Positive collector plate structure of cylindrical battery and cylindrical battery

Abstract

The utility model discloses a cylindrical battery positive pole current collector plate structure and cylindrical battery, the cylindrical battery positive pole current collector plate structure comprises a positive pole current collector plate body and a positive pole current collector plate arc section connected with the tail end of the positive pole current collector plate body, the positive pole current collector plate arc section is bent towards the outer side of a battery cell to form an arc ring shape, and the positive pole current collector plate arc section is connected with the positive pole current collector plate body. And the end face of a battery cell tab is coated with the coating. According to the cylindrical battery positive pole collector plate structure and the cylindrical battery, the positive pole lug and the positive pole collector plate can be stably matched together, poor welding can be prevented, a rubber coating procedure is omitted, the assembly process is easy to control, the operation is simple, the welding yield is high, and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical battery structures, in particular to a cylindrical battery positive electrode current collecting disc structure and a cylindrical battery. Background Art

[0002] The cylindrical aluminum shell lithium-ion battery with full lugs is currently a commonly used assembly method. However, the difficulty faced by the cylindrical battery with full lug structure is how to achieve the connection between the lug and the cover plate pole. Therefore, the collector plate becomes the key to connecting the battery lug and the cover plate pole. The common collector plates are cylindrical or square. The battery assembly is to place the collector plate in the center of the end face of the battery lug, and then use laser welding to weld the collector plate and the battery lug into a whole. The other end of the collector plate is connected to the pole of the cover plate by welding or riveting. Then, through the connection of the battery lug, collector plate, and pole, the cylindrical aluminum shell lithium-ion battery is sealed and the current circuit is connected.

[0003] For the cut-and-stacked tabs, after the tabs are flattened, the flatness of the entire tab end surface will be inconsistent, that is, the inner ring tabs of the battery cell are high and the outer ring tabs are low. However, the current collector used currently is a flat sheet structure. During welding, the gap between the two can easily cause core welding to be cold and not meet the requirements. This situation will also occur when flattening. Utility Model Content

[0004] In view of the technical problems existing in the above-mentioned background technology, the purpose of the present utility model is to provide a cylindrical battery positive electrode collector plate structure and a cylindrical battery.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] According to one aspect of an embodiment of the utility model, a positive current collector plate structure for a cylindrical battery is provided, comprising a positive current collector plate body and a positive current collector plate arc segment connected to the end of the positive current collector plate body, wherein the positive current collector plate arc segment is bent toward the outside of the battery cell into an arc ring shape and wrapped around the end surface of the battery cell pole ear.

[0007] Wherein, a through hole concentric with the injection hole is arranged at the center of the positive electrode current collecting disc body, the diameter of the through hole is larger than the diameter of the injection hole, the diameter of the injection hole is 2mm-5mm, and the diameter of the through hole is 2.2mm-5.2mm.

[0008] Wherein, the arc angle of the arc segment of the positive electrode current collecting disk is 5°-30°.

[0009] Wherein, the diameter of the positive electrode current collecting disc body is 40-60 mm.

[0010] The positive electrode current collector disc body has a connection area between the positive electrode current collector disc and the positive electrode ear, and a connection area between the positive electrode column and the positive electrode current collector disc.

[0011] The end surface of the arc segment of the positive electrode current collector is coated with an insulating coating for preventing the positive electrode current collector from contacting and short-circuiting with the battery cell housing.

[0012] Wherein, the thickness of the insulating coating is 0.1-0.3 mm.

[0013] Wherein, the arc segment of the positive electrode current collector is an insulator.

[0014] Wherein, the arc segment of the positive electrode current collector disk is provided with insulator through holes at even intervals, or the arc segment of the positive electrode current collector disk is composed of a plurality of insulating sheets at even intervals.

[0015] According to another aspect of the embodiments of the utility model, a cylindrical battery is provided, comprising the cylindrical battery positive electrode current collecting disk structure as described in any one of the above items.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The cylindrical battery positive electrode collector plate structure and the cylindrical battery provided by the utility model can stably match the positive electrode ear and the positive electrode collector plate together, thereby preventing poor welding and eliminating the encapsulation process. The assembly process is easy to control, the operation is simple, and the welding yield is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 The figure shows a schematic diagram of the structure of the positive electrode current collector of a cylindrical battery in the prior art;

[0020] Figure 2 It is a structural schematic diagram of the first embodiment of the cylindrical battery positive electrode current collector structure disclosed in the embodiment of the present application;

[0021] Figure 3 It is a structural schematic diagram of a second embodiment of the cylindrical battery positive electrode current collecting disk structure disclosed in the embodiment of the present application;

