CN211295156U

CN211295156U - Flame-retardant protective housing of lithium battery and high-safety lithium battery

Info

Publication number: CN211295156U
Application number: CN202020251790.1U
Authority: CN
Inventors: 刘仕仁; 朴永丰
Original assignee: Shenzhen Xinghui Network Technology Co ltd
Current assignee: Huizhou Ronghui Technology Co ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-08-18
Anticipated expiration: 2030-03-04

Abstract

The utility model belongs to the technical field of lithium batteries, and discloses a lithium battery flame-retardant protective shell and a high-safety lithium battery, wherein the flame-retardant protective shell comprises a shell body and a cover plate; an accommodating cavity is formed in the shell, and two adjacent side walls of the accommodating cavity are in an open shape; the cover plate is of an L-shaped structure and is connected to the side walls of the two openings of the accommodating cavity in a sealing manner; a limiting clamping strip is arranged at one opening of the accommodating cavity, a clamping groove is formed in the cover plate, and the clamping groove is matched with the limiting clamping strip; the limiting clamping strip comprises an extending part and a fixing part, and the clamping groove comprises a first limiting groove and a second limiting groove which are respectively matched with the extending part and the fixing part; in conclusion, based on the mutual matching of the shell and the cover plate, the closed protection of the lithium battery core is realized, and the explosion problem of the lithium battery is effectively avoided, so that the use safety of the lithium battery is improved; and, the utility model discloses in, the casing is convenient with the apron cooperation, and stable in structure, leakproofness are good.

Description

Flame-retardant protective housing of lithium battery and high-safety lithium battery

Technical Field

The utility model belongs to the technical field of the lithium cell, concretely relates to fire-retardant protective housing of lithium cell and high safe lithium cell.

Background

With the rapid development of electronic devices, lithium batteries have become a power source for many electronic and electrical products requiring rechargeable batteries due to their advantages of high capacity, long cycle life, no memory effect, low self-discharge rate, environmental friendliness, etc.

Meanwhile, safety accidents in use of lithium batteries frequently occur, for example, in the case of disconnection of a battery, the temperature of a battery core rapidly rises to cause melting of a protective film on the surface of the battery core, and at the moment, an electrolyte leakage phenomenon occurs, and an electrode and an electrolyte interface react violently to cause explosion of the lithium battery. In practical use, the probability of explosion caused by the existing lithium battery is far higher than that of other traditional batteries, so that the lithium battery has important significance on the research on the use safety of the lithium battery.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a fire-retardant protective housing of lithium cell and high safe lithium cell to improve the safety in utilization of current lithium cell.

In order to achieve the above object, the utility model provides a following technical scheme: a flame-retardant protective shell for a lithium battery comprises a shell and a cover plate; an accommodating cavity is formed in the shell, and two adjacent side walls of the accommodating cavity are in an open shape; the cover plate is of an L-shaped structure and is connected to the side walls of the two openings of the accommodating cavity in a sealing manner;

a limiting clamping strip is arranged at one opening of the accommodating cavity, a clamping groove is formed in the cover plate, and the clamping groove is matched with the limiting clamping strip;

the limiting clamping strip comprises an extending portion and a fixing portion, a blind hole is formed in the fixing portion, the clamping groove comprises a first limiting groove and a second limiting groove, a through hole is formed in the position, corresponding to the second limiting groove, of the cover plate, the through hole and the blind hole are threaded holes, and fixed connection is formed through bolts.

Preferably, the cover plate comprises a first sealing portion and a second sealing portion which are connected with each other, the clamping groove is formed in the second sealing portion, and the first sealing portion is provided with an electrode hole in a penetrating mode.

Preferably, the number of the extending portions is two, and the two extending portions are symmetrically clamped at two sides of the second sealing portion and connected with the fixing portion to form a U-shaped structure.

Preferably, the inner walls of the shell and the cover plate are adhered with hot melt films, buffer cavities are formed between the inner walls of the shell and the cover plate and the hot melt films, buffer cotton is filled in the buffer cavities, and a fire retardant is adsorbed in the buffer cotton. Further, the buffer cotton is of a honeycomb structure.

Preferably, the housing and the cover plate are made of at least one metal material or alloy material selected from iron, steel, copper and aluminum.

The utility model provides a high safe lithium cell, includes the battery core, the one end of battery core is equipped with the electrode, and the battery core is sealed places in the intracavity that holds of above-mentioned fire-retardant protective housing, and the electrode runs through the apron.

