CN219873644U

CN219873644U - Miniature chargeable and dischargeable cell of flat thin dress

Info

Publication number: CN219873644U
Application number: CN202320249998.3U
Authority: CN
Inventors: 叶敏华; 叶嘉慧
Original assignee: Chung Pak Guangdong Battery Industrial Co ltd; CHUNG PAK INVESTMENT Ltd
Current assignee: Chung Pak Guangdong Battery Industrial Co ltd; CHUNG PAK INVESTMENT Ltd
Priority date: 2022-11-14
Filing date: 2023-02-17
Publication date: 2023-10-20
Anticipated expiration: 2033-02-17

Abstract

The utility model provides a miniature chargeable and dischargeable cell with flat and thin package, which comprises a shell, a winding cell accommodated in the shell and a cover plate assembled on the shell in a sealing way; wherein the shell is a steel shell, the cover plate is a steel cover plate, and the cover plate is welded on the shell; the shell is provided with a side wall, a through hole is formed in the side wall, and a positive pole arranged in the through hole is sleeved with a rubber column which is in insulating fit with the through hole; the positive pole post is electrically connected with the positive pole end of the winding electric core through the positive pole guide piece, and the negative pole end of the winding electric core is electrically connected with the side wall through the negative pole guide piece. The shell is made of steel, and the cover plate is made of steel, so that the whole battery has higher toughness, and can have higher capacity and energy density under the same volume.

Description

Miniature chargeable and dischargeable cell of flat thin dress

Technical Field

The utility model relates to a miniature rechargeable battery which is flat and thin.

Background

The existing thin-packed miniature rechargeable battery mainly takes a lithium ion battery as an internal electrode of the battery, and the outside of the battery is coated with an aluminum composite film or an aluminum shell seal-formed battery. The aluminum composite membrane can be very thin, but has three sides outside which need to be sealed, occupies the volume space of the battery, and reduces the capacity of the battery; in addition, the aluminum composite film is soft and is easy to puncture and puncture, and can not be used on certain electric appliances needing rigid strength. The aluminum shell needs to be formed by adopting a thicker aluminum sheet shell to support the aluminum shell, so that the volume of the internal space of the battery is occupied, the internal positive and negative electrode active substances of the battery are relatively reduced, and the corresponding capacity is also reduced. Therefore, there is an urgent need to develop a miniature lithium ion rechargeable battery with a tough casing and high capacity to meet the market demand.

Disclosure of Invention

The main object of the present utility model is to provide a flat and thin rechargeable battery with high strength and high battery capacity.

In order to achieve the above purpose, the utility model provides a miniature chargeable and dischargeable cell which is flat and thin, comprising a shell, a winding cell accommodated in the shell and a cover plate which is hermetically assembled on the shell, wherein the shell is a steel shell, the cover plate is a steel cover plate, and the cover plate is welded on the shell; the shell is provided with a side wall, a through hole is formed in the side wall, and a positive pole arranged in the through hole is sleeved with a rubber column which is in insulating fit with the through hole; the positive pole post is electrically connected with the positive pole end of the winding electric core through the positive pole guide piece, and the negative pole end of the winding electric core is electrically connected with the side wall through the negative pole guide piece.

According to one embodiment of the utility model, the projected shape of the housing is circular, positive, rectangular, diamond, star or regular polygon.

According to one embodiment of the utility model, the wound cells are wrapped with a piece of gummed paper for forming an insulating fit with the casing.

According to one embodiment of the utility model, the thickness of the housing is 0.05mm-0.10mm.

According to one embodiment of the utility model, the cover plate is provided with at least one explosion-proof pattern.

Further, the explosion-proof pattern is at least one of a straight shape, a cross shape, an arc shape, an X shape or a Y shape.

Further, the depth of the explosion-proof pattern is 1/3-1/2 of the thickness of the cover plate.

According to one specific embodiment of the utility model, the side wall is provided with a filling hole for filling electrolyte and a steel cap for blocking the filling hole, and the steel cap is in welding fit with the side wall.

According to one embodiment of the utility model, the glue column is provided with a glue layer.

