A composite current collector
By designing multiple solder prints arranged at intervals in the composite liquid collector, the electrode ear is connected to the current collector body, which solves the problem that the electrode ear is not easy to bend at the welding point, and achieves the bending effect of the electrode ear at the welding point.
Patent Information
- Application Number
- CN202421305424.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-11
AI Technical Summary
The existing composite fluid collector is not conducive to the bending of the pole ear at the welding point, resulting in poor bending of the pole ear here.
Multiple solder prints arranged at a pitch are connected to the current collector body, and the gap between adjacent solder prints forms a buffer belt, so that the electrodes are easily bent between the solder print gaps.
The effect of welding reinforcement is reduced through indirect welding and the bendability of the pole ear at the welding is increased.
Smart Images
Figure CN222735004U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of lithium ion batteries, in particular to a composite current collector. Background Art
[0002] The current collector refers to a structure or part that collects current. The current collector is used to connect the tabs and collect the current generated by the active material of the battery to form a larger current output. Composite current collectors have the advantages of small thickness and high stability, and are therefore widely used.
[0003] The composite current collector is a metal layer coated on an insulating film, and on this basis, the metal layers on both sides of the insulating film are welded together with their respective pole ears, thereby connecting the metal layers on both sides. The existing one-piece roll welding connection method has a wide roll welding width, which is not conducive to the bending of the pole ears here.
[0004] Therefore, we proposed a composite current collector to solve the problem that the tab is difficult to bend at the welding point. Utility Model Content
[0005] The purpose of the utility model is to solve the shortcomings of the prior art. In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A composite current collector comprises a current collector body and a conductive connector, wherein the conductive connectors are overlapped on opposite sides of the current collector body, and a plurality of weld marks arranged at intervals are provided at the overlapped portions of the current collector body and the conductive connector; a pole ear is connected to the current collector body by the plurality of weld marks arranged at intervals, and on the one hand, the interval between adjacent weld marks reduces the effect of welding strengthening, and on the other hand, in the X direction, the weld mark interval is designed to form a buffer zone, so that the pole ear is easy to bend between the weld mark gaps.
[0007] Further preferably, the length direction of the current collector body is the X direction, at least two weld marks are provided in the X direction, and in the X direction, the weld mark spacing A is 0.1-30 mm, and the weld mark width B is 0-50 mm.
[0008] Further preferably, the width direction of the current collector body is the Y direction, at least one weld mark is provided in the Y direction, and the length C of the weld mark is 0-1000 mm.
[0009] Further preferably, the weld mark is rectangular and is centrally distributed at the overlapping portion between the current collector body and the conductive connector.
[0010] Further preferably, the current collector body includes an insulating layer and a first metal layer and a second metal layer respectively coated on both sides of the insulating layer.
[0011] Further preferably, the conductive connector includes a first pole tab and a second pole tab, and the upper and lower surfaces of the current collector body are connected to the first pole tab and the second pole tab by welding.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] The utility model connects the pole ear and the current collector body by means of a plurality of weld marks arranged at intervals. On the one hand, indirect welding reduces the effect of welding strengthening. On the other hand, the gaps between adjacent weld marks form a buffer zone, making the pole ear easy to bend. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is the front view of the utility model;
[0015] Figure 2 It is a schematic diagram of the explosion structure of the utility model.
[0016] In the figure: current collector body 1, conductive connecting member 2, welding stamp 3, insulating layer 11, first metal layer 12, first pole ear 13, second metal layer 14, second pole ear 15. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0018] Reference Figure 1-Figure 2 A composite current collector comprises a current collector body 1 and a conductive connector 2, wherein the current collector body 1 is overlapped with the conductive connector 2 on both sides of the opposite sides in the length direction, and a plurality of weld marks 3 arranged at intervals are provided at the overlapped portion between the current collector body 1 and the conductive connector 2, wherein the weld marks are rectangular and are centrally distributed at the overlapped portion between the current collector body and the conductive connector.
