Explosion-proof valve, battery assembly and vehicle

Abstract

The invention provides an anti-explosion valve, a battery assembly and a vehicle. The anti-explosion valve comprises a valve body, a valve rod, a valve cover, a cover cap and a driving piece, the valve body comprises a vent hole, and the valve rod movably penetrates through the vent hole. The valve cover is fixed to the valve rod and used for blocking the vent hole. The cover cap is fixed to the valve body and wraps the valve rod. The driving piece is fixed to the cover cap and can drive the valve rod to move so as to drive the valve cap to control opening and closing of the vent hole. Through the arrangement, the automation degree of the anti-explosion valve is improved, the anti-explosion valve can be actively in the open state through the driving piece, and then the active protection capacity of the anti-explosion valve is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, in particular to an explosion-proof valve, a battery assembly and a vehicle. BACKGROUND

[0002] With the rapid development of the vehicle industry, new energy vehicles have a larger and larger share in the vehicle market, and the safety of the battery pack, as an important component of new energy vehicles, is crucial. Among them, the explosion-proof valve in the battery pack is a key component to ensure the safety of the battery, and its core function is to release the internal pressure in time when the battery is abnormal to prevent explosion and other dangerous situations.

[0003] However, the existing explosion-proof valve in the battery pack is generally a passive explosion-proof valve, that is, when the battery pack is abnormal, the valve is opened by the impact of high-temperature gas caused by thermal runaway, and the passive opening response time of the explosion-proof valve is too long during this process. The high-temperature gas forms a turbulent flow in the battery pack, which causes damage to the components in the battery pack. Moreover, after a short and intense exhaust of the battery cell, it will become a slow exhaust for a long time, the pressure in the battery pack decreases rapidly, and the explosion-proof valve is closed immediately. However, there is still high-temperature exhaust gas in the battery pack, which still affects the components in the battery pack.

[0004] Therefore, it is necessary to provide an improved explosion-proof valve to solve some or all of the above problems. SUMMARY

[0005] The present application provides an explosion-proof valve with active protection capability, a battery assembly and a vehicle.

[0006] The present application provides an explosion-proof valve, comprising:

[0007] a valve body, the valve body comprising a vent hole;

[0008] a valve rod, the valve rod movably penetrating the vent hole;

[0009] a valve cover, the valve cover being fixed to the valve rod, and the valve cover being used to block the vent hole;

[0010] a cover, the cover being fixed to the valve body and covering the valve rod;

[0011] a driving member, the driving member being fixed to the cover and being capable of driving the valve rod to move, so as to drive the valve cover to control the opening and closing of the vent hole.

[0012] Further, the valve body further comprises a rod connecting frame, the rod connecting frame being fixed to the inner wall of the vent hole, and the valve rod slidingly penetrating the rod connecting frame.

[0013] Further, the valve rod comprises a rod body and a baffle, the rod body is arranged in the rod holder, the valve cover is fixed to one end of the rod body, and the baffle is fixed to the other end of the rod body away from the valve cover.

[0014] Further, the elastic member is sleeved on the rod body; or

[0015] The elastic member is provided in plurality and is arranged along the circumference of the rod body.

[0016] Further, the elastic member is arranged along the axial direction of the rod body,

[0017] The driving member drives the valve rod and the valve cover to move away from and block the air hole; or

[0018] The driving member drives the valve cover to move away from the valve body to move away from the air hole, and the elastic member is compressed; or

[0019] The driving member drives the valve cover to move towards the valve body to block the air hole, and the elastic member is stretched.

[0020] Further, the driving member comprises a coil and a magnetic attraction piece arranged on the coil, the magnetic attraction piece is arranged opposite to the baffle, and the baffle is made of metal;

[0021] The coil is fixed to the cover, and is arranged on the side of the valve rod away from the valve cover, the magnetic attraction piece can attract the baffle, so that the valve cover blocks the air hole; or

[0022] The coil and the magnetic attraction piece are arranged around the rod body, the magnetic attraction piece can attract the baffle, so that the valve cover moves away from the air hole.

[0023] Further, a filter is further included, the filter is connected to the side of the valve body away from the driving member, when the valve cover moves away from the air hole, the inner cavity of the filter is communicated with the air hole.

[0024] Further, the filter comprises a shell and a filter body, the shell is fixed to the valve body;

[0025] The filter body is connected to the inner side of the shell in a sealed manner, and the shell and the filter body form the inner cavity of the filter; or

[0026] The filter body is arranged in a barrel type, the inner cavity of the filter is arranged in the filter body, and the outer side of the filter body is arranged spaced apart from the inner side of the shell.