[0022] Figure 4 It is a first schematic diagram of the structure of the third embodiment of the cylindrical battery positive electrode current collector structure disclosed in the embodiment of the present application;

[0023] Figure 5It is a second schematic diagram of the structure of the third embodiment of the cylindrical battery positive electrode current collector structure disclosed in the embodiment of the present application;

[0024] Figure 6 It is a third schematic diagram of the structure of the third embodiment of the cylindrical battery positive electrode current collector structure disclosed in the embodiment of the present application;

[0025] Figure 7 It is a fourth schematic diagram of the structure of the third embodiment of the cylindrical battery positive electrode current collector structure disclosed in the embodiment of the present application;

[0026] Figure 8 It is a first schematic diagram of the structure of the fourth embodiment of the cylindrical battery disclosed in the embodiments of the present application;

[0027] Fig. 9 Shown is a second schematic diagram of the structure of the fourth embodiment of the cylindrical battery disclosed in the embodiments of the present application;

[0028] In the figure, there are a positive electrode current collector plate body 1, a through hole 2, a positive electrode current collector plate arc segment 3, an insulating coating 4, an insulator through hole 5, a cylindrical battery positive electrode current collector plate structure 6, and a battery cell 7. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0032] like Figure 1 As shown, the positive collector plate structure of cylindrical batteries in the prior art is an integrated flat sheet structure, which is prone to poor connection when connected to the tabs with convex parts. After being flattened / kneaded, the tabs at both ends of the full-tab battery cell present a "convex" structure with a high middle and low ends. In order to connect the positive collector plate to the battery cell tabs and ensure the connection effect, the shape of the positive collector plate and the tab shape should match.

[0033] Embodiment 1

[0034] like Figure 2 As shown, a cylindrical battery positive current collector structure provided in this embodiment includes a positive current collector body 1 and a positive current collector arc segment 3 connected to the end of the positive current collector body 1, and the positive current collector arc segment 3 is bent toward the outside of the battery cell into an arc ring shape and covered on the end surface of the battery cell ear.

[0035] Furthermore, the arc angle of the arc segment 3 of the positive electrode current collecting disk is 5°-30°.

[0036] The cylindrical battery positive electrode collector plate structure and the cylindrical battery provided by the utility model can stably match the positive electrode ear and the positive electrode collector plate together, thereby preventing poor welding and eliminating the encapsulation process. The assembly process is easy to control, the operation is simple, and the welding yield is high.

[0037] Optionally, a through hole 2 concentric with the injection hole is provided at the center of the positive electrode current collecting disc body 1, and the diameter of the through hole 2 is slightly larger than the diameter of the injection hole, so as to facilitate the injection of electrolyte into the battery cell.

[0038] Optionally, the diameter of the injection hole is 2 mm-5 mm, and the diameter of the through hole 2 is 2.2 mm-5.2 mm.

[0039] Optionally, the diameter of the injection hole can be set to 2mm, 3mm, 4mm, etc. Correspondingly, the diameter of the through hole 2 can be set to 2.5mm, 3.5mm, 4.5mm, etc. If the diameter is set too small, it is not easy to inject electrolyte. If the diameter is set too large, the strength of both will be reduced, and they will be prone to deformation and rupture.

[0040] Optionally, the diameter of the positive electrode current collecting disc body 1 is 40-60 mm.

[0041] Optionally, the positive collector disc body 1 is a plane, connected to the core ear of the battery cell, and the positive collector disc body 1 has a connection area between the positive collector disc and the positive ear, and a connection area between the positive column and the positive collector disc, and the connection method is laser welding, ultrasonic welding, etc. If the outer diameter of the positive collector disc body 1 is too small, the area left for the positive collector disc to connect with the positive ear, and the positive column to connect with the positive collector disc is small. If the outer diameter of the positive collector disc body is too large, it is easy to exceed the core of the battery cell and contact with the negative electrode shell to cause short circuit and other problems.

[0042] Embodiment 2

[0043] In the prior art, after the positive electrode current collector is welded, high-temperature adhesive tape may be used to wrap and insulate the outside. This solution not only reduces production efficiency and increases labor costs, but also the adhesive tape may be squeezed, damaged, or debonded during punching and sealing, resulting in a risk of short circuit.

[0044] Therefore, if Figure 3 As shown, the end surface of the arc segment 3 of the positive electrode current collecting disk in this embodiment is coated with an insulating coating 4 for preventing the positive electrode current collecting disk from contacting and short-circuiting with the battery cell housing.

