CN111720598A

CN111720598A - Explosion-proof valve of battery pack and battery pack

Info

Publication number: CN111720598A
Application number: CN202010621462.0A
Authority: CN
Inventors: 黄毅轩; 张海建; 陈许超; 张德磊; 云静; 梁建鹏; 王路
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-09-29
Anticipated expiration: 2040-06-30
Also published as: CN111720598B

Abstract

The utility model relates to an explosion-proof valve and battery package of battery package, explosion-proof valve includes: the valve body is used for being installed on the shell of the battery pack and is provided with a plurality of first air holes; the valve plate assembly is arranged on the valve body and provided with a closing position and a first opening position, and the valve core mechanism comprises a push rod and a locking piece, wherein the push rod movably penetrates through a shaft hole, the locking piece is movably arranged on the push rod and can move along the axial direction relative to the valve body, the locking piece rotates relative to the push rod to switch between a first circumferential position and a second circumferential position relative to the push rod, the locking piece is located in the shaft hole at the first circumferential position, the locking piece is located outside the shaft hole at the second circumferential position to keep the valve plate assembly at the first opening position, the locking piece is provided with a constraint part, a constraint joint part is arranged in the shaft hole, the constraint part is matched with the joint part to limit the locking piece to rotate relative to the push rod, and the constraint part is separated from the joint part to enable the locking piece to be stopped at the outer side of the shaft hole.

Description

Explosion-proof valve of battery pack and battery pack

Technical Field

The utility model relates to a power battery technical field, specifically relates to an explosion-proof valve and battery package of battery package.

Background

The modern vehicle industry is revolutionizing that the conventional fuel vehicle is gradually replaced by a new energy vehicle, wherein an electric vehicle is emerging as a new energy vehicle, wherein the energy density of the battery pack of the new energy vehicle is directly related to the improvement of the driving range of the whole vehicle. In the related art, when thermal runaway occurs in a battery core of a battery pack with high energy density, a large amount of gas can be generated in a short time, which easily causes the battery pack to catch fire or even explode, and endangers the safety of passengers, so that the development of an explosion-proof valve capable of continuously and rapidly relieving pressure is urgently needed.

Disclosure of Invention

The purpose of this disclosure is to provide an explosion-proof valve of battery package that can last quick pressure release.

In order to accomplish the above object, the present disclosure provides an explosion-proof valve of a battery pack, the explosion-proof valve including: the valve body is used for being installed on a shell of a battery pack, the valve body is provided with a shaft hole and a first end surface and a second end surface along the axial direction, the second end surface is used for being in sealing fit with the outer surface of the shell of the battery pack, and the valve body is provided with a plurality of first air holes which are axially communicated; a valve plate assembly disposed on a first side of the first end surface of the valve body and having a closed position in which the valve plate assembly is attached to the first end surface to block the first vent at the first side and a first open position in which the valve plate assembly is spaced from the first end surface to allow the first vent to communicate with an external environment from the first side; and a valve core mechanism including a push rod movably disposed through the axial bore and having a first end portion and a second end portion axially opposite to each other, the first end portion being connected to the valve plate assembly, the second end portion being exposed at the second end face, a lock member movably disposed on the push rod and axially movable relative to the valve body, the lock member being rotatable relative to the push rod to switch between a first circumferential position and a second circumferential position relative to the push rod, wherein in the first circumferential position, the lock member is at least partially located in the axial bore, and in the second circumferential position, the lock member is entirely located outside the axial bore and on the first side and between the first end face and the valve plate assembly to hold the valve plate assembly in the first open position, wherein the lock member is provided with a restraining portion, a restraining engagement portion is provided in the shaft hole, the restraining portion cooperates with the restraining engagement portion to restrict rotation of the lock member relative to the push rod when the lock member is in the first circumferential position, and the restraining portion disengages from the restraining engagement portion and stops the lock member outside the shaft hole when the lock member is in the second circumferential position.