[0027] Furthermore, the filter body includes a first filter screen, a filter element, a second filter screen and a sealing plate, and the housing includes a main housing and a support plate protruding inward from the inner side of the main housing;

[0028] The first filter is located inside the second filter, the filter element is arranged between the first filter and the second filter, the second filter is fixed to the support plate, and a gap is provided between the second filter and the inner side of the main shell, and the sealing plate is used to seal the port of the first filter away from the valve body.

[0029] Furthermore, the sealing plate includes a sealing plate body, a convex ring and a through hole. The sealing plate body is fixed on the inner side of the convex ring and is connected to the port of the first filter screen facing away from the valve body. The convex ring is clamped between the first filter screen and the second filter screen. The through hole passes through the convex ring and is arranged corresponding to the filter element.

[0030] The present application also provides a battery assembly, including a processor and the explosion-proof valve as described above, wherein the processor is electrically connected to the driving member to control the start and stop of the driving member.

[0031] The present application also provides a vehicle comprising the battery assembly as described above.

[0032] Compared with the existing technology, the explosion-proof valve of the present application is equipped with a driving member, and the driving member can drive the valve cover to move to control the opening and closing of the vent hole, thereby improving the degree of automation of the explosion-proof valve, and the driving member can make the explosion-proof valve actively open, thereby improving the active protection capability of the explosion-proof valve.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0035] Figure 1 It is a three-dimensional diagram of the explosion-proof valve of this application.

[0036] Figure 2 yes Figure 1 Side view of the explosion-proof valve.

[0037] Figure 3 yes Figure 2 Cross-sectional view of the explosion-proof valve along AA.

[0038] Figure 4 yes Figure 3 Cross-sectional view of the explosion-proof valve with the filter removed.

[0039] Figure 5 is Figure 1 isometric view of a valve body in an explosion-proof valve.

[0040] Figure 6 is Figure 3 isometric view of an explosion-proof valve.

[0041] Figure 7 is Figure 3 side view of an explosion-proof valve in an open state.

[0042] Figure 8 is Figure 7 isometric view of an explosion-proof valve in an open state.

[0043] Figure 9 is Figure 1 isometric view of a filter element in an explosion-proof valve.

[0044] Figure 10 is Figure 9 cross-sectional view of a filter element along B-B in an explosion-proof valve.

[0045] BRIEF DESCRIPTION OF THE DRAWINGS: 1 - valve body; 11 - vent hole; 12 - rod connecting bracket; 121 - mounting hole; 2 - valve rod; 21 - rod main body; 211 - sliding rod part; 212 - limiting part; 22 - baffle; 3 - valve cover; 4 - cover; 41 - air hole; 5 - driving element; 51 - coil; 52 - magnetic attraction piece; 6 - elastic element; 7 - filter element; 70 - inner cavity; 71 - shell; 711 - main shell; 712 - support plate; 713 - protection plate; 72 - filter body; 721 - first filter screen; 722 - filter core; 723 - second filter screen; 724 - sealing plate; 7241 - sealing plate body; 7242 - protruding ring; 7243 - through hole. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments (or, “modes of implementation”) of the present application will be described clearly and completely below with reference to the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0047] If the application embodiments involve directional indications or positional relationships (such as up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships, movement conditions, etc. between components in a certain specific posture (as shown in the drawings); if the specific posture changes, the directional indications or positional relationships also change accordingly. In addition, the terms “first”, “second”, etc. in the application embodiments are only used for convenience of description, and cannot be understood as indicating or implying relative importance.

[0048] like Figures 1 to 5 As shown, the explosion-proof valve of the present application includes a valve body 1, a valve stem 2, a valve cover 3, a cover 4 and a driving member 5. The valve body 1 includes an air vent 11, and the valve stem 2 is movably provided in the air vent 11. The valve cover 3 is fixed to the valve stem 2, and the valve cover 3 is used to block the air vent 11. The cover 4 is fixed to the valve body 1 and covers the valve stem 2. The driving member 5 is fixed to the cover 4, and can drive the valve stem 2 to move, so as to drive the valve cover 3 to control the opening and closing of the air vent 11. Such a setting improves the degree of automation of the explosion-proof valve, and the explosion-proof valve can be actively in an open state through the driving member 5, thereby improving the active protection capability of the explosion-proof valve.

