Tab connecting structure and connecting method, battery, battery module and electric device

Abstract

The application discloses a tab connecting structure, a tab connecting method, a battery, a battery module and a power utilization device. The tab connecting structure comprises a tab and a connecting piece. The connecting piece comprises a tab connecting part, and a groove is arranged on the tab connecting part. The tab is welded on the tab connecting part. A welding mark of the tab connecting part is formed on the tab. The welding mark of the tab connecting part is at least partially located in the groove in the orthographic projection of the connecting piece. The tab connecting structure provided by the application improves the welding effect of the tab and the connecting piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a tab connecting structure, a tab connecting structure, a battery, a battery module and an electrical equipment. BACKGROUND

[0002] Secondary batteries (for example, lithium batteries) have the advantages of high energy density, high power density, many times of cyclic use, long storage time, etc., and have been widely applied in large and medium-sized electrical equipment such as electric vehicles, electric bicycles and energy storage facilities in recent years.

[0003] At present, the electrode assembly in the secondary battery usually includes a tab and a transition sheet, and the tab and the transition sheet need to be welded together.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] One of the main purposes of the present application is to provide a tab connecting structure, which improves the welding effect of the tab and the transition sheet.

[0006] To achieve the above-mentioned application purposes, the present application adopts the following technical solutions:

[0007] According to a first aspect of the present application, a tab connecting structure is provided, which comprises:

[0008] a transition sheet comprising a tab connecting portion, wherein a groove is arranged on the tab connecting portion;

[0009] a tab welded on the tab connecting portion, wherein a welding mark formed on the tab is welded with the tab connecting portion, and the welding mark in the orthographic projection of the transition sheet at least partially falls into the groove.

[0010] The tab connecting structure provided by the present embodiment has the groove arranged on the tab connecting portion, and after the tab is welded on the tab connecting portion, the welding mark on the tab at least partially falls into the groove in the orthographic projection of the transition sheet, that is, at least part of the groove serves as the welding position of the transition sheet and the tab. The position of the groove arranged on the transition sheet has a smaller thickness, which makes it easier to ultrasonic weld the tab and the transition sheet, and improves the welding effect of the tab and the transition sheet.

[0011] According to an embodiment of the present application, the tab completely covers the groove.

[0012] The tab connecting structure provided by the present embodiment has the groove arranged on the tab connecting portion, and after the tab is welded on the tab connecting portion, the welding mark on the tab at least partially falls into the groove in the orthographic projection of the transition sheet, that is, at least part of the groove serves as the welding position of the transition sheet and the tab. The position of the groove arranged on the transition sheet has a smaller thickness, which makes it easier to ultrasonic weld the tab and the transition sheet, and improves the welding effect of the tab and the transition sheet.

[0013] According to an embodiment of the present application, the depth of the groove is less than 50% of the thickness of the tab connecting portion.

[0014] The tab connecting structure provided by the embodiment prevents the depth of the groove from being too large to reduce the strength of the adapter piece by making the depth of the groove less than 50% of the thickness of the tab connecting portion.

[0015] According to an embodiment of the present application, the tab connecting structure further comprises:

[0016] A protection piece is arranged on the side of the tab away from the tab connecting portion, and at least part of the orthographic projection of the protection piece on the adapter piece is located in the groove.

[0017] The tab connecting structure provided by the embodiment improves the sliding misalignment of the protection piece during welding by placing the tab above the groove first, then placing the protection piece above the tab and slightly aligning the protection piece with the groove, covering at least part of the groove with the tab, and making at least part of the orthographic projection of the protection piece on the adapter piece located in the groove. When the ultrasonic welding head acts on the protection piece, the bottom of the protection piece drives at least part of the tab into the groove, thereby improving the sliding misalignment of the protection piece during welding through the guiding effect of the groove.

[0018] According to an embodiment of the present application, the orthographic projection of the protection piece on the adapter piece is located in the groove.

