CN211555975U

CN211555975U - Battery system

Info

Publication number: CN211555975U
Application number: CN201922501934.4U
Authority: CN
Inventors: 史小兵
Original assignee: Jiangsu Jingjujing Environmental Protection Technology Co ltd
Current assignee: Jiangsu Jingjujing Environmental Protection Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-22
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a battery system, including top cap, bottom, shell body, interior casing, explosion-proof equipment, wherein: the fixed top cap that is provided with in shell body top just the fixed bottom that is provided with in shell body bottom, shell body and top cap and bottom fixed connection form hollow shell structure, be provided with explosion-proof valve just on the top cap be provided with on the top cap with anodal electric connection's of battery anodal to and with battery negative pole electric connection's negative pole, the utility model discloses an explosion-proof equipment's setting can reduce the short-circuit current by a wide margin, reduces the battery short circuit and releases heat, and the influence that the inside short circuit of solution battery brought avoids the emergence of potential safety hazard.

Description

Battery system

Technical Field

The utility model belongs to the technical field of the battery preparation, concretely relates to battery system.

Background

With the rapid development of electronic products, aluminum-case batteries are widely used in the field of large-scale electric devices such as mobile communication devices, portable electronic device electric tools, electric bicycles, electric automobiles, etc., however, because most of the aluminum-case batteries are high-capacity batteries, safety concerns that have been paid extensive attention to are still restricting further development.

In the prior art, the external short circuit condition of the aluminum-shell battery is mostly solved through an explosion-proof valve.

However, in the actual use process, the internal short circuit of the aluminum-shell battery is more difficult to control and prevent than the external short circuit, once the shell body of the aluminum-shell battery is broken due to external forces such as collision and impact, the internal of the aluminum-shell battery has the risk of heat generation and fire explosion due to the short circuit of the positive electrode and the negative electrode, and if the internal reaction of the battery cell cannot be further prevented, the huge harm caused by the internal reaction of the battery cell cannot be eradicated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery system to solve foretell technical problem.

In order to achieve the above object, the utility model provides a following technical scheme: a battery system comprises a top cover, a bottom cover, an outer shell, an inner shell and an explosion-proof device, wherein:

a top cover is fixedly arranged at the top of the outer shell, and a bottom cover is fixedly arranged at the bottom of the outer shell;

the outer shell is fixedly connected with the top cover and the bottom cover to form a hollow shell structure;

the top cover is provided with an explosion-proof valve, and the top cover is provided with a positive electrode electrically connected with the positive electrode of the battery and a negative electrode electrically connected with the negative electrode of the battery;

connecting pieces are correspondingly arranged at the left side of the inner wall of the outer shell up and down, and connecting pieces are correspondingly arranged at the right side of the inner wall of the outer shell up and down;

the left side and the right side of the outer wall of the inner shell are provided with limiting pieces corresponding to the connecting pieces, and the inner shell is connected with the outer shell through the limiting pieces;

a plurality of through holes penetrating through the shell are formed in the upper side and the lower side of the inner shell in an array mode, and sealing films are arranged on the through holes;

explosion-proof devices are arranged on the upper side and the lower side of the inner shell corresponding to the through holes;

the explosion-proof device is of a hollow cavity structure, and insulating liquid is filled in the hollow cavity inside the explosion-proof device.

Preferably, the connection piece that sets up about the shell body inner wall corresponds the setting each other, set up in the connection piece bottom of shell body inner wall upside is provided with the connecting block and set up in the connection piece top of shell body inner wall downside is provided with the connecting block.

Preferably, the limiting sheet is provided with a connecting groove, and the connecting groove and the connecting block are arranged correspondingly to each other.

Preferably, the limiting sheet is of a sheet structure and can elastically deform under the action of external force.

Preferably, a hollow cavity is formed between the outer shell and the inner shell.

Preferably, the explosion-proof device is provided with a connecting hole, the connecting hole is provided with a sealing film, and the connecting hole and the through hole are arranged correspondingly.

Preferably, the hollow cavity inside the explosion-proof device is filled with carbon dioxide with a certain pressure.

The utility model discloses a technological effect and advantage: the battery system comprises:

1. if the short circuit takes place inside the battery, then can arouse the inside temperature anomaly of battery and rise, and then make and seal the membrane damaged, explosion-proof equipment inside insulating liquid then can mix with electrolyte, increases rapidly the resistance of electrolyte, reduces the short-circuit current by a wide margin, and it is exothermic to reduce the battery short circuit, and the harm that furthest reduced the battery short circuit solves the influence that the inside short circuit of battery brought, avoids the emergence of potential safety hazard.

2. When the battery is impacted or impacted by a large external force, the sealing film can be deformed, shrunk and cracked at first due to the thin film wall, the sealing condition in the explosion-proof device is damaged, and the methyl silicone oil can be sprayed into the electrolyte to be rapidly mixed with the electrolyte, so that the resistance value of the electrolyte is increased rapidly, and the explosion caused by the short circuit of the battery is avoided.

