Collecting member for secondary battery, and secondary battery
By introducing tab protection plates and connectors into the current collector of the secondary battery, the problems of pressing consistency and narrow process window during the welding process of the tab and the current collector are solved, resulting in higher assembly efficiency and product yield, and improving the adaptability and compatibility of the secondary battery.
Patent Information
- Application Number
- CN202520367493.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-04
AI Technical Summary
Existing secondary batteries suffer from poor bonding consistency and a narrow process window during the welding process between the tabs and current collectors, which makes the edges of the tabs prone to weld cracks, resulting in scrapped electrode components and cost losses.
Design a current collector for a secondary battery, including a tab protection plate and a connector. There is a gap between the tab protection plate and the tab connector for the tab to pass through. The tab protection plate improves the consistency of pressing and widens the process window for laser welding.
It improves the consistency of tab pressing and the process window for welding, reduces the risk of edge cracking of tabs, improves assembly efficiency and product yield, and enhances the adaptability and compatibility of products.
Smart Images
Figure CN223956777U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of secondary batteries, in particular to a current collecting member of a secondary battery and a secondary battery. BACKGROUND
[0002] In the assembly process of a secondary battery, laser welding process is usually used multiple times. After the tab of the electrode assembly is collected by ultrasonic welding, laser welding is used in the welding area of the tab and the current collecting member. However, the laser welding step has the problems of poor consistency of pressing and narrow process window. The poor consistency of pressing refers to that when the welding tool presses the collected tab against the surface of the adapter piece, the part not pressed by the tool is cold connected with the adapter piece, and there is a gap which is easy to cause virtual welding of the tab. The narrow process window refers to that due to strict requirements on the welding process parameter tolerance, after the appropriate process parameters are adjusted, due to the small tolerance, if the power of the laser equipment fluctuates, the laser energy of the equipment will fluctuate, and then virtual welding or overwelding will occur. The existence of the above two problems makes the edge of the tab prone to welding cracks. Once this happens, the electrode assembly and the current collecting member will be scrapped, resulting in great cost loss. CONTENT OF THE UTILITY MODEL
[0003] The present application provides a current collecting member of a secondary battery and a secondary battery to solve the above technical problems, which can improve the consistency of pressing of the tab and widen the process window of tab welding.
[0004] The technical solution adopted by the present application to solve the above technical problems is a current collecting member of a secondary battery, comprising a pole connecting part and a tab connecting part, wherein the pole connecting part is used for conductive connection with a pole of a secondary battery; the tab connecting part comprises a tab connecting piece, a tab protection piece and a connecting piece, the tab connecting piece is connected with the pole connecting part, the tab protection piece is connected with the tab connecting piece through the connecting piece, and the tab protection piece and the tab connecting piece have a gap therebetween for the tab to pass through.
[0005] In an embodiment of the present application, the tab protection piece comprises a welding part and a support part, the support part is arranged at at least one side of the welding part, and the support part is arranged obliquely relative to the welding part in a direction away from the tab connecting piece.
[0006] In an embodiment of the present application, the welding part has a first side, the tab is configured to enter the gap from the first side, and the first side is provided with the support part.
[0007] In an embodiment of the present application, the support part is arranged around the welding part, and the support part and the welding part jointly form a groove.
[0008] In an embodiment of the present application, the surface of the tab protection sheet away from the tab connecting sheet comprises a rough surface, which is used to reduce laser high reflection.
[0009] In an embodiment of the present application, the connecting piece has a first end and a second end, the first end is connected with the tab protection sheet, and the second end is connected with the tab connecting sheet, the connecting piece and the tab connecting sheet have an included angle towards the gap, and the included angle ranges from 45 degrees to 90 degrees.
[0010] In an embodiment of the present application, the height of the gap between the tab protection sheet and the tab connecting sheet is 1.5-3 mm.
[0011] In an embodiment of the present application, the tab protection sheet has a first side away from the tab connecting part, and the connecting piece is arranged close to the first side.
[0012] The present application further provides a secondary battery, which comprises an electrode assembly and the current collecting member as described above, the electrode assembly comprises a tab, the tab is arranged in the gap, and the tab protection sheet, the tab and the tab connecting sheet are welded.