[0019] The tab connecting structure provided by the embodiment improves the sliding misalignment of the protection piece during welding by making the orthographic projection of the protection piece on the adapter piece located in the groove, i.e., the size of the protection piece is less than or equal to the size of the groove. When the ultrasonic welding head acts on the protection piece, the bottom of the protection piece drives at least part of the tab into the groove, thereby making the protection piece better located above the groove through the guiding effect of the groove, and further improving the guiding effect of the groove and the sliding misalignment of the protection piece during welding.

[0020] According to an embodiment of the present application, the shape of the protection piece matches the shape of the groove.

[0021] The tab connecting structure provided by the embodiment improves the sliding misalignment of the protection piece during welding by making the shape of the protection piece match the shape of the groove, i.e., the shape of the protection piece is consistent with the shape of the groove, thereby making the gap between the protection piece and the side wall of the groove in the circumferential direction consistent or substantially consistent after the protection piece is located above the groove through the guiding effect of the groove, and further improving the guiding effect of the groove and the sliding misalignment of the protection piece during welding.

[0022] According to an embodiment of the present application, the depth of the groove is greater than 30% of the sum of the thickness of the tab and the thickness of the protective sheet.

[0023] The tab connecting structure provided by the embodiment can accommodate the vibration deformation of the tab, ensure that the tab is completely pressed into the groove, and ensure the stability of the connecting structure of the adapter sheet and the tab.

[0024] According to an embodiment of the present application, the depth of the groove is less than 50% of the sum of the thickness of the tab and the thickness of the protective sheet.

[0025] The tab connecting structure provided by the embodiment can prevent the depth of the groove from being too large and reduce the strength of the adapter sheet.

[0026] According to an embodiment of the present application, the groove comprises a bottom surface and a transition surface surrounding the bottom surface, the transition surface connecting the bottom surface and a top surface of the tab connecting portion; the depth of the groove at the transition surface increases from an edge region of the groove toward a central region.

[0027] The tab connecting structure provided by the embodiment can better guide the protective sheet, so that the protective sheet can be better pressed into the groove when the ultrasonic welding head acts on the protective sheet. In addition, the side wall of the groove is inclined, which avoids the opening edge of the groove from extruding the tab and causing the tab to tear, thereby improving the reliability of the tab connecting structure.

[0028] According to an embodiment of the present application, the protective sheet comprises a first surface and a second surface opposite to each other, and a side surface connecting the first surface and the second surface, the side surface being parallel to the transition surface.

[0029] The tab connecting structure provided by the embodiment can improve the pressing effect of the protective sheet on the tab at the transition surface after the bottom of the protective sheet drives at least part of the tab to be pressed into the groove, thereby improving the stability of the protective sheet after the tab is pressed. At the same time, the side surface of the protective sheet forms a large surface contact with the tab, thereby avoiding a large extrusion stress on the tab and causing the tab to crack, and improving the reliability of the tab welding.

[0030] According to a second aspect of the present application, a tab connecting method is provided, the tab connecting method comprising:

[0031] The adapter piece comprises a tab connecting portion, and a groove is arranged on the tab connecting portion;

[0032] The tab is arranged on the tab connecting portion, and the tab is welded to the tab connecting portion; after welding, a welding mark is formed on the tab, and the projection of the adapter piece on the welding mark at least partially falls into the groove.

[0033] The tab connecting method provided by the embodiment comprises the following steps: arranging a groove on a tab connecting portion; and arranging a tab on the tab connecting portion, and welding the tab to the tab connecting portion; after welding, a welding mark is formed on the tab, and the projection of the adapter piece on the welding mark at least partially falls into the groove.

[0034] According to an embodiment of the present application, after the tab is arranged on the tab connecting portion, before the tab is welded to the tab connecting portion, the tab connecting method further comprises the following steps:

[0035] A protection piece is arranged on the side of the tab away from the tab connecting portion, and the protection piece, the tab and the tab connecting portion are welded; after welding, a welding mark is formed on the protection piece, and the projection of the adapter piece on the welding mark at least partially falls into the groove.

[0036] The tab connecting method provided by the embodiment comprises the following steps: arranging a groove on a tab connecting portion; and arranging a tab on the tab connecting portion, and welding the tab to the tab connecting portion; after welding, a welding mark is formed on the tab, and the projection of the adapter piece on the welding mark at least partially falls into the groove.