3. Through forming well cavity between outer casing and interior casing, make interior casing and shell body isolated each other, make interior casing be in more stable state, prevent that external high, low temperature from causing the influence to the interior casing to because the setting of well cavity can alleviate battery charge-discharge volume expansion problem.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

fig. 3 is a cross-sectional view of the present invention;

fig. 4 is a schematic view of the specific structure of the outer casing of the present invention.

In the figure: 1-top cover, 2-bottom cover, 3-outer shell, 4-inner shell, 5-explosion-proof device, 6-sealing film, 7-hollow cavity;

11-explosion-proof valve, 12-anode, 13-cathode;

31-connecting piece;

311-connecting block;

41-limiting piece, 42-through hole;

411-a connecting trough;

51-insulating liquid, 52-connecting hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to fig. 1-4 of the 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.

The utility model provides a battery system as shown in 1-4 in the figure, including top cap 1, bottom 2, shell body 3, interior casing 4, explosion-proof equipment 5, wherein:

a top cover 1 is fixedly arranged at the top of the outer shell 3, and a bottom cover 2 is fixedly arranged at the bottom of the outer shell 3;

the outer shell 3 can be made of metal materials such as aluminum and steel or plastic materials;

the inner shell 4 is made of inert insulating materials, the insulating property inside the battery can be enhanced, optionally, the inner shell 4 can be made of PTFE materials, and the insulating materials are stable in performance, durable, good in insulating property, corrosion-resistant and free of pollution to electrolyte.

The outer shell 3 is fixedly connected with the top cover 1 and the bottom cover 2 to form a hollow shell structure, and the outer shell 3 is fixedly connected with the top cover 1 and the bottom cover 2 in a welding mode;

be provided with explosion-proof valve 11 on top cap 1, can show the reliability that improves the battery, explosion-proof valve 11 is direct and outside through when the battery internal pressure reaches explosion-proof valve 11 pressure value that explodes, and quick disappointing avoids the battery explosion, be provided with on top cap 1 with anodal electric connection's of battery anodal positive pole 12 to and with battery negative pole electric connection's negative pole 13, anodal electric property of battery passes through the wire with positive pole 12 and is connected and battery negative pole electric property passes through the wire with negative pole 13 and is connected.

The correspondence is provided with connection piece 31 just from top to bottom in 3 inner walls left sides of shell body 3 the correspondence is provided with connection piece 31 from top to bottom in 3 inner walls right sides of shell body, the corresponding connection piece 31 in the 4 outer walls left and right sides in interior casing is provided with spacing piece 41 just interior casing 4 is connected with shell body 3 through spacing piece 41, and the accessible is pressed convenient interior casing 4 and is connected with shell body 3 to spacing piece 41.

A plurality of through holes 42 penetrating through the shell are formed in the upper side and the lower side of the inner shell 4 in an array mode, and sealing films 6 are arranged on the through holes 42;

the upper and lower both sides of interior casing 4 correspond through-hole 42 and are provided with explosion-proof device 5, explosion-proof device 5 is cavity structure just the inside cavity department of explosion-proof device 5 fills and is provided with insulating liquid 51, and explosion-proof device 5 is used for can increasing the resistance of electrolyte in the interior casing 4 with insulating liquid 51 of the inside packing of explosion-proof device 5 inflow after the inside short circuit of battery or battery striking damage.

The insulating liquid 51 can be methyl silicone oil, the methyl silicone oil has small vapor pressure, higher flash point and ignition point of about 300 ℃, has excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and smaller surface tension, can be compatible with the battery electrolyte, and can rapidly increase the resistance of the electrolyte and greatly reduce the short-circuit current because the methyl silicone oil is high-insulation alkane liquid and can be compatible with the electrolyte.

The explosion-proof device 5 is provided with a connecting hole 52, the connecting hole is provided with a sealing film 6, the connecting hole 52 and the through hole 42 are arranged correspondingly, the sealing film 6 can be a PTFE film, the PTFE film can be thermoplastic-deformable at 115-145 ℃, and the explosion-proof device can also be suitable for normal temperature rise inside a battery. After the short circuit temperature rises inside the battery, the PTFE membrane can be out of shape and break, release the inside insulating liquid 51 of explosion-proof equipment 5, if the inside short circuit that takes place of battery, then can arouse the temperature to rise unusually, and then make and seal the damage of membrane 6, the inside insulating liquid 51 of explosion-proof equipment 5 can flow into inside the interior casing 4, make insulating liquid and battery electrolyte mix, increase rapidly the resistance of electrolyte, reduce the short-circuit current by a wide margin, it is exothermic to reduce the battery short circuit, the harm of at utmost reduction battery short circuit, solve the influence that the inside short circuit of battery brought, avoid the emergence of potential safety hazard.

Specifically, the connecting pieces 31 arranged on the left and right of the inner wall of the outer shell 3 are arranged correspondingly to each other;

set up in the connection piece 31 bottom of 3 inner walls upsides of shell body be provided with connecting block 311 and set up in the connection piece 31 top of 3 inner walls of shell body downside is provided with connecting block 311, be provided with on spacing piece 41 spread groove 411 just spread groove 411 and connecting block 311 correspond the setting each other, accessible connecting block 311 and the mutual block of spread groove 411 make connection piece 31 and spacing piece 41 joint each other.

