Cathode structure of carbon battery

Abstract

The utility model provides a negative electrode structure of a carbon battery. The negative electrode structure comprises a zinc cylinder, a negative electrode plate and an insulating gland which are sequentially overlapped along the axial direction of the battery, the insulating gland is of a cylindrical structure composed of an insulating gland bottom wall and an insulating gland peripheral wall. The bottom of the zinc cylinder and the negative plate are embedded in the insulating gland together; the upper surface of the negative plate is attached to the outer bottom surface of the zinc cylinder, and the lower surface of the negative plate is attached to the inner surface of the bottom wall of the insulating gland; the outer peripheral surface of the bottom of the zinc cylinder is attached to the inner surface of the peripheral wall of the insulating gland; a central hole is formed in the bottom wall of the insulating gland, the aperture of the central hole is smaller than the diameter of the negative plate, and a negative plate area corresponding to the central hole is a negative electrode external connection area of the carbon battery. According to the utility model, the bottom of the zinc cylinder and the negative plate are embedded in the insulating gland together, so that the insulating gland is radially limited; in addition, it can be guaranteed that a negative electrode external connection area is located in the center of the end face of the battery, and the packaging quality and normal use of the battery cannot be affected.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a carbon-zinc battery negative electrode structure. Background Technology

[0002] Carbon-zinc batteries, also known as zinc-manganese dry batteries, are primary cells in chemical power sources and are disposable. They are relatively inexpensive and mainly used in low-power electrical appliances such as clocks, doorbells, remote controls, calculators, and radios.

[0003] The positive electrode active material of a zinc-manganese dioxide dry cell battery is manganese dioxide, which can be electrolytic manganese dioxide, natural manganese dioxide, or chemically produced manganese dioxide. It also contains carbon materials for conductivity, such as acetylene black, graphite, graphene, and carbon nanotubes, or a mixture of several of these. The positive electrode active material also includes a small amount of zinc oxide, used to regulate the battery's opening voltage and suppress harmful metal impurities. The positive electrode electrolyte is a mixed aqueous solution of zinc chloride and ammonium chloride. The positive electrode current collector is a carbon rod. The negative electrode active material of a zinc-manganese dioxide dry cell battery is zinc, housed in a zinc cylinder. This zinc cylinder serves as the negative electrode active material, the container, and the negative electrode current collector. Both the positive electrode active material and the electrolyte are contained within the zinc cylinder. A positive terminal cap and a sealing ring are provided at the top opening of the zinc cylinder, and the sealing ring separates the positive terminal cap from the zinc cylinder. A negative electrode sheet and an insulating pressure ring are attached to the bottom outer surface of the zinc cylinder. A heat-shrinkable film and a metal outer skin are wrapped around the circumferential outer side of the zinc cylinder. The end of the heat-shrinkable film is covered on the insulating pressure ring by a heat-shrinking process, and the end of the metal outer skin is then covered on the heat-shrinkable film. The negative electrode sheet area corresponding to the central cavity of the insulating pressure ring serves as the negative electrode external part of the battery, which is used to contact the negative electrode of the electrical appliance to achieve power conduction. However, existing carbon-zinc batteries have the following problems during assembly: the diameter of the assembly consisting of the negative electrode sheet and the insulating ring is equal to the diameter of the zinc cylinder. After placing the assembly on the closed end face of the zinc cylinder with its central axis aligned with the central axis of the zinc cylinder, the end of the heat-shrinkable film is heat-shrinked. However, during the heat-shrinking process, the assembly often experiences radial displacement, causing the central axis of the assembly and the negative electrode sheet to deviate from the central axis of the battery. This results in the negative electrode external part of the battery being off-center from the battery end face, affecting not only the battery quality but also the normal connection and use of the negative electrode when the battery is installed in the battery compartment of an appliance. Utility Model Content

[0004] The purpose of this invention is to provide a carbon-zinc battery negative electrode structure that can avoid the problem of radial displacement of the negative electrode external contact area during battery packaging.