[0013] In an embodiment of the present application, the tab comprises a welding mark area and a bending area, the tab protection sheet comprises a welding part and a supporting part, the supporting part is arranged at at least one side of the welding part, the supporting part is arranged obliquely relative to the welding part and away from the tab connecting sheet, the welding part is welded with the welding mark area, and the supporting part abuts against the bending area.
[0014] The current collecting member of the present application is provided with a tab protection sheet on the tab connecting sheet, and the tab protection sheet and the tab connecting sheet have a gap for the tab to pass through. When laser welding is performed, the tab is pressed and covered by the tab protection sheet, thereby improving the pressing consistency of the tab. At the same time, the tab protection sheet is welded with the tab, so that the process window of the laser welding device is larger, and the problem that too large power will cause the edge of the tab to break and too small power will cause the welding to be not firm is avoided, which is beneficial to improve the assembly efficiency and product yield. In addition, the use of the tab protection sheet makes the process window of the energy, focus and welding mode of the laser welding larger, and the process compatibility is better, which can be applied to various welding scenes and improves the adaptability of the product. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings, in which:
[0016] Figure 1 is a schematic perspective view of a current collecting member of a secondary battery according to an embodiment of the present application;
[0017] Figure 2 is a schematic perspective view of a current collecting member of a secondary battery according to an embodiment of the present application; Figure 1 is a schematic enlarged view of region A in
[0018] Figure 3 is a schematic perspective view of a current collecting member of a secondary battery according to an embodiment of the present application; Figure 1 is a front view of the current collecting member according to the embodiment shown in
[0019] Figure 4 is a schematic perspective view of a current collecting member and an electrode assembly according to an embodiment of the present application;
[0020] Figure 5 is a schematic perspective view of a current collecting member of a secondary battery according to an embodiment of the present application; Figure 4 is a schematic enlarged view of region B in
[0021] Figure 6 is a schematic perspective view of a current collecting member of a secondary battery according to an embodiment of the present application; Figure 4 is a schematic perspective view of a current collecting member of a secondary battery according to an embodiment of the present application;
[0022] Figure 7 is a schematic perspective view of a current collecting member and an electrode assembly according to an embodiment of the present application; Figure 4 is a schematic perspective view of a current collecting member and an electrode assembly according to an embodiment of the present application;
[0023] Figure 8 is a front view of the current collecting member according to the embodiment shown in Figure 7
[0024] is a front view of the current collecting member according to the embodiment shown in Figure 9 Figure 7 is a front view of the current collecting member according to the embodiment shown in
[0025] Figure 10 Figure 7 is a front view of the current collecting member according to the embodiment shown in DETAILED DESCRIPTION
[0026] In order to make the above-mentioned objects, features and advantages of the present application more clear and easily understood, the detailed description of the specific embodiments of the present application will be given below with reference to the accompanying drawings.
[0027] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application, however, can be practiced in a variety of ways other than those specifically described herein, and the present application is not limited to the specific embodiments described below.
[0028] As used in the present application and claims, unless the context clearly indicates otherwise, the words "a," "an," "the," and / or "said" are not limited in scope to refer only to the singular, but can also include the plural unless the context clearly indicates otherwise. Generally, the terms "comprises" and "comprising" are not used to limit the method or device to only include the steps or elements explicitly mentioned, but other steps or elements can also be included.
[0029] In the description of the present application, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.
[0030] In addition, it needs to be noted that the use of "first", "second" and the like to limit the parts, only for the convenience of distinguishing the corresponding parts, such as no further declaration, the above words have no special meaning, therefore, it cannot be understood as a limitation on the scope of protection of the present application. In addition, although the terms used in the present application are selected from the commonly known and used terms, some terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and the detailed meaning of each term is explained in the relevant part of the description. In addition, the present application is required to be understood not only by the actual terms used, but also by the meaning implied by each term.
