CN210956889U - Button type columnar lithium ion battery - Google Patents

Abstract

The utility model discloses a button type columnar lithium ion battery, which comprises a shell, a roll core, a central upright post, a pole post and a pole ear; a cavity is arranged in the shell; the winding core is arranged in the containing cavity; at least one end of the central upright post is provided with an opening; the pole is arranged on the shell, one end of the pole extends into the opening, and the other end of the pole extends to the outside; the tab is connected with the winding core, extends into the opening and is electrically connected with the pole. The utility model discloses lie in through with utmost point post on the metal covering plate with roll up core electric connection after imbed the center pillar in, make full use of the volume in the center pillar, play the effect that reduces the whole thickness of shell, increase the effective utilization space of battery.

Description

Button type columnar lithium ion battery

Technical Field

The utility model relates to a lithium cell field, in particular to knot formula column lithium ion battery.

Background

With the development and evolution of electronic technology, the demands of electronic devices such as smart phones and new energy vehicles for power supplies and storage batteries are increasing. Among them, batteries such as lithium ion batteries and lithium ion polymer batteries are most widely used, and lithium batteries are used in electronic products, electric tools, electric vehicles, intelligent wearable devices, and even in aviation and military equipment industries.

The button lithium battery is also called a button lithium battery, and is a lithium battery with a small button on the outside, and generally is in a shape of a thin pancake with a larger diameter and a thinner thickness. The button lithium battery is divided from the appearance, and the lithium batteries which correspond to the button lithium battery are classified into a columnar battery, a square battery, a special-shaped battery and the like. The button lithium battery not only can be powered by a single battery, but also can be used by combining a plurality of battery packs into one or more battery packs, and has the advantages of small body shape, high specific capacity, stable voltage, durability and the like.

However, nowadays, people rely on electronic products more and more, and have made higher demands on endurance of the electronic products themselves, and the capacity of the battery becomes a bottleneck limiting development of the electronic products. Adopt traditional laser welding mode, the button column lithium cell of prior art preparation, because the whole thickness of metal lid is on the large side, lead to forming the effective utilization of inner chamber small, the battery capacity is low, and practical commercial value is not high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a knot formula column lithium ion battery, under prior art's with the volume, can improve knot formula lithium ion battery's battery capacity.

According to one aspect of the present invention, a button-type cylindrical lithium ion battery is provided, which comprises a housing, a winding core, a central column, a pole post, and a pole ear; a cavity is arranged in the shell; the winding core is arranged in the containing cavity; at least one end of the central upright post is provided with an opening; the pole is arranged on the shell, one end of the pole extends into the opening, and the other end of the pole extends to the outside; the tab is connected with the winding core, extends into the opening and is electrically connected with the pole.

Preferably, still include last insulating piece and lower insulating piece, go up the insulating piece and attach down the insulating piece respectively in the last bottom surface and the lower bottom surface of roll core.

Preferably, the housing comprises a base and a cover, and the base and the cover cooperate with each other to form the cavity.

Preferably, the pole is disposed on the cover.

Preferably, the lid body is provided with a liquid pouring port and a sealing member capable of closing the liquid pouring port.

Preferably, the seal is a steel ball.

Preferably, the material of the shell is aluminum.

Preferably, the central pillar is cylindrical.

Preferably, the material of the central upright post is plastic.

Preferably, the material of the pole is copper.

Any one of the technical schemes at least has the following beneficial effects:

the utility model discloses lie in through with utmost point post on the metal covering plate with roll up in the core connection back embedding center post, make full use of the volume in the center post, play the effect that reduces the whole thickness of shell, increase the effective utilization space of battery. Compared with the prior art, the battery has higher capacity with the same battery volume.

Drawings

The present invention will be further described with reference to the accompanying drawings and examples;

fig. 1 is a cross-sectional view of an embodiment of the button-type lithium ion battery of the present invention;

figure 2 is the axonometric drawing of the button lithium ion battery embodiment of the utility model.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 and 2, a button type cylindrical lithium ion battery is shown, which comprises a shell 4, a winding core 1, a central upright post 2, a pole 3 and a pole ear 5; a containing cavity is arranged inside the shell 4; the winding core 1 is arranged in the containing cavity; at least one end of the central upright post 2 is provided with an opening; the pole 3 is arranged on the shell 4, one end of the pole 3 extends into the opening, and the other end of the pole 3 extends to the outside; the tab 5 is connected with the winding core 1, and the tab 5 extends into the opening and is electrically connected with the pole 3.

The volume in the central upright post 2 is ingeniously utilized in the embodiment, and the pole 3 on the metal cover plate is connected with the winding core 1 and then embedded into the central upright post 2. The top of lid 42 has not had the restriction of utmost point post 3, can arrange more closely with rolling up core 1, and relative reduction lid 42 whole thickness increases the effective utilization space of battery. Compared with the prior art, the battery has higher capacity with the same battery volume.

