A positive current collector and a battery

Abstract

The utility model discloses an anode current collecting disc and battery, the anode current collecting disc is hexagonal with fish tail structure, and is provided with insulating part on the fish tail structure of anode current collecting disc, thereby when preparing full pole ear battery, makes the anode current collecting disc based on the insulating part of fish tail structure, avoids and contacts the steel shell inner wall, improves the production efficiency, reduces the production cost.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing, specifically to a positive electrode current collector and a battery. Background Technology

[0002] In the fabrication of a multi-tab battery, the pre-reserved foil at both ends of the cylindrical core needs to be welded to the current collectors. The current collectors are divided into positive and negative current collectors. When welding the pre-reserved foil at both ends of the cylindrical core to the current collectors, one side of the negative current collector needs to be welded to the copper foil at the bottom of the cylindrical core, and the other side to the bottom of the cylindrical steel shell of the battery, so that the entire outer side of the cylindrical steel shell of the battery is negative. The positive current collector is welded to the aluminum foil at the top of the cylindrical core. Then, the positive current collector is welded to the aluminum metal part in the center of the cell cap, so that the positive and negative electrodes of the battery are isolated by the insulating gasket of the cap. Sealing the cell is achieved by grooving. Specifically, the cap with the welded positive current collector is placed into the groove, and then pressed by a sealing mold, pressing the edge of the steel shell and the insulating ring of the cap together into an inward-curving shape, thus achieving the purpose of sealing.

[0003] In a multi-tab battery, the entire circumferential edge of the positive and negative current collectors serves as a conductive channel, directly connecting to the cell's cap to create multiple current conduction paths. This allows the entire circumferential edge of the current collectors to function as tabs. However, to prevent the positive current collector tab from contacting the inner wall of the tumbler during cell sealing, which could cause a short circuit and potentially lead to an explosion or fire, an adhesive application step can be added before sealing. This involves attaching insulating tape to the positive current collector. However, this operation increases the number of steps in the multi-tab battery manufacturing process, reduces efficiency, and raises costs.

[0004] Therefore, it is necessary to provide a positive current collector that avoids contact between the positive current collector and the inside of the steel casing during the fabrication of a multi-tab battery, thereby improving manufacturing efficiency and reducing manufacturing costs. Utility Model Content

[0005] In view of this, the present invention provides a positive current collector and a battery, which avoids contact between the positive current collector and the inside of the steel shell when preparing a full-tab battery, thereby improving manufacturing efficiency and reducing manufacturing costs.

[0006] To achieve the above objectives, the present invention provides the following technical solutions.

[0007] In a first aspect, this utility model provides a positive current collector, which is a hexagonal structure with a fishtail, and an insulating part is provided on the fishtail structure of the positive current collector.

[0008] Optionally, the positive current collector is also provided with welding holes.

[0009] Optionally, the welding hole is a circular hole, and the welding hole corresponds to each side and the center point of the positive current collector.

[0010] Optionally, the positive current collector is further provided with a welding part, which protrudes from the diagonal of the hexagonal structure in the positive current collector on the side of the positive current collector facing the core.

[0011] Secondly, this utility model provides a battery, including the positive current collector as described above.

[0012] The positive current collector of this utility model embodiment is hexagonal with a fishtail structure, and an insulating part is provided on the fishtail structure of the positive current collector. Therefore, when manufacturing a tab battery, the positive current collector avoids contact with the inner wall of the steel shell due to the insulating part provided on the fishtail structure. Thus, there is no need to perform an adhesive application step on the positive current collector, which can ensure that the positive current collector does not come into contact with the inner wall of the steel shell, thereby improving the manufacturing efficiency of the tab battery and reducing the manufacturing cost. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of an optional structure of the positive current collector provided in an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the stamping layout of the positive current collector X provided in this embodiment of the utility model. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] As described in the background section, based on the current positive electrode current collector structure, an additional adhesive application step is added before sealing the battery cell, where insulating tape is applied to the positive electrode current collector. However, by adding this adhesive application step to prevent the positive electrode current collector from contacting the inside of the steel casing, battery manufacturing efficiency is reduced and manufacturing costs are increased.

[0018] In view of this, the present invention provides an improved positive current collector, which is hexagonal with a fishtail structure, and an insulating part is provided on the fishtail structure of the positive current collector. Thus, when manufacturing a tab battery, the positive current collector avoids contact with the inner wall of the steel shell due to the insulating part provided on the fishtail structure. Therefore, there is no need to perform an adhesive bonding step on the positive current collector, which can ensure that the positive current collector does not come into contact with the inner wall of the steel shell, thereby improving the manufacturing efficiency of the tab battery and reducing the manufacturing cost.

[0019] in, Figure 1 An exemplary schematic diagram of an optional structure of the positive current collector in an embodiment of this utility model is shown. For example... Figure 1 As shown, the positive current collector is a hexagonal structure with a fishtail. Specifically, the positive current collector may include a hexagonal structure a and a fishtail structure b. The fishtail structure b is connected to the hexagonal structure a based on two adjacent sides of the hexagonal structure a to form the positive current collector. An insulating portion 1 is provided on the fishtail structure b of the positive current collector. In an optional example, the length of the insulating portion 1 is 40%-70% of the length of the fishtail structure b, and the length of the fishtail structure b is equal to the side length of the hexagonal structure of the positive current collector.

