Lithium battery cap explosion-proof sheet

Abstract

The utility model discloses an anti-explosion sheet for a lithium battery cap, and relates to the related technical field of lithium batteries. The device comprises a bottom fixing ring, a fixing disc, an outer connecting disc and destroying shells, an elastic ring is fixed to the peripheral side of the bottom fixing ring, the fixing disc is fixed to the top end of the elastic ring, the outer connecting disc is fixed to the top end of the fixing disc, an outer connecting ring is fixed to the peripheral side of the outer connecting disc, and the destroying shells are fixed to the bottom end of the fixing disc in an annular array mode. Each side face of the destroying shell is provided with a vent hole, and each vent hole is formed in the center of the side face of the destroying shell. Through the arrangement of the bottom fixing ring, the fixing disc, the outer connecting disc and the damage shell, the problems that the use safety of the battery is influenced by short circuit after the cap explosion-proof piece of the lithium battery is broken, and the fragments of the cap explosion-proof piece can block the exhaust position to cause the bulge phenomenon of the battery easily are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to lithium batteries, and particularly relates to an explosion-proof piece for a lithium battery cap. Background Art

[0002] The explosion-proof disc is an important component of lithium batteries. It mainly acts as a safety valve to prevent the battery from exploding under overcharge, over-discharge or other abnormal conditions. When the internal pressure of the battery exceeds a certain limit, the explosion-proof disc will rupture and release the internal pressure, thereby avoiding battery explosion. Therefore, the use of explosion-proof discs in batteries can well ensure the safety of lithium battery production, but it still has the following disadvantages in actual use:

[0003] 1. The explosion-proof piece of the lithium battery cap is directly installed with the corresponding structure during operation. When working, the pressure is too high and it breaks directly. During the tearing process, slag will be generated, which may easily cause internal short circuit of the battery and affect the safety of battery use;

[0004] 2. When the explosion-proof piece of the lithium battery cap is working, after the explosion-proof piece breaks, the direct breakage of the explosion-proof piece is easy to block the exhaust position, which will cause the exhaust speed to be not fast enough, the internal pressure of the battery to increase quickly, and the battery is prone to bulging. Utility Model Content

[0005] The utility model aims to provide a lithium battery cap explosion-proof piece, which solves the problem that the lithium battery cap explosion-proof piece breaks into the battery and short-circuits inside, affecting the safety of the battery, and the fragments of the cap explosion-proof piece may block the exhaust position, causing the battery to bulge easily, by arranging a bottom fixing ring, a fixing plate, an external connecting plate and a destruction shell.

[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model discloses an explosion-proof plate for a lithium battery cap, comprising a bottom fixing ring, a fixing plate, an external connection plate and a destruction shell, wherein an elastic ring is fixed to the peripheral side of the bottom fixing ring, a fixing plate is fixed to the top end of the elastic ring, an external connection plate is fixed to the top end of the fixing plate, an external connection ring is fixed to the peripheral side of the external connection plate, a destruction shell is fixed to the bottom end of the fixing plate in an annular array, a vent hole is provided on each side of the destruction shell, and each of the vent holes is arranged at the center of the side of the destruction shell, when working, the fixing plate is connected to the bottom fixing ring through the elastic ring on the bottom fixing ring, and aluminum foil is fixed therein, the destruction shell is fixed thereon through the fixing plate, a flexible groove is fixed thereon through the external connection plate, and when the bottom fixing ring rises, the aluminum foil in the bottom fixing ring is destroyed for ventilation through the destruction shell.

[0008] Furthermore, a lower movable ring is fixed to the top end of the bottom fixed ring, an upper movable ring is fixed to the bottom end of the fixed plate, the lower movable ring and the upper movable ring are socketed with each other, the lower movable ring on the bottom fixed ring and the upper movable ring on the fixed plate are socketed with each other, and the position between the bottom fixed ring and the fixed plate is determined.

[0009] Furthermore, an aluminum foil is fixed on the inner wall of the bottom fixing ring, and all the destruction shells are arranged above the aluminum foil. After the destruction shell is destroyed, the bottom fixing ring is exhausted through the aluminum foil.

[0010] Furthermore, an exhaust port is vertically opened in the fixing plate, and the exhaust port is arranged between the destruction shells. The fixing plate discharges the high-pressure air generated in the battery through the exhaust port.

[0011] Furthermore, a flexible groove is fixed on the top of the external connection disk, an adhesive ring is arranged in the flexible groove, the external connection disk is arranged to be through-through from top to bottom, and the external connection disk is connected to the adhesive ring through the flexible groove.