[0049] In some embodiments, along the axial direction of the valve stem 2, the vent hole 11 passes through the valve body 1, and the valve stem 2 can slide relative to the valve body 1. The valve body 1 may further include a rod connecting frame 12, which is fixed to the inner wall of the vent hole 11, and the valve stem 2 is slidably inserted into the rod connecting frame 12. The rod connecting frame 12 includes a mounting hole 121, through which the valve stem 2 passes, and the valve stem 2 can contact the rod connecting frame 12 to limit the position of the valve stem 2. Specifically, the valve stem 2 includes a rod body 21 and a baffle 22. The rod body 21 passes through the rod connecting frame 12, the valve cover 3 is fixed to one end of the rod body 21, and the baffle 22 is provided at the end of the rod body 21 facing away from the valve cover 3.

[0050] The rod body 21 includes a sliding rod portion 211 and a limiting portion 212. The sliding rod portion 211 slides through the mounting hole 121, and one end of the sliding rod portion 211 is connected to the valve cover 3. The limiting portion 212 is located at the other end of the sliding rod portion 211, and its diameter is larger than that of the sliding rod portion 211. When the valve stem 2 slides, the limiting portion 212 can contact the rod connecting frame 12. The baffle 22 is fixed to the end of the limiting portion 212 facing away from the sliding rod portion 211. The outer diameter of the baffle 22 is larger than the diameter of the limiting portion 212, and the baffle 22 is made of metal.

[0051] The valve cap 3 moves with the valve stem 2 to block and deflect the vent 11. The cover 4 is fixed to the side of the valve body 1 facing away from the valve cap 3 and serves to protect the valve stem 2 and the actuator 5. An air hole 41 is provided at the end of the cover 4 connected to the valve body 1. This air hole 41 mates with the vent 11 to allow external air to pass through the valve body 1 quickly and smoothly.

[0052] The driving member 5 is preferably, but not limited to, an electromagnetic coil. The driving member 5 includes a coil 51 and a magnetic sheet 52 disposed on the coil 51. The magnetic sheet 52 is disposed opposite the baffle 22 and is used to drive the baffle 22. Specifically, when the magnetic sheet 52 needs to drive the baffle 22, the coil 51 is energized, causing the magnetic sheet 52 to acquire magnetism and thereby attract the baffle 22.

[0053] In some embodiments, the coil 51 is fixed to the cover 4, and along the axial direction of the valve stem 2, the coil 51 is located on the side of the valve stem 2 away from the valve cover 3. The magnetic sheet 52 can attract the baffle 22, so that the valve cover 3 blocks the vent hole 11. While the explosion-proof valve is in the open state, the magnetic sheet 52 is spaced apart from the baffle 22.

[0054] In other embodiments, the coil 51 and the magnetic sheet 52 are arranged around the stem body 21, and the magnetic sheet 52 is located on the side of the baffle 22 facing the valve cover 3. The magnetic sheet 52 can attract the baffle 22, so that the valve cover 3 moves away from the vent hole 11. While the explosion-proof valve is in the closed state, the magnetic sheet 52 is spaced apart from the baffle 22.

[0055] In other embodiments, the driving member 5 can also be a gas cylinder assembly, a hydraulic cylinder assembly, etc., which will not be described herein.

[0056] Further combined Figures 6 to 8 As shown, in some embodiments, the explosion-proof valve can further include an elastic member 6, and the two ends of the elastic member 6 are connected to the stem bracket 12 and the baffle 22, respectively. The elastic member 6 can provide an elastic force to the valve stem 2 to assist the movement of the valve stem 2. The elastic member 6 is preferably but not limited to a spring. The elastic member 6 is arranged in one and sleeved on the stem body 21. In this way, the installation efficiency of the explosion-proof valve is improved.

[0057] In other embodiments, the elastic member 6 is arranged in multiple, and along the circumferential direction of the stem body 21, the multiple elastic members 6 are arranged spaced apart around the circumferential side of the stem body 21. In this way, the manufacturing cost of the explosion-proof valve is reduced.

[0058] In some embodiments, along the axial direction of the stem body 21, the driving member 5 drives the valve cover 3 to move away from the vent hole 11. Specifically, when the explosion-proof valve switches between the open state and the closed state, the valve stem 2 and the valve cover 3 are only driven by the driving member 5, so that the elastic member 6 can be omitted, thereby further reducing the manufacturing cost of the explosion-proof valve.

[0059] In other embodiments, along the axial direction of the stem body 21, the driving member 5 drives the valve cover 3 to move away from the valve body 1, so that the valve cover 3 moves away from the vent hole 11, and at this time the elastic member 6 is compressed. In this embodiment, when the explosion-proof valve switches to the closed state, the elastic force of the elastic member 6 can drive the valve cover 3 to block the vent hole 11, and in this process, only the driving member 5 needs to be closed or assisted by the driving member 5, thereby reducing the working load of the driving member 5.