Referring to fig. 2, in an embodiment, an upper insulation sheet 6 and a lower insulation sheet 7 are further included, and the upper insulation sheet 6 and the lower insulation sheet 7 are respectively attached to the upper bottom surface and the lower bottom surface of the winding core 1. The insulating piece can keep apart roll core 1 and lid 42 effectively, avoids roll core 1 to lead to inside unexpected short circuit because of external physics factor, has increased the stability of rolling core 1.

In one embodiment, the housing 4 includes a base 41 and a cover 42, and the base 41 and the cover 42 cooperate to form a cavity. The separate base 41 and cover 42 make the internal core 1 easier to package.

Referring to fig. 1, in one embodiment, the post 3 is disposed on the cover 42. Utmost point post 3 is fixed mounting in advance on lid 42, makes things convenient for in the production process to say utmost point post 3 and lid 42 insulation treatment, improves the off-the-shelf quality of this embodiment.

Referring to fig. 1, in one embodiment, the lid 42 is provided with a pouring outlet 422 and a seal 421, and the seal 421 can close the pouring outlet 422. The electrolyte is injected into the winding core 1 through the injection port 422. After the electrolyte is injected, the injection port 422 is sealed by using the sealing member 421, so as to form the button-type cylindrical lithium ion battery. The mode of injecting electrolyte of adopting little through-hole for electrolyte injection is more abundant, can effectively avoid the inside bubble that appears of lithium cell, improves the yield of this example. The steel ball used in this embodiment closes the pouring port 422. It is contemplated that in practical applications, an aluminum ball may be used instead of the sealing member 421, or a sealant may be used directly for sealing, but is not limited thereto.

In one embodiment, the material of the cover 42 is aluminum, and may also be stainless steel, but is not limited thereto. The aluminum material has low resistivity and low density, which results in good electrical conductivity and less weight of the electrode of this example.

In one embodiment, the material of the post 3 is copper. Although the pole 3 of the embodiment is slender, copper with good conductivity is selected as the pole 3, so that the pole 3 has excellent conductivity, and the internal resistance of the embodiment is greatly reduced. Of course, the material of the pole 3 may be other metals, such as stainless steel, but is not limited thereto.

In one embodiment, the central post 2 is cylindrical. Cylindric center pillar 2 has reduced the preparation degree of difficulty of rolling up core 1, also reduces the difference of each position of this embodiment simultaneously, increases the stability of this embodiment. Of course, the center pillar 2 may have another shape, for example, a rectangular parallelepiped shape, but is not limited thereto.

In one embodiment, the material of the central pillar 2 is plastic. Plastics have corrosion-resistant, insulating, ageing-resistant advantage for this embodiment is inside to have higher stability. Of course, the central pillar 2 may be made of other insulating materials, such as rubber, but not limited thereto.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge range of those skilled in the art.

Claims (10)

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

a housing (4) with a cavity therein;

a winding core (1) arranged in the containing cavity;

a central upright column (2) at least one end of which is provided with an opening;

the pole post (3) is arranged on the shell (4), one end of the pole post (3) extends into the opening, and the other end of the pole post (3) extends to the outside;

utmost point ear (5), with roll up core (1) and connect, utmost point ear (5) extend to in the opening and with utmost point post (3) electric connection.

2. The button type cylindrical lithium ion battery according to claim 1, further comprising an upper insulation sheet (6) and a lower insulation sheet (7), wherein the upper insulation sheet (6) and the lower insulation sheet (7) are respectively attached to the upper bottom surface and the lower bottom surface of the coil core (1).

3. The button type columnar lithium ion battery according to claim 1, wherein the shell (4) comprises a base (41) and a cover (42), and the base (41) and the cover (42) are mutually matched to form the cavity.

4. The button type cylindrical lithium ion battery according to claim 3, wherein the terminal post (3) is disposed on the cover body (42).

5. The button type columnar lithium ion battery according to claim 3, wherein the cover body (42) is provided with a liquid injection port (422) and a sealing member (421), and the sealing member (421) can close the liquid injection port (422).

6. The lithium ion battery of claim 5, wherein the sealing member (421) is a steel ball.

7. The button type columnar lithium ion battery according to claim 1, wherein the material of the shell (4) is aluminum.

8. The button type columnar lithium ion battery according to claim 1, wherein the central pillar (2) is cylindrical.

9. The button type columnar lithium ion battery as claimed in claim 1, wherein the material of the central pillar (2) is plastic.

10. The button type columnar lithium ion battery according to claim 1, wherein the material of the pole (3) is copper.

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