[0031] Hereinafter, the embodiments of the present application will be described based on the drawings. However, the embodiments shown below are examples of the current collector for secondary battery and the secondary battery for embodying the technical idea of the present application, and the current collector for secondary battery and the secondary battery of the present application are not specific to the following content. Furthermore, in order to easily understand the scope of the claims, the numbers corresponding to the components shown in the embodiments are assigned to the components shown in the "claims" and "content of the utility model" columns. However, the components shown in the claims are by no means specific to the components of the embodiments. In particular, the dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments, and the like, if not specifically described, are not intended to limit the scope of the present application to this, but are merely illustrative examples.
[0032] However, the dimensions or positional relationships of the components shown in the accompanying drawings are sometimes exaggerated for clarity. Therefore, in the following description, detailed descriptions of the same names and symbols representing the same or homogeneous components are appropriately omitted. Furthermore, the elements constituting this application may be multiple elements composed of the same components, thus allowing one component to function as multiple elements; conversely, multiple components may share the function of one component. Additionally, the content described in some embodiments and implementations can be applied to other embodiments and implementations. Furthermore, in this specification, "upper" is not limited to the case of being formed in contact with an upper surface, but also includes the case of being formed separately on top, and also includes the meaning of an intermediate layer between layers.
[0033] The secondary batteries described in this application include, but are not limited to, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, and polymer lithium-ion batteries. The secondary batteries described in this application include electrode assemblies, also known as winding cores. Specific embodiments of this application are illustrated using a secondary battery comprising two electrode assemblies as an example. This application does not limit the number of electrode assemblies in a secondary battery.
[0034] Figure 1 This is a three-dimensional structural schematic diagram of the current collector of a secondary battery according to an embodiment of this application. Figure 2 yes Figure 1 A magnified view of region A in the middle. Figure 3 yes Figure 1 A front view of the current collection component in the illustrated embodiment. (Refer to...) Figures 1-3 As shown, the current collector in this embodiment includes a terminal connection portion 110 and a tab connection portion 120. The terminal connection portion 110 includes a terminal for conductive connection with a secondary battery. The tab connection portion 120 includes a tab connecting piece 121, a tab protection piece 122, and a connector 123. The tab connecting piece 121 is connected to the terminal connection portion 110, and the tab protection piece 122 is connected to the tab connecting piece 121 through the connector 123. There is a gap 130 between the tab protection piece 122 and the tab connecting piece 121, which allows the tab to pass through.
[0035] The terminals of the secondary battery can be disposed on the top cover of the secondary battery. The terminals and the terminal connection portion 110 can be electrically connected by welding. In some embodiments, the terminal connection portion 110 includes a terminal connection piece 111, through which it is electrically connected to the terminal. In some embodiments, other structures may also be provided on the terminal connection portion 110, such as a protruding structure, for alignment and welding with the terminals of the secondary battery. This application uses the terminal connection piece 111 as an example for description, but it is not intended to be limiting.
[0036] exist Figure 1In the embodiment shown, the current collecting member is fork-shaped, i.e. both of the tab connecting pieces 121 are connected to the pole connecting piece 111. The two tab connecting pieces 121 can respectively correspond to one or more electrode assemblies in the secondary battery. The number of the tab connecting pieces 121 is not limited in the present application. The number of the tab connecting pieces 121 can be set according to the number of the electrode assemblies in the secondary battery.
[0037] In some embodiments, one tab protection piece 122 and one connecting piece 123 are arranged on each of the tab connecting pieces 121. The present application is described by way of example, but the number relationship between the tab connecting pieces 121, the tab protection pieces 122 and the connecting pieces 123 is not limited in this way.
[0038] In some embodiments, the pole connecting piece 111 and the tab connecting piece 121 are integrally formed. In other embodiments, the pole connecting piece 111 and the tab connecting piece 121 are independent parts which can be welded together by welding or the like to form a conductive connection.