[0037] According to a third aspect of the present application, a battery is provided, which comprises the tab connecting structure described above.

[0038] The battery provided by the embodiment comprises the following steps: arranging a groove on a tab connecting portion of an adapter piece; and arranging a tab on the tab connecting portion, and welding the tab to the tab connecting portion; after welding, a welding mark is formed on the tab, and the projection of the adapter piece on the welding mark at least partially falls into the groove.

[0039] According to a fourth aspect of the present application, a battery module is provided, which comprises the battery described above.

[0040] The battery module provided by the embodiment is provided with a groove on the lug connecting portion of the adapter plate of the battery, and after the lug is welded on the lug connecting portion, the welding mark on the lug at least partially falls into the groove in the orthographic projection of the adapter plate, that is, at least part of the groove serves as the welding position of the adapter plate and the lug, the position where the groove is arranged on the adapter plate has a small thickness, the lug is more easily ultrasonic welded with the adapter plate, the welding effect of the lug and the adapter plate is improved, and the reliability of the battery module is improved.

[0041] According to a fifth aspect of the present application, a power consuming device is provided, which comprises the battery module described above.

[0042] The power consuming device provided by the embodiment is provided with a groove on the lug connecting portion of the adapter plate of the battery, and after the lug is welded on the lug connecting portion, the welding mark on the lug at least partially falls into the groove in the orthographic projection of the adapter plate, that is, at least part of the groove serves as the welding position of the adapter plate and the lug, the position where the groove is arranged on the adapter plate has a small thickness, the lug is more easily ultrasonic welded with the adapter plate, the welding effect of the lug and the adapter plate is improved, and the reliability of the power consuming device is improved.

[0043] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0044] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0045] Figure 1 A front view of the lug connecting structure provided by an embodiment of the present application;

[0046] Figure 2 A rear view of the lug connecting structure provided by an embodiment of the present application;

[0047] Figure 3 A front view of the lug connecting structure provided by another embodiment of the present application;

[0048] Figure 4 A schematic view of the adapter plate provided by an embodiment of the present application;

[0049] Figure 5 A top view of the adapter plate provided by an embodiment of the present application;

[0050] Figure 6 A schematic view of the adapter plate provided by another embodiment of the present application;

[0051] Figure 7 A sectional view of the lug connecting structure provided by another embodiment of the present application;

[0052] Figure 8 A flowchart of a tab connecting method is provided for an embodiment of the present application.

[0053] BRIEF DESCRIPTION OF DRAWINGS

[0054] 10, cell body;

[0055] 20, tab;

[0056] 30, adapter piece; 310, tab connecting portion; 3110, top surface; 320, groove; 3210, bottom surface; 3220, transition surface;

[0057] 40, protective sheet; 410, first surface; 420, second surface; 430, side surface;

[0058] 50, weld mark. DETAILED DESCRIPTION

[0059] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus a detailed description of them will not be repeated.

[0060] Embodiments of the present application first provide a tab connecting structure, as shown in Figure 1 、 Figure 2 、 Figure 4 and Figure 5 , which includes a tab 20 and an adapter piece 30, the adapter piece 30 including a tab connecting portion 310, the tab connecting portion 310 being provided with a groove 320; the tab 20 being welded to the tab connecting portion 310, the tab 20 being formed with a weld mark 50 welded to the tab connecting portion 310, the weld mark 20 being at least partially within the projection of the adapter piece 30.

[0061] The tab connecting structure provided by the present application, the tab connecting portion 310 is provided with a groove 320, the tab 20 is formed with a weld mark 20 after being welded to the tab connecting portion 310, the weld mark 20 being at least partially within the projection of the adapter piece 30, i.e. at least part of the groove 320 serves as the welding position of the adapter piece 30 and the tab 20, the groove 320 is provided on the adapter piece 30 at a position with a small thickness, which makes it easier to ultrasonic weld the tab 20 and the adapter piece 30, and improves the welding effect of the tab 20 and the adapter piece 30.

