CN213026277U

CN213026277U - Miniature lithium ion battery

Info

Publication number: CN213026277U
Application number: CN202021323022.9U
Authority: CN
Inventors: 梅承寨
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-11
Filing date: 2020-07-06
Publication date: 2021-04-20
Anticipated expiration: 2030-07-06
Also published as: CN213026284U; CN213340528U

Abstract

The utility model relates to a miniature lithium ion battery, which comprises a battery cavity, wherein the battery cavity comprises a cavity wall and an internal cavity; the inner cavity is used for accommodating a battery winding body and storing electrolyte, and the center of the battery winding body is a winding core cavity; the wall of the battery cavity is provided with an opening penetrating through the wall of the battery cavity, the wall of the opening convexly extends from the inner wall of the battery cavity to form a section of convex wall, and the convex wall extends towards the position corresponding to the core cavity in the battery cavity; the miniature lithium ion battery also comprises an insulating sealing ring and a metal conductor, wherein the insulating sealing ring is embedded into the open hole and is in tight fit with the wall of the open hole to seal the open hole; a through hole is formed in the insulating sealing ring, and the metal conductor is installed in the through hole of the insulating sealing ring. The utility model discloses a miniature lithium ion battery makes the battery cavity inner volume maximize, can have better sealing performance again.

Description

Miniature lithium ion battery

Technical Field

The utility model belongs to the technical field of the technique of battery structure and specifically relates to a miniature lithium ion battery.

Background

Nowadays, small electronic products are applied more and more, such as wearing products, earphones and the like, the products are small in size, and the battery capacity is required to be higher. The button battery in the prior art is generally a double-layer cylindrical battery cavity, the bottom shell serves as an inner-layer cylindrical battery cavity, the cover plate serves as an outer-layer cylindrical battery cavity, the two layers of cylindrical battery cavities are reversely embedded to form the double-layer cylindrical battery cavity, and the sealing ring is arranged between the double-layer cylindrical battery cavities, so that the radial overall thickness is large (including the thickness of the inner layer, the thickness of the outer-layer cylindrical battery cavity and the thickness of the sealing ring), and the battery capacity is low. The button cell is limited in the external dimension, and the capacity of the button cell is difficult to improve. In addition, the battery shell cover is made of thin materials, so that sealing is difficult, and the problems of sealing and capacity improvement are difficult to achieve simultaneously.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: the utility model provides a miniature lithium ion battery, solves current miniature lithium ion battery capacity and is little, is difficult to improve the capacity and battery chamber seal difficulty scheduling problem.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a miniature lithium ion battery comprises a battery cavity; the battery cavity comprises a cavity wall and an internal cavity; the inner cavity is used for accommodating a battery winding body and storing electrolyte, and the center of the battery winding body is a winding core cavity; the wall of the battery cavity is provided with an opening penetrating through the wall of the battery cavity, the wall of the opening convexly extends from the inner wall of the battery cavity to form a section of convex wall, and the convex wall extends towards the position corresponding to the core cavity in the battery cavity; the miniature lithium ion battery also comprises an insulating sealing ring and a metal conductor, wherein the insulating sealing ring is embedded into the open hole and is in tight fit with the wall of the open hole to seal the open hole; a through hole is formed in the insulating sealing ring, and the metal conductor is installed in the through hole of the insulating sealing ring.

Further, the battery cavity and the metal conductor are respectively used as two electrodes of the battery; the insulating sealing ring isolates and insulates the two electrodes; the insulating sealing ring is embedded into the open hole and is in tight fit with the hole wall to seal the open hole; the battery cavity is an open container, and the opening of the battery cavity is sealed and covered by a cover plate; a coil core cavity of the battery winding body is correspondingly formed by a fabrication hole for manufacturing a coil needle of the battery winding body; the convex wall with the opening, the insulating sealing ring and the metal conductor inserted into the insulating sealing ring are accommodated in a winding core cavity of the battery winding body after being assembled; the opening is aligned with a winding core cavity of the battery winding body in the battery cavity and communicated with the winding core cavity; the opening serves as an injection hole for the electrolyte.