Specifically, the limiting piece 41 is of a sheet structure, the limiting piece 41 can elastically deform under external force, the limiting piece 41 can elastically deform, the limiting piece 41 can tension the connecting block 311, and the limiting piece 41 and the connecting piece 31 are clamped with each other.

Specifically, cavity 7 in forming between shell body 3 and the interior casing 4, cavity 7 can make interior casing 4 and shell body 3 isolated each other, can make interior casing 4 be in more stable state, prevents that external high, low temperature from leading to the fact the influence to interior casing 4 to because cavity 7's setting can be alleviated battery charge and discharge volume inflation problem.

Specifically, the hollow cavity inside the explosion-proof device 5 is also filled with carbon dioxide with a certain pressure, when the sealing film 6 is damaged, the carbon dioxide filled inside the explosion-proof device 5 can spray the insulating liquid 51 filled inside the explosion-proof device 5, so that the insulating liquid 51 is quickly mixed with the electrolyte of the battery, the resistance of the electrolyte is rapidly increased, the short-circuit current is greatly reduced, and the heat release of the battery due to short circuit is reduced.

The working principle is as follows: the battery system comprises:

when the aluminum-shell battery has been used the utility model discloses a battery shell, if because reasons such as aluminum-shell battery diaphragm is damaged, the damaged or outside short circuit of pole piece lead to positive negative pole direct contact, take place inside short circuit, then can lead to the temperature rising, the diaphragm shrink, roll up core deformation and take place the inflation, roll up core volume expansion because well cavity 7's setting can be alleviated, continue to rise when the inside temperature of aluminum-shell battery, when arriving 115 degrees centigrade, the PTFE membrane takes place shrink deformation, 5 internal seal conditions of explosion-proof equipment are destroyed, methyl silicon oil can spray to electrolyte in rather than the flash mixed, make electrolyte resistance value sharply rise, let short-circuit current sharply reduce, the heat production stops, the explosion that has avoided because the battery short circuit and causes.

When the aluminum hull battery used the utility model discloses a battery case, when the battery perhaps strikeed because of receiving great external force striking, seal membrane 6 because the membrane wall is thin can warp at first the shrink and split, 5 internal seal conditions of explosion-proof equipment are destroyed, methyl silicone oil can spray to electrolyte in rather than flash mixed for electrolyte resistance value sharply rises, has avoided because the explosion that the battery short circuit causes.

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 a battery system, includes top cap (1), bottom (2), shell body (3), interior casing (4), explosion-proof equipment (5), its characterized in that:

a top cover (1) is fixedly arranged at the top of the outer shell (3), and a bottom cover (2) is fixedly arranged at the bottom of the outer shell (3);

the outer shell (3) is fixedly connected with the top cover (1) and the bottom cover (2) to form a hollow shell structure;

the top cover (1) is provided with an explosion-proof valve (11), and the top cover (1) is provided with an anode (12) electrically connected with the anode of the battery and a cathode (13) electrically connected with the cathode of the battery;

connecting pieces (31) are correspondingly arranged on the left side of the inner wall of the outer shell (3) up and down, and connecting pieces (31) are correspondingly arranged on the right side of the inner wall of the outer shell (3) up and down;

limiting pieces (41) are arranged on the left side and the right side of the outer wall of the inner shell (4) corresponding to the connecting pieces (31), and the inner shell (4) is connected with the outer shell (3) through the limiting pieces (41);

a plurality of through holes (42) penetrating through the shell are formed in the upper side and the lower side of the inner shell (4) in an array mode, and sealing films (6) are arranged on the through holes (42);

explosion-proof devices (5) are arranged on the upper side and the lower side of the inner shell (4) corresponding to the through holes (42);

the explosion-proof device (5) is of a hollow cavity structure, and insulating liquid (51) is filled in the hollow cavity inside the explosion-proof device (5).

2. A battery system according to claim 1, wherein: connecting pieces (31) arranged on the left and right of the inner wall of the outer shell (3) are arranged correspondingly;

set up in connection piece (31) bottom of shell body (3) inner wall upside is provided with connecting block (311) and set up in connection piece (31) top of shell body (3) inner wall downside is provided with connecting block (311).

3. A battery system according to claim 2, wherein: the limiting piece (41) is provided with a connecting groove (411), and the connecting groove (411) and the connecting block (311) are arranged correspondingly to each other.

4. A battery system according to claim 1, wherein: the limiting sheet (41) is of a sheet structure, and the limiting sheet (41) can elastically deform under the action of external force.

5. A battery system according to claim 1, wherein: a hollow cavity (7) is formed between the outer shell (3) and the inner shell (4).

6. A battery system according to claim 1, wherein: a connecting hole (52) is formed in the explosion-proof device (5), and a sealing film (6) is arranged on the connecting hole;

the connecting holes (52) and the through holes (42) are arranged corresponding to each other.

7. A battery system according to claim 1, wherein: and carbon dioxide with certain pressure is filled in the hollow cavity in the explosion-proof device (5).