Optionally, the restraining portion is configured as a restraining protrusion, the restraining engagement portion is configured as an axially extending keyway in which the restraining protrusion fits when the lock is in the first circumferential position, and the keyway extends at least to the first end face to enable the restraining protrusion to be disengaged therefrom to allow the lock to be shifted to the second circumferential position.

Optionally, a guide structure is configured between the restraining protrusion and the push rod, the guide structure being capable of guiding the lock member to rotate relative to the push rod toward the second circumferential position when the restraining protrusion is disengaged from the keyway.

Optionally, the locking member is configured to be annular and sleeved on the push rod, the restraining protrusion is formed on an outer peripheral surface of the locking member, a first limiting protrusion fitted in the key groove is formed on the outer peripheral surface of the push rod, the guiding structure includes a first guiding inclined surface formed on the restraining protrusion and a second guiding inclined surface formed on the first limiting protrusion, the first guiding inclined surface and the second guiding inclined surface are matched and configured to convert axial movement of the locking member relative to the push rod into rotation of the locking member relative to the push rod, so that the locking member is switched between the first circumferential position and the second circumferential position.

Optionally, the lock member is formed with a limit groove, and when the lock member is located at the second circumferential position, the first limit protrusion is partially inserted into the limit groove to keep the second guide slope and the first guide slope in a fitting state all the time through the limit groove.

Optionally, the valve core mechanism includes an elastic thrust member, and the elastic thrust member provides axial elastic force for the locking member to press the first limiting protrusion.

Optionally, the valve core mechanism includes an actuating member configured to rotate the lock member toward the second circumferential position relative to the push rod when the lock member is disengaged from the shaft hole.

Optionally, the valve core mechanism includes a pressure adjusting member and a force application bolt fixed to the second end portion, one end of the pressure adjusting member abuts against the second end face, and the other end abuts against the force application bolt.

Optionally, the push rod is formed with a ventilation shaft hole penetrating through the push rod, the valve plate assembly comprises a cover plate and a ventilation plate, the cover plate and the ventilation plate are arranged in parallel and at intervals, the ventilation plate is arranged on one side, deviating from the first end face, of the cover plate, the ventilation plate is provided with an annular circumferential protrusion, the annular circumferential protrusion abuts against the cover plate so as to define a circulation space together with the cover plate and the ventilation plate, the cover plate is connected with the push rod, the ventilation shaft hole is communicated with the circulation space, the first end portion of the push rod is covered with a waterproof ventilation film, and the annular circumferential protrusion is formed with at least one second ventilation hole.

According to a second aspect of the present disclosure, there is provided a battery pack including the explosion-proof valve of the battery pack as described above.

Through the technical scheme, in the explosion-proof valve of the battery pack provided by the disclosure, the first air hole can be communicated with the inside of the shell when the explosion-proof valve is arranged on the shell of the battery pack, and when the valve plate assembly is at the first open position, the first air hole can realize the communication between the inside of the shell and the external environment, so that the pressure in the shell can be discharged, and when the valve plate assembly is at the closed position, the communication between the inside of the shell and the external environment can be cut off, so that no external impurities enter the battery pack under the normal working state; the first end part of the push rod is exposed to the second end surface, namely, the push rod can be positioned in the shell, so that the push rod can be driven by air pressure or a power device in the shell to push the valve plate component; the locking piece is located the shaft hole at least partially and is restricted for the push rod rotation when first axial position, can prevent like this that the unexpected rotation of locking piece from leading to unable switching to second axial position, the locking piece is located between first terminal surface and the valve plate subassembly and the backstop is in the outside in shaft hole when second circumferential position, like this, the locking piece then can't get back to in the shaft hole and make the valve plate subassembly continuously keep at first open position, and then make the valve body can continuously let out the inside pressure of casing with certain rate, and even the internal pressure of casing diminishes, the position of valve plate subassembly can not change yet, the explosion-proof valve of this disclosure can continuously let out the inside pressure of battery package fast promptly, promote the security of battery package.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic perspective view of an explosion-proof valve of a battery pack provided according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional structural schematic view of an explosion-proof valve of a battery pack provided in accordance with an embodiment of the present disclosure, wherein the valve plate assembly is in a closed position;

