Explosion-proof cap of lithium battery

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a lithium battery explosion-proof cap which comprises a fixing ring, a steel cap used for releasing pressure is welded on the inner wall of the fixing ring, a connecting ring used for cutting off a circuit is clamped on the inner wall of the fixing ring, and a metal ring used for sealing is welded on the inner wall of the fixing ring. And one side of the metal ring is provided with a battery cell for storing electric quantity. According to the anti-explosion cap for the lithium battery, through cooperative arrangement of the fixing ring, the steel cap and the connecting ring, the device can be prevented from breaking internal parts due to overlarge internal pressure during use, so that damage to the surrounding environment caused by fragments is avoided, and the protection performance of the device under pressure is improved; the fixing ring can limit the positions of the steel cap and the connecting ring, the firmness degree of the device is improved, the steel cap can relieve pressure when the internal pressure of the device is too large, so that the battery of the device is prevented from exploding, meanwhile, the overturning piece is supported, and the overturning piece is prevented from being broken after the direction is changed.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, concretely is a lithium battery explosion -proof cap. BACKGROUND

[0002] In the existing lithium battery technology, when the pressure is abnormally increased due to overcharge, short circuit or external high temperature and other factors inside the battery, there is a risk of battery rupture or explosion, and such rupture not only causes battery failure, but also may produce fragments, causing damage to the surrounding environment and personnel, therefore, it is particularly important to design an explosion -proof cap that can effectively prevent the battery from rupturing or exploding under abnormal pressure.

[0003] Chinese patent publication No. CN203192873U discloses a lithium battery explosion -proof cap, which comprises an upper cover plate, an explosion -proof sheet and a shell, the shell is fixedly connected with the upper cover plate and the explosion -proof sheet is arranged between the two, the upper cover plate is provided with a ventilation hole, the shell is provided with a ventilation hole, the explosion -proof sheet is provided with a notch, the edge of the shell is rolled back to form a containing part, and the edge of the upper cover plate and the explosion -proof sheet is combined together and placed in the containing part, the upper cover plate, the explosion -proof sheet and the shell are wrapped together by riveting, the internal resistance is small, and it is very stable, when the internal pressure of the battery is greater than 15KG, the gas enters the notch on the explosion -proof sheet through the ventilation hole and is discharged from the ventilation hole of the upper cover plate, the exhaust pressure relief prevents the battery from exploding.

[0004] However, the utility model has the following problems in actual use:

[0005] The utility model is inconvenient for limiting the position of the internal parts during use, which may cause the internal parts to rupture due to excessive battery pressure, thereby producing fragments and damaging the surrounding environment, reducing the protection of the device. UTILITY MODEL CONTENTS

[0006] (I) Technical problem solved

[0007] In order to overcome the above-mentioned defects of the prior art, the utility model provides a lithium battery explosion -proof cap, which solves the problems in the prior art that:

[0008] The utility model is inconvenient for limiting the position of the internal parts during use, which may cause the internal parts to rupture due to excessive battery pressure, thereby producing fragments and damaging the surrounding environment, reducing the protection of the device.

[0009] (II) Technical scheme

[0010] To achieve the above object, the utility model discloses a lithium battery explosion -proof cap through the following technical schemes is realized: a lithium battery explosion -proof cap, including the fixed ring, the inner wall welding of fixed ring has the steel cap for pressure relief, the inner wall of fixed ring is connected with the connecting ring for cutting off circuit, the inner wall welding of fixed ring has the metal ring for closing, one side of metal ring is equipped with the electric core for storing electric quantity.

[0011] Optionally, the outer surface of the fixed ring is connected with a sealing ring, and the inner wall of the fixed ring is fixedly connected with an explosion-proof aluminum plate.

[0012] Optionally, the side of the steel cap is provided with an exhaust hole, and the side of the steel cap is threadedly connected with an insulating column.

[0013] Optionally, the side of the connecting ring is fixedly connected with a thermistor, and the outer surface of the thermistor is connected with the inner wall of the fixed ring.

[0014] Optionally, the inner wall of the connecting ring is fixedly connected with a flip piece, and one side of the flip piece is welded with one side of the metal ring.

[0015] Optionally, the side of the metal ring is provided with a breathable hole, and the side of the metal ring is fixedly connected with a contact.

[0016] Optionally, the outer surface of the electric core is fixedly connected with a shell, and one side of the shell is welded with a negative cover plate.

