CN213583899U - Button type lithium ion battery - Google Patents

Abstract

The utility model relates to a lithium ion battery field discloses a knot formula lithium ion battery. The laminated sheet comprises positive plates and negative plates, a diaphragm is arranged between each positive plate and each negative plate at intervals, electrolyte is soaked in the laminated sheet, and positive lugs and negative lugs of the laminated sheet are respectively connected with electrodes on the shell; the shell is sealed, the laminated body is packaged in the shell, the shell comprises a first top cover, a second top cover and a cylindrical shell wall located between the first top cover and the second top cover, the first top cover and the second top cover are parallel and opposite, and the outer contour of the cross section, parallel to the first top cover and the second top cover, of the cylindrical shell wall is oval. By adopting the technical scheme, the assembly matching degree of the battery and the personalized intelligent wearable product is favorably improved, and the flexible design of the intelligent wearable product is more convenient.

Description

Button type lithium ion battery

Technical Field

The utility model relates to a lithium ion battery makes the field, especially relates to a knot formula lithium ion battery.

Background

With the wider application of intelligent wearable products, people have wider and wider requirements on small-size lithium ion button type secondary rechargeable batteries (button type lithium ion batteries for short). The more and more intelligent wearing products of being applied to of knot formula lithium ion battery for wireless bluetooth headset etc. along with knot formula lithium ion battery's application is wider and wider, and the specification requirement of knot formula lithium ion battery is more and more diversified.

Disclosure of Invention

An object of the embodiment of the utility model is to provide a knot formula lithium ion battery adopts this technical scheme to be favorable to improving the assembly matching degree that product was dressed to battery and individualized intelligence, and the nimble design of product is dressed to the intelligence of being more convenient for.

The embodiment of the utility model provides a pair of knot formula lithium ion battery, include:

the laminated sheet comprises positive plates and negative plates, a diaphragm is arranged between each positive plate and each negative plate at intervals, electrolyte is soaked in the laminated sheet, and positive lugs and negative lugs of the laminated sheet are respectively connected with electrodes on the shell;

the casing is sealed, the lamination encapsulation is in the casing, the casing includes first top cap, second top cap and is located the tube-shape conch wall between first top cap, the second top cap, first top cap, second top cap are parallel relative, the tube-shape conch wall be on a parallel with the outer profile of the cross section of first top cap, second top cap is oval.

Optionally, the housing comprises:

a first pole piece including the first top cover and a first shell wall surrounding the first top cover,

a second diode housing including the second top cap and a second housing wall surrounding the second top cap,

the outer contours of the cross sections, parallel to the first top cover and the second top cover, of the first pole shell and the second pole shell are respectively oval;

one of the positive tab and the negative tab of the laminated sheet body is connected with the inner surface of the first top cover, and the other of the positive tab and the negative tab of the laminated sheet body is connected with the inner surface of the second top cover, wherein the first top cover and the second top cover are electrodes on the shell respectively;

the first top cover and the second top cover are parallel, the second shell wall is sleeved with the opening of the first shell wall in a sleeved mode, the second shell wall is sleeved outside the first polar shell, and an insulating piece used for insulating and isolating the first polar shell and the second polar shell is arranged between the first shell wall and the second shell wall.

Optionally, the insulating member is injection molded between the first casing wall and the second casing wall, and is hermetically integrated with the first casing wall and the second casing wall on both sides of the insulating member.

Optionally, the insulator entirely covers the inner wall of the second housing wall.

Optionally, the insulator further covers the end face of the first housing wall.

Optionally, the inner wall of the insulator is flush with the inner wall of the first housing wall.

Optionally, the insulator further entirely covers and bonds with the outer wall of the first housing wall.

Optionally, the insulating member further covers the end face of the second casing wall, covers the entire outer wall of the second casing wall, and is combined with the outer wall of the second casing wall.

Optionally, the insulator is an insulating sealing ring sleeved on the first shell wall, the second shell wall is sleeved outside the insulating sealing ring,

the opening section of the second shell wall is bent and tightly pressed outside the insulating sealing ring, and the insulating sealing ring compresses and seals a gap between the first shell wall and the second shell wall.