[0019] The length direction of the current collector body 1 is the X direction, and at least two weld marks 3 are arranged in the X direction. In the X direction, the weld mark interval A is 0.1-30 mm, and the weld mark 3 width B is 0-50 mm.
[0020] The width direction of the current collector body 1 is the Y direction. At least one weld mark 3 is provided in the Y direction. In the Y direction, the weld mark spacing D is 0-300 mm, and the length C of the weld mark 3 is 0-1000 mm.
[0021] Embodiment 1: The weld marks 3 arranged at intervals have a width B of 2 mm and a length C of 20 mm; there are 2 weld marks in the X direction and 3 weld marks in the Y direction; in the X direction, the weld mark interval A is 5 mm, and in the Y direction, the weld mark interval D is 10 mm.
[0022] Embodiment 2: The weld marks 3 arranged at intervals have a width B of 1 mm and a length C of 30 mm; there are 3 weld marks in the X direction and 5 weld marks in the Y direction; in the X direction, the weld mark interval A is 3 mm, and in the Y direction, the weld mark interval D is 5 mm.
[0023] Embodiment 3: The weld marks 3 arranged at intervals have a width B of 0.5 mm and a length C of 12 mm; there are 2 weld marks in the X direction and 10 weld marks in the Y direction; in the X direction, the weld mark interval A is 1.5 mm, and in the Y direction, the weld mark interval D is 3 mm.
[0024] In the above embodiment: the electrode tab is connected to the current collector body by a plurality of weld marks arranged at intervals. On the one hand, the interval between adjacent weld marks reduces the effect of welding strengthening. On the other hand, in the X direction, the weld mark interval A is designed to form a buffer zone, so that the electrode tab is easy to bend between the weld mark intervals A.
[0025] The current collector body 1 includes an insulating layer 11 and a first metal layer 12 and a second metal layer 14 respectively coated on both sides of the insulating layer 11. The conductive connecting member 2 includes a first pole tab 13 and a second pole tab 15. The upper and lower surfaces of the current collector body 1 are connected to the first pole tab 13 and the second pole tab 15 through a weld mark 3.
[0026] In the embodiment: the insulating layer 11 is an insulating film, and the material of the insulating film is any one of PMMA, PP, PE, PET, and PI. The first metal layer 12 and the second metal layer 14 are extremely thin metal sheets or strips, such as gold, silver, copper, iron, tin, zinc, lead, nickel, aluminum, tungsten, molybdenum, tantalum, niobium, titanium, steel and stainless steel, nickel-based and cobalt-based alloys, etc., preferably aluminum foil and copper foil. In order to reduce the bendability of the composite current collector, a thin metal layer is coated on both sides of the insulating film. At the pole ear, the metals on both sides are indirectly welded to their respective foil metals. On the one hand, indirect welding reduces the effect of welding strengthening. On the other hand, the gap between adjacent weld marks forms a buffer zone, which makes the pole ear easy to bend.
Claims
1. A composite current collector, characterized in that: It comprises a current collector body and a conductive connector. The conductive connectors are overlapped on two opposite sides of the current collector body. The overlapped parts of the current collector body and the conductive connector are provided with a plurality of weld marks arranged at intervals.
2. A composite current collector according to claim 1, characterized in that: The length direction of the current collector body is the X direction, at least two weld marks are arranged in the X direction, in the X direction, the weld mark spacing A is 0.1-30 mm, and the weld mark width B is 0-50 mm.
3. A composite current collector according to claim 2, characterized in that: The width direction of the current collector body is the Y direction, and at least one weld mark is provided in the Y direction, and the length C of the weld mark is 0-1000 mm.
4. A composite current collector according to claim 1, characterized in that: The weld mark is rectangular and is centrally distributed at the overlapping portion between the current collector body and the conductive connector.
5. A composite current collector according to claim 1, characterized in that: The current collector body includes an insulating layer and a first metal layer and a second metal layer respectively coated on both sides of the insulating layer.
6. A composite current collector according to claim 1, characterized in that: The conductive connecting member comprises a first pole tab and a second pole tab, and the upper and lower surfaces of the current collector body are connected to the first pole tab and the second pole tab by welding.