According to one embodiment of the utility model, the positive pole is T-shaped and has an extending portion and a limiting portion connected to each other, both of which are cylindrical, wherein the extending portion is disposed to pass through the through hole and is partially located at the inner side of the case, and the limiting portion is located at the outer side of the case.

The utility model has the following beneficial effects:

in the utility model, the steel shell is adopted as the shell and the steel cover plate is adopted as the cover plate, so that the whole battery has higher toughness, and can have higher capacity and energy density under the same volume.

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

Drawings

Fig. 1 is a battery configuration diagram of embodiment 1 of the present utility model;

FIG. 2 is a block diagram of a housing when made in accordance with embodiment 1 of the present utility model;

FIG. 3 is a structural view of a winding cell in embodiment 1 of the present utility model;

FIG. 4 is a structural view of a cover plate in embodiment 1 of the present utility model;

FIG. 5 is a block diagram of a glue string in embodiment 1 of the utility model;

fig. 6 is a structural view of the positive electrode post in embodiment 1 of the present utility model;

fig. 7 is a structural view of a positive electrode guide sheet in embodiment 1 of the present utility model;

fig. 8 is a structural view of a steel cap in embodiment 1 of the present utility model.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and the scope of the utility model is therefore not limited to the specific embodiments disclosed below.

Example 1

As shown in fig. 1, embodiment 1 provides a flat and thin-packed miniature rechargeable battery, which comprises a housing 10, a winding cell 20 accommodated in the housing 10, and a cover plate 30 assembled on the housing 10 in a sealing manner.

The housing 10 is a steel housing, and the horizontal projection shape of the housing 10 is a circle, a positive direction, a rectangle, a diamond, a star or a regular polygon. Preferably, the housing 10 is square in configuration. Specifically, the case 10 is made of an extremely thin stainless steel material, such as SUS304, SUS310, SUS316L, preferably SUS316L, and the thickness of the case 10 is 0.05 to 0.10mm, preferably 0.075mm, so that the volume of the inner cavity of the battery is greatly increased, and the positive and negative electrode active materials in the battery can be improved.

As shown in fig. 2, the housing 10 is formed in a pre-formed shape during manufacturing, the housing 10 is formed by punching a die, a housing cavity 11 is formed in the housing 10, the height of the housing cavity 11 varies according to different models, and the thickness of the housing cavity 11 is between 0.5mm and 5.0mm in a conventional manner.

The top opening of the press-formed housing 10 has a flange portion 12 and a corner portion 13, which are intended to be engaged with the cover plate 30. Specifically, as shown in fig. 4, the cover plate 30 is formed by press forming the cover plate 30 by a die, and the cover plate 30 is adapted to the flange 12 and the corner 13 of the housing 10 and is sealed by welding. After the manufacture is completed, redundant matching parts are cut off through trimming treatment.

Specifically, the welding mode is laser welding.

As shown in fig. 3, the outer circumference of the winding cell 20 is wrapped with a piece of gummed paper for forming an insulating fit with the case 10, preventing contact with the inner wall of the case 10 to cause a short circuit; specifically, the wound cells 20 are mechanically flattened to be fully placed into the receiving cavity 11 of the housing 10. The winding cell 20 has a positive terminal 21 and a negative terminal 22 for connection.

With continued reference to fig. 2, the housing 10 has side walls, wherein one of the side walls 10a is provided with a through hole 14, and the through hole 14 is used for passing through the positive electrode post 40 and carrying the positive electrode post 40; in order to realize insulation between the positive electrode post 40 and the side wall 10a, a glue post 50 with a perforation 14 in insulation fit is sleeved on the positive electrode post 40.

As shown in fig. 5, the glue post 50 is T-shaped to form a complete insulation between the through hole 14 and the positive electrode post 40; wherein the glue column 50 has a through hole 51 for the positive electrode column 40 to pass through. Specifically, the glue string 50 has an outer ring portion 52 and an inner ring portion 53, the inner ring portion 53 is configured to form a fit with the through hole 14, and the outer ring portion 52 is configured to abut against an outer side surface of the sidewall 10a to form a stable support.