Optionally, the housing comprises:

a first housing including the first top cover and a first housing wall surrounding the first top cover, an outer contour of a cross section of the first housing parallel to the first top cover is an ellipse,

the second top cover comprises a first pole cover, a second pole cover and an injection molding insulator, wherein the inner periphery of the injection molding insulator is combined with the outer periphery of the first pole cover in an injection molding mode, the outer periphery of the injection molding insulator is combined with the outer periphery of the second pole cover in an injection molding mode, the outer periphery of the second top cover is connected with the opening end of the first shell wall in a sealing mode, and the first pole cover and the second pole cover are electrodes on the shell respectively.

Optionally, the outer contour of each positive plate, each negative plate and each layer of diaphragm in the laminated stack is oval.

It can be seen from above that, the outline of the cross section of the casing of the button lithium ion battery of this embodiment, which is parallel to the first top cap and the second top cap, is oval, so as to better satisfy the assembly requirements of the intelligent wearable device.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute an undue limitation on the invention.

Fig. 1 is a schematic view of a button-type lithium ion battery provided in embodiment 1 of the present invention;

fig. 2 is a schematic view of a top view structure of a button-type lithium ion battery provided in embodiment 1 of the present invention;

fig. 3 is a schematic side view of a button-type lithium ion battery provided in embodiment 1 of the present invention;

fig. 4 is a schematic structural diagram of a main view section in a button-type lithium ion battery provided in embodiment 2 of the present invention;

fig. 5 is a schematic structural diagram of a main view section in a button-type lithium ion battery provided in embodiment 3 of the present invention;

fig. 6 is a schematic structural diagram of a side view profile of a button-type lithium ion battery provided in embodiment 3 of the present invention;

fig. 7 is a schematic structural diagram of a button-type lithium ion battery according to embodiment 3 of the present invention, viewed from above and viewed from below;

fig. 8 is an exploded schematic view of a first housing and a second top cap of a button-type lithium ion battery provided in embodiment 4 of the present invention;

fig. 9 is a schematic view of a button-type lithium ion battery according to embodiment 4 of the present invention;

fig. 10 is a schematic side view of a button-type lithium ion battery provided in embodiment 4 of the present invention;

fig. 11 is a schematic top view of a button-type lithium ion battery provided in embodiment 4 of the present invention.

Reference numerals:

1: a first pole piece; 11: a first top cover; 12: a first shell wall;

2: a second pole piece; 21: a second top cover; 22: a second shell wall;

3: an insulating member;

5: insulating seal ring

6: a first housing; 61 a first shell wall;

71: a first pole cap; 72: a second pole cap; 73: and (4) injection molding an insulator.

Detailed Description

The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.

Example 1

The embodiment provides a button lithium ion battery, which mainly comprises a laminated sheet body and a shell, wherein the laminated sheet body is formed by laminating a positive plate and a negative plate, a diaphragm layer is arranged between each positive plate and each negative plate, and the diaphragm can be laminated in a Z-shaped folding mode or can be laminated between the positive plate and the negative plate in a single-plate laminating mode. Electrolyte is soaked in the laminated body, and the positive electrode lug and the negative electrode lug of the laminated body are respectively connected with the electrodes on the shell to supply power to the outside.

Referring to fig. 1-3, the housing is a sealed housing and the laminations are sealed within the housing. The housing includes: the first top cover 11 and the second top cover 21 are positioned at two ends of the shell, and the cylindrical shell wall is positioned between the first top cover 11 and the second top cover 21, the first top cover 11 and the second top cover 21 are parallel and opposite, and the outline of the cross section of the whole shell, which is parallel to the first top cover 11 and the second top cover 21, is elliptical, so that the assembly requirement of the intelligent wearable device is better met. In the present embodiment, the case is illustrated as a straight cylinder, but the case is not limited thereto.

As an indication of the embodiment, the positive plate and the negative plate having the same outline as the outline of the casing are adopted in the laminated body of the embodiment, that is, the outlines of each positive plate, each negative plate and each layer of diaphragm in the laminated body are correspondingly slightly smaller than the ellipse of the casing.

Example 2:

referring to fig. 4, a top view and a bottom view of the housing of the present embodiment are schematically shown in the same manner as fig. 2.

