CN213845376U

CN213845376U - Explosion-proof cap of cylindrical lithium ion battery

Info

Publication number: CN213845376U
Application number: CN202022965199.5U
Authority: CN
Inventors: 黄百胜
Original assignee: Huizhou Yulong Battery Fittings Co ltd
Current assignee: Huizhou Yulong Battery Fittings Co ltd
Priority date: 2020-12-12
Filing date: 2020-12-12
Publication date: 2021-07-30
Anticipated expiration: 2030-12-12

Abstract

The utility model discloses an explosion-proof block of cylinder lithium ion battery, including the block main part, the inside wall of block main part is provided with first sealing washer, the first annular fixed plate of inner wall fixedly connected with and the second annular fixed plate of first sealing washer, be provided with the flexure strip between first annular fixed plate and the second annular fixed plate, the below of flexure strip is provided with the connecting plate, the lower surface of connecting plate and the interior diapire fixed connection of block main part, the top of flexure strip is provided with the permeability diaphragm, the inside wall fixed connection of permeability diaphragm and first annular fixed plate, the top of permeability diaphragm is provided with the upper cover. The utility model provides high explosion-proof block's sealed effect, when having avoided the inside gas of battery to break through explosion-proof diaphragm simultaneously and emit through the bleeder vent, the electrolyte leaks thereupon and causes pollution and damage to the surface of battery and peripheral equipment, has certain practicality.

Description

Explosion-proof cap of cylindrical lithium ion battery

Technical Field

The utility model relates to a lithium cell technical field especially relates to an explosion-proof block of cylinder lithium ion battery.

Background

The lithium battery is a kind of battery using lithium metal or lithium alloy as negative electrode material and non-aqueous electrolyte solution, has the advantages of high specific energy, low self-discharge, light weight, long service life, environmental protection and the like, and is widely applied to electronic instruments, digital products and household electrical appliances. At present, a lithium battery cap is the most important safety guarantee component of a lithium battery, and the structure and the production process of the cap directly or indirectly influence the performance of the lithium battery and the manufacturing cost of a battery manufacturer; be equipped with battery roll core and electrolyte in the lithium cell casing, the explosion-proof principle of the explosion-proof block of battery is when making inside atmospheric pressure grow to a definite value because of producing gas in the lithium cell, inside gas can break explosion-proof piece and discharge from the exhaust hole, thereby avoid the battery to produce the explosion because of inside atmospheric pressure is too high, the leakproofness of the explosion-proof block of current cylinder lithium cell is not good enough, and when the explosion-proof diaphragm of too big break of lithium cell inside atmospheric pressure passes through the exhaust hole and emits, the electrolyte leaks along with it easily, the surface and the peripheral equipment of battery can be polluted by the electrolyte and damage.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing an explosion-proof cap of a cylindrical lithium ion battery.

In order to achieve the above purpose, the utility model adopts the following technical scheme: an explosion-proof cap of a cylindrical lithium ion battery comprises a cap body, wherein a first sealing ring is arranged on the inner side wall of the cap body, a first annular fixing plate and a second annular fixing plate are fixedly connected to the inner wall of the first sealing ring, an elastic sheet is arranged between the first annular fixing plate and the second annular fixing plate, a connecting plate is arranged below the elastic sheet, the lower surface of the connecting plate is fixedly connected with the inner bottom wall of the cap body, a permeable membrane is arranged above the elastic sheet and fixedly connected with the inner side wall of the first annular fixing plate, an upper cover is arranged above the permeable membrane, the side edge of the upper cover is positioned between the first annular fixing plate and the inner top wall of the cap body, a heat dissipation layer is arranged on the inner wall of the upper cover, air holes are formed in the surface of the upper cover, and two through holes are formed in the surface of the elastic sheet, two the inside of through-hole all is provided with explosion-proof diaphragm, the bottom fixedly connected with installation cover of block main part, the below of block main part is provided with battery case, battery case's top is located the inside of installation cover.

As a further description of the above technical solution:

the middle position of the elastic sheet is arranged in a spherical bulge, and the two through holes are respectively positioned on two sides of the spherical bulge.

