Punched copper strip

Abstract

The utility model relates to the field of battery pole plates, in particular to a punching copper strip, which comprises side strips positioned on the edges of two sides of the punching copper strip along the length direction, a hole area is arranged between the two side strips, and the hole area is divided into a left hole area and a right hole area by a hole-free strip positioned in the middle along the length direction. The non-porous belt is arranged in the middle of the punched copper belt and is punched into the tab, so that the step of cutting off wider edges in the traditional design is avoided, and the utilization rate of materials is remarkably improved. The tab is directly formed through the tooth-shaped blanking line, and the step of welding the tab is omitted, so that the production efficiency is improved; meanwhile, due to the fact that the punching copper strip has sufficient stress points in the machining process before punching and blanking, stability in the machining and transporting process is guaranteed, deformation is reduced, the production process is further optimized, and the reject ratio in production is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of battery pole plate, concretely is a punched copper strip. BACKGROUND

[0002] Nickel-zinc battery is a kind of rechargeable battery with nickel and zinc as active material, and it is concerned for its high energy density, fast charging ability and environmental protection characteristics. When this battery is discharged, zinc loses electrons at the negative electrode, and nickel gains electrons at the positive electrode, forming an electric current. Its energy density can reach 150Wh / kg~250Wh / kg, providing stable voltage output, and having more than 500 times of charge-discharge cycle life. The environmental protection advantage of nickel-zinc battery lies in not containing toxic heavy metals such as lead and cadmium, reducing the pollution to the environment. In addition, they also have low self-discharge rate and high energy conversion efficiency. These characteristics make nickel-zinc battery have wide application potential in electric vehicles, energy storage systems, portable electronic devices and other fields.

[0003] In nickel-zinc battery, nickel is used as the positive electrode, and the main active material is Ni(OH)2; zinc is used as the negative electrode. The negative active material is attached to the current collector on the negative plate of the battery, and the current collector is used to collect electrons and concentrate current. In nickel-zinc battery, the current collector is mainly made of punched copper strip. The purpose of punching holes on the current collector is that the active material connects through the hole area, which plays a role like a rivet, tightly adhering the active material on both sides of the skeleton plate to the plate surface; the second purpose is to improve the porosity by orderly arrangement, which can fill more active material and is beneficial to improve the capacity of the battery.

[0004] In order to ensure that the deformation of the punched copper strip in the width direction is within a controllable range, the existing punched copper strip often needs to leave a relatively wide non-punching edge on the side during punching to avoid serious deformation of the copper strip caused by punching stress, and also to facilitate the subsequent process of transporting the punched copper strip. Then, before the punched copper strip is used as a current collector, it often needs to cut off part of the above-mentioned edge, thereby causing waste of raw materials. SUMMARY

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a punched copper strip with narrow edge and without material waste.

[0006] In order to solve the above technical problems, the utility model provides the following punched copper strip, which includes edge strips located on both side edges of the punched copper strip along the length direction, and the hole area between the two edge strips is divided into left and right two hole areas by the non-hole strip located in the middle along the length direction.

[0007] As some embodiments of the utility model, the non-hole strip is punched to form a tab.

[0008] As some embodiments of the utility model, the punching line of the non-hole strip is tooth-shaped.

[0009] As some embodiments of the utility model, the punching in the hole area is circular.

[0010] As some embodiments of the utility model, the area density of the hole area is 418 ± 20g / m 2 .

[0011] As some embodiments of the utility model, the diameter of the punching is 1mm.

[0012] As some embodiments of the utility model, the width of the non-hole belt is 30.64mm.

[0013] As some embodiments of the utility model, the width of the punched copper belt is 216mm.

[0014] As some embodiments of the utility model, the width of the edge belt is 1.18mm.

[0015] As some embodiments of the utility model, the hole distance of the width direction punching is 2.26mm, and the interval of the width direction punching is 1.13mm.

[0016] As some embodiments of the utility model, the hole distance of the length direction punching is 1.30mm, and the interval of the length direction punching is 0.65mm.

[0017] As some embodiments of the utility model, the thickness of the punched copper belt is 0.1mm.

[0018] As some embodiments of the utility model, the punched copper belt is plated with tin, and the thickness of the tin plating layer is 1.5um-3um.

[0019] As some embodiments of the utility model, the height of the C shape in the width direction is less than 1.0mm.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] 1. improve material utilization. By setting the non-hole belt in the middle of the punched copper belt, and punching the non-hole belt into the tab, the step of cutting off the wide edge in the traditional design is avoided, thereby significantly improving the material utilization.

[0022] 2. improve production efficiency. The traditional punched copper belt needs an additional step to weld the tab, and the utility model directly forms the tab through the tooth-shaped punching line, thereby improving the production efficiency; at the same time, since the punched copper belt has sufficient stress points in the machining process before punching and punching, the stability in the machining and transportation process is guaranteed, and the deformation is reduced, which further optimizes the production process and reduces the defective rate in production.