Compared with the prior art, the utility model, following beneficial effect has:

(1) the utility model discloses based on casing and apron mutually support, realize the closed protection to lithium cell core, effectively avoid the lithium cell to appear the explosion problem to the safety in utilization of lithium cell has been improved; and, the utility model discloses in, the casing is convenient with the apron cooperation, and stable in structure, leakproofness are good.

(2) The inner wall of casing and apron all covers the hot melt membrane, and press from both sides between hot melt membrane and the inner wall and be equipped with the buffering cotton, adsorb simultaneously based on the buffering cotton and have deposited the fire retardant, realizes the cushioning effect between protective housing and the battery core on the one hand, and on the other hand when the battery core temperature risees, effectively releases the fire retardant based on dissolving of hot melt membrane, realizes the flame retardant efficiency to the lithium cell, has further avoided the problem of lithium cell burning, explosion.

Drawings

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

fig. 2 is a schematic view of the combination of the housing and the battery cell of the present invention;

FIG. 3 is an enlarged view taken at A in FIG. 1;

FIG. 4 is an enlarged view of FIG. 2 at B;

fig. 5 is a cross-sectional view of the housing of the present invention.

In the figure: 1-shell, 11-accommodating cavity, 12-limiting clamping strip, 121-extending part, 122-fixing part, 123-blind hole, 13-buffer cotton, 14-hot melt film, 2-cover plate, 21-first sealing part, 211-electrode hole, 22-second sealing part, 23-first limiting groove, 24-second limiting groove, 25-through hole and 3-battery core.

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.

Referring to fig. 1 to 5, the present invention provides a lithium battery flame-retardant protective casing, which includes a casing 1 and a cover plate 2; an accommodating cavity 11 is formed in the shell 1, and two adjacent side walls of the accommodating cavity 11 are in an open shape; the cover plate 2 is of an L-shaped structure, and the cover plate 2 is hermetically connected to the two opening side walls of the accommodating cavity 11;

a limiting clamping strip 12 is arranged at one opening of the accommodating cavity 11, a clamping groove is arranged on the cover plate 2, and the clamping groove is matched with the limiting clamping strip 12;

spacing card strip 12 includes extension 121 and fixed part 122, and has seted up blind hole 123 on the fixed part 122, and the draw-in groove includes first spacing groove 23 and second spacing groove 24, and the position department that corresponds with second spacing groove 24 on the apron 2 has seted up through-hole 25, and through-hole 25 and blind hole 123 are the screw hole to form fixed connection through the bolt.

Based on the structure, the assembly process of the shell 1 and the cover plate 2 is realized as follows:

the first limiting groove 23 on the cover plate 2 is aligned to the extending portion 121 at the opening of the accommodating cavity 11, the cover plate 2 is inserted into the extending direction of the extending portion 121, the opening of the accommodating cavity 11 is gradually sealed by the cover plate 2, the cover plate 2 cannot move until the fixing portion 122 is matched with the second limiting groove 24, the opening of the accommodating cavity 11 is sealed, then the bolt is taken and screwed into the through hole 25, in the process, the bolt penetrates through the through hole 25 and is inserted into the blind hole 123, therefore, the cover plate 2 is fixed, and the whole assembly is completed.

The assembly is simple to operate and accurate in positioning, and the shell 1 and the cover plate 2 are in double fit based on the limiting structure and the fixing structure, so that the stability of fit is effectively guaranteed; therefore, when the fixing structure (bolt) loosens, the protection effect and the sealing performance of the whole protection shell cannot be influenced.

To sum up, arrange the battery core 3 of lithium cell in and hold chamber 11 after, whole protective housing can stably realize the protection of battery core 3, avoids battery core 3 explosion phenomenon to appear, improves the safety in utilization of lithium cell.

Preferably, the cover plate 2 includes a first sealing portion 21 and a second sealing portion 22 connected to each other, the clamping groove is formed in the second sealing portion 22, and the first sealing portion 21 is provided with an electrode hole 211 in a penetrating manner.

Preferably, there are two extending portions 121, and the two extending portions 121 are symmetrically engaged with two sides of the second sealing portion 22 and connected to the fixing portion 122 to form a U-shaped structure. Specifically, based on the setting of U type structure for the both sides homoenergetic of second sealing 22 form and restrict, has further improved spacing stability between casing 1 and the apron 2 from this.