[0062] In an embodiment of the present application, the tab 20 completely covers the groove 320. The tab 20 completely covers the groove 320 after being placed above the groove 320, so that the edges of the tab 20 are not located in the groove 320, and only the bottom surface of the groove 320 serves as the welding position of the adapter tab 30 and the tab 20, which further facilitates the ultrasonic welding of the tab 20 and the adapter tab 30 and improves the welding effect of the tab 20 and the adapter tab 30.

[0063] In an embodiment of the present application, as shown in Figure 3 the tab connecting structure further comprises a protection sheet 40. The protection sheet 40 is arranged on the side of the tab 20 away from the tab connecting portion 310, and at least part of the orthographic projection of the protection sheet 40 on the adapter tab 30 is located in the groove 320. When the tab 20 is ultrasonically welded on the tab connecting portion 310 by the protection sheet 40, the tab 20 is first placed above the groove 320, then the protection sheet 40 is placed above the tab 20 and slightly aligned with the groove 320, the tab 20 covers at least part of the groove 320,

[0064] and at least part of the orthographic projection of the protection sheet 40 on the adapter tab 30 is located in the groove 320. When the ultrasonic welding head acts on the protection sheet 40, the bottom of the protection sheet 40 drives at least part of the tab 20 to press into the groove 320, so that the guiding effect of the groove 320 is improved to prevent the protection sheet 40 from sliding and mispositioning during welding. Meanwhile, the groove 320 also provides a space for accommodating the vibration and deformation of the tab 20.

[0065] In an embodiment of the present application, the tab 20 completely covers the groove 320. The tab 20 completely covers the groove 320 after being placed above the groove 320, so that the edges of the tab 20 are not located in the groove 320, i.e. the tab 20 completely blocks between the protection sheet 40 and the groove 320, thereby avoiding that the protection sheet 40 is not completely pressed on the tab 20 and improving the reliability of the tab 20 after being welded with the tab connecting portion 310.

[0066] In an embodiment of the present application, the orthographic projection of the protection sheet 40 on the adapter tab 30 is located in the groove 320. By locating the orthographic projection of the protection sheet 40 on the adapter tab 30 in the groove 320, i.e. the size of the protection sheet 40 is less than or equal to the size of the groove 320, when the ultrasonic welding head acts on the protection sheet 40, the bottom of the protection sheet 40 drives the tab 20 to press into the groove 320, so that the protection sheet 40 is better located above the groove 320 by the guiding effect of the groove 320, the side wall of the groove 320 guides and limits the protection sheet 40 in the circumferential direction, which further improves the guiding effect of the groove 320 and further improves the sliding and mispositioning of the protection sheet 40 during welding.

[0067] The shape of the protective plate 40 matches the shape of the groove 320. By matching the shape of the protective plate 40 with the shape of the groove 320, that is, making the shapes of the protective plate 40 and the groove 320 consistent, after the protective plate 40 is positioned above the groove 320 by the guiding effect of the groove 320, the gap between the protective plate 40 and the side wall of the groove 320 in the circumferential direction can be consistent or substantially consistent. This improves the guiding effect of the groove 320, allowing the protective plate 40 to be completely positioned in the groove 320, and further improving the sliding misalignment of the protective plate 40 during welding.

[0068] Among them, such as Figure 4 and Figure 5 As shown, the groove 320 can be trapezoidal in shape, and the protective plate 40 can also be trapezoidal in shape. Of course, the groove 320 can also be rectangular, circular, elliptical, triangular, polygonal, cleft or irregular in shape, etc., as long as the shape of the protective plate 40 matches the shape of the groove 320; of course, the shape of the protective plate 40 and the shape of the groove 320 can also not match, for example, the groove 320 is trapezoidal and the protective plate 40 is rectangular, as long as the protective plate 40 can be located on the groove 320 and function as a conductor through the groove 320. This application does not limit this, and all changes in the shape of the groove 320 and the protective plate 40 are within the protection scope of this application.