[0023] 3. Enhance the performance of the battery. The utility model discloses through the size and the pitch of punching, and the width of the non-hole belt, can provide higher porosity while guaranteeing the processing qualified rate, thereby allowing more active material to be filled, which is conducive to improving the capacity and energy density of the battery. In addition, the design of the punched copper belt surface tinning not only enhances the corrosion resistance of the battery, but also helps to prevent hydrogen evolution problems, thereby prolonging the service life of the battery and improving the overall performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art. Obviously, the drawings described below are only one embodiment of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0025] Figure 1 It is a punched copper belt structure schematic diagram of the embodiment of the application.

[0026] Figure 2 It is Figure 1 It is a local enlarged view of A in the middle.

[0027] Figure 3 It is a punched copper belt blanking line structure schematic diagram of the embodiment of the application.

[0028] Figure 4 It is a structure schematic diagram of the punched copper belt after being blanked into a current collector.

[0029] The marks in the drawings are: 1, hole area; 11, punching; 2, non-hole belt; 21, blanking line; 22, tab; 3, edge belt. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the technical scheme in the specific embodiment of the utility model is described clearly and completely below to further illustrate the utility model. Obviously, the described specific embodiment is only one part of the embodiment of the utility model, not all styles.

[0031] Embodiment 1: the embodiment is a punched copper belt, as shown in 1, 2, 3, 4, including the edge belt 3 located at both side edges of the punched copper belt along the length direction, the hole area 1 between the two edge belts 3 is divided into left and right two hole areas 1 by the non-hole belt 2 located in the middle. Figure 1 、 3

[0032] ​The non-hole belt 2 can be punched along the tooth-shaped punching line 21 to form the tab 22, and then the left and right two hole areas 1 are punched to form two current collectors.

[0033] This design makes the copper belt have sufficient stress points in the processing process before punching and punching, ensures that the processing and transportation process is not deformed, and at the same time, through the tooth-shaped punching mode, the non-hole belt 2 after punching forms the tab 22 required by the battery current collector, avoids the waste of materials in the punched copper belt, and reduces the subsequent welding process of the tab.

[0034] Embodiment 2: This embodiment is based on embodiment 1, and a feasible specific parameter is used to further illustrate the structure of the punched copper belt, as shown in the figure. Figures 1 to 4 The punched copper belt thickness is 0.1mm, the punched hole 11 in the hole area 1 is a circular hole with a diameter of 1mm, and the area density of the hole area 1 is: 418±20g / m 2 Although the smaller the hole diameter, the higher the void ratio can be achieved, but the hole diameter is too small, which leads to a sharp increase in the cost of the punching die, and sharply increases the possibility of deformation of the punched copper belt as a current collector, so in this embodiment, a 1mm circular hole is taken as an example.

[0035] The width Wa of the non-hole belt 2 is 30.64mm, the width Wb of the punched copper belt is 216mm, and the width Wc of the edge belt 3 is 1.18mm, and the C-shaped height in the width direction is <1.0mm.

[0036] The hole distance La of the width direction punched hole 11 is 2.26mm, the interval Lb of the width direction punched hole 11 is 1.13mm, the hole distance Lc of the length direction punched hole 11 is 1.30mm, and the interval Ld of the length direction punched hole 11 is 0.65mm.

[0037] In order to avoid the problem of hydrogen evolution when the punched copper belt is directly used as a current collector in a nickel-zinc battery, in this embodiment, the surface of the punched copper belt is plated with a tin plating layer with a thickness of 1.5-3μm.

[0038] The above describes the main technical features and basic principles and related advantages of the present application, and for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary specific embodiments, and can be realized in other specific forms without departing from the concept or basic characteristics of the present application. Therefore, from any point of view, the above specific embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0039] In addition, it should be understood that, although the present specification is described in terms of various embodiments, not every embodiment need necessarily include every independent technical solution, and the present specification is described in this manner only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A punched copper strip comprising edge strips (3) located along the length of the punched copper strip at both side edges of the punched copper strip, between the two edge strips (3) being a hole area (1), characterized in that, The hole area (1) is divided into two hole areas (1) by the middle non-hole belt (2) along the length direction.

2. The punched copper strip of claim 1, wherein, The non-hole belt (2) is punched to form the lug (22).

3. The punched copper strip of claim 2, wherein, The punching line (21) of the non-hole belt (2) is tooth-shaped.

4. The punched copper strip of claim 1, wherein, The punched holes (11) in the hole area (1) are circular, and the areal density of the hole area (1) is: 418 ± 20 g / m 2 .

5. The punched copper strip of claim 4, wherein, The diameter of the punching hole (11) is 1mm.

6. The punched copper strip of claim 1, wherein, The width of the non-hole belt (2) is 30.64mm.

7. The punched copper strip of claim 1, wherein, The width of the punched copper belt is 216mm; the width of the side belt (3) is 1.18mm.

8. The punched copper strip of claim 5, wherein, The hole distance of the width direction punching hole (11) is 2.26mm; the interval of the width direction punching hole (11) is 1.13mm; the hole distance of the length direction punching hole (11) is 1.30mm; the interval of the length direction punching hole (11) is 0.65mm.

9. The punched copper strip of claim 1, wherein, The thickness of the punched copper belt is 0.1mm, and the surface is plated with tin, and the thickness of the tin plating layer is 1.5-3μm.

10. The punched copper strip of claim 1, wherein, The height of the C shape in the width direction is less than 1.0mm.

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