Negative assembly structure of carbon battery

Abstract

This invention provides a negative electrode assembly structure for a carbon-zinc battery, including a zinc cylinder and a negative electrode sheet attached to the outer bottom surface of the zinc cylinder; the upper surface of the edge portion of the negative electrode sheet is in contact with the outer bottom surface of the zinc cylinder; an insulating pressure ring is provided below the negative electrode sheet, and the lower surface of the edge portion of the negative electrode sheet is in contact with the upper surface of the insulating pressure ring; a downwardly recessed groove is provided on the upper surface of the edge portion; a protrusion corresponding to the groove is provided on the outer bottom surface of the zinc cylinder, and the protrusion and the groove interlock. The carbon-zinc battery of this invention achieves radial positioning of the negative electrode sheet through the interlocking of the protrusion and the groove. Furthermore, since the groove is located at the edge of the negative electrode sheet, the upward pressing force generated by the inward deformation of the heat-shrink film and the metal outer casing during battery packaging can directly act on the protrusion and the groove, ensuring stable interlocking and effectively preventing radial movement of the negative electrode sheet during battery packaging.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and more particularly to a negative electrode assembly structure for a carbon-zinc battery. 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 (in the shape of a disc) is attached to the bottom outer surface of the zinc cylinder. A heat-shrinkable film and a metal outer skin are wrapped around the circumference of the zinc cylinder. The end of the heat-shrinkable film covers the edge of the negative electrode sheet through a heat-shrinking process, and the end of the metal outer skin is covered with another heat-shrinkable film. The center position of the negative electrode sheet serves as the external negative terminal of the battery, which is used to contact the negative terminal of the electrical appliance to achieve power conduction. However, existing carbon-zinc batteries have the following problems during assembly: The diameter of the negative electrode is equal to the diameter of the zinc cylinder. After the negative electrode is placed 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-shrink film is heat-shrinked. However, during the heat-shrinking process, the negative electrode often experiences radial displacement (i.e., "deviation"), causing the central axis of the negative electrode to deviate from the central axis of the battery, affecting the packaging quality of the battery. Furthermore, the center of the negative electrode usually has an external negative electrode protrusion for contacting the negative electrode of the appliance to achieve power conduction. Deviation of the negative electrode will cause the external protrusion to deviate from the central axis of the battery, thus affecting the normal connection and use of the negative electrode when the battery is installed in the appliance's battery compartment. Utility Model Content

[0004] The purpose of this invention is to provide a negative electrode assembly structure for a carbon-zinc battery that can prevent radial misalignment of the negative electrode sheet during battery packaging.

[0005] The technical solution to achieve the purpose of this utility model is: a negative electrode assembly structure for a carbon-zinc battery, including a zinc cylinder and a negative electrode sheet attached to the outer bottom surface of the zinc cylinder; the upper surface of the edge portion of the negative electrode sheet is in contact with the outer surface of the bottom wall of the zinc cylinder; an insulating pressure ring is provided below the negative electrode sheet, and the lower surface of the edge portion of the negative electrode sheet is in contact with the upper surface of the insulating pressure ring; a downwardly recessed groove is provided on the upper surface of the edge portion; a protrusion corresponding to the groove is provided on the outer bottom surface of the zinc cylinder, and the protrusion and the groove engage with each other.

[0006] The carbon-zinc battery of this invention achieves radial positioning of the negative electrode sheet through the interlocking of the protrusion and the groove. Simultaneously, when heat-shrink film and metal sheath are packaged on the circumferential outer side of the zinc canister, the heat-shrink film shrinks inward to cover the lower surface of the insulating ring, and the metal sheath bends inward to cover the lower surface of the heat-shrink film. Since the groove is located at the edge of the negative electrode sheet, which is the coverage area of ​​the insulating ring, the upward pressing force generated by the inward deformation of the heat-shrink film and the metal sheath can directly act on the mating part of the protrusion and the groove, ensuring their stable interlocking. This effectively prevents radial movement of the negative electrode sheet during battery packaging with heat-shrink film and metal sheath, avoiding "deviation." This ensures that the negative electrode sheet and its external position remain unchanged before and after heat-shrink film packaging. For example, the central axes of the zinc canister, negative electrode sheet, and insulating ring are pre-aligned, and the central axis of the negative electrode sheet still coincides with the central axis of the zinc canister after heat-shrink film and metal sheath packaging, without affecting the battery packaging quality and normal use.

