Button cell protection shell with high sealing performance and button cell

Abstract

The utility model provides a button cell protection shell with high sealing performance and a button cell, the button cell protection shell comprises a first pole shell and a second pole shell, and pits are uniformly distributed on the surface of the opening end wall of the first pole shell along the circumferential direction; an annular sealing material layer is integrally formed on the surface of the opening end wall of the first pole shell in an injection molding mode, and the sealing material layer covers the concave pit and fills and levels up the concave pit; and an annular sealant layer is also arranged between the inner surface of the second pole shell and the outer surface of the sealing material layer. The button cell protection shell and the button cell using the button cell protection shell have better sealing performance, the cell does not leak liquid after being stored for a long time, a button cell production line is easy to refit, and the refit cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a button-type battery protective shell with high sealing performance and a button-type battery. Background Art

[0002] Button batteries have the characteristics of high energy density, compact size, and safe structure, and are widely used in various electronic devices such as biology, medical treatment, and animal husbandry. However, the existing common button battery protective shell structure is: including a positive electrode shell, a negative electrode shell and an insulating sealing ring, the positive electrode shell and the negative electrode shell are both cup-shaped, and the positive electrode shell and the negative electrode shell can be opened up and down to form a cylindrical button battery shell; the positive electrode shell and the negative electrode shell partially overlap in the vertical direction, and a gap is left between the open end wall of the positive electrode shell and the open end wall of the negative electrode shell. The insulating sealing ring fills the gap to electrically isolate the positive electrode shell from the negative electrode shell, and the open end wall of the positive electrode shell is located outside the open end wall of the negative electrode shell, and the open end of the open end wall of the positive electrode shell is bent inward and presses the insulating sealing ring inward to achieve battery sealing. The existing button battery protective shell structure is not sufficiently sealed, and leakage will occur during long-term storage of the battery. Factors such as long battery storage time and poor storage conditions are all causes of battery leakage. Battery leakage will cause battery performance to decline or even battery failure.

[0003] In the prior art, the means to enhance the sealing of button batteries are mostly: changing the shape of the opening end wall of the positive and negative electrode shells, for example: a button battery with enhanced sealing performance disclosed in the Chinese patent with the authorization announcement number CN214505613U, in which the side walls of the positive and negative electrode shells are formed by a multi-stage bent sealing wall, so that when the shell is sealed, the side wall of the shell can be combined with the insulating sealing ring to increase the combined surface area to achieve improved sealing performance; a high-sealing lithium-manganese button battery disclosed in the Chinese patent with the authorization announcement number CN218939734U, in which a positive hook ring and a negative hook ring that can be hooked to each other are arranged between the positive electrode shell and the negative electrode shell, and a solidifiable sealant is filled between the positive hook ring and the negative hook ring to achieve a sealed connection between the positive electrode shell and the negative electrode shell. However, the above-mentioned existing improvement schemes for enhancing the sealing performance of button batteries will involve the adjustment of many equipment such as the positive and negative electrode shell processing production line, the insulating sealing ring processing production line, and the sealing process in the battery assembly production line, which has a huge cost investment and is not suitable for battery manufacturers with established scale. Utility Model Content

[0004] The first object of the utility model is to provide a button-type battery protection case with high sealing performance, which can improve the problem of insufficient sealing performance of button-type battery protection cases in the prior art.

[0005] A button-type battery protective case with high sealing performance comprises a first pole case and a second pole case, wherein the first pole case and the second pole case are both cup-shaped, and the first pole case and the second pole case have upper and lower openings that are relatively buckled;

[0006] The first pole housing and the second pole housing partially overlap in the axial direction, the open end wall of the first pole housing is located inside the open end wall of the second pole housing, and an annular cavity is left between the open end wall of the first pole housing and the open end wall of the second pole housing;

[0007] The surface of the opening end wall of the first pole housing is provided with pits evenly distributed along the circumference thereof;

[0008] An annular sealing material layer is integrally injection-molded on the surface of the opening end wall of the first pole housing, wherein the sealing material layer covers the pit and fills the pit;

[0009] The sealing material layer extends along the surface of the first pole housing into the annular cavity and fills the annular cavity;

[0010] An annular sealant layer is also provided between the inner surface of the second pole shell and the outer surface of the sealing material layer.

