Anode shell for lithium-manganese button cell

Abstract

The utility model provides a positive pole shell for a lithium-manganese button cell, which comprises a cylindrical positive pole shell body with only the top end open, a limiting bulge is fixedly arranged on the inner bottom surface of the cylindrical positive pole shell body, and the inner side surface of the limiting bulge and the inner bottom surface of the cylindrical positive pole shell body are enclosed together to form an annular positive pole piece fixing and embedding groove. According to the utility model, the positive plate is positioned through the limiting bulge, so that the positive plate can be ensured not to shift in the production and actual use processes and is always positioned in the middle of the battery, thereby ensuring the tight assembly of all parts in the battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of button cell, especially relates to a positive shell for lithium manganese button cell. BACKGROUND

[0002] Lithium manganese button cell is a kind of high-efficiency energy storage equipment, which is composed of four parts: positive material, negative material, separator and electrolyte. During the manufacturing process, the positive material is usually pressed into a small disc shape. However, in mass production, the positive sheet sometimes cannot be accurately placed in the center of the separator, resulting in a positional deviation. This deviation may cause poor contact inside the battery, leading to short-circuit anomalies and affecting its discharge performance. Especially when the button lithium manganese battery faces extreme test conditions, such as vibration or centrifugal force generated by high-speed rotation, the positive cake may be displaced or damaged, thereby affecting the overall performance stability of the battery. Therefore, ensuring the stable positioning of the positive material is crucial for battery performance. SUMMARY

[0003] The utility model aims at providing a positive shell for lithium manganese button cell that can ensure the stable positioning of the positive material.

[0004] The technical solution to achieve the purpose of the utility model is: a positive shell for lithium manganese button cell, comprising a cylindrical positive shell body with only the top end open, a limiting protrusion is fixedly arranged on the inner bottom surface of the cylindrical positive shell body, and the inner side surface of the limiting protrusion and the inner bottom surface of the cylindrical positive shell body together enclose an annular positive sheet fixing and embedding groove.

[0005] The positive shell of the utility model realizes the positioning of the positive sheet through the limiting protrusion fixedly arranged on the inner bottom surface of the positive shell body, which can ensure that the positive sheet does not shift radially during production and actual extreme conditions (such as vibration or centrifugal force generated by high-speed rotation), and is always in the center of the battery, thereby ensuring the tight assembly between the internal components of the battery.

[0006] The limiting protrusion can be composed of at least three circumferentially spaced protrusions. Further, the protrusions are preferably uniformly arranged. Further, each protrusion is an arc-shaped band structure extending in the circumferential direction. At this time, the inner arc surfaces of all the protrusions and the inner bottom surface of the cylindrical positive shell body together enclose the positive sheet fixing and embedding groove.

[0007] The limiting protrusion can also be a protruding ring, the ring core of the protruding ring coincides with the central axis of the cylindrical positive shell body, and the inner side surface of the protruding ring and the inner bottom surface of the cylindrical positive shell body together enclose the positive sheet fixing and embedding groove.

[0008] Further, the side of the limiting protrusion facing the positive plate fixing embedding groove (i.e. the inner side of the limiting protrusion) is coated with a conductive adhesive layer to enhance conductivity.

[0009] The limiting protrusion and the cylindrical positive shell body are preferably integrally formed.

[0010] Further, the cross section of the limiting protrusion is preferably cylindrical. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a top view of the positive shell for a lithium-manganese button cell of Example 1, wherein the dashed line frame is the outer contour line of the positive plate;

[0012] Figure 2 is a sectional view of the positive shell for a lithium-manganese button cell of Example 1 along Figure 1 the A-A line;

[0013] Figure 3 is a top view of the positive shell for a lithium-manganese button cell of Example 2. DETAILED DESCRIPTION

[0014] The preferred embodiments of the positive shell for a lithium-manganese button cell of the present application will be described in detail below with reference to the accompanying drawings. Example 1

[0015] In combination with Figure 1 and Figure 2 , a positive shell for a lithium-manganese button cell includes a cylindrical positive shell body 10 with only the top end open, a limiting protrusion 20 fixed on the inner bottom surface 11 of the cylindrical positive shell body 10, and the inner side of the limiting protrusion 20 and the inner bottom surface 11 of the cylindrical body 10 together form a ring-shaped positive plate fixing embedding groove 30. The limiting protrusion 20 is composed of four circumferentially spaced protrusions. Example 2

[0016] As shown in Figure 3 , the positive shell for a lithium-manganese button cell of Example 2 differs from that of Example 1 in that, as shown in Figure 3 , the limiting protrusion 20 can also be a protruding ring, the ring core of the protruding ring coincides with the central axis of the cylindrical positive shell body 10, and the inner side of the protruding ring and the inner bottom surface 11 of the cylindrical positive shell body 10 together form a positive plate fixing embedding groove 30.