[0069] The depth of the groove 320 is greater than 30% of the sum of the thicknesses of the tab 20 and the protective plate 40. By making the depth of the groove 320 greater than 30% of the sum of the thicknesses of the tab 20 and the protective plate 40, the groove 320 provides a space to accommodate the deformation of the tab 20 after vibration, ensuring that the tab 20 is completely pressed into the groove 320 and guaranteeing the stability of the connection structure between the adapter plate 30 and the tab 20. For example, the depth of the groove 320 may be greater than 30%, 35%, 40%, or 45% of the sum of the thicknesses of the tab 20 and the protective plate 40, etc., which will not be listed here; of course, the depth of the groove 320 may also be less than 30% of the sum of the thicknesses of the tab 20 and the protective plate 40, which is not a limitation of this application.

[0070] The depth of the groove 320 is less than 50% of the sum of the thicknesses of the tab 20 and the protective plate 40. By making the depth of the groove 320 less than 50% of the sum of the thicknesses of the tab 20 and the protective plate 40, the depth of the groove 320 is prevented from being too large, which would reduce the strength of the adapter plate 30. For example, the depth of the groove 320 is less than 50%, 45%, 40%, 35% of the sum of the thicknesses of the tab 20 and the protective plate 40, etc., which will not be listed here; of course, the depth of the groove 320 can also be greater than 50% of the sum of the thicknesses of the tab 20 and the protective plate 40, which is not limited in this application.

[0071] In the thickness direction of the adapter tab 30, the depth of the groove 320 is greater than 30% of the thickness of the lug 20 and the protective sheet 40 and less than 50% of the thickness of the lug 20 and the protective sheet 40. The depth of the groove 320 can provide a space for accommodating the vibration deformation of the lug 20, so as to ensure that the lug 20 is completely pressed into the groove 320 and the stability of the connection structure of the adapter tab 30 and the lug 20. In addition, the depth of the groove 320 is prevented from being too large, so as to reduce the strength of the adapter tab 30.

[0072] In the thickness direction of the adapter tab 30, the depth of the groove 320 is less than 50% of the thickness of the lug connecting portion 310. The depth of the groove 320 is prevented from being too large, so as to reduce the strength of the adapter tab 30. For example, the depth of the groove 320 is less than 50%, 45%, 40%, 35% or the like of the thickness of the lug connecting portion 310, which is not listed one by one in the present application. Of course, the depth of the groove 320 can be greater than 50% of the thickness of the lug connecting portion 310, which is not limited in the present application.

[0073] In the thickness direction of the adapter tab 30, the depth of the groove 320 is greater than 30% of the thickness of the lug connecting portion 310. The depth of the groove 320 can provide a space for accommodating the vibration deformation of the lug 20, so as to ensure that the lug 20 is completely pressed into the groove 320 and the stability of the connection structure of the adapter tab 30 and the lug 20. For example, the depth of the groove 320 is greater than 30%, 35%, 40%, 45% or the like of the thickness of the lug connecting portion 310, which is not listed one by one in the present application. Of course, the depth of the groove 320 can be less than 30% of the thickness of the lug connecting portion 310, which is not limited in the present application.

[0074] In the thickness direction of the adapter tab 30, the depth of the groove 320 is greater than 30% of the thickness of the lug connecting portion 310 and less than 50% of the thickness of the lug connecting portion 310. The depth of the groove 320 can provide a space for accommodating the vibration deformation of the lug 20, so as to ensure that the lug 20 is completely pressed into the groove 320 and the stability of the connection structure of the adapter tab 30 and the lug 20. In addition, the depth of the groove 320 is prevented from being too large, so as to reduce the strength of the adapter tab 30.