Preferably, the inner walls of the shell 1 and the cover plate 2 are adhered with hot melt films 14, buffer cavities are formed between the inner walls of the shell 1 and the cover plate 2 and the hot melt films 14, buffer cotton 13 is filled in the buffer cavities, and fire retardants are adsorbed in the buffer cotton 13.

Specifically, the arrangement of the hot melt film 14 and the buffer cotton 13 can effectively realize the buffer effect after the battery core 3 is placed in the accommodating cavity 11; in addition, when the battery core 3 appears the short circuit, the temperature of battery core 3 itself can rise rapidly, and hot melt film 14 can melt gradually along with the rise of battery core 3 temperature, makes the cotton 13 of buffering and battery core 3 contact from this, does not influence the buffering that the cotton 13 of buffering formed to battery core 3 this moment, simultaneously, still plays flame retardant efficiency to battery core 3 under the high temperature state based on the adsorbed fire retardant in the cotton 13 of buffering to the problem of lithium cell burning, explosion has further been avoided.

Further, the cushion cotton 13 has a honeycomb structure (not shown). Its purpose is to guarantee that the buffering cotton 13 can have abundant specific surface area and be used for absorbing and storing the fire retardant, and then guarantees that the fire retardant of storing on the buffering cotton 13 has effectual flame retardant efficiency, can not exert an influence to the performance when whole lithium cell normal use simultaneously.

In a preferred embodiment, the housing 1 and the cover plate 2 are made of a metal material, such as at least one metal material or alloy material selected from iron, steel, copper and aluminum.

Referring to fig. 2, the present invention further provides a high safety lithium battery, which includes a battery core 3, an electrode is disposed at one end of the battery core 3, the battery core 3 is hermetically disposed in the accommodating cavity 11 of the flame-retardant protective housing, and the electrode penetrates through the cover plate 2.

Specifically, as can be seen from fig. 2, when the battery core 3 and the flame-retardant protective housing are assembled, the battery core 3 is placed into the accommodating cavity 11 in the direction of the arrow shown in fig. 2, and the electrode of the battery core 3 is ensured to be exposed outside the housing 1, then the cover plate 2 and the housing 1 are assembled, and after the assembly, the electrode of the battery core 3 penetrates through the cover plate 2 through the electrode hole 211.

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

Claims

1. The flame-retardant protective shell for the lithium battery is characterized by comprising a shell (1) and a cover plate (2); an accommodating cavity (11) is formed in the shell (1), and two adjacent side walls of the accommodating cavity (11) are in an open shape; the cover plate (2) is of an L-shaped structure, and the cover plate (2) is connected to the side walls of the two openings of the accommodating cavity (11) in a sealing manner;

a limiting clamping strip (12) is arranged at one opening of the accommodating cavity (11), a clamping groove is formed in the cover plate (2), and the clamping groove is matched with the limiting clamping strip (12);

spacing card strip (12) include extension (121) and fixed part (122), and seted up blind hole (123) on fixed part (122), the draw-in groove includes first spacing groove (23) and second spacing groove (24), and the position department that corresponds with second spacing groove (24) on apron (2) has seted up through-hole (25), through-hole (25) and blind hole (123) are the screw hole to form fixed connection through the bolt.

2. The flame-retardant protective case for a lithium battery as claimed in claim 1, wherein: the cover plate (2) comprises a first sealing portion (21) and a second sealing portion (22) which are connected with each other, the clamping groove is formed in the second sealing portion (22), and the first sealing portion (21) is provided with an electrode hole (211) in a penetrating mode.

3. The flame-retardant protective case for a lithium battery as claimed in claim 2, wherein: the number of the extending parts (121) is two, and the two extending parts (121) are symmetrically clamped at two sides of the second sealing part (22) and connected with the fixing part (122) to form a U-shaped structure.

4. The flame-retardant protective case for a lithium battery as claimed in claim 1, wherein: all be stained with hot melt film (14) on the inner wall of casing (1) and apron (2), and all be formed with the cushion chamber between the inner wall of casing (1) and apron (2) and hot melt film (14), the cushion intracavity is filled has buffering cotton (13), and absorbs the fire retardant in buffering cotton (13).

5. The flame-retardant protective shell for the lithium battery as claimed in claim 4, wherein: the buffer cotton (13) is of a honeycomb structure.

6. A high-safety lithium battery, which is characterized by comprising a battery core (3), wherein one end of the battery core (3) is provided with an electrode, the battery core (3) is hermetically placed in the accommodating cavity (11) of the flame-retardant protective shell as claimed in any one of claims 1 to 5, and the electrode penetrates through the cover plate (2).