Further, the metal conductor is electrically connected with the pole piece in the battery cavity; the opening is formed in the bottom wall of the battery cavity; the opening is a central opening of the bottom wall of the battery cavity.

Further, the convex wall and the inner wall of the battery cavity are of an integral structure; the convex wall is a section of extended hole wall vertical to the inner wall of the battery cavity.

In some embodiments, the protruding wall is welded with the inner wall of the battery cavity as an integral structure, or is an integral structure formed by bending the cavity wall of the battery cavity inwards at the opening.

Further, the insulating sealing ring is matched with the length of the hole wall of the opening; the insulating seal ring is a seal rubber ring.

Furthermore, one end of the insulating sealing ring in the battery cavity forms a flange which is tightly propped against the tail end of the convex wall.

Furthermore, the other end of the insulating sealing ring extends out of the outer wall of the battery cavity by a preset height from the opening.

Further, the metal conductor is a rivet; the cover plate is welded on the open edge of the battery cavity.

As some embodiments, the micro lithium ion battery is a square lithium ion battery or a cylindrical lithium ion battery; the battery cavity is of a single-shell structure.

The utility model has the advantages that:

the utility model discloses a miniature lithium ion battery, to the chamber wall trompil in battery chamber, the inner wall forms one section bellied protruding wall, can let the area of contact increase in sealed rubber ring and hole, and the ingenious part of this design lies in protruding to the battery chamber, and stretches into the cavity of rolling up the core, just utilizes the pole piece to roll up the process hole that core cavity book needle work, and the make full use of space does not occupy extra space, and the battery chamber volume maximize can also reach better sealed effect.

The present invention will be described in further detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a perspective view of a lithium ion micro battery according to a first embodiment of the present invention.

Fig. 2 is a cross-sectional view of a first embodiment of the present invention.

Fig. 3 is an exploded view of a first embodiment of the lithium ion miniature battery of the present invention.

Fig. 4 is a perspective view of a lithium ion micro battery according to a second embodiment of the present invention.

Fig. 5 is a cross-sectional view of a lithium ion micro battery according to a second embodiment of the present invention.

Fig. 6 is an exploded view of a lithium ion micro battery according to a second embodiment of the present invention.

Detailed Description

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1-6, an embodiment of the present invention relates to a micro lithium ion battery 100, which includes a battery cavity 1, a cover plate 2, an insulating sealing ring 3, and a metal conductor 4. The battery cavity 1 is covered and sealed by a cover plate 2. The battery chamber 1 is provided with a battery winding body 5 and contains electrolyte. In some embodiments, the micro lithium ion battery may be a square lithium ion battery or a cylindrical lithium ion battery, etc. An opening 6 is formed in the cavity wall or the cover plate 2 of the battery cavity 1, the insulating sealing ring 3 is plugged into the opening 6 to seal the opening 6, and the metal conductor 4 is installed in the opening 6. The battery cavity 1 and the cover plate 2 are used as one electrode of the battery; the metal conductor 4 is used as the other electrode of the battery and is electrically connected with the pole piece material in the battery cavity.

The battery cavity 1 is an open container and comprises a cavity wall and an internal cavity. The chamber wall is typically a single shell structure with an open top 13 provided at the top (or other suitable location of the chamber wall). The inner cavity is used for accommodating the battery winding body 5 and the electrolyte, and the principle that the volume is designed to be maximized to accommodate more battery winding bodies 5 is taken as a principle. The shape of the battery cavity 1 is designed according to the overall shape of the battery, and can be cylindrical or square, for example, and the battery cavity is made of metal. It will be appreciated that the opening 13 may be provided at any suitable position on the wall of the battery chamber 1, typically at the top of a cylindrical battery or a prismatic battery.

The cover plate 2 is used for covering the opening 13 of the battery cavity 1 and can be welded on the opening 13 of the battery cavity 1, specifically, the peripheral edge of the cover plate 2 is welded with the opening edge of the battery cavity for sealing and fixing, and the cover plate 2 covers the opening 13 of the battery cavity 1, so that the battery winding body 5 and electrolyte are sealed in the battery cavity 1. The cover plate 2 is adapted to the open shape of the battery chamber 1, and may be, for example, circular or square or other suitable shape. In this embodiment, the cover plate 2 is a metal flat plate, but may be an outward arch or the like. The opening 13 can be used for mounting the jelly roll 5 or the like in the battery chamber.