[0011] The utility model sets a pit on the surface of the first pole shell, and forms the sealing material layer on the surface of the first pole shell by injection molding, so that the sealing material layer covers the pit setting and fills the pit, thereby strengthening the fitting effect between the sealing material layer and the first pole shell, and strengthening the sealing of the first pole shell and the sealing material layer; at the same time, the sealant layer can strengthen the seal between the second pole shell and the sealing material layer, thereby greatly strengthening the sealing between the first pole shell and the second pole shell, and the battery will not leak during long-term storage. In addition, the overall shape of the first pole shell, the sealing material layer and the second pole shell does not change much, and only needs to add a pit forming device on the surface of the pole shell. The original pole shell processing production line, the sealing material layer processing production line and the related sealing processes in the battery assembly production line do not need to be changed, and the production line is easy to modify, reducing the modification cost.

[0012] Preferably, the diameter of the pit is 20-80 nm, and the pit depth is 10-40 nm. The utility model forms nanoscale pits on the surface of the first pole shell to maximize the bonding area between the sealing material layer and the first pole shell and strengthen the sealing between the two.

[0013] Furthermore, the pit is arranged on the inner surface of the open end wall of the first pole case; the sealing material layer extends downward along the inner surface of the open end wall of the first pole case and bends outward so as to wrap the edge of the open end wall of the first pole case therein, and the outer end of the sealing material layer then extends upward along the outer surface of the open end wall of the first pole case.

[0014] Furthermore, the bottom surface and the outer surface of the sealing material layer are both in contact with the inner surface of the second pole shell, and the sealant layer is located at the connection position between the bottom wall and the open end wall of the second pole shell.

[0015] The second object of the utility model is to provide a button-type battery, comprising the highly sealed button-type battery protective shell described in the first object of the present invention, wherein the button-type battery protective shell contains a negative lithium sheet, a positive electrode cake, a diaphragm and an electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the axial cross-sectional structure of a button-type battery protective case and a button-type battery with high sealing performance of the utility model;

[0017] Figure 2 yes Figure 1 A magnified view of part A;

[0018] Figure 3 This is a schematic diagram of the axial structure of the first pole shell of the utility model;

[0019] Figure 4 It is a schematic diagram of the pit structure of the utility model. DETAILED DESCRIPTION

[0020] The following is a detailed description of the specific implementation of the button battery protective case and button battery with high sealing performance of the utility model in conjunction with the accompanying drawings:

[0021] Combination Figure 1 to Figure 3 A button-type battery protective case with high sealing performance comprises a first pole shell 10 and a second pole shell 20, wherein the first pole shell 10 and the second pole shell 20 are both cup-shaped, and the first pole shell 10 and the second pole shell 20 have upper and lower openings that are relatively buckled;

[0022] The first pole housing 10 and the second pole housing 20 partially overlap in the axial direction, the opening end wall 11 of the first pole housing 10 is located inside the opening end wall 21 of the second pole housing 20, and an annular cavity is left between the opening end wall 11 of the first pole housing and the opening end wall 21 of the second pole housing;

[0023] The surface of the opening end wall 11 of the first pole housing is provided with pits 110 evenly distributed along its circumference;

[0024] An annular sealing material layer 30 is integrally injection-molded on the surface of the opening end wall 11 of the first pole housing, and the sealing material layer 30 covers the pit 110 and fills the pit 110;

[0025] The sealing material layer 30 extends along the surface of the first pole housing 10 into the annular cavity and fills the annular cavity;

[0026] An annular sealant layer 40 is further provided between the inner surface of the second pole housing 20 and the outer surface of the sealing material layer 30 .

[0027] Combination Figure 1 to Figure 3 A button battery using the above-mentioned highly sealed button battery protective shell of the utility model comprises the highly sealed button battery protective shell, wherein the button battery protective shell contains a negative lithium sheet 50, a positive electrode cake 60, a separator 70 and an electrolyte.

[0028] The highly sealed button-type battery protective case of the utility model greatly strengthens the sealing between the first pole shell 10 and the second pole shell 20 through the arrangement of the pit 110 and the sealant layer 40, thereby improving the sealing of the button-type battery, so that the battery will not leak even if it is stored for a long time. In addition, the original pole shell processing production line, the sealing material layer processing production line, and the relevant sealing processes in the battery assembly production line do not need to be changed, and the production line is easy to modify, reducing the modification cost.