fig. 3 is a schematic cross-sectional structural view of an explosion-proof valve of a battery pack provided according to an embodiment of the present disclosure, wherein the explosion-proof valve is in a first open position;

fig. 4 is an exploded view of an explosion-proof valve of a battery pack provided according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a valve body in an explosion-proof valve of a battery pack provided according to an embodiment of the present disclosure;

fig. 6 is an exploded view of a push rod and a locking member of an explosion-proof valve of a battery pack provided according to an embodiment of the present disclosure;

fig. 7 is a schematic view of a portion of the structure of an explosion-proof valve of a battery pack provided in accordance with an embodiment of the present disclosure, wherein the valve plate assembly is in a closed position;

fig. 8 is a schematic structural view of an explosion-proof valve of a battery pack provided according to an embodiment of the present disclosure, wherein the valve plate assembly is in a first open position;

fig. 9 is an assembly schematic view of a push rod and a cover plate in an explosion-proof valve of a battery pack provided according to an embodiment of the disclosure;

fig. 10 is a schematic structural diagram of a vent plate in an explosion-proof valve of a battery pack provided according to an embodiment of the disclosure.

Description of the reference numerals

1-valve body, 11-first vent hole, 12-shaft hole, 13-key groove, 14-mounting hole, 2-valve plate component, 20-second vent hole, 21-cover plate, 22-vent plate, 221-annular circumferential bulge, 31-push rod, 311-first limit bulge, 312-vent shaft hole, 313-second limit bulge, 32-locking piece, 321-constraint bulge, 322-limit groove, 41-first guide inclined plane, 42-second guide inclined plane, 5-elastic thrust piece, 6-force application bolt, 61-radial flange, 62-third vent hole, 7-pressure adjusting piece, 81-first sealing ring and 82-second sealing ring.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, the use of directional terms such as "inner and outer" means inner and outer of the profile of each component part itself, unless otherwise stated. The terms "first and second" are used herein to distinguish one element from another, and are not necessarily order nor importance. Moreover, in the following description, when referring to the figures, the same reference numbers in different figures denote the same or similar elements.

According to an embodiment of the present disclosure, there is provided an explosion-proof valve of a battery pack, an example of which is shown in fig. 1 to 10, and as shown in fig. 1 to 4, the explosion-proof valve including: the valve body 1 is used for being installed on a shell of a battery pack and is fixed to the shell through a fastening piece through an installation hole 14 shown in fig. 1, the valve body 1 is provided with a shaft hole 12 and is provided with a first end face and a second end face along the axial direction, the second end face is used for being in sealing fit with the outer surface of the shell of the battery pack through a first sealing ring 81, and the valve body 1 is provided with a plurality of first air vents 11 which penetrate axially; the valve plate assembly 2 is arranged on a first side where a first end face of the valve body 1 is located, and is provided with a closing position and a first opening position, in the closing position, the valve plate assembly 2 is attached to the first end face to seal the first air vent 11 on the first side, and in the first opening position, a spacing distance is arranged between the valve plate assembly 2 and the first end face to allow the first air vent 11 to be communicated with the external environment from the first side; and a valve core mechanism including a push rod 31 and a lock member 32, the push rod 31 being movably inserted through the shaft hole 12 and having a first end portion and a second end portion that are opposite to each other in an axial direction, the first end portion being connected to the valve plate assembly 2, the second end portion being exposed to the second end surface, the lock member 32 being movably provided on the push rod 31 and being movable in the axial direction relative to the valve body 1, the lock member 32 being rotatable relative to the push rod 31 to switch between a first circumferential position and a second circumferential position relative to the push rod 31, wherein in the first circumferential position, the lock member 32 is located at least partially in the shaft hole 12, and in the second circumferential position, the lock member 32 is located entirely outside the shaft hole 12 and on a first side and between the first end surface and the valve plate assembly 2 to hold the valve plate assembly 2 in the first open position, wherein the lock member 32 is provided with a restraining portion, and a restraining engagement portion is, the restraining portion engages with the restraining engagement portion to restrain the lock member 32 from rotating relative to the push rod 31 when the lock member 32 is at the first circumferential position, and the restraining portion disengages from the restraining engagement portion and stops the lock member 32 outside the shaft hole 12 when the lock member 32 is at the second circumferential position.