[0012] Furthermore, the destruction shell is arranged to be through-connected from top to bottom, and the main body of the destruction shell is arranged in a quadrangular pyramid, and the bottom area of ​​the destruction shell is smaller than the top area. When the destruction shell is working, it is more convenient to ventilate by being through-connected from top to bottom.

[0013] The utility model has the following beneficial effects:

[0014] 1. The utility model solves the problem that the explosion-proof piece of the lithium battery cap enters the battery interior after being broken and short-circuits, affecting the safety of battery use by arranging a bottom fixing ring, a fixing plate and a destruction shell. The bottom fixing ring and the fixing plate are connected together by an elastic ring. When the air pressure in the battery is too high, the bottom fixing ring is pushed up by the air pressure inside the battery, so that the aluminum foil is pressed onto the destruction shell, and the bottom end of the destruction shell punctures the aluminum foil. After puncturing, the high-pressure gas generated in the battery is transported to the top of the bottom fixing ring and discharged through the exhaust port on the fixing plate, thereby reducing the risk of the explosion-proof piece of the lithium battery cap entering the lithium battery interior after being broken and affecting the safety of use.

[0015] 2. The utility model solves the problem that the explosion-proof piece of the lithium battery cap may block the exhaust position and cause the battery to bulge easily by arranging the bottom fixing ring, the fixing plate, the external connecting plate and the breaking shell. When pressure is generated in the battery, the pressure increases, causing the elastic ring to bend further, so that the breaking shell punctures the aluminum foil. When the aluminum foil and the breaking shell are blocked, the bottom end of the breaking shell is arranged in a bayonet shape, and the high-pressure air in the battery enters the vent hole, and enters between the bottom fixing ring and the fixing plate through the vent hole, and is discharged through the exhaust port. The explosion-proof piece of the lithium battery cap will not block the exhaust position after being broken, thereby increasing the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a three-dimensional diagram of a partial cross-sectional structure of a lithium battery cap explosion-proof plate;

[0018] Figure 2 It is a three-dimensional diagram of the bottom fixing ring structure;

[0019] Figure 3 It is a three-dimensional diagram of the fixed disk structure;

[0020] Figure 4 It is a three-dimensional diagram of the structure of the external connection plate;

[0021] Figure 5 for Figure 4 A magnified view of the structure at A;

[0022] Figure 6 This is a three-dimensional diagram of the destroyed shell structure.

[0023] Reference numerals:

[0024] 1. Bottom fixing ring; 101. Lower movable ring; 102. Aluminum foil; 103. Elastic ring; 2. Fixing plate; 201. Upper movable ring; 202. Exhaust port; 3. External connecting plate; 301. External connecting ring; 302. Flexible groove; 303. Adhesive ring; 4. Destruction shell; 401. Vent hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Specific embodiment 1

[0027] See also Figure 1-6The utility model is a lithium battery cap explosion-proof piece, comprising a bottom fixing ring 1, a fixing plate 2, an outer connecting plate 3 and a destruction shell 4. An elastic ring 103 is fixed to the peripheral side of the bottom fixing ring 1. When the bottom fixing ring 1 is working, an aluminum foil 102 is fixed therein, and the bottom fixing ring 1 and the fixing plate 2 are connected together through the elastic ring 103. The top of the elastic ring 103 is fixed with a fixing plate 2, and the destruction shell 4 is fixed thereon through the fixing plate 2. The top of the fixing plate 2 is fixed with an outer connecting plate 3, and the peripheral side of the outer connecting plate 3 is fixed with an outer connecting ring 301 When the external connection disk 3 is working, it cooperates with the external connection function. The bottom end of the fixed disk 2 is fixed with a destroying shell 4 in a ring array. After the bottom fixing ring 1 is pushed up by the pressure inside the battery, the aluminum foil 102 in the bottom fixing ring 1 is punctured to perform ventilation. A vent hole 401 is opened on each side of the destroying shell 4, and each vent hole 401 is set at the center of the side of the destroying shell 4. The vent hole 401 on the outside of the destroying shell 4 can prevent the punctured aluminum foil 102 from exhausting smoothly during work.

[0028] Specifically, a lower movable ring 101 is fixed to the top end of the bottom fixed ring 1, and an upper movable ring 201 is fixed to the bottom end of the fixed plate 2. The lower movable ring 101 and the upper movable ring 201 are socketed with each other. By socketing the lower movable ring 101 and the upper movable ring 201 with each other, the position between the bottom fixed ring 1 and the fixed plate 2 is determined to prevent the bottom fixed ring 1 and the fixed plate 2 from being skewed.

