CN112993482A

CN112993482A - Quick exhaust apparatus of battery package

Info

Publication number: CN112993482A
Application number: CN202110246176.5A
Authority: CN
Inventors: 魏中洪
Original assignee: Huajing Micro Nano Technology Suzhou Co ltd
Current assignee: Huajing Micro Nano Technology Suzhou Co ltd
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2021-06-18

Abstract

The invention discloses a quick exhaust device for a battery pack. The device comprises an exhaust device, an exhaust valve plate, a valve rod and a spring, wherein the exhaust valve plate is positioned on the side surface of the exhaust device, one end of the valve rod and one end of the spring are both connected inside the exhaust device, and the other end of the valve rod and the other end of the spring are both connected with the same side of the exhaust valve plate; wherein the spring is made of a memory alloy and is capable of deforming and extending at a high temperature. The quick exhaust device for the battery pack pushes the explosion-proof valve plate to release pressure by arranging the spring made of the memory alloy with the high-temperature deformation function, and the pressure release valve can be kept in an open state during the high temperature period, so that the effect of timely and sufficient pressure release is realized, the problem of poor pressure release caused by a pressure spring switch is reduced, and the safety of the surrounding environment and a user is ensured.

Description

Quick exhaust apparatus of battery package

Technical Field

The invention relates to the field of batteries, in particular to a quick exhaust device for a battery pack.

Background

The explosion-proof valve of current battery package generally adopts the spring force to maintain the sealed of valve block, and when the battery takes place thermal runaway, inside gaseous messenger battery package internal pressure that produces risees, and when pressure was greater than the pulling force of explosion-proof valve spring, the inside gaseous blowout of explosion-proof valve port is followed to the battery package to avoid battery package casing to suffer pressure failure.

Because the deformation of the traditional spring is in direct proportion to the ejection force in the battery pack, the pressure relief of the common explosion-proof valve is carried out through the slits around the valve plate, so that the pressure relief area is small, the situation that the pressure relief is not timely occurs frequently, the battery pack shell is broken, and the safety of the surrounding environment and a user can be ensured to cause considerable potential safety hazards.

Disclosure of Invention

In order to solve the problems, the invention provides a quick exhaust device for a battery pack.

According to one aspect of the invention, the quick exhaust device for the battery pack comprises an exhaust device, an exhaust valve plate, a valve rod and a spring, wherein the exhaust valve plate is positioned on the side surface of the exhaust device; wherein the spring is made of a memory alloy and is capable of deforming and extending at a high temperature.

The quick exhaust device for the battery pack pushes the explosion-proof valve plate to release pressure by arranging the spring made of the memory alloy with the high-temperature deformation function, and the pressure release valve can be kept in an open state during the high temperature period, so that the effect of timely and sufficient pressure release is realized, the problem of poor pressure release caused by a pressure spring switch is reduced, the surrounding environment is protected from being interfered, and potential safety hazards to users are avoided.

In some embodiments, the interior of the vent has a coupling portion to which the valve stem is movably coupled. Therefore, the internal structure and the connection mode of the exhaust device are further described in detail through the arrangement of the connecting part, and the connecting part also has the effect of limiting the moving direction and the moving range of the valve rod.

In some embodiments, the valve stem and the spring are disposed side-by-side. Therefore, the structure can ensure that a certain distance is reserved between the valve rod and the spring, so that the valve rod and the spring cannot interfere with each other, and the smooth operation is ensured.

In some embodiments, the spring sleeve is disposed outside of the valve stem. Therefore, the structure can fully utilize the space in the exhaust device, and the structure of the exhaust device is not influenced by the requirement of large occupied space.

In some embodiments, the spring is attached to the connecting portion. Therefore, the structure makes full use of the structures such as the connecting part on the basis that the spring sleeve is arranged outside the valve rod, and further improves the space utilization rate.

In some embodiments, the air vent device and the air vent valve plate are sealed at normal temperature. Therefore, the exhaust device can be ensured not to leak air from the exhaust valve plate under the normal state.

In some embodiments, the spring is deformed at the elevated temperature for an extension time of no more than 15 seconds. Therefore, the situation that the exhaust time is too long accidentally can be avoided.

In some embodiments, the other side of the vent flap is provided with a gas permeable membrane. Thus, smooth gas discharge can be ensured by using the gas permeable membrane.

Drawings

Fig. 1 is a schematic structural diagram of a quick exhaust device for a battery pack according to an embodiment of the present invention;

FIG. 2 is a schematic view of the quick exhaust apparatus for battery pack shown in FIG. 1;

fig. 3 is a schematic structural view of a quick exhaust device for a battery pack according to another embodiment of the present invention.

In the figure: the air exhaust device comprises an air exhaust device 1, an air exhaust valve plate 2, a valve rod 3, a spring 4, a connecting part 5 and a breathable film 6.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 schematically shows the structure of a rapid exhaust device for a battery pack according to the present invention, and fig. 2 shows the structure of the rapid exhaust device for a battery pack of fig. 1 when exhausting. As shown in fig. 1-2, the exhaust device 1 is used in a battery pack, and has a hollow interior, an opening on one side surface, and an exhaust valve sheet 2 disposed outside the side surface, wherein the exhaust valve sheet 2 can seal the opening on the side surface of the exhaust device 1 in a natural state, i.e., at normal temperature, the space between the exhaust device 1 and the exhaust valve sheet 2 is sealed.