As an illustration of the present embodiment, the housing of the present embodiment includes: the pole piece comprises a first pole shell 1, a second pole shell 2 and an insulating piece 3 which is formed between the first pole shell 1 and the second pole shell 2 in an injection molding mode and is combined with the first pole shell 1 and the second pole shell 2. The first pole shell 1 and the second pole shell 2 are insulated and isolated by the insulating piece 3, one of the first pole shell and the second pole shell serves as a positive pole shell, and the other one serves as a negative pole shell. For convenience of description, the present embodiment uses the first electrode can 1 located at the inner layer as the positive electrode can, and the second electrode can 2 located at the outer layer as the negative electrode can, but is not limited thereto.

The first pole piece 1 can be, but is not limited to, formed by stamping a thin metal sheet, and includes a first top cover 11 and a first shell wall 12 vertically surrounding the first top cover 11, one end of the first pole piece 1 is open, the other end is a first top cover 11, which can be, but is not limited to, a column, the opening is located at the opposite end of the first top cover 11, wherein the cross section of the column is circular or oval or rectangular, square or other irregular shape.

Similarly, the second pole housing 2 can be formed by stamping a thin metal sheet, but is not limited to be formed by stamping, and includes a second top cover 21 and a second housing wall 22 vertically surrounding the second top cover 21, and the shape of the second pole housing 2 is the same as that of the first pole housing 1, and is slightly wider than the first pole housing so as to be sleeved outside the first pole housing 1. One end of the second pole case 2 is open, and the other end is a second top cap 21, which may be, but is not limited to, a cylinder shape, with the opening located at the opposite end of the second top cap 21. Wherein the cross section of the column is round or oval or rectangular, square or other irregular shape.

During preparation, a laminated sheet body (which is soaked with electrolyte in advance) of a lithium ion battery is placed in a first pole shell 1 serving as a positive pole shell, a positive pole lug of the laminated sheet body is welded to the inner surface of a first top cover 11, a negative pole lug of the laminated sheet body is welded to the inner surface of a second top cover 21 of a second pole shell 2 serving as a negative pole, the first pole shell 1 (containing a battery placed in the first pole shell) and the second pole shell 2 are placed on a preset injection mold, openings of the first pole shell 1 and the second pole shell 2 are opposite, the first top cover 11 and the second top cover 21 are opposite, the second shell wall 22 is sleeved outside a first shell wall 12, the laminated sheet body in the first pole shell 1 is sealed outside the injection mold, and a molten plastic body is prevented from contacting the laminated sheet body to avoid high-temperature damage.

The injection molding equipment is adopted, high-temperature melting injection molding plastic bodies are injected, the colloid is cooled and solidified to form the insulating part 3 which is integrated with the first shell wall 12 and the second shell wall 22 in an injection molding way, the insulating part 3 is formed between the first shell wall 12 and the second shell wall 22 which are sleeved inside and outside, and the sealing connection between the first shell wall 12 and the second shell wall 22 is realized.

The insulating member 3 of the present embodiment may be a polymer insulating material in the prior art, and may be, but is not limited to, one or a mixture of at least two or more of polypropylene material, polyethylene, perfluoroalkyl, polyether ketone, polyether ether ketone, and polyphenylene sulfide. In addition, pigment materials can be mixed into the high polymer insulating materials to enrich the colors of the button type lithium ion battery.

It can be seen from the above that, inwards compress tightly the pole casing that is located the outer layer through mechanical pressure for thereby it deforms and sticiss the sealing washer and realize the technical scheme of sealed button lithium ion battery, the leakproofness of button battery among the prior art is influenced by the rigidity of outer pole casing, if the thickness of pole casing is thinner then its rigidity is weaker, restore the defect of deformation easily or the easy deformation under external force and probably influence the leakproofness of casing after mechanical compression deformation. The casing of the button lithium ion battery of the present embodiment is an integrated sealing structure, and the sealing performance is not affected by the thickness and rigidity of the second casing wall 22 of the outer layer, so that the sealing performance is more reliable. Moreover, the technical solution of the present embodiment is suitable for button lithium ion batteries of various shapes, and is suitable for both a cylindrical shape with a regular shape (such as but not limited to a cylindrical shape or a square cylindrical shape or a cylindrical shape with other cross-sectional shapes) and a housing with an irregular three-dimensional structure.