In this embodiment, the metal conductor 4 is a rivet.

Referring to fig. 1-3, the first embodiment of the present invention of a miniature lithium ion battery 100, the top of the battery cavity 1 is open 13, the cover plate 2 is welded to the opening of the top of the battery cavity 1, specifically, the peripheral edge of the cover plate 2 is welded to the opening of the top of the battery cavity for sealing and fixing. The cover plate 2 is provided with an opening 6 for installing an insulating seal ring 3 and a rivet 4, the insulating seal ring 3 is inserted into the opening 6 and tightly matched with the hole wall of the opening 6 to seal the battery cover plate and the fixing rivet 4 and enable the positive electrode and the negative electrode to be isolated and insulated. Preferably, the opening 6 is a central opening of the cover plate 2.

On the inner side surface of the cover plate 2, the hole wall of the opening 6 convexly extends towards the inside of the battery cavity 1 to form a section of extending convex wall 60, so as to enlarge the contact surface between the hole wall of the opening 6 and the insulating sealing ring 3, thereby increasing the sealing effect and the installation acting force. The opening 6 is used for installing the insulating sealing ring 3 and the metal conductor 4. When the cover plate 2 is closed on the top opening of the battery cavity 1, the convex wall 60 on the inner side surface of the cover plate extends into the battery cavity 1. Preferably, the protruding wall 60, as an extended hole wall of the opening 6, integrally protrudes and extends a certain height from the inner side surface of the cover plate; it can be a convex structure welded on the inner side surface of the cover plate, or an integral convex knot body bent inwards from the cover body at the opening 6. In this embodiment, the convex wall 60 is a circular tube extending perpendicular to the back surface (inner surface) of the cover plate 2, and extends toward the battery cavity 1 and into the winding core cavity 50 at the center of the battery winding body 5 mounted in the battery cavity. The opening 6 penetrates through the center inside of the convex wall 60 and the thickness of the battery cover plate 2. Trompil 6 sets up on apron 2 and aligns and link up each other with the book core cavity 50 of battery chamber battery winding body 5, corresponds with the fabrication hole of the book needle work of preparation winding body 5, and accessible trompil 6 injects the electrolyte into battery chamber 1, can utilize again to roll up the extension pore wall that core cavity 50 held trompil 6 to make full use of battery chamber's volume.

The insulating sealing ring 3 is matched with the opening 6 and is inserted into the opening 6 to be in tight fit with the hole wall. The insulating sealing ring 3 is generally a sealing rubber ring, preferably made of an elastomer, and has an overall annular structure. As an embodiment, the shape-restored insulating seal ring 3 has a hollow T-shape or I-shape in cross section. One end of the insulating seal ring 3 is flanged for abutting against the end edge of the opening convex wall 60. The insulating seal ring 3 is used for mounting the other electrode of the battery, insulating the positive and negative electrodes of the battery, and sealing the opening 6. The height of the insulating sealing ring 3 corresponds to the length of the hole wall of the opening 6 (or the length of the convex wall 60), and in the embodiment, the height of the insulating sealing ring 3 is greater than the length of the hole wall of the opening 6. The insulating sealing ring 3 is sleeved in the opening 6 of the cover plate, one end of the insulating sealing ring is tightly abutted with the tail end of the convex wall 60 (a pipe body in the embodiment) of the opening 6, and the other end of the insulating sealing ring can extend out of the outer surface (or the top surface) of the cover plate from the opening 6 by a certain height. The insulating seal ring 3 has a through hole (or a center through hole) 30 formed at the center thereof, and is inserted through the insulating seal ring 3 in the longitudinal direction thereof, to which the metal conductor 4 is attached.