Through the technical scheme, in the explosion-proof valve of the battery pack provided by the disclosure, the first air hole 11 can be communicated with the inside of the shell when the explosion-proof valve is installed on the shell of the battery pack, and when the valve plate assembly 2 is at the first open position, the first air hole 11 can realize the communication between the inside of the shell and the external environment, so that the pressure in the shell can be discharged, and when the valve plate assembly 2 is at the closed position, the communication between the inside of the shell and the external environment can be cut off, so that no external impurities enter the battery pack under the normal working state; the first end of the push rod 31 is exposed to the second end face, that is, can be located in the housing, so that the push rod 31 can be driven by the air pressure or the power device inside the housing to push the valve plate assembly 2; referring to fig. 2, the locking member 32 is at least partially located in the axial hole 12 and is limited to rotate relative to the push rod 31 in the first axial position, so that the locking member 32 is prevented from being accidentally rotated to fail to switch to the second axial position, referring to fig. 3, in the second circumferential position, the locking member 32 is located between the first end surface and the valve plate assembly 2 and stops at the outer side of the axial hole 12, so that the locking member 32 cannot return to the axial hole 12, the valve plate assembly 2 is continuously kept at the first open position, the valve body 1 is continuously discharged the pressure inside the housing at a certain rate, and even if the internal pressure of the housing is reduced, the position of the valve plate assembly 2 is not changed, that is, the explosion-proof valve of the present disclosure is continuously and quickly discharged the pressure inside the battery pack, and the safety of the battery pack is improved.

It should be noted that, the valve plate assembly 2 may further have a second open position, in the second open position, the locking member 32 is at least partially located in the shaft hole 12, and the push rod 31 can drive the locking member 32 and the valve plate assembly 2 to move axially upward, that is, can drive the locking member 32 and the valve plate assembly 2 to move to the first side or to the second side, so that the valve plate assembly 2 can reciprocate between the second open position and the closed position, thereby implementing reuse of the explosion-proof valve and improving its versatility, such a situation may be applicable to that when the pressure inside the housing does not reach the preset value, and when the pressure inside the housing at least equals the preset value, the valve plate assembly 2 is located at the first open position, so as to continuously and quickly release the pressure inside the housing. In addition, the above-mentioned "rotation" means in the present disclosure that the lock member 32 rotates around the axis, e.g., the central axis, of the push rod 31, and the present disclosure will not be described in detail in the following embodiments. In addition, the present disclosure may adjust the separation distance between the valve plate assembly 2 and the valve body 1 by adjusting the length of the locking member 32 in the axial direction to accommodate the rate of air permeation when the valve plate assembly 2 is in the first open position, maximizing the rate of air permeation as much as possible.

It should be further noted that the push rod 31 of the present disclosure may be pushed by the gas pressure inside the housing to move axially, and may also be matched with a reset mechanism to realize the reciprocating movement of the valve body 1 between the second open position and the closed position, which is not limited by the present disclosure, of course, the push rod 31 may also be driven by a power device, and the power device can drive the valve plate assembly 2 to be located at the first open position when the pressure inside the housing is at least equal to the preset value, and the present disclosure only takes the former as an example for exemplary description. In addition, the present disclosure does not limit the specific engagement relationship between the push rod 31 and the lock member 32, and the present disclosure will also be described in detail in the following embodiments. In addition, the specific structure of the constraining portion and the constraining joint portion is also not limited, and the present disclosure will also be described in detail in the following embodiments.