[0029] Preferably, Figure 4 As shown, the opening diameter R of the pit 110 is 20-80 nm, and the pit depth H is 10-40 nm. The utility model forms nanoscale pits on the surface of the first pole shell 10 to maximize the fitting area between the sealing material layer 30 and the first pole shell 10 and strengthen the sealing between the two. Of course, the opening diameter R and the pit depth H of the pit 110 can be but not limited to the above-mentioned specific sizes, which can be adjusted according to processing conditions and product requirements. In the specific implementation process, nanoscale pits can be formed on the surface of the first pole shell 10 by nano-etching technology.

[0030] Preferably, combined Figure 1 to Figure 3 , the pit 110 is arranged on the inner surface of the opening end wall 11 of the first pole case 10; the sealing material layer 30 extends downward along the inner surface of the opening end wall 11 of the first pole case 10 and bends outward to wrap the edge of the opening end wall 11 of the first pole case 10 therein, and the outer end of the sealing material layer 30 extends upward along the outer surface of the opening end wall of the first pole case 10. Of course, the pit 110 can also be arranged on the outer surface of the opening end wall 11 of the first pole case.

[0031] Furthermore, Figure 1 As shown, the bottom surface and the outer surface of the sealing material layer 30 are both in contact with the inner surface of the second pole housing 20, and the sealant layer 40 is located at the connection position between the bottom wall of the second pole housing 20 and the open end wall 21. Of course, the sealant layer 40 can be located at any position between the bottom surface and the outer surface of the sealing material layer 30 and the inner surface of the second pole housing 20, but the sealing effect is best when it is located at the connection position between the bottom wall of the second pole housing 20 and the open end wall 21.

[0032] Of course, the shapes of the first pole shell 10, the second pole shell 20, and the sealing material layer 30 of the present invention are not limited to the specific shapes in the drawings, and they can be existing button-type battery protective shells assembled from the shapes of the first pole shell 10, the second pole shell 20, and the sealing material layer 30 in any shape. In addition, the button-type battery is not limited to the lithium-manganese button-type battery "including the negative lithium sheet 50 and the positive electrode cake 60", and it is applicable to any type of existing button-type batteries.

[0033] For ordinary technicians in the technical field to which the utility model belongs, the utility model can make several simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as falling within the protection scope of the utility model.

Claims

1. A button-type battery protective case with high sealing performance, comprising a first pole case and a second pole case, wherein the first pole case and the second pole case are both cup-shaped, and the upper and lower openings of the first pole case and the second pole case are relatively buckled; the first pole case and the second pole case partially overlap in the axial direction, the open end wall of the first pole case is located on the inner side of the open end wall of the second pole case, and an annular cavity is left between the open end wall of the first pole case and the open end wall of the second pole case; characterized in that: The surface of the opening end wall of the first pole housing is uniformly provided with pits along its circumference; an annular sealing material layer is integrally injection-molded on the surface of the opening end wall of the first pole housing, and the sealing material layer covers the pits and fills the pits; The sealing material layer extends along the surface of the first pole housing into the annular cavity and fills the annular cavity; An annular sealant layer is also provided between the inner surface of the second pole shell and the outer surface of the sealing material layer.

2. The button-type battery protective case with high sealing performance according to claim 1, characterized in that: The diameter of the pit is 20-80 nm, and the depth of the pit is 10-40 nm.

3. The button-type battery protective case with high sealing performance according to claim 1, characterized in that: The pit is arranged on the inner surface of the open end wall of the first pole case; the sealing material layer extends downward along the inner surface of the open end wall of the first pole case and bends outward so as to wrap the edge of the open end wall of the first pole case therein, and the outer end of the sealing material layer then extends upward along the outer surface of the open end wall of the first pole case.

4. The button-type battery protective case with high sealing performance according to claim 1, characterized in that: The bottom surface and the outer surface of the sealing material layer are both in contact with the inner surface of the second pole shell, and the sealant layer is located at the connection position between the bottom wall and the opening end wall of the second pole shell.

5. A button battery, characterized in that: The invention comprises a button-type battery protective shell with high sealing performance as claimed in any one of claims 1 to 4, wherein a negative lithium electrode sheet, a positive electrode cake, a separator and an electrolyte are contained in the button-type battery protective shell.

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