[0020] It should be noted that the insulating part 1 provided on the fishtail structure b of the positive current collector in this embodiment of the present invention can be obtained by injection molding of insulating glue. Specifically, it can be obtained by injection molding after the hexagonal fishtail structure is formed.

[0021] It is understandable that by injecting insulating adhesive into specific parts (i.e., the fishtail structure) of the positive current collector with a specific structure (i.e., a hexagonal positive current collector with a fishtail structure) during the manufacturing stage, a positive current collector with an insulating part is obtained. Based on the insulating part set on the specific part, the positive current collector avoids contact with the inner wall of the steel shell, thereby eliminating the need to perform the adhesive application step on the positive current collector. This improves the manufacturing efficiency of the all-tab battery, reduces the manufacturing cost, and further avoids the occurrence of battery short circuits due to insufficient adhesion of the insulating tape, thus improving the performance stability of the battery.

[0022] As can be seen, the positive current collector of this utility model embodiment is a hexagonal structure with a fishtail, and an insulating part is provided on the fishtail structure of the positive current collector. Therefore, when manufacturing a tab battery, the positive current collector avoids contact with the inner wall of the steel shell based on the insulating part provided on the fishtail structure. Thus, there is no need to perform an adhesive application step on the positive current collector, which can ensure that the positive current collector does not contact the inner wall of the steel shell, thereby improving the manufacturing efficiency of the tab battery and reducing the manufacturing cost.

[0023] Reference Figure 1As shown, the positive current collector of this utility model embodiment may also be provided with welding holes 2.

[0024] In a specific example, the weld hole 2 can be designed as a circular hole. It should be noted that, since the positive electrode current collector has a circular hole, the wettability of the electrolyte can be effectively enhanced when performing the electrolyte injection operation during the fabrication of the all-tab battery.

[0025] In an optional implementation, to effectively demonstrate the enhancing effect of the weld holes on electrolyte wetting, in this embodiment of the invention, the weld holes on the positive current collector can be arranged corresponding to each side and the center point of the positive current collector, for example... Figure 1 As shown, there are 7 welding holes on the positive current collector.

[0026] In some embodiments, to enhance the soldering design for fabricating the all-tab battery and the welding quality with the core aluminum foil, a welding portion 3 may also be provided on the positive current collector of this utility model embodiment. The welding portion 3 may be based on the diagonal of the hexagonal structure a in the positive current collector, protruding from the side of the positive current collector facing the core (e.g., ...). Figure 1 The welded section indicated by the dashed line.

[0027] It should be noted that the positive current collector of this utility model embodiment can be obtained, for example, by using a stamping machine and a stamping die with a specific structure to stamp multiple hexagonal current collector blanks with fishtail structures onto a conductive material (e.g., aluminum sheet) that meets certain conditions. Furthermore, the hexagonal fishtail structure of the current collector blank allows for the rational and efficient use of raw materials during the manufacturing process of the positive current collector of this utility model embodiment, without generating edge waste. To clearly understand the rational and efficient use of raw materials during the manufacturing of the positive current collector of this utility model embodiment, Figure 2 An exemplary schematic diagram of the stamping layout of the positive current collector X according to an embodiment of the present invention is shown.

[0028] As can be seen, the positive current collector of this utility model embodiment is a hexagonal structure with a fishtail, and an insulating part is provided on the fishtail structure of the positive current collector. Therefore, when manufacturing a full-tab battery, the positive current collector avoids contact with the inner wall of the steel shell based on the insulating part provided on the fishtail structure. Thus, there is no need to perform an adhesive application step on the positive current collector, which can ensure that the positive current collector does not come into contact with the inner wall of the steel shell, thereby improving the manufacturing efficiency of the full-tab battery and reducing the manufacturing cost.

[0029] This utility model embodiment also provides a battery, including the above-described positive current collector.

[0030] The foregoing describes multiple embodiments of the present invention. The optional methods described in each embodiment can be combined and cross-referenced without conflict, thereby extending to a variety of possible embodiments. These can all be considered as embodiments disclosed or made public by the present invention.

[0031] While the embodiments of this utility model have been disclosed above, this utility model is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of this utility model; therefore, the scope of protection of this utility model should be determined by the scope defined in the claims.

Claims

1. A positive current collector, characterized in that, The positive current collector is hexagonal with a fishtail structure, and an insulating part is provided on the fishtail structure of the positive current collector.

2. The positive current collector according to claim 1, characterized in that, The positive current collector is also provided with welding holes.

3. The positive current collector according to claim 2, characterized in that, The weld hole is a circular hole, and the weld hole corresponds to each side and the center point of the positive current collector.

4. The positive current collector according to claim 1, characterized in that, The positive electrode current collector is also provided with a welding part, which protrudes from the diagonal of the hexagonal structure in the positive electrode current collector on the side of the positive electrode current collector facing the core.

5. A battery, characterized in that, Includes the positive current collector as described in any one of claims 1 to 4.

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