The metal conductor 4 can be used as a battery anode and is nailed into the through hole 30 of the insulating seal ring 3 and tightly matched, so that the through hole 30 at the center of the insulating seal ring 3 is sealed. The metal conductor 4 is a rivet, the head of which is tightly pressed against the other end (top end) of the insulating seal ring 3 and is positioned on the top surface of the cover plate, and can be arranged to slightly protrude upwards, for example, by about 0.1mm from the top surface of the cover plate. The insulating seal ring 3 insulates the rivet 4 from the battery cover plate 1 to avoid short circuit. For example, the top area of the insulating seal 3 is larger than the head of the rivet so that the head edge of the rivet does not extend beyond the top of the insulating seal 3 and does not contact the battery cover plate 2. Or after the insulating sealing ring 3 is arranged in the opening 6, the top end of the insulating sealing ring protrudes out of the top surface of the cover plate by a certain height, and the head of the rivet driven into the insulating sealing ring 3 is lifted to be away from the battery cover plate.

The battery cavity 1 is internally provided with a battery winding body 5, and a winding core cavity 50 of the winding body 5 is correspondingly formed by a fabrication hole for manufacturing a winding needle of the winding body 5. The convex wall 60 with the hole at the center of the cover plate 2, the insulating seal ring 3 and the metal conductor 4 nailed into the insulating seal ring 3 extend into the battery cavity after being assembled and are contained in the winding core cavity 50 of the winding body 5, so that the additional space of the battery cavity is not occupied, and the installation and the quantity of the winding body 5 are not influenced.

In this embodiment, the battery cover plate is welded to the opening at the top of the battery cavity, and does not occupy the battery capacity, so that the volume in the battery cavity is maximized. Through at battery apron center trompil and towards the protruding wall formation extension pore wall that sets up in the battery chamber, insulating seal circle 3 inserts the trompil inside and sealed, makes the area of contact increase of sealing washer 3 and trompil, and the ingenious point of this design lies in extending the pore wall and inwards protruding and hold in the process hole of pole piece roll core cavity book needle work, does not occupy the inside effective volume of battery to reached and made the battery intracavity volume maximize, also obtained better sealed effect.

Referring to fig. 4-6, in a second embodiment of the present invention, the battery chamber 1 is an open container, which includes a chamber wall of the battery chamber and an internal cavity, and the chamber wall is generally a single-shell structure. The opening 13 is generally disposed at the top of the battery cavity, the arrangement of the opening 13 facilitates the installation of the battery roll 5 inside the battery cavity, and the inner cavity is designed to maximize the volume to accommodate more battery rolls 5. The cover plate 2 is used for covering an opening 13 on the battery cavity and can be welded on the opening at the top of the battery cavity 1. Specifically, the peripheral edge of the cover plate 2 is welded and sealed with the open edge of the top of the battery cavity, the cover plate 2 covers the battery cavity 1, and the battery winding body 5 and the electrolyte are sealed in the battery cavity 1. The cover plate 2 is adapted to the opening at the top of the battery cavity 1, and covers the opening at the top of the battery cavity, and may be circular or square or other suitable shapes. In this embodiment, the cover plate 2 is a one-piece metal plate, but may be outwardly arched.

In a second embodiment of the present invention, the opening 6 is disposed on the wall of the battery cavity. Trompil 6 aligns and link up each other with the book core cavity 50 of battery winding body 5 in the battery chamber, corresponds with the fabrication hole of the book needle work of preparation winding body 5, and accessible trompil 6 injects the electrolyte into battery chamber 1, can utilize again to roll up the extension pore wall that core cavity 50 held trompil 6 to make full use of battery chamber's volume. The opening 6 is provided with an insulating seal ring 3 and a metal conductor 4. The insulating sealing ring 3 is inserted into the opening 6 and is in tight fit with the hole wall of the opening 6, and is used for sealing the opening 6, fixing the metal conductor 4 and insulating the positive electrode and the negative electrode of the battery.