[0039] Figure 4 is a structural schematic diagram of the assembly of the current collecting member and the electrode assembly according to an embodiment of the present application. Figure 5 is Figure 4 is a partial enlarged schematic view of the region B in Figure 6 is Figure 4 is a partial schematic view of the side view of Figures 4-6 As shown, the two electrode assemblies 210, 220 respectively correspond to the two tab connecting pieces 121 in the current collecting member. The two electrode assemblies 210, 220 are symmetrically arranged on the two sides of the current collecting member. The electrode assembly 210 is described by way of example below, and the description is also applicable to the electrode assembly 220. As shown in Figure 5 and Figure 6 As shown, the top end of the electrode assembly 210 has a bundle of tabs 211 which are extended after the ultrasonic welding beam. As shown in Figure 6 As shown, the tab 211 includes a welding mark area 2111 and a bending area 2112, and the welding mark area 2111 is located between the tab protection piece 122 and the tab connecting piece 121. In the subsequent core combining, the tab 211 will be bent, and the bending area 2112 is located between the root of the tab 211 and the welding mark area 2111. The bending of the tab 211 will be described in the following in combination with Figures 7-10 .
[0040] In combination with Figures 1-6In assembling the secondary battery, the tab 211 after the ultrasonic welding beam is passed through the gap 130, and then the tab protection sheet 122, the tab 211 and the tab connecting sheet 121 are welded to make the tab protection sheet 122, the tab 211 and the tab connecting sheet 121 welded and connected. During the welding process, the tab 211 is placed on the tab connecting sheet 121, and the welding tool is first pressed to make the tab protection sheet 122 close to the tab 211. The connecting piece 123 originally has a certain included angle with the tab connecting sheet 121. During the pressing process of the welding tool, the connecting piece 123 is pressed, and the included angle becomes smaller. After the welding tool is pressed, the lower surface of the tab protection sheet 122 is tightly attached to the upper surface of the tab 211, and the tab protection sheet 122, the tab 211 and the tab connecting sheet 121 are pressed together. Then, the pressed area of the tab protection sheet 122, the tab 211 and the tab connecting sheet 121 is welded by laser.
[0041] According to the current collecting member of the embodiment, since the tab 211 is pressed and covered by the tab protection sheet 122, the pressing consistency of the tab 211 is improved; at the same time, since the tab protection sheet 122 is welded with the tab 211 and the tab connecting sheet 121, the process window of the laser welding device is larger, and it is not necessary to be limited to the problem that too large power will cause the edge of the tab to break, which is beneficial to improve the assembly efficiency and product yield. In addition, since the tab protection sheet 122 is used, the process window of the energy, focus and welding mode (swing mode) of the laser welding is larger, the process compatibility is better, which can be applied to various welding scenes, and the adaptability of the product is improved.
[0042] As shown in Figure 2 and Figure 3 in some embodiments, the connecting piece 123 is in the form of a sheet. In some embodiments, the connecting piece 123 has a first end 1231 connected with the tab protection sheet 122 and a second end 1232 connected with the tab connecting sheet 121, and the connecting piece 123 has an included angle with the tab connecting sheet 121, and the range of the included angle is 45 degrees to 90 degrees. As shown in Figure 2 , the included angle is towards the gap 130.
[0043] In some embodiments, the height of the gap between the tab protection sheet 122 and the tab connecting sheet 121 is 1.5-3mm, which can facilitate the placement of the tab while reducing the size of the connecting piece 123. The height of the gap is the shortest distance between the tab protection sheet 122 and the tab connecting sheet 121 before the tab protection sheet 122 is pressed.
[0044] In some embodiments, the tab protection sheet 122 has a first side 1221 away from the pole connecting sheet 111, and the connecting piece 123 is arranged close to the first side 1221. As shown in Figure 2As shown, the tab protection sheet 122 is substantially rectangular, and the connecting piece 123 is arranged at a short side of the tab protection sheet 122 located at the first side 1221.
[0045] According to these embodiments, the connecting piece 123 serves to connect the tab protection sheet 122 and the tab connecting sheet 121, and can support the tab protection sheet 122 so that the gap 130 between the tab protection sheet 122 and the tab connecting sheet 121 is larger. The connecting piece 123 is arranged only at one short side of the tab protection sheet 122, so that the tab can be conveniently inserted into the gap 130 from other directions.
