CN221176554U - Electricity core pressure release exhaust apparatus - Google Patents

Abstract

The utility model discloses a battery cell pressure relief exhaust device which comprises an exhaust body, wherein a structural member is connected to the exhaust body, an inner cavity is formed between the exhaust body and the structural member, a boss and a sealing cover are arranged in the inner cavity, the boss is connected with the exhaust body, a first exhaust channel is arranged on the exhaust body and the boss in a penetrating manner, a second exhaust channel is arranged on the structural member in a penetrating manner, the sealing cover is arranged at one end, away from the exhaust body, of the boss, a liquid sealing edge is arranged at the edge of the sealing cover, sealing liquid is arranged in the inner cavity, and the battery cell pressure relief exhaust device further comprises an elastic piece used for driving the sealing cover to be abutted against the boss. The pressure release and exhaust device for the battery cell can rapidly release the internal pressure of the battery cell when the internal pressure of the battery cell is abnormally and rapidly increased due to overcharging, short circuit, heating and the like, has certain tightness after the pressure is released, and prevents the safety risk caused by the entering of external air, moisture and the like into the battery cell.

Description

Electricity core pressure release exhaust apparatus

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell pressure relief exhaust device.

Background

The battery cell pressure release valve can release pressure when the internal pressure of the battery cell rises to a certain threshold value, so that explosion of the battery cell caused by overhigh internal pressure is avoided, and the safety of the battery cell is improved.

The current mainstream pressure relief valve design scheme is that a bursting disc with a notch is arranged on a certain part of a battery cell top cover or a shell, and the bursting pressure is adjusted through the control of the notch. When the internal pressure of the battery cell exceeds the maximum pressure born by the notch, the metal sheet is cracked from the notch, so that the purpose of releasing the pressure is achieved.

However, the pressure release valve fails after once opening, and the purpose of exhausting the gas generated in the normal use process of the battery cell cannot be achieved. And after the valve is opened, the explosion-proof sheet cannot be recovered, the inside of the battery cell is communicated with the external environment, and the risk of further fire and explosion caused by the reaction heat release of oxygen, moisture and the like entering the inside of the battery cell and the pole piece and the like of the external environment exists.

Disclosure of utility model

1. Technical problem to be solved by the utility model

The utility model aims to solve the technical problems in the prior art and provides a battery cell pressure relief and exhaust device, which can rapidly release the internal pressure of a battery cell when the internal pressure of the battery cell is abnormally and rapidly increased due to overcharging, short circuit, heating and the like, has certain tightness after the pressure is released, and prevents the safety risk caused by the entering of external air, moisture and the like into the battery cell.

2. Technical proposal

In order to solve the problems, the technical scheme provided by the utility model is as follows:

The utility model provides a electricity core pressure release exhaust apparatus, includes the exhaust body, be connected with the structure on the exhaust body, the exhaust body with form the inner chamber between the structure, be equipped with boss and sealed lid in the inner chamber, the boss is connected the exhaust body, the exhaust body with run through on the boss and be provided with first exhaust passage, run through on the structure and be provided with the second exhaust passage, sealed lid is located deviate from on the boss the one end of exhaust body, sealed lid's edge is equipped with liquid banding, there is the sealing fluid in the inner chamber, still including be used for driving sealed lid butt in elastic component on the boss.

Optionally, a sealing gasket is arranged on one side of the sealing cover, which is abutted with the boss.

Optionally, the elastic element is arranged between the structural member and the sealing cover.

Optionally, a ventilation protection sheet covering the second exhaust passage is arranged on the structural member.

Optionally, the ventilation protection sheet is arranged on one side of the structural member, which is away from the inner cavity.

Optionally, the structural member is welded to the exhaust body.

Optionally, the exhaust body and the boss are integrally formed.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

This electricity core pressure release exhaust apparatus when electricity core normal use produced gas, can be with the gaseous exhaust of producing, does not influence its leakproofness simultaneously. When the internal pressure of the battery cell is abnormally and rapidly increased due to overcharging, short circuit, heating and the like, the internal pressure of the battery cell can be rapidly released, and the battery cell has certain tightness after the pressure is released, so that the safety risk caused by the entering of external air, moisture and the like into the battery cell is prevented.

Drawings

Fig. 1 is a schematic cross-sectional view of a battery cell pressure relief exhaust device according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a structural member in a pressure relief exhaust device for a battery cell according to an embodiment of the present utility model;

1. An exhaust body; 2. structural members; 3. an inner cavity; 4. a boss; 5. sealing cover; 6. a first exhaust passage; 7. a second exhaust passage; 8. sealing edges by liquid; 9. an elastic member; 10. a sealing gasket; 11. and a ventilation protective sheet.

Detailed Description

The present utility model will be further described in detail with reference to the drawings and the detailed description, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "mounted," "positioned," "secured" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered as being "fixedly connected" to another element, the two elements may be fixed by a detachable connection manner, or may be fixed by a non-detachable connection manner, such as sleeving, clamping, integrally forming, or welding, which may be implemented in the prior art, and thus, the description is not further omitted. When an element is perpendicular or nearly perpendicular to another element, it is meant that the ideal conditions for both are perpendicular, but certain vertical errors may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The terms "first" and "second" as used herein do not denote a particular quantity or order, but rather are used to distinguish one element from another.