In the specific embodiment provided by the present disclosure, referring to fig. 4 to 6, the restraining portion may be configured as a restraining protrusion 321, the restraining engagement portion may be configured as a key groove 13 extending in the axial direction, the restraining protrusion 321 is fitted in the key groove 13 when the lock member 32 is located at the first circumferential position, and the key groove 13 extends at least to the first end surface so that the restraining protrusion 321 can escape therefrom to allow the lock member 32 to shift to the second circumferential position. In this way, the restricting protrusion 321 can be disposed in the key groove 13 at the first circumferential position, so that the lock member 32 does not rotate relative to the push rod 31 and the valve body 1, and when the switch is made from the first circumferential position to the second circumferential position, the lock member 32 rotates, so that the key groove 13 and the restricting protrusion 321 are circumferentially displaced, so that the lock member 32 cannot return to the shaft hole 12, and the structure is simple and easy to implement.

It should be noted that the constraining protrusions 321 and the key slots 13 may be provided in pairs, and the valve core mechanism may include at least one pair of constraining protrusions 321 and key slots 13, so as to ensure the stability of the locking member 32 at least located in the shaft hole 12 and the reliability between the first end surface and the valve plate assembly 2, where the rotation of the locking member 32 should be designed such that at least one constraining protrusion 321 is circumferentially displaced from each key slot 13 in the second circumferential position.

Of course, the constraining portion and the constraining engaging portion of the present disclosure may also be configured in other embodiments, for example, the constraining portion is configured as an external spline, the constraining engaging portion is configured as an internal spline, and the present disclosure describes the constraining portion as the constraining protrusion 321, and the constraining engaging portion as the key groove 13 in detail.

In some embodiments, a guide structure may be configured between the restricting protrusion 321 and the push rod 31, and the guide structure can guide the lock member 32 to rotate towards the second circumferential position relative to the push rod 31 when the restricting protrusion 321 is disengaged from the key groove 13, so that the guide structure can guide the lock member 32 to rotate on one hand, and also improve the smoothness of the lock member 32 when rotating on the other hand. Here, the present disclosure does not limit the specific structure of the guide structure, and the present disclosure will be described in detail in the following embodiments.

Alternatively, referring to fig. 6 to 8, the locking member 32 may be configured in a ring shape and sleeved on the push rod 31 to ensure stability when the locking member 32 is installed and rotated, the restricting protrusion 321 is formed on an outer circumferential surface of the locking member 32, the outer circumferential surface of the push rod 31 is formed with a first limit protrusion 311 fitted in the key groove 13, the guide structure includes a first guide slope 41 formed on the restricting protrusion 321 and a second guide slope 42 formed on the first limit protrusion 311, and the first guide slope 41 and the second guide slope 42 are fitted and configured to convert axial movement of the locking member 32 relative to the push rod 31 into rotation of the locking member 32 relative to the push rod 31 so that the locking member 32 is switched between the first circumferential position and the second circumferential position. In the first circumferential position, the restriction protrusion 321 and the first limit protrusion 311 are both engaged in the key slot 13, and at this time, the first guiding inclined surface 41 is engaged with the second guiding inclined surface 42, and since the locking member 32 and the push rod 31 do not rotate, the first guiding inclined surface 41 and the second guiding inclined surface 42 do not slide relative to each other in the first circumferential position; when switching from the first circumferential position to the second axial position, the engagement of the first guide slope 41 and the second guide slope 42 converts the axial force into a rotational force, so that the lock 32 can be smoothly rotated.