[0005] The technical solution to achieve the purpose of this utility model is: a carbon-zinc battery negative electrode structure, comprising a zinc cylinder, a negative electrode sheet, and an insulating cap stacked sequentially along the axial direction of the battery; the insulating cap is a cylindrical structure composed of an insulating cap bottom wall and an insulating cap peripheral wall; the bottom of the zinc cylinder and the negative electrode sheet are embedded together in the insulating cap; the upper surface of the negative electrode sheet is in contact with the outer bottom surface of the zinc cylinder, and the lower surface of the negative electrode sheet is in contact with the inner surface of the insulating cap bottom wall; the outer peripheral surface of the bottom of the zinc cylinder is in contact with the inner surface of the insulating cap peripheral wall; a central hole is provided on the bottom wall of the insulating cap, the diameter of the central hole is smaller than the diameter of the negative electrode sheet, and the area of ​​the negative electrode sheet corresponding to the central hole is the negative electrode external contact area of ​​the carbon-zinc battery.

[0006] This invention replaces the sheet-shaped insulating ring used in existing carbon batteries with a cylindrical insulating cap, and embeds the bottom of the zinc cylinder and the negative electrode sheet together within the insulating cap. During heat-shrink packaging of the battery, the heat-shrink film will not contact the negative electrode sheet at all, preventing radial displacement of the negative electrode sheet due to heat shrinkage. Furthermore, the insulating cap will not radially limit its position relative to the zinc cylinder. Since the area of ​​the negative electrode sheet corresponding to the central hole of the insulating cap is the external negative electrode area, even if the negative electrode sheet moves relative to the zinc cylinder during assembly, the position of the external negative electrode area remains unchanged. For example, if the negative electrode sheet is pre-positioned with its central axis aligned with the central axis of the zinc cylinder, the central axis of the negative electrode sheet will still be aligned with the central axis of the zinc cylinder after the heat-shrink film is applied, thus not affecting the battery packaging quality and normal use.

[0007] Furthermore, an insulating cap embedding groove is provided on the lower surface of the negative electrode sheet, and the bottom wall of the insulating cap is embedded in the insulating cap embedding groove. The insulating cap limiting embedding groove can enhance the positioning of the negative electrode sheet and prevent the negative electrode sheet from moving radially during the packaging process.

[0008] Furthermore, the bottom of the zinc cylinder is conical; the negative electrode sheet is also conical; and the outer peripheral surface of the bottom of the zinc cylinder and the outer peripheral surface of the negative electrode sheet form a continuous conical surface; the cross-sectional shape of the peripheral wall of the insulating cover is a right triangle, and the bottom of the zinc cylinder and the negative electrode sheet together complement the shape of the peripheral wall of the insulating cover, so that the bottom of the zinc cylinder, the negative electrode sheet and the insulating cover are assembled into a cylindrical shape, so as not to affect the subsequent coating of heat shrink film and metal outer skin.

[0009] Furthermore, the negative electrode external connection area is provided with an outwardly protruding negative electrode plate external boss, which is used to abut against the negative electrode of the electrical appliance to realize power supply. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the axial cross-sectional structure of the carbon-zinc battery negative electrode structure of this utility model.

[0011] Figure 2 for Figure 1 Enlarged view of section A;

[0012] Figure 3 This is a top view of the insulating cover of this utility model;

[0013] Figure 4 This is a bottom view of the carbon-zinc battery negative electrode structure of this utility model. Detailed Implementation

[0014] The preferred embodiment of the carbon-zinc battery negative electrode structure of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] Combination Figures 1-3 A carbon-zinc battery negative electrode structure includes a zinc cylinder 10, a negative electrode sheet 20, and an insulating cap 30 stacked sequentially along the axial direction of the battery. The insulating cap 30 is a cylindrical structure composed of an insulating cap bottom wall 31 and an insulating cap peripheral wall 32. The bottom 11 of the zinc cylinder 10 and the negative electrode sheet 20 are embedded together in the insulating cap 30. The upper surface of the negative electrode sheet 20 is in contact with the outer bottom surface of the zinc cylinder 10, and the lower surface of the negative electrode sheet 20 is in contact with the inner surface of the insulating cap bottom wall 31. The outer peripheral surface of the zinc cylinder bottom 11 is in contact with the inner surface of the insulating cap peripheral wall 32. The insulating cap bottom wall 31 has a central hole 310, the diameter of which is smaller than the diameter of the negative electrode sheet 20, and the negative electrode sheet area corresponding to the central hole 310 is the negative electrode external contact area of ​​the carbon-zinc battery.

[0016] Before packaging, the bottom 11 of the zinc cylinder 10 and the negative electrode 20 are pre-embedded in the insulating cover 30, so that the central axes of the zinc cylinder 10, the negative electrode 20 and the insulating cover 30 are aligned, and then the heat shrink film 40 and the metal outer skin 50 are packaged.