[0029] Furthermore, an aluminum foil 102 is fixed on the inner wall of the bottom fixing ring 1, and all the breaking shells 4 are arranged above the aluminum foil 102. The bottom fixing ring 1 fixes the aluminum foil 102 therein, and when working, when the aluminum foil 102 is punctured, the high-pressure gas generated inside the battery is discharged.

[0030] The operation process of this embodiment is as follows: during operation, the bottom fixing ring 1 and the fixing plate 2 are connected together by the elastic ring 103. When the air pressure in the battery is too high, the bottom fixing ring 1 is pushed up by the air pressure inside the battery, so that the aluminum foil 102 is pressed onto the destroying shell 4, so that the bottom end of the destroying shell 4 punctures the aluminum foil 102. After puncturing, the high-pressure gas generated in the battery is transported to the top of the bottom fixing ring 1 and discharged through the exhaust port 202 on the fixing plate 2. Specific embodiment 2

[0032] See also Figure 1-6 On the basis of the first specific embodiment, an exhaust port 202 is vertically opened in the fixed disk 2, and the exhaust port 202 is arranged between the destruction shells 4. When the fixed disk 2 is working, the high-pressure gas generated in the battery is discharged through the exhaust port 202.

[0033] Specifically, a flexible groove 302 is fixed at the top of the external connecting plate 3, and an adhesive ring 303 is arranged in the flexible groove 302. The external connecting plate 3 is arranged to pass through from top to bottom. The external connecting plate 3 sets the adhesive ring 303 therein through the flexible groove 302, and the external connecting plate 3 is abutted against the installation structure through the adhesive ring 303 and bonded to the external installation structure, so that the external connecting plate 3 is bonded to the external installation structure.

[0034] Furthermore, the destructive shell 4 is set to be through-through from top to bottom, and the main body of the destructive shell 4 is set in a quadrangular pyramid, and the bottom area of ​​the destructive shell 4 is smaller than the top area. When the destructive shell 4 is working, it is through-through from top to bottom. When the destructive shell 4 pierces the aluminum foil 102, the high-pressure gas in the battery directly enters the top of the bottom fixing ring 1.

[0035] The operation process of this embodiment is as follows: during operation, when pressure is generated in the battery, the pressure increases, causing the elastic ring 103 to bend further, so that the destruction shell 4 punctures the aluminum foil 102. When the aluminum foil 102 and the destruction shell 4 are blocked, the bottom end of the destruction shell 4 is configured as a bayonet, and the high-pressure air in the battery enters the vent 401, and enters between the bottom fixing ring 1 and the fixing plate 2 through the vent 401, and is discharged through the exhaust port 202.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A lithium battery cap explosion-proof disk, comprising a bottom fixing ring (1), a fixing disk (2), an external connecting disk (3) and a destruction shell (4), characterized in that: An elastic ring (103) is fixed to the circumference of the bottom fixing ring (1), a fixing plate (2) is fixed to the top of the elastic ring (103), an external connection plate (3) is fixed to the top of the fixing plate (2), an external connection ring (301) is fixed to the circumference of the external connection plate (3), a destroying shell (4) is fixed to the bottom end of the fixing plate (2) in a circular array, a vent hole (401) is provided on each side of the destroying shell (4), and each vent hole (401) is arranged at the center of the side of the destroying shell (4).

2. The lithium battery cap explosion-proof plate according to claim 1, characterized in that: A lower movable ring (101) is fixed to the top end of the bottom fixed ring (1), and an upper movable ring (201) is fixed to the bottom end of the fixed plate (2); the lower movable ring (101) and the upper movable ring (201) are sleeved with each other.

3. The lithium battery cap explosion-proof plate according to claim 1, characterized in that: An aluminum foil (102) is fixed on the inner wall of the bottom fixing ring (1), and all the destruction shells (4) are arranged above the aluminum foil (102).

4. The lithium battery cap explosion-proof plate according to claim 1, characterized in that: An exhaust port (202) is vertically opened in the fixing plate (2), and the exhaust port (202) is arranged between the destruction shells (4).

5. The lithium battery cap explosion-proof plate according to claim 1, characterized in that: A flexible groove (302) is fixed at the top end of the external connection disk (3), an adhesive ring (303) is arranged in the flexible groove (302), and the external connection disk (3) is arranged to be through-connected from top to bottom.

6. The lithium battery cap explosion-proof plate according to claim 1, characterized in that: The destruction shell (4) is arranged to penetrate from top to bottom, and the main body of the destruction shell (4) is arranged in the shape of a quadrangular pyramid, and the bottom end area of ​​the destruction shell (4) is smaller than the top end area.

Images