In combination with fig. 1 and 2, a pressure release exhaust device for a battery cell of this embodiment includes an exhaust body 1, be connected with structure 2 on the exhaust body 1, structure 2 locates exhaust body 1 top, exhaust body 1 with form inner chamber 3 between the structure 2, be equipped with boss 4 and sealed lid 5 in the inner chamber 3, boss 4 connects exhaust body 1, exhaust body 1 with run through on boss 4 and be provided with first exhaust passage 6, run through on the structure 2 and be provided with second exhaust passage 7, first exhaust passage 6 with second exhaust passage 7 all with inner chamber 3 intercommunication, sealed lid 5 locates on boss 4 deviates from exhaust body 1's one end, sealed lid 5 locates boss 4 with between the structure 2, boss 4 with the interval between the structure 2 is greater than sealed lid 5's thickness, sealed lid 5's edge is equipped with banding 8, liquid banding 8 encircles boss 4 sets up, there is sealed liquid in inner chamber 3, sealed liquid 8 is in the sealing cap 5, the sealing cap is still in the sealing face of sealing face 5 is gone up to the elastic seal face of end 5, the sealing face is realized to the sealing face that the elastic seal face is in the sealing face of the sealing face 5, the sealing face is less than 5 to the sealing face is realized to the elastic seal face seal 2, and seal face seal 5 has realized in the sealing face seal 2, and seal face seal 5 is in the sealing face that has been used for the elastic seal face seal 2 to the sealing face seal 2.

When the battery cell generates gas in the normal use process, the gas accumulates, the gas pressure rises to the sealing pressure of the sealing cover 5 regulated and controlled by the elastic piece 9, the sealing cover 5 is jacked up by the gas in the battery cell, the gas in the battery cell passes through the sealing liquid to reach the inner cavity 3 (if the lower port is not immersed in the sealing liquid after the sealing cover 5 is jacked up, the gas can directly enter the inner cavity 3), and then the gas is discharged out of the battery cell through the second exhaust channel 7. After the pressure is released, the sealing cover 5 seals the first exhaust channel 6 again under the pressure of the elastic piece 9, the sealing liquid continues to play a secondary sealing role, and the battery cell can continue to be used normally.

When the battery cell generates a large amount of gas in a short time due to overcharging, short circuit, heating and the like, the gas pushes up the sealing cover 5, passes through the inner cavity 3 and is discharged out of the battery cell through the second exhaust channel 7. After severe gas generation, even though the sealing liquid possibly loses the sealing function because the sealing liquid is carried out of the inner cavity 3 by gas, the sealing cover 5 still can be pressed on the upper part of the first exhaust channel 6 again under the action of the elastic piece 9, so that external oxygen and moisture are prevented from entering the battery cell to react with the pole piece, and the safety risks such as fire and explosion caused by the reaction are avoided.

This electricity core pressure release exhaust apparatus when electricity core normal use produced gas, can be with the gaseous exhaust of producing, does not influence its leakproofness simultaneously. When the internal pressure of the battery cell is abnormally and rapidly increased due to overcharging, short circuit, heating and the like, the internal pressure of the battery cell can be rapidly released, and the battery cell has certain tightness after the pressure is released, so that the safety risk caused by the entering of external air, moisture and the like into the battery cell is prevented.

As an alternative of the present utility model, the exhaust body 1 may be integrally formed with the cover plate or the housing of the battery cell, or may be separately formed and then connected to the cover plate or the housing by welding, etc., and the first exhaust channel 6 is communicated with the inside of the battery cell.

As an alternative of the present utility model, in order to improve the sealing property when the sealing cover 5 is abutted against the boss 4, a gasket 10 is provided on the sealing cover 5 at a side abutted against the boss 4, and the gasket 10 is adhered to the sealing cover 5.

As an alternative of the present utility model, the structural member 2 is provided with a ventilation protection sheet 11 covering the second exhaust channel 7, and the ventilation protection sheet 11 allows gas to permeate therethrough, but can prevent the sealing liquid from leaking from the inner cavity 3 to the outside of the pressure release valve, and can prevent contaminants such as external liquid, dust and the like from entering the inside of the pressure release valve.

As an alternative of the present utility model, the ventilation protection sheet 11 is disposed on the side of the structural member 2 facing away from the inner cavity 3, that is, on the outer side of the structural member 2, so that the ventilation protection sheet 11 can be directly pushed open by high pressure during severe gas generation, and can also be melted at high temperature.

As an alternative scheme of the utility model, in order to ensure the tightness of the cell pressure relief exhaust device, the structural member 2 is welded on the exhaust body 1, and the exhaust body 1 and the boss 4 are integrally formed.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (7)

1. The utility model provides a electricity core pressure release exhaust apparatus which characterized in that: including the exhaust body, be connected with the structure on the exhaust body, the exhaust body with form the inner chamber between the structure, be equipped with boss and sealed lid in the inner chamber, the boss is connected the exhaust body, the exhaust body with run through on the boss and be provided with first exhaust passage, run through on the structure and be provided with the second exhaust passage, sealed lid is located deviate from on the boss the one end of exhaust body, sealed lid's edge is equipped with liquid banding, there is the sealing fluid in the inner chamber, still including being used for order about sealed lid butt in elastic component on the boss.

2. The cell pressure relief vent of claim 1, wherein: and a sealing gasket is arranged on one side of the sealing cover, which is abutted against the boss.

3. The cell pressure relief vent of claim 1, wherein: the elastic piece is arranged between the structural piece and the sealing cover.

4. The cell pressure relief vent of claim 1, wherein: and the structural member is provided with a ventilation protection sheet for covering the second exhaust passage.

5. The cell pressure relief vent of claim 4, wherein: the ventilation protection sheet is arranged on one side of the structural member, which is away from the inner cavity.

6. A cell pressure relief vent according to any one of claims 1-5, wherein: the structural member is welded and connected to the exhaust body.

7. The cell pressure relief vent of claim 6, wherein: the exhaust body and the boss are integrally formed.