[0046] In some embodiments, the connecting piece 123 can be made of a material with lower hardness and thinner thickness, or the connecting piece 123 can be rotatably connected with the tab connecting sheet 121 and the tab protection sheet 122, so that the connecting piece 123 can be pressed down when the tab protection sheet 122 is pressed down by the welding tool. When the tab protection sheet 122 is pressed down to be pressed against the tab, the included angle between the connecting piece 123 and the tab connecting sheet 121 is reduced to 0-10 degrees.
[0047] As shown in Figure 2 , in some embodiments, the connecting piece 123 is substantially rectangular sheet-shaped structure, and the length of the side connected with the tab connecting sheet 121 is 2-3 mm, so as to ensure the connection strength.
[0048] In some embodiments, the first end 1231 is closer to the pole connecting portion 110 than the second end 1232. According to these embodiments, when the tab protection sheet 122 is pressed down, it moves in the direction parallel to the tab connecting sheet 121, towards the pole connecting portion 110.
[0049] In other embodiments, referring to Figure 2 and Figure 3 , the connecting piece 123 can also be arranged at one short side of the tab protection sheet 122 close to the pole connecting portion 110, i.e. at the second side 1222 as shown in Figure 2 , and the first end 1231 is farther away from the pole connecting portion 110 than the second end 1232. When the tab protection sheet 122 is pressed down, it moves in the direction parallel to the tab connecting sheet 121, away from the pole connecting portion 110. Referring to Figure 4 , according to these embodiments, the current collecting member can be inserted from the outside to the inside of the electrode assembly 210 when assembling, so that the tab 211 enters the gap 130.
[0050] As shown in Figure 2As shown, in some embodiments, the tab protection piece 122 includes a welding portion 1223 and a support portion 1224. The support portion 1224 is disposed at at least one side of the welding portion 1223, and the support portion 1224 is inclined relative to the welding portion 1223 in a direction away from the tab connecting piece 121. Figure 2 In the middle, the direction away from the electrode connecting piece 121 is upward.
[0051] In some embodiments, the welding portion 1223 is arranged parallel to the tab connecting piece 121, and the welding portion 1223 has a sheet-like structure. During use, the tab, after being ultrasonically focused, passes through the gap 130, and the tooling presses down on the welding portion 1223 and performs welding, thus welding the welding portion 1223 to the tab and the tab connecting piece 121. In some embodiments, the area of the welding portion 1223 is adapted to the size of the tab soldering area 2111, so that the welding portion 1223 can cover the tab soldering area 2111, thereby reliably welding the tab protection piece 122 to the tab 211.
[0052] In some embodiments, the surface of the welding portion 1223 away from the tab connecting piece 121 includes a rough surface, which is used to reduce high laser reflection. During laser welding, the surface of the welding portion 1223 away from the tab connecting piece 121 is the welding surface. By providing this surface with a rough surface, high laser reflection can be reduced. A rough surface indicates that the surface is not planar. A rough surface indicates that the surface has a certain roughness, for example, the roughness Ra is greater than or equal to a preset threshold, which can be set according to specific circumstances. For example, the roughness Ra is greater than or equal to 2.5 μm. A rough surface may also indicate that the surface is embossed, and this application does not limit the embossing pattern. A rough surface may also indicate that the surface has height differences, such as unevenness.
[0053] The following combination Figures 7-10 Explain the configuration and function of the support unit 1224.