[0060] In some other embodiments, the driving member 5 drives the valve cover 3 to move along the axial direction of the rod body 21 towards the valve body 1 to block the vent hole 11, and the elastic member 6 is stretched. In this embodiment, when the explosion-proof valve is switched to the open state, the elastic force of the elastic member 6 can drive the valve cover 3 to move away from the vent hole 11, and in this process, only the driving member 5 needs to be closed or the driving member 5 needs to be assisted, thereby reducing the working load of the driving member 5.

[0061] Further combining Figure 9 and Figure 10 As shown in FIGS. 7 and 8, in some embodiments, the explosion-proof valve can further include a filter 7, wherein the filter 7 is connected to the side of the valve body 1 away from the driving member 5. When the valve cover 3 moves away from the vent hole 11, the inner cavity 70 of the filter 7 communicates with the vent hole 11. The filter 7 includes a shell 71 and a filter body 72, the shell 71 is fixed to the valve body 1, and the filter body 72 is connected to the shell 71. The gas flowing out of the vent hole 11 flows through the filter body 72 and is discharged from the explosion-proof valve through the shell 71.

[0062] The filter body 72 is in the shape of a round cake, and the filter body 72 is tightly connected to the inner side of the shell 71. The shell 71 and the filter body 72 form the inner cavity 70 of the filter 7.

[0063] In some other embodiments, the filter body 72 is in the shape of a barrel, and the inner cavity 70 of the filter 7 is arranged in the filter body 72. The outer side of the filter body 72 is arranged in a spaced manner with the inner side of the shell 71 to facilitate the exhaust of the explosion-proof valve. In this embodiment, the filter 7 will be described in detail as follows.

[0064] The shell 71 includes a main shell 711 and a support plate 712 protruding inwardly from the inner side of the main shell 711, and the filter body 72 includes a first filter screen 721, a filter core 722, a second filter screen 723, and a sealing plate 724. The first filter screen 721, the filter core 722, and the second filter screen 723 are all in the shape of a cylinder, the first filter screen 721 is located inside the second filter screen 723, and the filter core 722 is arranged between the first filter screen 721 and the second filter screen 723. The second filter screen 723 is fixed to the support plate 712 and has a gap between the inner side of the main shell 711. The sealing plate 724 is connected to the first filter screen 721 and / or the second filter screen 723 and is used to block the port of the first filter screen 721 away from the valve body 1. The sealing plate 724 and the first filter screen 721 form the inner cavity 70 of the filter 7.

[0065] The sealing plate 724 comprises a sealing plate body 7241, a convex ring 7242 and a through hole 7243. The sealing plate body 7241 is fixed inside the convex ring 7242 and connected to the end of the first filter screen 721 away from the valve body 1. The thickness of the convex ring 7242 is greater than that of the sealing plate body 7241. The convex ring 7242 is clamped between the first filter screen 721 and the second filter screen 723. The through hole 7243 penetrates the convex ring 7242 and is correspondingly arranged with the filter element 722. When the gas flowing out of the vent hole 11 flows through the filter body 72, the gas can flow out of the second filter screen 723 and the through hole 7243.

[0066] The shell 71 can further comprise a protective plate 713 connected to the main shell 711 away from the port of the valve body 1. When the explosion-proof valve is transported or stored, the protective plate 713 is used to prevent impurities from entering the filter 7. When the explosion-proof valve is used for the first time, the protective plate 713 can be separated from the main shell 711 under the action of gas pressure, so that the gas can be smoothly discharged from the filter 7.

[0067] The application also provides a battery assembly comprising a processor and an explosion-proof valve as described above. The processor is electrically connected to the driving member 5 to control the start and stop of the driving member 5. The battery assembly of the application sets the explosion-proof valve. When the detection device of the battery assembly detects abnormal data such as temperature, voltage, current and air pressure, it is judged that there is a risk of thermal runaway. The processor can automatically control the driving member 5 to move the valve cover 3 to make the explosion-proof valve open in time, and then discharge the high-temperature gas in the battery assembly.

[0068] In this way, the self-protection ability of the explosion-proof valve and the battery assembly is improved to avoid the formation of turbulent flow of high-temperature gas in the battery assembly, reducing the damage degree of components. Moreover, the processor controls the driving member 5, which can make the explosion-proof valve open for a long time, so that the high-temperature exhaust gas is discharged as clean as possible. At the same time, the filter 7 can filter solid particles and harmful gases in the high-temperature gas, reducing the pollution to the environment.