[0075] In an embodiment of the present application, as shown in FIG. 3, the groove 320 includes a bottom surface 3210 and a transition surface 3220 surrounding the bottom surface 3210, and the transition surface 3220 connects the bottom surface 3210 and the top surface 3110 of the lug connecting portion 310. In the thickness direction of the adapter tab 30, the depth of the groove 320 is greater than 30% of the thickness of the lug connecting portion 310 and less than 50% of the thickness of the lug connecting portion 310. Figure 6

[0076] ​Specifically, the transition surface 3220 can be regarded as a side wall of the groove 320, and the depth of the groove 320 at the transition surface 3220 increases from the edge region of the groove 320 towards the central region, that is, the side wall of the groove 320 is a slope; by increasing the depth of the groove 320 at the transition surface 3220 from the edge region of the groove 320 towards the central region, on the one hand, the guiding effect on the protective sheet 40 can be better, so that when the ultrasonic welding head acts on the protective sheet 40, the protective sheet 40 can be better pressed into the groove 320; on the other hand, the side wall of the groove 320 is a slope, which avoids that the extrusion force of the opening edge of the groove 320 on the tab 20 is too large, causing the tab 20 to tear, thereby improving the reliability of the tab connection structure.

[0077] In the above embodiments, the depth of the groove 320 is the depth of the bottom surface 3210 of the groove 320.

[0078] When the depth of the groove 320 at the transition surface 3220 increases from the edge region of the groove 320 towards the central region, so that the side wall of the groove 320 is a slope, the slope can be an arc surface protruding towards the outer periphery of the opening of the groove 320, or the slope is an arc surface recessed towards the bottom surface of the groove 320, or the slope is a continuous concave-convex slope, which is not limited in the present application.

[0079] In an embodiment of the application, as shown in Figure 7 The protective sheet 40 includes opposite first and second surfaces 410 and 520 and a side surface 430 connecting the first and second surfaces 410 and 420, and the side surface 430 is parallel to the transition surface 3220 of the groove 320. By making the side surface 430 of the protective sheet 40 parallel to the transition surface 3220 of the groove 320, after the bottom of the protective sheet 40 drives at least part of the tab 20 to be pressed into the groove 320, the pressing effect of the protective sheet 40 on the tab 20 at the transition surface 3220 is improved, and the stability of the protective sheet 40 after pressing the tab 20 is improved; at the same time, the side surface 430 of the protective sheet 40 forms a larger surface contact with the tab 20, thereby avoiding the case that the tab 20 is cracked due to a large extrusion stress, and improving the reliability of the welding of the tab 20.

[0080] The side surface 430 of the protective sheet 40 is parallel or partially parallel to the transition surface 3220 of the groove 320 in the circumferential direction; of course, the side surface 430 of the protective sheet 40 and the transition surface 3220 of the groove 320 can also be arranged non-parallelly, for example, there is a certain included angle, for example, 5°-15°, between the side surface 430 and the transition surface 3220, which is not limited in the present application.

[0081] The side surface 430 of the protection sheet 40 can be formed by connecting two sub-sides with different inclined angles, for example, the sub-side connected with the second surface 420 and corresponding to the transition surface 3220 has the same inclined angle as the transition surface 3220, that is, the sub-side is parallel to the transition surface 3220; the inclined angle of the sub-side not corresponding to the transition surface 3220 can be 90°, that is, the sub-side is perpendicular to the connected first surface 410. Of course, the side surface 430 of the protection sheet 40 can be formed by connecting three, four, five or more sub-sides with different inclined angles, as long as the sub-side corresponding to the transition surface 3220 is parallel to the transition surface 3220, which is not limited in the application.

[0082] In an embodiment of the application, a chamfer can be arranged on the opening edge of the groove 320, that is, a chamfer is arranged at the connection position of the transition surface 3220 of the groove 320 and the top surface 3110 of the tab connecting portion 310, and the chamfer surface is a plane or an arc surface. By arranging the chamfer on the opening edge of the groove 320, the extrusion force of the opening edge of the groove 320 on the tab 20 is avoided to be too large, so that the tab 20 is prevented from being torn, and the reliability of the tab connecting structure is improved.

[0083] In an embodiment of the application, a chamfer can be arranged on the opening edge of the groove 320, that is, a chamfer is arranged at the connection position of the transition surface 3220 of the groove 320 and the top surface 3110 of the tab connecting portion 310, and the chamfer surface is a plane or an arc surface. By arranging the chamfer on the opening edge of the groove 320, the extrusion force of the opening edge of the groove 320 on the tab 20 is avoided to be too large, so that the tab 20 is prevented from being torn, and the reliability of the tab connecting structure is improved.