As an illustration of the embodiment, when performing injection molding, the inner wall of the second shell wall 22 of the outer second electrode shell 2 is completely covered by the molten colloid, and compared with a non-completely covered structure, the completely covered structure improves the tightness of the combination of the insulating part 3 and the second shell wall 22 on one hand, improves the insulating property of the button lithium ion battery on the other hand, and improves the surface flatness of the inner cavity of the button lithium ion battery on the other hand, and improves the structural strength of the shell.

As an illustration of the present embodiment, during injection molding, the molten gel further covers the end face of the first casing wall 12 of the first pole casing 1 located at the inner layer, so as to improve the bonding tightness between the insulating member 3 and the first casing wall 12 and improve the air tightness, and on the other hand, the molten gel further protects the casing opening of the first pole casing 1, thereby improving the insulation property and structural stability of the button-type lithium ion battery casing. During injection molding, the surface of the insulating member 3 facing the cavity, which is formed at the end face of the end of the first casing wall 12, can be, but is not limited to, exactly flush with the inner wall of the first casing wall 12, so that the surface of the internal cavity of the button lithium ion battery is in a flat structure, and the structural strength of the casing is maximally improved on the basis of ensuring the space of the internal cavity.

As an illustration of this embodiment, during injection molding, the end face of the second shell wall 22 located at the outer layer is further covered with a molten gel, and this end is protected. When moulding plastics, can also further make the complete cladding of molten colloid at the outer wall of second concha wall 22, make the surface that is located between first top cap 11, the second top cap 21 of knot formula lithium ion battery be insulating part 3 cladding, and insulating part 3 and the periphery of second concha wall 22 combine closely to be connected, for the integration combines connection structure, on the one hand, the insulating properties of knot formula lithium ion battery has been improved greatly, still the periphery of knot formula lithium ion battery provides the protection, improve the intensity of knot formula lithium ion battery's casing, be favorable to the further slim design of casing, be favorable to improving knot formula lithium ion battery's capacity.

As an illustration of the embodiment, the technical solution of the embodiment is applicable to both a cylindrical button cell and other anisotropic solid button lithium ion batteries that are not cylindrical.

When the button lithium ion battery is cylindrical, it can be a cylinder with uniform inner diameter and outer diameter. For example, the first wall 12 has a cylindrical shape with a uniform inner and outer diameters, the second wall 22 has a cylindrical shape with a uniform inner and outer diameters, and the inner diameter of the second wall 22 is slightly larger than the outer diameter of the first wall 12.

As an illustration of the present embodiment, the shape and size of the button lithium ion battery of the present embodiment are not limited, for example, the diameter of the button lithium ion battery may be 5-20 mm, and the thickness thereof may be 1-10 mm.

Example 3:

see fig. 5, 6, and 7 for an example.

As an illustration of the present embodiment, the insulating member of the housing of the present embodiment, which is sleeved between the first pole housing 1 and the second pole housing 21, is an independent insulating sealing ring 5, the insulating sealing ring 5 is sleeved on the first housing wall, and the second housing wall is sleeved outside. After the sleeving connection is completed, the opening section of the second shell wall is mechanically pressed to be narrowed inwards, so that the opening section is bent and tightly pressed outside the insulating sealing ring 5, and the insulating sealing ring 5 is compressed, so that a gap between the first shell wall and the second shell wall is sealed.

Example 4:

see fig. 8-11 for an illustration.

As an illustration of the present embodiment, the housing of the present embodiment includes a first housing 6 and a second top cover 21, wherein the first housing 6 includes a first top cover 11 at one end of the housing and a cylindrical (generally, but not limited to, a straight cylindrical) first housing wall 61 with a certain height surrounding the first top cover 11, and an outer contour of a cross section of the first housing 6 parallel to the first top cover 11 is an ellipse.