[0054] Figure 7 yes Figure 4 The diagram shows the structure of the current collector and electrode assembly after core assembly. Figure 8 yes Figure 7 The front view of the embodiment shown. Figure 9 yes Figure 7 Top view of the embodiment shown. Figure 10 yes Figure 7 A side view of the illustrated embodiment. (As shown) Figures 7-10 As shown, after the electrode assemblies 210 and 220 are assembled, the tab protection piece 122 faces and approaches the top of the electrode assemblies 210 and 220, while the tab connecting piece 121 is relatively far away from the top of the electrode assemblies 210 and 220. Figure 10 As shown, after the core is assembled, the tab 211 is bent, with the bending area 2112 shown.Figure 2 As shown, assuming the welding portion 1223 has a first side edge 1225, when assembling, the tab 211 enters the gap 130 from the first side edge 1225, then after the tab 211 enters the gap 130, the tab 211 is located at the tab root on the top of the electrode assembly 210 close to the first side edge 1225. In combination with the fact that the support portion 1224 is arranged on the first side edge 1225 of the welding portion 1223, the tab 211 is supported by the support portion 1224, which can prevent the un-bunched tab 211 from generating pores with the current collecting member, causing a burst point and a false weld, and can also prevent the bending area 2112 from being broken, which is conducive to improving the performance of the battery. Figure 10 As shown, in an embodiment, the tab protection sheet 122 is provided with a support portion 1224 only at the first side edge 1225 of the welding portion 1223, and the support portion 1224 is arranged obliquely relative to the welding portion 1223. After the core is combined, the tab 211 is bent, and the bending area 2112 of the tab 211 can be in abutment with and supported by the support portion 1224, which can prevent the un-bunched tab 211 from generating pores with the current collecting member, causing a burst point and a false weld, and can also prevent the bending area 2112 from being broken, which is conducive to improving the performance of the battery.
[0055] Reference is made to FIG. 6, which shows a schematic view of the tab protection sheet 122 according to an embodiment of the present application. Figure 5 As shown, in some embodiments, the length of the welding portion 1223 is greater than or equal to the width of the tab 211, so that a reliable welding connection can be formed with the tab 211. Accordingly, the length of the support portion 1224 located at the first side edge 1225 is greater than or equal to the width of the tab 211, so that it can support the tab 211 as a whole.
[0056] It should be noted that the support portion 1224 is arranged obliquely relative to the welding portion 1223, which means that the outer side of the support portion 1224 is inclined away from the direction of the tab connecting sheet 121. The included angle between the support portion 1224 and the welding portion 1223 is a right angle or an obtuse angle.
[0057] In the embodiment shown in FIG. 6, the support portion 1224 is arranged around the welding portion 1223, and the support portion 1224 and the welding portion 1223 together form a groove. Figure 2 In the embodiment shown in FIG. 6, the support portion 1224 is arranged around the welding portion 1223, and the support portion 1224 and the welding portion 1223 together form a groove. In some cases, during the assembly process, the welding slag generated during the laser welding process may fall off and pierce the diaphragm of the battery, causing the electrode assembly to short circuit. According to these embodiments of the present application, by arranging the groove, the welding slag splashed during the laser welding process can be soft bound, i.e. bound in the groove. A sealing layer can be formed at the groove in the subsequent process, and the welding mark and the welding slag are all sealed in the sealing layer, preventing the welding slag from falling off.
[0058] In some embodiments, the sealing layer is an insulating material, which can include any one of hot melt adhesive, adhesive tape, and high polymer coating.
[0059] In some embodiments, the angle of the support portion 1224 located at the first side edge 1225 is set according to the angle of the bent portion 2112 of the tab 211. The angle of the support portion 1224 located at the other side edge of the welding portion 1223 can be set arbitrarily, and the angle between the support portion 1224 and the welding portion 1223 ranges from 0 degree to 180 degrees. In some embodiments, the angle between the support portion 1224 and the welding portion 1223 ranges from 0 degree to 90 degrees, such as 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees, etc.
[0060] As shown in FIG. 1 1, the present application also provides a secondary battery including the electrode assembly 210, 220 and the current collecting member described above. As shown in FIG. 12, the secondary battery includes a positive electrode and a negative electrode, and the electrode assembly 210, 220 each has a positive tab and a negative tab. Accordingly, the current collecting member includes a positive current collecting member and a negative current collecting member, which are respectively used to connect with the positive tab and the negative tab. As an example, the electrode assembly 210 is shown in FIG. 13, which includes the positive tab 211a and the negative tab 211b. Figure 7 Figure 7 As shown in FIG. 1 1, the present application also provides a secondary battery including the electrode assembly 210, 220 and the current collecting member described above. As shown in FIG. 12, the secondary battery includes a positive electrode and a negative electrode, and the electrode assembly 210, 220 each has a positive tab and a negative tab. Accordingly, the current collecting member includes a positive current collecting member and a negative current collecting member, which are respectively used to connect with the positive tab and the negative tab. As an example, the electrode assembly 210 is shown in FIG. 13, which includes the positive tab 211a and the negative tab 211b. Figure 7 Figure 7 As shown in FIG. 14, the secondary battery includes two electrode assemblies 210, 220, and the core after being combined is fixed by using several binding tapes 230. Other structures of the secondary battery, such as the top cover, the shell, etc., are not shown in the figure.