Preferably, the glue column 50 is injection molded by PP, PEEK, PTEF, PPS and other materials,

as shown in fig. 6, the positive electrode post 40 has a T-shape having an extending portion 41 and a limiting portion 42 connected to each other, the extending portion 41 and the limiting portion 42 each having a columnar shape, wherein the extending portion 41 is disposed to pass through the through hole 51 and partially locate inside the case 10, and the limiting portion 42 is located outside the case 10.

Wherein the length of the positive electrode post 40 is greater than the length of the glue post 50, preferably, the difference between the length of the positive electrode post 40 and the length of the glue post 50 is 0.5mm-1.5mm, specifically, for example, 1mm, so that the protruding portion 41 protrudes from the through hole 51.

Specifically, the positive electrode post 40 is made of SUS stainless steel wire, for example, SUS304, SUS310, SUS316, and SUS316L, and the positive electrode post 40 is preferably made of SUS316L by mechanical means.

The positive terminal 21 of the winding cell 20 is electrically connected to the positive post 40 through the positive guide piece 60, and the negative terminal 22 of the winding cell 20 is electrically connected to the sidewall 10a through the negative guide piece (not shown).

A preferred structure of the positive electrode guide sheet 60 is shown in fig. 7, which is made of a steel material such as SUS304, SUS310, SUS316L, preferably SUS316L; wherein the thickness of the positive electrode guide sheet 60 is 0.10 to 0.30mm, preferably 0.20mm; the positive electrode guide piece 60 is provided with a connecting hole 61, and a hole shaft (preferably, a tight fit) is formed between the extending portion 41 and the connecting hole 61, so as to electrically connect the positive electrode guide piece 60 and the positive electrode post 40. The shape of the positive electrode guide piece 60 is not limited, and may be, for example, a 7-shaped sheet in fig. 7, or may be other shapes in other embodiments.

In this embodiment, in order to achieve the effect of stable and sealed connection between the glue column 50 and the positive electrode column 40, the glue column 50 is provided with a glue layer to form adhesive engagement with the through hole 14 and the positive electrode column 40 respectively; specifically, before assembly, the glue posts 50 are soaked in glue and air-dried.

One preferred assembly process for the positive electrode post 40 and the glue post 50 is: firstly, the positive pole 40 is matched with the glue pole 50, namely, the extending part 41 of the positive pole 40 is completely inserted into the through hole 51 of the glue pole 50; then, both are inserted into the through hole 51; then, the inner end of the positive electrode post 40 is mechanically pressed or knocked to compress the positive electrode post 40, and the middle part of the positive electrode post 40 is expanded, so that the glue post 50 is pressed and pressed against the perforation 14, and finally, the sealing effect is achieved.

With continued reference to fig. 2, one of the side walls 10a is provided with a filling hole 15 for filling electrolyte and a steel cap 70 for sealing the filling hole 15, and the steel cap 70 is in welded engagement with the side wall 10 a. The aperture of the filling hole 15 is preferably between 0.5mm and 1.0 mm; specifically, the filling of the electrolysis is carried out by adopting a vacuum back suction method.

As shown in fig. 8, the steel cap 70 is formed by punching, shearing and pressing a SUS stainless steel sheet with a hardware die, and the steel cap 70 is made of SUS304, SUS310, SUS316L, preferably SUS316L; the stainless steel sheet from which the steel cap 70 is made has a thickness of between 0.1mm and 0.3mm, preferably 0.2mm.

The steel cap 70 is concave, and has a top ring portion 71 and a concave bottom ring portion 72, the bottom ring portion 72 is matched with the filling hole 15, the top ring portion 71 is attached to the side wall 10a, and the top ring portion 71 is matched with the side wall 10a in a welding manner by laser welding, so that the filling hole 15 is completely sealed.

Preferably, the filling hole 15 is located on the same side wall 10a as the perforation 14; still preferably, the negative electrode guide tab is also attached to the sidewall 10a where the through hole 14 is located, as shown in fig. 1.