[0017] For the positive shell of lithium-manganese button cell of the embodiment 1 and the embodiment 2, in the process of making the cell, the positive plate 40 is placed in the positive plate fixing embedding groove 30, the positioning of the positive plate 40 is realized through the limiting protrusion 20, the displacement of the positive plate 40 in the production and actual use process can be ensured, the positive plate 40 is always in the middle of the cell, so that the tight assembly between the parts in the cell is ensured.

[0018] Of course, the number of the protrusion 20 of the embodiment 1 can be but is not limited to four in the drawing, and can be three or more than four.

[0019] Further, as shown in the drawing, Figures 1 to 3 The side of the limiting protrusion 20 facing the positive plate fixing embedding groove 30 (i.e. the inner side of the limiting protrusion 20) is coated with a conductive glue layer 50 to enhance the conductivity. Of course, the side of the limiting protrusion 20 can also not be coated with the conductive glue layer 50.

[0020] The limiting protrusion 20 and the cylindrical positive shell body 10 are preferably integrally formed.

[0021] Further, as shown in the drawing, Figure 2 The cross section of the limiting protrusion 20 is preferably cylindrical. Of course, the protrusion 20 can only be able to play a radial limiting role on the positive plate 40.

[0022] In addition, the positive shell of lithium-manganese button cell of the embodiment 1 can also be improved as follows:

[0023] (1) As shown in the drawing, Figure 1 The protrusions are preferably uniformly arranged. Of course, the spacing between the protrusions can also be unequal;

[0024] (2) Combined with Figure 1 And Figure 2 Each of the protrusions is an arc-shaped band structure extending in the circumferential direction, at this time, the inner arc surface of all the protrusions 20 and the inner bottom surface 11 of the cylindrical positive shell body 10 together enclose the positive plate fixing embedding groove 30. Of course, the protrusions can be but are not limited to arc-shaped band structures, and can also be cylindrical or other common shapes.

[0025] The above is only an embodiment of the present application, and does not limit the patent range of the present application, any equivalent process transformation using the content of the present application specification, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A positive electrode shell for a lithium-manganese button cell, comprising a cylindrical positive electrode shell body with only the top end open, characterized in that: A limiting protrusion is fixedly provided on the inner bottom surface of the cylindrical positive electrode shell body, and the inner side surface of the limiting protrusion and the inner bottom surface of the cylindrical positive electrode shell body together form an annular positive electrode sheet fixing embedding groove.

2. The positive electrode shell for lithium manganese button battery according to claim 1, characterized in that: The limiting protrusion is composed of at least three protrusions arranged at intervals around the circumference.

3. The positive electrode shell for lithium manganese button cell according to claim 2, characterized in that: The protrusions are evenly arranged.

4. The positive electrode shell for lithium-manganese button battery according to claim 2, characterized in that: Each of the protrusions is an arc-shaped belt structure extending circumferentially.

5. The positive electrode shell for lithium manganese button cell according to claim 1, characterized in that: The limiting protrusion is a convex ring, the center of the convex ring coincides with the central axis of the cylindrical positive electrode shell body, and the inner side surface of the convex ring and the inner bottom surface of the cylindrical positive electrode shell body together enclose a positive electrode sheet fixing embedding groove.

6. The positive electrode shell for lithium manganese button cell according to claim 1, characterized in that: A conductive adhesive layer is applied on the side of the limiting protrusion facing the positive electrode plate fixing embedding groove.

7. The positive electrode shell for lithium manganese button cell according to claim 1, characterized in that: The limiting protrusion is integrally formed with the cylindrical positive electrode shell body.

8. The positive electrode shell for lithium manganese button cell according to claim 1, characterized in that: The cross section of the limiting protrusion is cylindrical.

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