[0007] Furthermore, a positioning boss is provided on the lower surface of the negative electrode sheet, the positioning boss being located at the center of the edge of the negative electrode sheet; the positioning boss is inserted into the central hole of the insulating ring to position the insulating ring. Preferably, the negative electrode sheet is punched and deformed downwards to form the positioning boss on the lower surface of the negative electrode sheet.

[0008] Furthermore, the diameter of the negative electrode sheet is greater than the inner diameter of the insulating pressure ring, and the area of ​​the negative electrode sheet corresponding to the central hole of the insulating pressure ring is the negative electrode external contact area. Furthermore, the negative electrode external contact area is provided with an outwardly protruding negative electrode sheet external boss for contacting the negative electrode of the electrical appliance to achieve energization. In a specific implementation, the bottom wall of the zinc cylinder is punched downwards and deformed to form the protrusion on the outer bottom surface of the zinc cylinder.

[0009] The groove can be multiple dot-shaped grooves, and each groove is evenly distributed around its circumference.

[0010] The groove can also be an annular groove. Attached Figure Description

[0011] Figure 1This is a schematic diagram of the axial cross-sectional structure of a carbon-zinc battery with negative electrode positioning function, as shown in Example 1 or Example 2.

[0012] Figure 2 This is a bottom view of the zinc cylinder structure of Example 1;

[0013] Figure 3 This is a top view of the negative electrode sheet in Example 1;

[0014] Figure 4 This is a bottom view of the zinc cylinder structure in Example 2;

[0015] Figure 5 This is a top view of the negative electrode structure of Example 2. Detailed Implementation

[0016] The preferred embodiment of the negative electrode assembly structure of the carbon-zinc battery of this utility model will be described in detail below with reference to the accompanying drawings. Example 1

[0017] Combination Figures 1-3 A negative electrode assembly structure for a carbon-zinc battery includes a zinc cylinder 10 and a negative electrode sheet 20 attached to the outer bottom surface of the zinc cylinder 10; the upper surface of the edge portion 21 of the negative electrode sheet 20 is in contact with the outer bottom surface of the zinc cylinder 10; an insulating pressure ring 30 is provided below the negative electrode sheet 20, and the lower surface of the edge portion 21 of the negative electrode sheet 20 is in contact with the upper surface of the insulating pressure ring 30; a downwardly recessed groove 210 is provided on the upper surface of the edge portion 21; a protrusion 11 corresponding to the groove 210 is provided on the outer bottom surface of the zinc cylinder 10, and the protrusion 11 engages with the groove 210;

[0018] The groove 210 consists of four dot-shaped grooves, and each groove 210 is evenly distributed around its circumference. Example 2

[0019] The difference between the negative electrode assembly structure of the carbon-zinc battery in Example 2 and that in Example 1 is as follows: Figure 4 and Figure 5 As shown, the groove 210 can also be an annular groove, in which case the protrusion 11 is an annular protrusion.

[0020] Before packaging, the negative electrode 20 is assembled by interlocking the protrusion 11 with the groove 210, and the central axes of the zinc cylinder 10, the negative electrode 20 and the insulating pressure ring 30 are kept aligned. Then, heat shrink film 40 and metal outer skin 50 are packaged on the outer circumference of the zinc cylinder 10. The end of the heat shrink film 40 is folded inward to cover the lower surface of the insulating pressure ring 30, and the end of the metal outer skin 50 is bent inward to cover the lower surface of the heat shrink film 40.