[0017] This invention embeds the bottom of the zinc cylinder 10 and the negative electrode sheet 20 together inside the cylindrical insulating cover 30, preventing the insulating cover 30 from being radially restricted relative to the zinc cylinder 10; and even if the negative electrode sheet 20 moves relative to the zinc cylinder 10 during the packaging process, it does not affect the position of the negative electrode external contact area, so that the negative electrode external contact area can remain unchanged before and after the heat shrink film is applied, thus avoiding affecting the battery packaging quality and normal use.

[0018] Furthermore, such as Figure 1 , Figure 2 , Figure 4As shown, an insulating cap embedding groove 21 is provided on the lower surface of the negative electrode 20. The bottom wall 31 of the insulating cap is embedded in the insulating cap embedding groove 21, and the insulating cap embedding groove 21 can be used to position the negative electrode 20. Of course, the insulating cap embedding groove 21 may not be provided on the negative electrode 20.

[0019] Furthermore, such as Figure 1 , Figure 2 As shown, the bottom 11 of the zinc cylinder 10 is conical; the negative electrode 20 is also conical; and the outer peripheral surface of the bottom 11 of the zinc cylinder and the outer peripheral surface of the negative electrode 20 form a continuous conical surface; the cross-sectional shape of the insulating cap peripheral wall 32 is a right-angled triangle. The bottom of the zinc cylinder 10 and the negative electrode 20 together complement the shape of the insulating cap peripheral wall 32, so that the bottom 11 of the zinc cylinder, the negative electrode 20 and the insulating cap 30 are assembled into a cylindrical shape, so as not to affect the subsequent coating of the heat-shrink film 40 and the metal outer skin 50. Of course, the bottom of the zinc cylinder 10 can be, but is not limited to, conical, or cylindrical; similarly, the cross-sectional shape of the insulating cap peripheral wall 32 can be, but is not limited to, a right-angled triangle.

[0020] Furthermore, such as Figure 1 , Figure 4 As shown, the negative electrode outer contact area is provided with an outwardly protruding negative electrode plate external protrusion 22, which is used to abut against the negative electrode of the electrical appliance to achieve power transmission. Of course, the negative electrode plate 20 may not have the negative electrode plate external protrusion 22.

[0021] The negative electrode 20 of this invention is made of stainless steel; the insulating cover 30 is made of plastic.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent process transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A carbon-zinc battery negative electrode structure, characterized in that: The battery comprises a zinc cylinder, a negative electrode sheet, and an insulating cap stacked sequentially along the axial direction of the battery. The insulating cap is a cylindrical structure composed of a bottom wall and a peripheral wall. The bottom of the zinc cylinder and the negative electrode sheet are embedded together within the insulating cap. The upper surface of the negative electrode sheet is in contact with the outer bottom surface of the zinc cylinder, and the lower surface of the negative electrode sheet is in contact with the inner surface of the bottom wall of the insulating cap. The outer peripheral surface of the bottom of the zinc cylinder is in contact with the inner surface of the peripheral wall of the insulating cap. A central hole is provided on the bottom wall of the insulating cap, the diameter of which is smaller than the diameter of the negative electrode sheet, and the area of ​​the negative electrode sheet corresponding to the central hole is the external negative electrode contact area of ​​the carbon-zinc battery.

2. The carbon-zinc battery negative electrode structure according to claim 1, characterized in that: The lower surface of the negative electrode sheet is provided with an insulating cover embedding groove, and the bottom wall of the insulating cover is embedded in the insulating cover embedding groove.

3. The carbon-zinc battery negative electrode structure according to claim 1, characterized in that: The bottom of the zinc cylinder is conical; the negative electrode plate is also conical; and the outer peripheral surface of the bottom of the zinc cylinder and the outer peripheral surface of the negative electrode plate form a continuous conical surface; the cross-sectional shape of the insulating cover is a right triangle, and the bottom of the zinc cylinder and the negative electrode plate together complement the shape of the insulating cover, so that the bottom of the zinc cylinder, the negative electrode plate and the insulating cover are assembled into a cylindrical shape.

4. The carbon-zinc battery negative electrode structure according to claim 1, characterized in that: The negative electrode external connection area is provided with an outwardly protruding negative electrode plate external protrusion.

Images