As shown in fig. 1 and 3, the present embodiment is further provided with an explosion-proof structure, at least one explosion-proof pattern 31 is provided on the cover plate 30, and the explosion-proof pattern 31 may be linear; the explosion-proof pattern 31 is preferably at least one of a straight shape, a cross shape, a circular arc shape, an X shape or a Y shape, and of course, may be other shapes; among them, the explosion-proof pattern 31 is preferably located at a middle or edge position of the cap plate 30.

Preferably, the depth of the explosion-proof pattern 31 is 1/3-1/2 of the thickness of the cap plate 30, and when the battery is internally expanded, the explosion-proof pattern 31 is preferentially cracked for venting so as to avoid explosion.

The preferred assembly method of this embodiment is:

1) Punching the housing 10 while forming the perforation 14 and the filling hole 15;

2) The positive pole 40 and the glue pole 50 are assembled and then are inserted into the perforation 14;

3) Connecting the positive electrode guide piece 60 with the positive electrode post 40;

4) The positive electrode post 40 is mechanically pressed to expand so as to be completely fixed to the side wall 10 a;

5) The manufactured winding battery cell 20 is placed in the accommodating groove of the shell 10;

6) Welding the positive electrode guide piece 60 and the negative electrode guide piece;

7) Welding the cover plate 30 having the explosion-proof pattern 31 with the case 10;

8) Placing the battery in vacuum equipment for vacuumizing treatment, and completely immersing the side wall 10a of the filling hole 15 in electrolyte in a vacuum state to finish filling the electrolyte;

9) After the electrolyte is filled, the filling hole 15 is blocked by the steel cap 70, and the steel cap 70 and the side wall 10a of the shell 10 are welded to form a complete seal at the filling hole 15;

10 Trimming and shaping to obtain the final product.

While the utility model has been described in terms of preferred embodiments, it is not intended to limit the scope of the utility model. It is intended that all modifications within the scope of the utility model, i.e., all equivalents thereof, be embraced by the utility model as they come within their scope without departing from the utility model.

Claims

1. The utility model provides a miniature chargeable and dischargeable cell of flat thin dress, includes casing, accept in coiling electric core in the casing and sealed group connect in apron on the casing, its characterized in that: the shell is a steel shell, the cover plate is a steel cover plate, and the cover plate is welded on the shell; the shell is provided with a side wall, a through hole and a positive pole column arranged in the through hole are arranged on the side wall, and a rubber column in insulating fit with the through hole is sleeved on the positive pole column; the positive pole post is electrically connected with the positive end of the winding electric core through a positive pole guide piece, and the negative end of the winding electric core is electrically connected with the side wall through a negative pole guide piece.

2. The flat, thin, miniature rechargeable battery of claim 1, wherein: the projection shape of the shell is round, positive, rectangle, diamond, star or regular polygon.

3. The flat, thin, miniature rechargeable battery of claim 1, wherein: the winding battery core is wrapped with gummed paper for forming insulation fit with the shell.

4. The flat, thin, miniature rechargeable battery of claim 1, wherein: the thickness of the shell is 0.05mm-0.10mm.

5. The flat, thin, miniature rechargeable battery of claim 1, wherein: the cover plate is provided with at least one explosion-proof pattern.

6. The flat, thin, miniature rechargeable battery of claim 5, wherein: the explosion-proof pattern is at least one of a straight shape, a cross shape, an arc shape, an X shape or a Y shape.

7. The flat, thin, miniature rechargeable battery of claim 5, wherein: the depth of the explosion-proof pattern is 1/3-1/2 of the thickness of the cover plate.

8. The flat, thin, miniature rechargeable battery of claim 1, wherein: the side wall is provided with a filling hole for filling electrolyte and a steel cap for sealing the filling hole, and the steel cap is in welding fit with the side wall.

9. The flat, thin, miniature rechargeable battery of claim 1, wherein: and a glue layer is arranged on the glue column.

10. The flat, thin, miniature rechargeable battery of claim 1, wherein: the positive pole is T-shaped, and it has interconnect stretch into portion and spacing portion, stretch into portion with spacing portion is the column, wherein stretch into portion setting up to follow the perforation is passed and is located partly the inboard of casing, spacing portion is located the outside of casing.