As a further description of the above technical solution:

an air inlet is formed in the middle of the connecting plate and is located right below the spherical bulge in the middle of the elastic sheet.

As a further description of the above technical solution:

the inner bottom wall of the mounting sleeve is provided with a second sealing ring, and the second sealing ring is in close contact with the top side wall of the battery shell.

As a further description of the above technical solution:

and a dust screen is arranged in the air holes.

As a further description of the above technical solution:

the permeable membrane is a polyvinyl chloride waterproof breathable membrane.

As a further description of the above technical solution:

the heat dissipation layer is made of silver metal.

The utility model discloses following beneficial effect has:

1. the utility model discloses a through the middle part that sets up be the protruding elastic sheet that sets up of hemisphere the leakproofness of main part of has improved, the elastic sheet has certain elasticity, can produce the extrusion to first sealing washer for it is sealed more inseparable, when the inside atmospheric pressure of lithium cell is great, gaseous can spill over through the air inlet, produce the extrusion to the bellying of elastic sheet, further improve the leakproofness of block body, the leakproofness between block main part and the battery case that second sealing washer between installation cover and the battery case also strengthened greatly simultaneously.

2. The utility model discloses a setting of permeability membrane piece plays the effect of blockking to electrolyte when making the broken gas outflow of explosion-proof membrane piece, avoids the electrolyte to spill the peripheral production influence along with the bleeder vent, and the heat dissipation layer of silver matter has improved the thermal diffusivity of block main part simultaneously, makes the use that can be better of lithium cell.

Drawings

Fig. 1 is a main sectional view of an explosion-proof cap for a cylindrical lithium ion battery according to the present invention;

fig. 2 is an enlarged view of a cylindrical lithium ion battery explosion-proof cap a provided by the present invention;

fig. 3 is an enlarged view of B of the explosion-proof cap for a cylindrical lithium ion battery provided by the present invention.

Illustration of the drawings:

1. a cap body; 2. a connecting plate; 3. an elastic sheet; 4. an upper cover; 5. a permeable membrane; 6. a first seal ring; 7. a first annular fixed plate; 8. a through hole; 9. an explosion-proof membrane; 10. a heat dissipation layer; 11. air holes are formed; 12. a dust screen; 13. a battery case; 14. installing a sleeve; 15. a second seal ring; 16. an air inlet; 17. and a second annular fixing plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do 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; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-3, the present invention provides an embodiment: an explosion-proof cap of a cylindrical lithium ion battery comprises a cap main body 1, wherein a first sealing ring 6 is arranged on the inner side wall of the cap main body 1, a first annular fixing plate 7 and a second annular fixing plate 17 are fixedly connected to the inner wall of the first sealing ring 6, an elastic sheet 3 is arranged between the first annular fixing plate 7 and the second annular fixing plate 17, a connecting plate 2 is arranged below the elastic sheet 3, the lower surface of the connecting plate 2 is fixedly connected with the inner bottom wall of the cap main body 1, a permeable membrane 5 is arranged above the elastic sheet 3, the permeable membrane 5 is fixedly connected with the inner side wall of the first annular fixing plate 7, an upper cover 4 is arranged above the permeable membrane 5, the side edge of the upper cover 4 is positioned between the first annular fixing plate 7 and the inner top wall of the cap main body 1, a heat dissipation layer 10 is arranged on the inner wall of the upper cover 4, air holes 11 are formed in the surface of the upper cover 4, two through holes 8 are formed in the surface of the elastic sheet 3, the explosion-proof membranes 9 are arranged inside the two through holes 8, the bottom of the cap main body 1 is fixedly connected with a mounting sleeve 14, a battery shell 13 is arranged below the cap main body 1, and the top end of the battery shell 13 is located inside the mounting sleeve 14.