[0017] Optionally, one end of the electric core is welded with a tab, and the other end of the tab is welded with one side of the metal ring.

[0018] (Three) beneficial effects

[0019] The utility model provides a lithium battery explosion -proof cap has the following beneficial effects:

[0020] The lithium battery explosion -proof cap, through the cooperation of fixed ring, steel cap and connecting ring, can prevent the rupture of internal parts caused by excessive internal pressure of the device during use, thereby causing damage to the surrounding environment, and improve the protection of the device when subjected to pressure, the fixed ring can limit the position of the steel cap and the connecting ring, improve the firmness of the device, the steel cap can relieve pressure when the internal pressure of the device is too large, thereby preventing the explosion of the device battery, and supporting the flip piece, preventing the rupture of the flip piece after changing direction, the connecting ring can cut off the current when the internal pressure of the battery is too large, preventing the battery from continuing to heat up and causing the battery to burn, and increasing the practicability of the device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The utility model structure schematic diagram is provided for the utility model structure schematic diagram.

[0022] Figure 2 is a fixed ring structure schematic view of the utility model;

[0023] Figure 3 is a steel cap structure schematic view of the utility model;

[0024] Figure 4 is a connecting ring structure schematic view of the utility model;

[0025] Figure 5 is a metal ring structure schematic view of the utility model.

[0026] In the figure: 1, fixed ring;2, steel cap;3, connecting ring;4, metal ring;5, electric core;6, sealing ring;7, explosion-proof aluminum plate;8, exhaust hole;9, insulating column;10, thermistor;11, turnover piece;12, air hole;13, contact;14, shell;15, negative cover plate;16, tab. Specific implementation

[0027] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0028] Please refer to Figures 1 to 5 The utility model provides a kind of technical scheme: a lithium battery explosion-proof cap, the lithium battery explosion-proof cap mainly applied to the scene when preventing explosion when lithium battery internal pressure is too large. Embodiment one:

[0029] Please refer to Figures 1 to 4 In order to prevent internal parts from breaking when in use, fixed ring 1, steel cap 2 and connecting ring 3 are provided.

[0030] The inner wall of the fixed ring 1 is welded with a steel cap 2 for pressure relief, the inner wall of the fixed ring 1 is clamped with a connecting ring 3 for cutting off the circuit, the outer surface of the fixed ring 1 is clamped with a sealing ring 6, the inner wall of the fixed ring 1 is fixedly connected with an explosion-proof aluminum plate 7, one side of the steel cap 2 is provided with an exhaust hole 8, one side of the steel cap 2 is threadedly connected with an insulating column 9, one side of the connecting ring 3 is fixedly connected with a thermistor 10, the outer surface of the thermistor 10 is clamped with the inner wall of the fixed ring 1, the inner wall of the connecting ring 3 is fixedly connected with a flip piece 11, one side of the flip piece 11 is welded with one side of a metal ring 4, the fixed ring 1 is used as a core support structure, the inner wall of the fixed ring 1 is welded with the steel cap 2, the steel cap 2 is provided with the exhaust hole 8 for timely pressure relief when the internal pressure of the battery is abnormal, at the same time, the steel cap 2 is threadedly connected with the insulating column 9 on one side, which can support the flip piece 11 and prevent the flip piece 11 from breaking after changing direction, the inner wall of the fixed ring 1 is also clamped with the connecting ring 3, the connecting ring 3 is fixedly connected with the thermistor 10 on one side, which can trigger the circuit cutting mechanism through the resistance value change of the thermistor 10 when the temperature of the battery abnormally rises, at the same time, the flip piece 11 on the inner wall of the connecting ring 3 is welded with one side of the metal ring 4, which can deform under the action of pressure, further ensuring the circuit cutting, in addition, the outer surface of the fixed ring 1 is clamped with the sealing ring 6, which enhances the sealing between the explosion-proof cap and the battery shell, preventing external substances from invading, the inner wall of the fixed ring 1 is also fixedly connected with the explosion-proof aluminum plate 7, which is an additional explosion-proof layer, further improving the safety performance of the battery and increasing the protection of the device. Example two:

[0031] Please refer to Figure 1 and Figure 5 , in order to make the device can discharge the pressure inside the battery when in use, provided with a metal ring 4;