The opening 6 is a through hole arranged on the cavity wall of the battery cavity and is opposite to the winding core cavity 50 at the center of the battery winding body 5 in the battery cavity 1. The jelly roll cavity 50 is the void in the center of the wound body of the battery, and is generally defined by the innermost layer, i.e., the jelly roll, which is inevitably present. As a specific example, the winding core cavity 50 is located at the central axis of the battery cavity 1, and accordingly, the opening 6 is the central opening of the bottom wall 12 of the battery cavity 1. Of course, according to the different settings of the battery winding body 5, the roll core cavity 50 may be located at different positions inside the battery cavity 1, and correspondingly, the opening 6 is arranged at a position corresponding to the roll core cavity 50 on the cavity wall of the battery cavity and is communicated with each other, so as to facilitate the injection of electrolyte into the battery cavity 1 through the opening 6, and the convex wall 60 of the opening 6 can be accommodated in the roll core cavity 50, so as to fully utilize the volume of the battery cavity.

A through hole is formed in the wall of the battery cavity, for example, the center of the bottom wall 12, that is, the through hole 6 is formed, and the wall of the through hole 6 convexly extends from the inner wall of the battery cavity towards the inside of the battery cavity 1 to form a section of convex wall 60, so that the contact surface between the wall of the through hole 6 and the insulating sealing ring 3 is enlarged, the sealing effect is increased, and the installation acting force is increased. The opening 6 is used for installing the insulating sealing ring 3 and the metal conductor 4. The protruding wall 60 protrudes into the battery chamber 1. Preferably, the convex wall 60 of the opening 6 integrally protrudes from the inner wall of the battery cavity (toward the inside of the battery cavity 1) to a certain height and extends into the winding core cavity 50. The convex wall 60 may be an integral convex wall structure welded to the inner wall of the battery chamber, or an integral structure bent inward from the wall of the battery chamber at the opening. In this embodiment, the convex wall 60 is a section of extending hole wall perpendicular to the inner wall of the battery cavity, extends toward the inside of the battery cavity 1, and extends into the winding core cavity 50 at the center of the battery winding body 5 installed in the battery cavity. The opening 6 penetrates the center of the convex wall 60.

The insulating seal ring 3 is the same as or similar to that in the first embodiment, and is not described in detail.

The metal conductor 4 is used as a battery anode, and the metal conductor 4 is nailed into the through hole 30 of the insulating seal ring 3 and is in tight fit, so that the through hole 30 in the center of the insulating seal ring 3 is sealed. In this embodiment, the metal conductor 4 is a rivet, the head of which abuts against the end of the insulating seal ring 3, and may be slightly protruded outward, for example, by about 0.1mm from the bottom surface of the battery cavity. Of course, the metal conductor 4 may be immersed in the insulating seal 3. The insulating sealing ring 3 insulates and separates the metal conductor 4 from the wall of the battery cavity (in the specific example, the bottom wall 12 of the battery cavity) to avoid short circuit. For example, the diameter of the insulating seal ring 3 is larger than the diameter of the metal conductor and larger than the diameter of the head of the metal conductor, and after the metal conductor is inserted into the central through hole, the edge of the head of the metal conductor 4 does not exceed the end part of the insulating seal ring 3 and does not contact the cavity wall of the battery cavity. Or after the insulating sealing ring 3 is installed in the opening 6 of the cavity wall of the battery cavity, the end part of the insulating sealing ring protrudes out of the outer wall of the bottom surface of the battery cavity by a certain height, and the head of the metal conductor 4 nailed in the insulating sealing ring 3, such as a rivet, is lifted to be away from the bottom surface of the battery cavity.

The battery cavity 1 in the battery is internally provided with a battery winding body 5, and a winding core cavity 50 of the winding body 5 is correspondingly formed by a fabrication hole for manufacturing a winding needle of the winding body 5. The convex wall (i.e. the extending hole wall) 60 of the opening 6 of the cavity wall (such as the center of the bottom wall) of the battery cavity, the insulating seal ring 3 and the metal conductor 4 nailed into the insulating seal ring 3 extend into the battery cavity after assembly and are contained in the winding core cavity 50 of the winding body 5, so that the extra space in the battery cavity is not occupied, and the installation and the quantity of the winding body 5 are not influenced. The opening 61 serves as an injection hole.