[0084] The embodiment of the application further provides a tab connecting method, as shown in the figure, the tab connecting method comprises the following steps. Figure 8

[0085] The step S100 comprises the following steps.

[0086] The step S200 comprises the following steps.

[0087] The tab connecting method provided by the application has the groove arranged on the tab connecting portion, when the tab is welded on the tab connecting portion, the welding mark on the tab at least partially falls into the groove in the orthographic projection of the adapter sheet, that is, at least part of the groove is used as the welding position of the adapter sheet and the tab, the position of the groove arranged on the adapter sheet has a small thickness, so that the tab is more easily ultrasonic welded with the adapter sheet, and the welding effect of the tab and the adapter sheet is improved.

[0088] ​In an embodiment of the present application, after the tab is arranged on the tab connecting portion, before the tab and the tab connecting portion are welded, the tab connecting method further comprises: arranging a protective sheet on the side of the tab away from the tab connecting portion, and welding the protective sheet, the tab and the tab connecting portion; after welding, a welding mark is formed on the protective sheet, and at least part of the orthographic projection of the welding mark on the adapter sheet is located in the groove. When the tab is ultrasonically welded on the tab connecting portion by the protective sheet, the tab is first placed above the groove, then the protective sheet is placed above the tab, and the protective sheet is slightly aligned with the groove, the tab covers at least part of the groove, and at least part of the orthographic projection of the protective sheet on the adapter sheet is located in the groove. When the ultrasonic welding head acts on the protective sheet, the bottom of the protective sheet drives at least part of the tab to press into the groove, thereby improving the sliding misalignment during welding of the protective sheet through the guiding effect of the groove.

[0089] In the embodiment of the tab connecting method provided in the present application, more details and technical effects of the welding of the tab and the adapter sheet can be found in the detailed description of the above-mentioned embodiments of the tab connecting structure, which will not be repeated here.

[0090] The embodiments of the present application also provide a battery comprising the above-mentioned tab connecting structure. Specifically, as shown in Figure 1 The battery comprises two battery cells, each of which comprises a battery cell body 10 and a tab 20 connected to the battery cell body 10. The positive tabs of the two battery cells are connected together by the above-mentioned tab connecting structure, so as to be connected to the positive pole of the battery through the pole connecting portion; the negative tabs of the two battery cells are connected together by the above-mentioned tab connecting structure, so as to be connected to the negative pole of the battery through the pole connecting portion; and the battery can be a lithium ion battery.

[0091] The battery provided in the present application is provided with a groove on the tab connecting portion of the adapter sheet, and after the tab is welded on the tab connecting portion, the welding mark on the tab falls at least partially into the orthographic projection of the groove, that is, at least part of the groove serves as the welding position of the adapter sheet and the tab. The thickness of the position where the groove is arranged on the adapter sheet is small, which makes it easier to ultrasonically weld the tab and the adapter sheet, and improves the welding effect of the tab and the adapter sheet. The reliability of the battery is improved.

[0092] More details and beneficial effects of the battery of the present application can be found in the above-mentioned description of the embodiments of the tab connecting structure, which will not be repeated here.

[0093] The battery module provided by the application has the following advantages: the lug connecting portion of the adapter tab of the battery is provided with a groove, after the lug is welded on the lug connecting portion, the welding mark on the lug falls at least partially within the projection of the adapter tab, that is, at least part of the groove serves as the welding position of the adapter tab and the lug, the position where the groove is arranged on the adapter tab has a small thickness, the lug is more easily ultrasonic welded with the adapter tab, the welding effect of the lug and the adapter tab is improved, and the reliability of the battery module is improved.

[0094] More details and advantages of the battery module of the application will be described in the above description of the lug connecting structure, and will not be described here.