[0069] When the detection device of the battery assembly detects that the air pressure in the bag returns to normal, the processor can automatically control the driving member 5 to move the valve cover 3 towards the vent hole 11 or the processor controls the driving member 5 to close, and the valve cover 3 is driven by the elastic force of the elastic member 6 to move towards the vent hole 11, so that the explosion-proof valve is in a closed state. It is worth noting that the movement of the valve cover 3 controlled by the driving member 5 and the movement of the valve cover 3 controlled by the elastic member 6 do not affect each other. When the battery assembly has a risk of thermal runaway, there are the above two protection measures. Among them, the processor controls the driving member 5 to make the explosion-proof valve open or close, which is the main protection measure. When the processor or the driving member 5 fails, the valve can still be opened by the impact of the high-temperature gas of thermal runaway.

[0070] The application also provides a vehicle comprising a battery assembly as described above.

[0071] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structures described in the above embodiments and shown in the drawings; any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. An explosion-proof valve, characterized in that: include: a valve body, the valve body including a vent; a valve stem, wherein the valve stem is movably provided with the vent hole; a valve cover fixed to the valve stem, and the valve cover can be used to block the vent hole; a cover, the cover being fixed to the valve body and covering the valve stem; A driving member is fixed to the cover and can drive the valve stem to move, so as to drive the valve cover to control the opening and closing of the vent hole.

2. The explosion-proof valve according to claim 1, characterized in that: The valve body further comprises a rod connecting frame, the rod connecting frame is fixed to the inner wall of the vent hole, and the valve stem is slidably arranged through the rod connecting frame.

3. The explosion-proof valve according to claim 2, characterized in that: It also includes an elastic member, the valve stem includes a rod body and a baffle, the rod body is inserted into the rod connecting frame, the valve cover is fixed to one end of the rod body, the baffle is fixed to the end of the rod body away from the valve cover, and the two ends of the elastic member are respectively connected to the rod connecting frame and the baffle.

4. The explosion-proof valve according to claim 3, characterized in that: The elastic member is sleeved on the rod body; or A plurality of elastic members are provided, and along the circumferential direction of the rod body, the plurality of elastic members are arranged at intervals around the circumference of the rod body.

5. The explosion-proof valve according to claim 3, characterized in that: Along the axial direction of the rod body, The driving member drives the valve stem and the valve cover to move so as to move away from and block the vent hole; or The driving member drives the valve cover to move in a direction away from the valve body to move away from the vent hole, and the elastic member is compressed; or The driving member drives the valve cover to move in a direction toward the valve body to block the vent hole, and the elastic member is stretched.

6. The explosion-proof valve according to claim 5, characterized in that: The driving member includes a coil and a magnetic sheet provided on the coil, wherein the magnetic sheet is arranged opposite to the baffle, and the baffle is made of metal; The coil is fixed to the cover and is located on a side of the valve stem facing away from the valve cover, and the magnetic sheet can absorb the baffle so that the valve cover blocks the vent; or The coil and the magnetic sheet are arranged around the rod body, and the magnetic sheet can absorb the baffle to move the valve cover away from the vent hole.

7. The explosion-proof valve according to claim 1, characterized in that: It also includes a filter element connected to the side of the valve body facing away from the driving element. When the valve cover moves away from the vent hole, the inner cavity of the filter element is communicated with the vent hole.

8. The explosion-proof valve according to claim 7, characterized in that: The filter element includes a shell and a filter body, and the shell is fixed to the valve body; The filter body is tightly connected to the inner side of the shell, and the shell and the filter body form an inner cavity of the filter element; or The filter body is arranged in a barrel shape, the inner cavity of the filter element is arranged in the filter body, and the outer side of the filter body is spaced apart from the inner side of the shell.

9. The explosion-proof valve according to claim 8, characterized in that: The filter body includes a first filter screen, a filter element, a second filter screen and a sealing plate, and the housing includes a main housing and a support plate protruding inward from the inner side of the main housing; The first filter is located inside the second filter, the filter element is arranged between the first filter and the second filter, the second filter is fixed to the support plate, and a gap is provided between the second filter and the inner side of the main shell, and the sealing plate is used to seal the port of the first filter away from the valve body.

10. The explosion-proof valve according to claim 9, characterized in that: The sealing plate includes a sealing plate body, a convex ring and a through hole. The sealing plate body is fixed to the inner side of the convex ring and is connected to the port of the first filter screen facing away from the valve body. The convex ring is clamped between the first filter screen and the second filter screen. The through hole passes through the convex ring and is arranged corresponding to the filter element.

11. A battery assembly, characterized in that: The explosion-proof valve comprises a processor and any one of claims 1 to 10, wherein the processor is electrically connected to the driving member to control the start and stop of the driving member.

12. A vehicle, characterized in that: Comprising the battery assembly as claimed in claim 11.

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