The metal conductor 4 is electrically connected to the battery winder pole piece inside the battery cavity.

In the miniature lithium ion battery of the embodiment, the battery cover plate is welded on the opening of the battery cavity, and the combination between the cover plate and the battery cavity does not occupy the battery capacity, so that the volume in the battery cavity is maximized. Through the extension pore wall (protruding wall) that sets up towards the battery chamber in the chamber wall trompil in battery chamber, insulating seal circle 3 inserts the trompil inside and the sealed battery chamber, make the area of contact increase of sealing washer 3 and trompil, the ingenious part of this design lies in the extension pore wall of trompil 6 protruding towards the battery chamber is inside, stretch into the book core cavity 50 of winding body 5, just utilize the process hole that the needle work was rolled up to pole piece book core cavity, do not occupy the inside effective volume of battery, thereby reached and made the battery chamber internal volume maximize, and reach better sealed effect.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and are intended to be within the scope of the application; the scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A miniature lithium ion battery comprises a battery cavity; the battery cavity comprises a cavity wall and an internal cavity; the inner cavity is used for accommodating a battery winding body and storing electrolyte, and the center of the battery winding body is a winding core cavity; the method is characterized in that:

the wall of the battery cavity is provided with an opening penetrating through the wall of the battery cavity, the wall of the opening convexly extends from the inner wall of the battery cavity to form a section of convex wall, and the convex wall extends towards the position corresponding to the core cavity in the battery cavity;

the miniature lithium ion battery also comprises an insulating sealing ring and a metal conductor, wherein the insulating sealing ring is embedded into the open hole and is in tight fit with the wall of the open hole to seal the open hole; a through hole is formed in the insulating sealing ring, and the metal conductor is installed in the through hole of the insulating sealing ring.

2. The miniature lithium ion battery of claim 1, wherein:

the battery cavity and the metal conductor are respectively used as two electrodes of the battery; the insulating sealing ring isolates and insulates the two electrodes;

the metal conductor is inserted into the through hole of the insulating sealing ring to be tensioned and hermetically matched;

the battery cavity is an open container, and the opening of the battery cavity is sealed and covered by a cover plate;

a coil core cavity of the battery winding body is correspondingly formed by a fabrication hole for manufacturing a coil needle of the battery winding body; the convex wall with the opening, the insulating sealing ring and the metal conductor inserted into the insulating sealing ring are accommodated in a winding core cavity of the battery winding body after being assembled;

the opening is aligned with a winding core cavity of the battery winding body in the battery cavity and communicated with the winding core cavity;

the opening serves as an injection hole for the electrolyte.

3. The miniature lithium ion battery of claim 1, wherein:

the metal conductor is electrically connected with the pole piece material in the battery cavity;

the opening is formed in the bottom wall of the battery cavity;

the opening is a central opening of the bottom wall of the battery cavity.

4. The miniature lithium ion battery of claim 1, wherein: the convex wall and the inner wall of the battery cavity are of an integral structure; the convex wall is a section of extended hole wall vertical to the inner wall of the battery cavity.

5. The miniature lithium ion battery of claim 4, wherein: the convex wall and the inner wall of the battery cavity are welded into an integral structure, or the integral structure is formed by bending the cavity wall of the battery cavity inwards at the opening.

6. The miniature lithium ion battery of claim 1, wherein: the insulating sealing ring is matched with the length of the hole wall of the opening; the insulating seal ring is a seal rubber ring.

7. The miniature lithium ion battery of claim 6, wherein: one end of the insulating sealing ring, which is positioned in the battery cavity, forms a flange which is tightly propped against the tail end of the convex wall.

8. The miniature lithium ion battery of claim 6, wherein: the other end of the insulating seal ring extends out of the outer wall of the battery cavity by a preset height from the opening.

9. The miniature lithium ion battery of claim 2, wherein:

the metal conductor is a rivet; the cover plate is welded on the open edge of the battery cavity.

10. The micro lithium ion battery according to any one of claims 1 to 9, wherein: the miniature lithium ion battery is a square lithium ion battery or a cylindrical lithium ion battery; the battery cavity is of a single-shell structure.