[0095] The power utilization device provided by the application has the following advantages: the lug connecting portion of the adapter tab of the battery is provided with a groove, after the lug is welded on the lug connecting portion, the welding mark on the lug falls at least partially within the projection of the adapter tab, that is, at least part of the groove serves as the welding position of the adapter tab and the lug, the position where the groove is arranged on the adapter tab has a small thickness, the lug is more easily ultrasonic welded with the adapter tab, the welding effect of the lug and the adapter tab is improved, and the reliability of the power utilization device is improved.

[0096] More details and advantages of the power utilization device of the application will be described in the above description of the lug connecting structure, and will not be described here.

[0097] In the embodiments of the application, the term “plurality” refers to two or more, unless otherwise explicitly limited. The terms “mounting”, “connecting”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, “connecting” can be fixed connection, or detachable connection, or integral connection; “connecting” can be direct connection, or indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0098] In the description of the embodiments of the application, it should be understood that the positions or location relationships indicated by the terms “upper”, “lower” and the like are based on the positions or location relationships shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular position, therefore, it cannot be understood as a limitation on the embodiments of the application.

[0099] In the description of the application, the description of the term "one embodiment" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples.

[0100] The above is only the preferred embodiment of the application, and is not intended to limit the application. The application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A tab connecting structure characterized by comprising: include: The adapter includes a tab connection portion, wherein the tab connection portion is provided with a groove; The electrode tab is ultrasonically welded to the side of the electrode tab connection portion where the groove is provided. A weld mark is formed on the electrode tab for welding to the electrode tab connection portion. The weld mark at least partially falls into the groove in the orthogonal projection of the adapter piece. The depth of the groove is less than 50% of the thickness of the electrode tab connection portion. A protective plate is disposed on the side of the electrode tab opposite to the electrode tab connection portion, and at least a portion of the orthographic projection of the protective plate on the adapter piece is located in the groove; the groove includes a bottom surface and a transition surface surrounding the bottom surface, the transition surface connecting the bottom surface and the top surface of the electrode tab connection portion; the depth of the groove increases from the edge region of the groove toward the center region at the transition surface; the protective plate includes a first surface and a second surface facing away from each other and a side surface connecting the first surface and the second surface, the side surface being parallel to the transition surface; the protective plate is ultrasonically welded to the electrode tab and the adapter piece, and at least a portion of the weld mark on the protective plate falls into the groove in the orthographic projection of the adapter piece.

2. The tab connection structure according to claim 1, characterized by The tab completely covers the groove.

3. The tab connection structure according to claim 1, wherein The orthographic projection of the protective plate onto the adapter plate is located in the groove.

4. The tab connection structure according to claim 3, wherein The shape of the protective sheet matches the shape of the groove.

5. The tab connection structure according to claim 1, wherein The depth of the groove is greater than 30% of the sum of the thickness of the tab and the protective sheet.

6. The tab connecting structure according to claim 1 or 5, characterized by The depth of the groove is less than 50% of the sum of the thickness of the tab and the protective sheet.

7. A tab connecting method characterized by, include: An adapter is provided, the adapter including a tab connection portion, the tab connection portion having a groove; An electrode tab is disposed on the side of the electrode tab connection portion where the groove is provided. A protective plate is disposed on the side of the electrode tab opposite to the electrode tab connection portion. The protective plate, the electrode tab, and the electrode tab connection portion are ultrasonically welded. After welding, a weld mark is formed on the protective plate, and the weld mark at least partially falls into the groove in the orthographic projection of the adapter plate. The depth of the groove is less than 50% of the thickness of the electrode tab connection portion. The groove includes a bottom surface and a transition surface surrounding the bottom surface, and the transition surface connects the bottom surface and the top surface of the electrode tab connection portion. The depth of the groove increases at the transition surface from the edge region of the groove toward the center region. The protective plate includes a first surface and a second surface facing away from each other, and a side surface connecting the first surface and the second surface, and the side surface is parallel to the transition surface.

8. A battery, characterized by Includes the tab connection structure as described in any one of claims 1-6.

9. A battery module, characterized by Includes the battery as described in claim 8.

10. An electric device, characterized by Includes the battery module as described in claim 9.

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