The second top cover 21 is hermetically connected to the open end of the first wall 61 of the first housing 6, opposite to the first top cover 11. The second top cover 21 includes a first pole cover 71, a second pole cover 72, and an injection molded insulator 73. The inner periphery of the injection insulator 73 is combined with the outer periphery of the first pole cover 71 in an injection molding mode, the outer periphery of the injection insulator 73 is combined with the outer periphery of the second pole cover 72 in an injection molding mode, the outer periphery of the second top cover 21 is connected with the opening end of the first shell wall 61 in a sealing mode, the first pole cover 71 and the second pole sleeve are isolated in an insulation mode through the injection insulator 73, and the first pole cover 71 and the second pole cover 72 are electrodes on the shell respectively and provide power supply for the outside.

Wherein, the outer periphery of the second top cover 21 and the open end of the first shell wall 61 can be welded by laser, but not limited to, to realize the sealing connection therebetween.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims (11)

1. A button type lithium ion battery is characterized by comprising:

the laminated sheet comprises positive plates and negative plates, a diaphragm is arranged between each positive plate and each negative plate at intervals, electrolyte is soaked in the laminated sheet, and positive lugs and negative lugs of the laminated sheet are respectively connected with electrodes on the shell;

the casing is sealed, the lamination encapsulation is in the casing, the casing includes first top cap, second top cap and is located the tube-shape conch wall between first top cap, the second top cap, first top cap, second top cap are parallel relative, the tube-shape conch wall be on a parallel with the outer profile of the cross section of first top cap, second top cap is oval.

2. The lithium ion button cell according to claim 1,

the housing includes:

a first pole piece including the first top cover and a first shell wall surrounding the first top cover,

a second diode housing including the second top cap and a second housing wall surrounding the second top cap,

the outer contours of the cross sections, parallel to the first top cover and the second top cover, of the first pole shell and the second pole shell are respectively oval;

one of the positive tab and the negative tab of the laminated sheet body is connected with the inner surface of the first top cover, and the other of the positive tab and the negative tab of the laminated sheet body is connected with the inner surface of the second top cover, wherein the first top cover and the second top cover are electrodes on the shell respectively;

the first top cover and the second top cover are parallel, the second shell wall is sleeved with the opening of the first shell wall in a sleeved mode, the second shell wall is sleeved outside the first polar shell, and an insulating piece used for insulating and isolating the first polar shell and the second polar shell is arranged between the first shell wall and the second shell wall.

3. The button lithium ion battery according to claim 2,

the insulating part is formed between the first shell wall and the second shell wall in an injection molding mode and is combined with the first shell wall and the second shell wall on two sides of the insulating part in a sealing mode into a whole.

4. The button lithium ion battery according to claim 3,

the insulating piece covers the inner wall of the second shell wall completely.

5. The button lithium ion battery according to claim 3,

the insulating piece also covers the end face of the first shell wall.

6. The lithium ion button cell according to claim 5,

the inner wall of the insulator is flush with the inner wall of the first housing wall.

7. The button lithium ion battery according to claim 3,

the insulating piece also covers and combines the outer wall of the first shell wall completely.

8. The button lithium ion battery according to claim 7,

the insulating part also covers the end face of the tail end of the second shell wall, completely covers the outer wall of the second shell wall and is combined with the outer wall of the second shell wall.

9. The button lithium ion battery according to claim 2,

the insulating part is an insulating sealing ring sleeved on the first shell wall, the second shell wall is sleeved outside the insulating sealing ring,

the opening section of the second shell wall is bent and tightly pressed outside the insulating sealing ring, and the insulating sealing ring compresses and seals a gap between the first shell wall and the second shell wall.

10. The lithium ion button cell according to claim 1,

the housing includes:

a first housing including the first top cover and a first housing wall surrounding the first top cover, an outer contour of a cross section of the first housing parallel to the first top cover is an ellipse,

the second top cover comprises a first pole cover, a second pole cover and an injection molding insulator, wherein the inner periphery of the injection molding insulator is combined with the outer periphery of the first pole cover in an injection molding mode, the outer periphery of the injection molding insulator is combined with the outer periphery of the second pole cover in an injection molding mode, the outer periphery of the second top cover is connected with the opening end of the first shell wall in a sealing mode, and the first pole cover and the second pole cover are electrodes on the shell respectively.

11. The lithium ion button cell according to claim 1,

the outer contours of the positive plate, the negative plate and each layer of diaphragm in the laminated body are oval.

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