It should be noted that the locking member 32 should be driven by a driving device for moving the locking member axially relative to the push rod 31, and therefore, according to some embodiments, referring to fig. 7 and 8, the valve core mechanism may include an elastic thrust member 5, and the elastic thrust member 5 provides the locking member 32 with an axial elastic force pressing against the first limit protrusion 311. Here, referring to fig. 2 and 7, in the first circumferential position, due to the above-mentioned limitation of the locking member 32 by the key groove 13, the elastic thrust member 5 can be stably compressed between the valve plate assembly 2 and the locking member 32 without the elastic force being released, and in the process of switching from the first circumferential position to the second circumferential position, referring to fig. 3 and 8, the locking member 32 exits the shaft hole 12 without being limited by the shaft hole 12, so that the elastic force of the elastic thrust member 5 is released, that is, the locking member 32 can be rotated by the guide structure. Furthermore, the elastic thrusting member 5 herein may be configured as a compression spring, to which the present disclosure is not limited.

It should also be noted that the present disclosure does not limit the specific arrangement of the first guide slope 41 and the second guide slope 42, for example, according to some embodiments, the first guide slope 41 and the second guide slope 42 can both intersect with the central axis of the push rod 31 and both have a dimension in the radial direction of the push rod 31.

Alternatively, referring to fig. 6 to 8, the lock member 32 is formed with a stopper groove 322, and the first stopper protrusion 311 may be partially inserted into the stopper groove 322 to keep the second guide slope 42 and the first guide slope 41 always in the engaged state by the stopper groove 322 when the lock member 32 is located at the second circumferential position. Thus, the stopper groove 322 can prevent the first guide slope 41 and the second guide slope 42 from being disengaged and prevent the lock member 32 from being accidentally rotated, and the stopper groove 322 can also function as the first stopper protrusion 311 of the accommodating portion.

In an embodiment of the present disclosure, the valve core mechanism includes an actuatable member configured to rotate the lock member 32 toward the second circumferential position relative to the push rod 31 when the lock member 32 is disengaged from the shaft hole 12. Here, the actuating member may be configured as the above-mentioned elastic thrust member 5 and engaged with the guide mechanism, and may also be configured as a torsion spring or the like to directly drive the locking member 32 to rotate toward the second circumferential position, which is not limited by the present disclosure.

In an embodiment of the present disclosure, referring to fig. 1 to 3, the spool mechanism may include a pressure adjuster 7 and a force application bolt 6 fixed to the second end portion, one end of the pressure adjuster 7 abuts against the second end face, and the other end abuts against the force application bolt 6. In this way, the pressure inside the case can act on the pressure adjuster 7 through the force application bolt 6, and the pressure adjuster 7 can adjust the internal pressure of the battery pack required when the lock 32 is located at the second circumferential position, thereby making the explosion-proof valve more flexible.

According to some embodiments, referring to fig. 1 to 3, the pressure adjusting member 7 may be configured as a compression spring sleeved on the push rod 31, and since the length of the push rod 31 pushing the lock member 32 to move axially is substantially fixed when the lock member 32 is located at the second circumferential position, the internal pressure of the battery pack required when the lock member 32 is located at the second circumferential position can be adjusted by adjusting the elastic coefficient of the compression spring.

Alternatively, the pressure-regulating member 7 is configured as a compression spring and has a stress concentration point from which the pressure-regulating member 7 is broken to release its own elastic force at the second circumferential position. In this way, the pressure adjusting member 7 is enabled to push the push rod 31 to move towards the first side only, and in the second circumferential position, the push rod 31 is not subjected to a force pushing itself to move towards the second side, and the push rod 31 can be kept at the original position, further ensuring that the valve plate assembly 2 can be stably kept at the first open position.

Alternatively, referring to fig. 1 to 3, the force application bolt 6 has a radial flange 61, and the radial flange 61 can increase the force receiving area of the force application bolt 6, so that the force application bolt 6 can be pushed more easily.