[0032] The inner wall of the fixed ring 1 is welded with a metal ring 4 for closing, the metal ring 4 is provided with a gas permeable hole 12 on one side, the metal ring 4 is fixedly connected with a contact 13 on one side, the metal ring 4 is provided with a gas permeable hole 12 on one side, these gas permeable holes 12 can allow pressure gas to be discharged in an orderly manner when the internal pressure of the battery rises to a dangerous level, thereby avoiding the battery from breaking or exploding due to excessive internal pressure, in addition, the metal ring 4 is also fixedly connected with the contact 13 on one side, the contact 13 forms a circuit connection with other parts of the battery, ensuring the current transmission of the battery in the normal working state and increasing the practicability of the device. Example three:

[0033] Please refer to Figure 1 and Figure 5 , in order to make the device can store electricity when in use, provided with an electric core 5;

[0034] One side of the metal ring 4 is provided with an electric core 5 for storing electric quantity, the outer surface of the electric core 5 is fixedly connected with an outer shell 14, one side of the outer shell 14 is welded with a negative cover plate 15, one end of the electric core 5 is welded with a tab 16, the other end of the tab 16 is welded with one side of the metal ring 4, the electric core 5 is arranged on one side of the metal ring 4 and is responsible for storing the electric quantity provided by the battery, in order to protect the electric core 5 from the interference and damage of the external environment, a solid outer shell 14 is fixedly connected with the outer surface of the electric core 5, in addition, the negative cover plate 15 is welded on one side of the outer shell 14, as a part of the negative pole of the battery, the integrity of the battery circuit and the normal flow of current are ensured, one end of the electric core 5 is welded with the tab 16 as a key conductive connection point, the other end of the tab 16 is welded with one side of the metal ring 4, so that the circuit connection between the electric core 5 and other parts of the battery is realized, and reliable energy guarantee is provided for the normal operation of the device.

[0035] The electrical components in the present application are all connected with the main controller and 220V mains electricity, and the main controller can be a conventional known device such as a computer.

[0036] In the utility model, the working steps of the device are as follows:

[0037] Firstly, when the internal pressure of the battery is too large, the internal pressure is released through the exhaust hole 8 on the steel cap 2, secondly, the abnormal rise of the battery temperature is sensed by the thermistor 10 on the connecting ring 3, the circuit cutting mechanism is triggered, the flip piece 11 is deformed under the action of the pressure, and the circuit is further cut off, then the air permeable hole 12 on the metal ring 4 maintains the air permeability of the battery interior, and the smooth progress of the pressure relief process is ensured, finally, the electric core 5 is connected with the metal ring 4 through the tab 16, but after the connecting ring 3 cuts off the circuit, the battery stops working, and further temperature rise is prevented.

[0038] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A lithium battery explosion-proof cover cap comprising a fixing ring (1), characterized in that: The inner wall of the fixed ring (1) is welded with a steel cap (2) for pressure relief, the inner wall of the fixed ring (1) is clamped with a connecting ring (3) for cutting off the circuit, the inner wall of the fixed ring (1) is welded with a metal ring (4) for closing, one side of the metal ring (4) is provided with a battery core (5) for storing electric quantity.

2. The explosion-proof cap of a lithium battery according to claim 1, characterized in that: The outer surface of the fixed ring (1) is clamped with a sealing ring (6), and the inner wall of the fixed ring (1) is fixedly connected with an explosion-proof aluminum plate (7).

3. The explosion-proof cap of a lithium battery according to claim 1, characterized in that: One side of the steel cap (2) is provided with an exhaust hole (8), and one side of the steel cap (2) is threadedly connected with an insulating column (9).

4. The explosion-proof cap of lithium battery according to claim 1, characterized in that: One side of the connecting ring (3) is fixedly connected with a thermistor (10), and the outer surface of the thermistor (10) is clamped with the inner wall of the fixed ring (1).

5. A vented cap for a lithium battery according to claim 4, wherein: The inner wall of the connecting ring (3) is fixedly connected with a turnover piece (11), and one side of the turnover piece (11) is welded with one side of the metal ring (4).

6. The explosion-proof cap of a lithium battery according to claim 1, characterized in that: One side of the metal ring (4) is provided with a breathable hole (12), and one side of the metal ring (4) is fixedly connected with a contact (13).

7. The explosion-proof cap of a lithium battery according to claim 1, characterized in that: The outer surface of the battery core (5) is fixedly connected with an outer shell (14), and one side of the outer shell (14) is welded with a negative cover plate (15).

8. A vented cap for a lithium battery according to claim 7, wherein: One end of the battery core (5) is welded with a tab (16), and the other end of the tab (16) is welded with one side of the metal ring (4).

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