Preferably, a gas permeable membrane 6 can be further arranged on one side of the exhaust valve plate 2, which is away from the inside of the exhaust device 1, and the gas permeable membrane 6 can ensure smooth exhaust of gas under the condition that the temperature is not too high.

And install a valve rod 3 and a spring 4 in exhaust apparatus 1's inside, one of them one end of valve rod 3 is connected in exhaust apparatus 1's inside, and the other end is connected with the side of exhaust valve piece 2 towards exhaust apparatus 1 inside, and spring 4 is same wherein one end is connected in exhaust apparatus 1's inside, and the other end is connected with the same side of exhaust valve piece 2. The spring 4 is made of a memory alloy, and the memory alloy enables the spring 4 to deform and extend when the spring is subjected to high temperature, so that the exhaust valve plate 2 is bounced by generating elastic force.

In addition, the exhaust device 1 has a connecting part 5 inside, one end of the valve rod 3 far away from the exhaust valve plate 2 can be movably connected to the connecting part 5, and the connecting part 5 has the effect of limiting the moving direction and range of the valve rod 3.

Preferably, the valve rod 3 and the spring 4 are arranged side by side inside the exhaust device 1, with their extension directions coinciding and not interfering with each other when moving.

When the battery of battery package takes place thermal runaway, makes the inside temperature of exhaust apparatus 1 rise, the gas in exhaust apparatus 1 can be discharged from discharge valve piece 2 through ventilated membrane 6 to play the effect of preliminary pressure release. And if the reaction of out of control is too violent, the temperature rise is very fast, when the speed of producing gas is also too fast, high temperature can make the spring 4 deformation extension of making by memory alloy to push away exhaust valve piece 2 and drive the motion of valve rod 3, make and produce certain clearance between the exhaust apparatus 1, then high-temperature gas can be discharged fast in following the clearance, has improved carminative speed by a wide margin.

Because the spring 4 is made of memory alloy and has the characteristic that the deformation is controlled by the temperature, the exhaust valve plate 2 can be kept open all the time as long as the temperature in the battery pack is above a certain degree so as to facilitate continuous exhaust, and after the temperature is reduced, the spring 4 deforms and contracts, the valve rod 3 also tends to return to the original position, and the exhaust valve plate 2 can be pulled back to the side face of the exhaust device 1. Therefore, the pressure inside the battery pack can be balanced more easily, and the failure of the battery pack shell is reduced.

In addition, for further safety, the spring 4 can be additionally arranged to deform and extend at a high temperature for no more than 15 seconds, and the time is generally enough for high-temperature exhaust, so that the situation that the function of the device is influenced due to too long exhaust wet tissue is avoided.

Fig. 3 schematically shows the structure of another rapid exhaust device for a battery pack according to the present invention. As shown in fig. 3, when the size of the battery pack and the exhaust device 1 is not large, it is also considered that the spring 4 is disposed outside the valve rod 3 and the operation of the two does not affect each other. And at this moment, one end of the spring 4 far away from the exhaust valve plate 2 can be connected to the connecting part 5, so that the space utilization rate inside the exhaust device 1 is further improved.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a quick exhaust apparatus of battery package which characterized in that: the exhaust valve is characterized by comprising an exhaust device (1), an exhaust valve plate (2), a valve rod (3) and a spring (4), wherein the exhaust valve plate (2) is positioned on the side surface of the exhaust device (1), one end of the valve rod (3) and one end of the spring (4) are connected to the inside of the exhaust device (1), and the other end of the valve rod (3) and the other end of the spring are connected with the same side of the exhaust valve plate (2); wherein the spring (4) is made of a memory alloy and can be deformed and extended at a high temperature.

2. The quick exhaust device for the battery pack according to claim 1, wherein: the exhaust device (1) is internally provided with a connecting part (5), and the valve rod (3) is movably connected to the connecting part (5).

3. The quick exhaust device for the battery pack according to claim 2, wherein: the valve rod (3) and the spring (4) are arranged side by side.

4. The quick exhaust device for the battery pack according to claim 2, wherein: the spring (4) is sleeved outside the valve rod (3).

5. The quick exhaust device for the battery pack according to claim 4, wherein: the spring (4) is connected to the connecting part (5).

6. The quick exhaust device for the battery pack according to claim 1, wherein: at normal temperature, the space between the exhaust device (1) and the exhaust valve plate (2) is closed.

7. The quick exhaust device for the battery pack according to claim 1, wherein: the spring (4) is deformed and extended at high temperature for no more than 15 seconds.

8. The battery pack rapid degassing device according to any one of claims 1 to 7, characterized in that: and a breathable film (6) is arranged on the other side of the exhaust valve plate (2).