In a specific embodiment of the present disclosure, referring to fig. 9 and 10, the push rod 31 may be formed with a vent hole 312 penetrating through the push rod 31, the valve plate assembly 2 includes a cover plate 21 and a vent plate 22, the cover plate 21 and the vent plate 22 are arranged in parallel and at intervals, the vent plate 22 is disposed on a side of the cover plate 21 away from the first end surface, the vent plate 22 has an annular circumferential protrusion 221, the annular circumferential protrusion 221 abuts against the cover plate 21 to define a flow space together with the cover plate 21 and the vent plate 22, the cover plate 21 is connected with the push rod 31, the vent hole 312 is communicated with the flow space, the vent hole 312 is covered with a waterproof vent film (not shown) at the first end portion of the push rod 31, and the annular circumferential protrusion 221 is formed with at least one second vent hole (20). Like this, inside circulation passageway can be constituteed to ventilation shaft hole 312, circulation space and second bleeder vent 20, and this inside circulation passageway can realize the inside intercommunication with the external environment of casing when valve plate assembly 2 is located the closed position to balanced battery package's inside and outside pressure differential when battery package normal work. During waterproof ventilated membrane can prevent that external environment's moisture and other liquid from getting into the battery package through this inside circulation passageway, avoid the battery package inside to wet. In the case where the valve core mechanism includes the force application bolt 6 fixed to the second end portion, as shown in fig. 7 to 9, the force application bolt 6 may further have a third vent hole 62 communicating with the vent hole 312 to enable communication between the vent hole 312 and the inside of the battery pack.

It should be noted that, referring to fig. 4, a second sealing ring 82 may be disposed between the cover plate 21 and the valve body 1 to prevent outside rainwater and impurities from entering the interior of the housing through the gap between the cover plate 21 and the valve body 1 via the vent shaft hole 312. In addition, referring to fig. 10, the vent plate 22 is further formed with a plurality of second vents 20 at positions other than the annular circumferential protrusion 221 to increase a contact area of the flow space with the external environment, which is not limited by the present disclosure.

According to some embodiments, referring to fig. 5, the first vent 11 may have a substantially polygonal shape so as to increase the cross-sectional area or the venting area of the first vent 11 as much as possible, thereby increasing the venting rate of the explosion-proof valve, and simultaneously reducing the weight of the explosion-proof valve and increasing the capacity density of the battery pack.

In addition, as shown in fig. 5 and 6, a second limiting protrusion 313 is further formed on the outer side surface of the push rod 31, and the second limiting protrusion 313 is attached to the hole wall of the shaft hole 12, so that the push rod 31 can be prevented from shaking greatly, and the reliability of the explosion-proof valve can be improved.

According to a second aspect of the present disclosure, there is provided a battery pack including the explosion-proof valve of the battery pack as described above, thereby being capable of improving safety thereof.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. An explosion-proof valve of a battery pack, the explosion-proof valve comprising:

the valve body (1) is used for being installed on a shell of a battery pack, the valve body (1) is provided with a shaft hole (12) and a first end face and a second end face along the axial direction, the second end face is used for being in sealing fit with the outer surface of the shell of the battery pack, and the valve body (1) is provided with a plurality of first air holes (11) which are axially communicated;

a valve plate assembly (2), the valve plate assembly (2) being arranged on a first side of a first end surface of the valve body (1) and having a closed position, in which the valve plate assembly (2) is attached to the first end surface to close the first vent (11) on the first side, and a first open position, in which a spacing distance is provided between the valve plate assembly (2) and the first end surface to allow the first vent (11) to communicate with the external environment from the first side; and

a valve core mechanism comprising a push rod (31) and a locking piece (32), wherein the push rod (31) is movably arranged in the shaft hole (12) in a penetrating way and is provided with a first end part and a second end part which are opposite to each other in the axial direction, the first end part is connected to the valve plate component (2), the second end part is exposed at the second end surface, the locking piece (32) is movably arranged on the push rod (31) and can move along the axial direction relative to the valve body (1),

the locking member (32) being rotatable relative to the push rod (31) to switch between a first circumferential position relative to the push rod (31) in which the locking member (32) is at least partially located in the shaft bore (12) and a second circumferential position in which the locking member (32) is located entirely outside the shaft bore (12) and on the first side between the first end face and the valve plate assembly (2) to retain the valve plate assembly (2) in the first open position,

wherein the lock member (32) is provided with a restraining portion, a restraining engagement portion is provided in the shaft hole (12), the restraining portion cooperates with the restraining engagement portion when the lock member (32) is at the first circumferential position to restrict the lock member (32) from rotating relative to the push rod (31), and the restraining portion disengages from the restraining engagement portion when the lock member (32) is at the second circumferential position and stops the lock member (32) outside the shaft hole (12).