[0061] The secondary battery of the present application has high assembly efficiency and product yield due to the use of the current collecting member of the present application.
[0062] Although some presently preferred embodiments are discussed above by way of various examples, it should be understood that such details are merely for the purpose of explanation of the embodiments of the present application and are not intended to limit the scope of the appended claims to the combination specifically shown. For example, although the system components described above can be implemented by hardware devices, they can also be implemented by software solutions only, such as installing the described system on an existing server or mobile device.
[0063] Similarly, it should be noted that, in order to simplify the description of the present application and to help the understanding of one or more embodiments, the description of the embodiments of the present application above sometimes combines various features into one embodiment, figure or description thereof. However, this method of disclosure does not mean that the features required by the present application are more than those mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.
[0064] In some embodiments, numbers that describe amounts, dimensions, and so forth, are used in the description of the embodiments. It should be understood that such numbers are used to describe some embodiments and that such numbers can be modified by the modifier "about" or "approximately" in some examples. Unless otherwise stated, "about" or "approximately" indicates that the amount can vary from the stated amount by as much as 20 percent. Accordingly, in some embodiments, numerical parameters in the specification and claims are approximations that can vary depending on the desired properties sought to be obtained in light of the individual embodiments. In some embodiments, numerical parameters are approximations that can vary from the stated numerical parameters. In some embodiments, numerical parameters should be considered in the context of the number of significant digits given. Although the numerical ranges and parameters setting forth the broad scope of some embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable.
Claims
1. A current collecting member of a secondary battery, characterized by comprising: The connecting part of the pole and the connecting part of the tab are included, wherein, The connecting part of the pole is used for electrically connecting with the pole of the secondary battery; The connecting part of the tab includes a tab connecting piece, a tab protection piece and a connecting piece, the tab connecting piece is connected with the connecting part of the pole, the tab protection piece is connected with the tab connecting piece through the connecting piece, the tab protection piece and the tab connecting piece have a gap therebetween, and the gap is used for allowing the tab to pass therethrough.
2. The current collecting member according to claim 1, wherein The tab protection piece includes a welding part and a supporting part, the supporting part is arranged at at least one side of the welding part, and the supporting part is arranged in a direction away from the tab connecting piece relative to the welding part.
3. The current collecting member according to claim 2, wherein The welding part has a first side, the tab is configured to enter the gap from the first side, and the first side is provided with the supporting part.
4. The current collecting member according to claim 2, wherein The supporting part surrounds the welding part, and the supporting part and the welding part jointly form a groove.
5. The current collecting member according to claim 1, wherein A surface of the tab protection piece away from the tab connecting piece includes a rough surface, and the rough surface is used for reducing laser high reflection.
6. The current collecting member according to claim 1, wherein The connecting piece has a first end and a second end, the first end is connected with the tab protection piece, the second end is connected with the tab connecting piece, the connecting piece and the tab connecting piece have an included angle towards the gap, and the included angle ranges from 45 degrees to 90 degrees.
7. The current collecting member according to claim 1, wherein The gap between the tab protection piece and the tab connecting piece has a height of 1.5-3 mm.
8. The current collecting member according to claim 1, wherein The tab protection piece has a first side away from the connecting part of the pole, and the connecting piece is arranged close to the first side.
9. A secondary battery characterized by comprising: The electrode assembly includes a tab, the tab is arranged in the gap, and the tab protection piece, the tab and the tab connecting piece are welded and connected.
10. The secondary battery according to claim 9, wherein The tab includes a welding mark area and a bending area, the tab protection piece includes a welding part and a supporting part, the supporting part is arranged at at least one side of the welding part, the supporting part is arranged in a direction away from the tab connecting piece relative to the welding part, the welding part is welded and connected with the welding mark area, and the supporting part abuts against the bending area.