 110.

[0067] Further, in the present embodiment, the outer diameter of the abutting portion 142 is equal to or smaller than the outer diameter of the shell 110 and larger than the inner diameter of the opening.

[0068] When the abutting portion 142 abuts on the end face of the opening of the shell 110, the outer edge of the abutting portion 142 is recessed inwardly compared with 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 with the outer wall of the shell 110, a step can be formed between the outer edge of the abutting portion 142 and the end face 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 is 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 is eliminated, so as to help improve the welding effect.

[0069] The above battery monomer 100, when assembling the cover plate 140, covers the cover plate 140 on the opening of the shell 110, and makes the protruding portion 141 of the cover plate 140 extend into the shell 110 from the opening. The side surface of the protruding portion 141 abuts against the positioning portion 1321 of the flange 132, so that the cover plate 140 can be positioned in the radial direction. Since the welding area of the flange 132 is located between the two adjacent positioning portions 1321, the weld 1322 generated by welding the flange 132 to the inner wall of the shell 110 is also located between the two positioning portions 1321. Moreover, since the height of the weld 1322 in the radial direction of the current collector 130 is not higher than the height of the positioning portion 1321, the weld 1322 can be prevented from interfering with the protruding portion 141 under the support of the positioning portion 1321, or just contacting the protruding portion 141 without affecting the abutment between the positioning portion 1321 and the protruding portion 141. Therefore, even if the weld 1322 is uneven, it will not affect the radial positioning accuracy of the cover plate 140, so as to improve the assembly accuracy of the above battery monomer 100.

[0070] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but it should be considered that any combination of the technical features is within the scope of the present disclosure as long as the combination does not cause contradiction.

[0071] 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 comprising a housing (110), an electrode assembly (120), a current collector plate (130) and a cover plate (140), the housing (110) having an opening at at least one end, characterized in that, The current collector plate (130) comprises a plate body (131) and a flange (132) extending along the periphery of the plate body (131), the flange (132) is formed with a plurality of spaced positioning portions (1321) and welding areas between adjacent two positioning portions (1321) in the circumferential direction, the positioning portions (1321) are protruded on the inner wall of the flange (132), the welding areas are welded with the inner wall of the shell (110) and form welding marks (1322), and the height of the welding mark (1322) is not higher than the height of the positioning portion (1321) in the radial direction of the current collector plate (130); the cover plate (140) comprises a protruding portion (141) protruding towards the current collector plate (130), the protruding portion (141) extends into the shell (110) through the opening and abuts against the positioning portion (1321) to position the cover plate (140) in the radial direction of the shell (110).

2. The battery cell of claim 1, wherein, Part of the flange (132) is recessed inward to form a recess (1323) on the outer wall of the flange (132), and the positioning portion (1321) is formed on the inner wall of the flange (132) corresponding to the recess (1323).

3. The battery cell of claim 2, wherein, The wall thickness of the positioning portion (1321) is smaller than the wall thickness of the welding area.

4. The battery cell of claim 1, wherein, The wall thickness of the area where the positioning portion (1321) is located is greater than the wall thickness of the area where the welding area is located, and the outer wall of the flange (132) is a smooth transition curved surface.

5. The battery cell according to any one of claims 1 to 4, characterized in that, A plurality of positioning portions (1321) are arranged at equal intervals in the circumferential direction of the flange (132), and the welding mark (1322) is formed between each adjacent two positioning portions (1321).

6. The battery cell of claim 1, wherein, The width of the positioning portion (1321) in the circumferential direction of the flange is smaller than the width of the welding area in the circumferential direction of the flange.

7. The battery cell of claim 1, wherein, The width of the positioning portion (1321) in the circumferential direction of the flange is greater than or equal to 10 mm.

8. The battery cell of claim 1, wherein, The height of the positioning portion (1321) in the radial direction of the current collector plate (130) is greater than or equal to 0.3 mm and less than or equal to 2 mm.

9. 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) to make the flange (132) elastically abut against the inner wall of the shell (110).

10. 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 surface of the opening to position the cover plate (140) in the axial direction of the shell (110).

11. The battery cell of claim 10, 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.

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

13. 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) facing away from the battery cell (120), and to form the protrusion (141) on the side of the cover plate (140) facing the battery cell (120).

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

15. The battery cell of claim 14, wherein, The upper convex structure abuts against the protrusion (141) along the axial direction of the shell (110).

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

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

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