[0045] It should be noted that in order to prevent short circuit between the positive electrode ear and the shell, an insulating coating can be coated on the surface of the arc segment of the positive electrode collector disk, and the coating thickness is 0.1-0.3mm; if it is too small, it will not play an insulating role and cause internal short circuit of the battery. If it is too thick, it will affect the space utilization and energy density of the battery.

[0046] Embodiment 3

[0047] like Figure 4-Figure 7 As shown, in this embodiment, the arc segment 3 of the positive current collector disk can be an insulator, so that the insulator is connected to the positive current collector disk body. There is no need to separately coat the end face of the positive current collector disk with glue for insulation after assembly is completed, and the coating process is omitted. The insulator material is one or more of polypropylene, polyvinyl chloride, polyimide, polyamide, etc., and has good insulation, high temperature resistance, and corrosion resistance. The insulator can be an overall arc shape, connected to the positive current collector disk body, and coated on the end face of the battery cell ear. The incoming positive current collector disk body can be set as an integral body with the insulator, and the connection method can be snap-on, riveting, hot pressing, etc., which can omit the coating process and improve the safe use performance of the battery. Insulator through holes 5 and the like can be set on the insulator, and the shape of the insulator through holes 5 can be a polygon or other shapes. As Figure 4-Figure 5 Insulator through holes are evenly spaced on the arc segment of the positive electrode current collector; Figure 6 and Figure 7 In all the examples shown, the arc segment of the positive electrode current collector is composed of a plurality of insulating sheets evenly spaced, but the shapes of the insulating sheets are different.

[0048] Embodiment 4

[0049] As Figure 8-Figure 9 shown, the cylindrical battery provided in this embodiment includes the cylindrical battery positive current collector plate structure 6 described in any one of the above, as well as the battery cell 7, the negative current collector plate, etc. that are used in cooperation. The positive current collector plate covers the end face of the positive electrode tab of the battery cell. The negative current collector plate is in contact with the housing, and the housing is negatively charged and can be set as "宀". The materials of the housing, the negative electrode tab, and the negative current collector plate are stainless steel, copper, nickel, nickel-plated stainless steel, nickel-plated copper, etc., and the materials of the positive electrode tab and the positive electrode post are aluminum / aluminum alloy. The cylindrical battery provided in this embodiment also has the technical effects brought by the cylindrical battery positive current collector plate structure in this application.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A cylindrical battery positive electrode collector structure, characterized in that: It comprises a positive current collector disc body (1) and a positive current collector disc arc segment (3) connected to the end of the positive current collector disc body (1); the positive current collector disc arc segment (3) is bent toward the outside of the battery cell into an arc ring shape and covers the end surface of the battery cell pole ear.

2. A cylindrical battery positive electrode current collector structure according to claim 1, characterized in that: A through hole (2) concentric with the injection hole is provided at the center of the positive electrode current collecting disc body (1); the diameter of the through hole (2) is larger than the diameter of the injection hole; the diameter of the injection hole is 2 mm-5 mm, and the diameter of the through hole (2) is 2.2 mm-5.2 mm.

3. A cylindrical battery positive electrode current collector structure according to claim 1, characterized in that: The arc angle of the positive electrode current collecting disk circular arc segment (3) is 5°-30°.

4. A cylindrical battery positive electrode current collector structure according to claim 1, characterized in that: The diameter of the positive electrode current collecting disc body (1) is 40-60 mm.

5. A cylindrical battery positive electrode current collector structure according to claim 4, characterized in that: The positive electrode current collecting disc body (1) has a positive electrode current collecting disc and positive electrode ear connection area, and a positive electrode column and positive electrode current collecting disc connection area.

6. A cylindrical battery positive electrode current collector structure according to claim 1, characterized in that: The end surface of the arc segment (3) of the positive electrode current collecting disc is coated with an insulating coating (4) for preventing the positive electrode current collecting disc from contacting and short-circuiting the battery cell housing.

7. A cylindrical battery positive electrode current collector structure according to claim 6, characterized in that: The thickness of the insulating coating (4) is 0.1-0.3 mm.

8. The positive electrode current collector structure of a cylindrical battery according to claim 1, characterized in that: The positive electrode current collecting disk arc segment (3) is an insulator.

9. A cylindrical battery positive electrode current collector structure according to claim 8, characterized in that: Insulator through holes (5) are evenly spaced on the positive electrode current collecting disk circular arc segment (3), or the positive electrode current collecting disk circular arc segment (3) is composed of a plurality of evenly spaced insulating sheets.

10. A cylindrical battery, characterized in that: It comprises a cylindrical battery positive electrode current collecting disc structure (6) as claimed in any one of claims 1 to 9.

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