[0021] In Examples 1 and 2, the carbon-zinc batteries achieve radial positioning of the negative electrode 20 through the interlocking of the protrusion 11 and the groove 210. Furthermore, the upward pressing force generated by the inward deformation of the heat-shrink film 40 and the metal outer skin 50 can directly act on the mating part of the protrusion 11 and the groove 210, ensuring that they are stably interlocked together. This effectively prevents the negative electrode 20 from radially moving during battery packaging of the heat-shrink film 40 and the metal outer skin 50, avoiding "deviation". After packaging the heat-shrink film and the metal outer skin, the central axis of the negative electrode 20 still coincides with the central axis of the zinc cylinder 10, which will not affect the battery packaging quality and normal use.

[0022] Furthermore, such as Figure 1 As shown, the bottom wall of the zinc cylinder 10 is deformed downwards to form the protrusion 11 on the outer surface of the bottom wall of the zinc cylinder 10, which is beneficial to expand the battery internal space and increase the filling amount of battery effective material.

[0023] Furthermore, such as Figure 1 As shown, a positioning boss 22 is provided on the lower surface of the negative electrode 20, and the positioning boss 22 is located on the center side of the edge portion 21 of the negative electrode 20; the positioning boss 22 is inserted into the center hole of the insulating pressure ring 30 to position the insulating pressure ring 30. In specific implementation, such as Figure 1 As shown, the negative electrode 20 is bent downwards to form the positioning boss 22 on its lower surface. Of course, the positioning boss 22 may not be provided on the negative electrode of this invention.

[0024] Furthermore, such as Figure 1 As shown, the diameter of the negative electrode 20 is greater than the inner diameter of the insulating ring 30, and the area of ​​the negative electrode corresponding to the central hole of the insulating ring 30 is the negative electrode outer contact area. Further, as... Figure 1 As shown, the negative electrode outer contact area is provided with an outwardly protruding negative electrode plate external protrusion 23, which is used to abut against the negative electrode of the electrical appliance to achieve power transmission. Of course, the negative electrode plate of this utility model may not have the negative electrode plate external protrusion 23.

[0025] In the specific implementation process, the bottom wall of the zinc cylinder 10 is pressed downward and deformed, thereby forming the protrusion 11 on the outer bottom surface of the zinc cylinder 10.

[0026] The negative electrode 20 is typically made of stainless steel.

[0027] The insulating pressure ring 30 is typically made of plastic.

[0028] 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 negative electrode assembly structure for a carbon-zinc battery, comprising a zinc cylinder and a negative electrode sheet attached to the outer bottom surface of the zinc cylinder; wherein the upper surface of the edge portion of the negative electrode sheet is in contact with the outer bottom surface of the zinc cylinder; characterized in that: An insulating pressure ring is provided below the negative electrode sheet, and the lower surface of the edge portion of the negative electrode sheet is in contact with the upper surface of the insulating pressure ring; a downwardly recessed groove is provided on the upper surface of the edge portion; a protrusion is provided on the outer bottom surface of the zinc cylinder that corresponds to the groove, and the protrusion and the groove engage with each other.

2. The negative electrode assembly structure of the carbon-zinc battery according to claim 1, characterized in that: A positioning boss is provided on the lower surface of the negative electrode sheet, and the positioning boss is located on the center side of the edge of the negative electrode sheet; the positioning boss is inserted into the center hole of the insulating ring to position the insulating ring.

3. The negative electrode assembly structure of the carbon-zinc battery according to claim 2, characterized in that: The negative electrode sheet is pressed downwards and deformed to form the positioning boss on the lower surface of the negative electrode sheet.

4. The negative electrode assembly structure of the carbon-zinc battery according to claim 1, characterized in that: The diameter of the negative electrode sheet is greater than the inner diameter of the insulating ring, and the area of ​​the negative electrode sheet corresponding to the central hole of the insulating ring is the negative electrode external contact area.

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

6. The negative electrode assembly structure of the carbon-zinc battery according to claim 1, characterized in that: The groove is a plurality of dot-shaped grooves, and each groove is evenly distributed around its circumference.

7. The negative electrode assembly structure of the carbon-zinc battery according to claim 1, characterized in that: The groove is an annular groove.

8. The negative electrode assembly structure of the carbon-zinc battery according to claim 1, characterized in that: The bottom wall of the zinc cylinder is deformed by downward pressing, thereby forming the protrusion on the outer bottom surface of the zinc cylinder.

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