The middle part of the elastic sheet 3 is arranged in a spherical bulge, and the two through holes 8 are respectively positioned on two sides of the spherical bulge, so that explosion prevention is facilitated; an air inlet 16 is formed in the middle of the connecting plate 2, the air inlet 16 is positioned right below the spherical bulge in the middle of the elastic sheet 3, and the sealing performance can be further improved under the pressure of air; a second sealing ring 15 is arranged on the inner bottom wall of the mounting sleeve 14, and the second sealing ring 15 is tightly contacted with the top side wall of the battery shell 13, so that the sealing property between the cap main body 1 and the battery shell 13 is improved; a dustproof net 12 is arranged inside the air holes 11 to play a dustproof role; the permeable membrane 5 is a polyvinyl chloride waterproof breathable membrane, so that the influence on peripheral equipment caused by electrolyte leakage in the process of exhausting is avoided; the heat dissipation layer 10 is made of silver metal, and has a better heat dissipation effect than copper.

The working principle is as follows: the flexure strip 3 has certain elasticity, can produce the extrusion to first sealing washer 6, make it more inseparabler to seal, when the inside atmospheric pressure of lithium cell is great, gas can spill over through inlet port 16, produce the extrusion to the protruding department of flexure strip 3, further improve the leakproofness of block main part 1, reach the certain degree when the inside atmospheric pressure of lithium cell, when gaseous can not get rid of and can make the battery produce the explosion, gas can break explosion-proof diaphragm 9 and discharge, simultaneously permeable diaphragm 5 plays the effect of blockking to electrolyte when making explosion-proof diaphragm 9 membrane gas outflow, avoid the electrolyte to spill to produce the influence to peripheral along with gas through bleeder vent 11, simultaneously silver's heat dissipation layer 10 has improved the thermal diffusivity of block main part 1, make the use that can be better of lithium cell.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides an explosion-proof cap of cylinder lithium ion battery, includes cap main part (1), its characterized in that: the inner side wall of the cap main body (1) is provided with a first sealing ring (6), the inner wall of the first sealing ring (6) is fixedly connected with a first annular fixing plate (7) and a second annular fixing plate (17), an elastic sheet (3) is arranged between the first annular fixing plate (7) and the second annular fixing plate (17), a connecting plate (2) is arranged below the elastic sheet (3), the lower surface of the connecting plate (2) is fixedly connected with the inner bottom wall of the cap main body (1), a permeable membrane (5) is arranged above the elastic sheet (3), the permeable membrane (5) is fixedly connected with the inner side wall of the first annular fixing plate (7), an upper cover (4) is arranged above the permeable membrane (5), the side edge of the upper cover (4) is positioned between the inner top wall of the first annular fixing plate (7) and the cap main body (1), the inner wall of upper cover (4) is provided with heat dissipation layer (10), bleeder vent (11) have been seted up on the surface of upper cover (4), two through-holes (8), two have been seted up on the surface of flexure strip (3) the inside of through-hole (8) all is provided with explosion-proof diaphragm (9), the bottom fixedly connected with installation cover (14) of block main part (1), the below of block main part (1) is provided with battery case (13), the top of battery case (13) is located the inside of installation cover (14).

2. The cylindrical lithium ion battery explosion-proof cap of claim 1, characterized in that: the middle position of the elastic piece (3) is arranged in a spherical bulge, and the two through holes (8) are respectively positioned on two sides of the spherical bulge.

3. The cylindrical lithium ion battery explosion-proof cap of claim 1, characterized in that: an air inlet hole (16) is formed in the middle of the connecting plate (2), and the air inlet hole (16) is located right below the spherical bulge in the middle of the elastic sheet (3).

4. The cylindrical lithium ion battery explosion-proof cap of claim 1, characterized in that: the inner bottom wall of the mounting sleeve (14) is provided with a second sealing ring (15), and the second sealing ring (15) is in close contact with the top side wall of the battery shell (13).

5. The cylindrical lithium ion battery explosion-proof cap of claim 1, characterized in that: and a dust screen (12) is arranged in the air holes (11).

6. The cylindrical lithium ion battery explosion-proof cap of claim 1, characterized in that: the permeable membrane (5) is a polyvinyl chloride waterproof breathable film.

7. The cylindrical lithium ion battery explosion-proof cap of claim 1, characterized in that: the heat dissipation layer (10) is made of silver metal.