2. The explosion proof valve of a battery pack as claimed in claim 1, wherein the restraining portion is configured as a restraining protrusion (321), the restraining engagement portion is configured as a key groove (13) extending in the axial direction, the restraining protrusion (321) is fitted in the key groove (13) when the lock member (32) is located at the first circumferential position, the key groove (13) extends at least to the first end face so that the restraining protrusion (321) can escape therefrom to allow the lock member (32) to switch to the second circumferential position.

3. The explosion proof valve of a battery pack as recited in claim 2, characterized in that a guide structure is configured between the restraining protrusion (321) and the push rod (31), the guide structure being capable of guiding the lock member (32) to rotate toward the second circumferential position with respect to the push rod (31) when the restraining protrusion (321) is disengaged from the key groove (13).

4. Explosion-proof valve of a battery pack according to claim 3, characterized in that the locking piece (32) is configured as a ring and is fitted over the push rod (31), the restraining protrusion (321) is formed on the outer peripheral surface of the locking member (32), the outer peripheral surface of the push rod (31) is formed with a first limit protrusion (311) fitted in the key groove (13), the guide structure includes a first guide slope (41) formed at the restriction protrusion (321) and a second guide slope (42) formed at the first restriction protrusion (311), the first guide ramp (41) and the second guide ramp (42) cooperate and are configured to convert axial movement of the lockout member (32) relative to the push rod (31) into rotational movement of the lockout member (32) relative to the push rod (31), so that the blocking member (32) is switched between the first and the second circumferential position.

5. The explosion proof valve of the battery pack as recited in claim 4, wherein the locking member (32) is formed with a stopper groove (322), and when the locking member (32) is located at the second circumferential position, the first stopper protrusion (311) is partially inserted into the stopper groove (322) to keep the second guide slope (42) and the first guide slope (41) in a fitted state at all times through the stopper groove (322).

6. The explosion proof valve of the battery pack as recited in claim 4, wherein the valve core mechanism comprises an elastic thrust member (5), and the elastic thrust member (5) provides the locking member (32) with an axial elastic force pressing against the first limit projection (311).

7. The explosion proof valve of a battery pack according to any one of claims 1 to 5, wherein the valve core mechanism includes an actuating member configured to enable the lock member (32) to rotate toward the second circumferential position with respect to the push rod (31) when the lock member (32) is disengaged from the shaft hole (12).

8. The explosion proof valve of the battery pack according to claim 1, wherein the valve core mechanism comprises a pressure adjusting member (7) and a force applying bolt (6) fixed to the second end portion, one end of the pressure adjusting member (7) abuts against the second end face, and the other end abuts against the force applying bolt (6).

9. The explosion proof valve of battery pack as recited in claim 1, wherein the push rod (31) is formed with a vent shaft hole (312) penetrating the push rod (31), the valve plate assembly (2) comprises a cover plate (21) and a vent plate (22), the cover plate (21) and the vent plate (22) are arranged in parallel and at intervals, and the vent plate (22) is disposed at a side of the cover plate (21) facing away from the first end face, the vent plate (22) has an annular circumferential protrusion (221), the annular circumferential protrusion (221) abuts against the cover plate (21) to define a flow space together with the cover plate (21) and the vent plate (22), the cover plate (21) is connected with the push rod (31) and the vent shaft hole (312) is communicated with the flow space, the vent shaft hole (312) is covered with a waterproof vent film at a first end portion of the push rod (31), the annular circumferential protrusion (221) is formed with at least one second vent hole (20).

10. A battery pack comprising the explosion-proof valve of the battery pack according to any one of claims 1 to 9.