Explosion-proof valve and battery pack

Abstract

The utility model provides an anti-explosion valve and a battery pack. The anti-explosion valve comprises a valve body with a channel, a fire filtering net arranged at one end of the channel, and a top cover structure arranged at the other end of the channel, the top cover structure comprises a top cover body, a blocking plate arranged on the inner side of the top cover body, a first elastic piece and a second elastic piece, the first elastic piece and the second elastic piece are arranged between the blocking plate and the top cover body, one end of the top cover body is rotationally arranged on the valve body, the other end of the top cover body is connected to the valve body in a clamped mode, and the blocking plate is extruded to the valve body through the first elastic piece. The plug plate is pushed by pressure gas in the channel, can act relative to the valve body and enables the second elastic piece to release energy, and under the pushing of the released energy of the second elastic piece, the top cover body is not connected with the valve body in a clamped mode, and the channel is opened. According to the explosion-proof valve disclosed by the utility model, through the arrangement of the top cover body, the blocking plate, the first elastic piece and the second elastic piece in the top cover structure, the reliability of the top cover structure is favorably improved, and the discharge of gas is also facilitated, so that the safety of a battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to an explosion-proof valve. At the same time, the utility model also relates to a battery pack provided with the explosion-proof valve. Background Art

[0002] With the popularization of power battery packs, people pay more and more attention to the safety of battery packs. As a key component affecting the safety of battery packs, there are two main ways of explosion of explosion-proof valves: the first is the puncture of the explosion-proof membrane by a pin, and the second is the spring push rod explosion. These two types of explosion-proof valves have poor reliability when the battery pack is in thermal runaway, which is not conducive to timely discharge of gas in the battery, thus affecting the safety of the battery pack. Utility Model Content

[0003] In view of this, the utility model aims to provide an explosion-proof valve to improve reliability and exhaust effect.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] An explosion-proof valve comprises a valve body having a channel, a fire filter arranged at one end of the channel, and a top cover structure arranged at the other end of the channel;

[0006] The top cover structure includes a top cover body arranged at the other end of the channel, a blocking plate arranged inside the top cover body, and a first elastic member and a second elastic member arranged between the blocking plate and the top cover body. One end of the top cover body is rotatably arranged on the valve body, and the other end is clamped on the valve body, and the blocking plate is pressed onto the valve body through the first elastic member.

[0007] The blocking plate is pushed by the pressurized gas in the channel, can move relative to the valve body, and release energy of the second elastic member, and under the energy release and pushing of the second elastic member, the top cover body releases the clamping connection with the valve body and opens the channel.

[0008] Furthermore, a third elastic member is provided on the rotating shaft of the top cover body, and the third elastic member is used to drive the top cover body to flip open after the clamping is released.

[0009] Furthermore, the blocking plate includes a blocking plate body, and a protrusion provided on the blocking plate body along the thickness direction of the blocking plate body;

[0010] The first elastic member is arranged between the protrusion and the top cover body along the axial direction of the channel.

[0011] Furthermore, the top cover body is provided with a clamping block for clamping with the valve body, and the clamping block is provided with a push rod, and the push rod extends in the radial direction of the top cover body;

[0012] The protrusion is provided with a radially outwardly protruding plug post, and the second elastic member is a spring sleeved outside the plug post and the push rod.

[0013] Furthermore, a moisture absorbing layer capable of absorbing moisture is provided on the inner wall of the channel.

[0014] Furthermore, the valve body comprises a valve body provided with the passage, and a sealing sleeve sleeved on the outside of the valve body;

[0015] The fire filter is arranged on the sealing sleeve.

[0016] Furthermore, a limiting piece is provided at one end of the sealing sleeve, and the limiting piece protrudes inwardly along the radial direction of the sealing sleeve;

[0017] The fire filter is arranged on the limit plate and is sandwiched between the limit plate and the valve body.

[0018] Furthermore, the outer circumferential surfaces of the valve body and the sealing sleeve are provided with external threads; and / or,

[0019] The sealing sleeve is provided with an internal thread and is threadedly connected to the valve body through the internal thread.

[0020] Furthermore, the top cover structure and / or the valve body are made of metal.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] The explosion-proof valve described in the utility model is rotatably arranged on the valve body by one end of the top cover body, and is clamped on the valve body by the other end, and the plugging plate is squeezed onto the valve body by the first elastic member, which is beneficial to improving the reliability of the top cover structure, and the plugging plate is pushed by pressurized gas so that the plugging plate can move relative to the valve body, and under the energy release and pushing of the second elastic member, the top cover body releases the clamping connection with the valve body and opens the channel, which is beneficial to the discharge of gas, thereby improving the safety of the battery pack.

[0023] In addition, a third elastic member is provided on the rotating shaft of the top cover body, which is conducive to driving the top cover body to flip open after the clamping is released, thereby facilitating the gas discharge efficiency. The provision of a protrusion on the blocking plate is conducive to the arrangement of the first elastic member, thereby facilitating the release of the clamping connection between the top cover body and the valve body. The provision of the clamping block facilitates the clamping connection between the top cover body and the valve body; the provision of the protrusion and the push rod facilitates the arrangement of the second elastic member, and has the advantages of simple structure and easy arrangement and implementation. A sealing sleeve is provided outside the valve body, which is conducive to improving the installation effect of the valve body.

[0024] In addition, the setting of the upper limit plate on the sealing sleeve is not only conducive to the installation of the fire filter, but also conducive to the replacement of the fire filter. The setting of the hygroscopic layer can absorb water vapor in the battery pack to prevent the formation of condensation and cause insulation failure of the battery pack. External threads are set on the outer peripheral surfaces of the valve body and the sealing sleeve, which is conducive to the screw installation of the valve body and has good installation convenience and reliability; internal threads are set in the sealing sleeve, which is conducive to improving the installation reliability of the sealing sleeve on the valve body. The top cover structure and the valve body are made of metal and have good durability.

[0025] In addition, another object of the present invention is to provide a battery pack, on which the explosion-proof valve as described above is provided.

[0026] The battery pack of the utility model is provided with the above explosion-proof valve, which is beneficial to improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0028] Figure 1 This is an exploded diagram of the explosion-proof valve described in the embodiment of the utility model;

[0029] Figure 2 This is a schematic structural diagram of the explosion-proof valve according to an embodiment of the utility model at one viewing angle;

[0030] Figure 3 This is a schematic structural diagram of the explosion-proof valve according to an embodiment of the utility model from another perspective;

[0031] Figure 4 This is a schematic diagram of the internal structure of the explosion-proof valve according to an embodiment of the utility model from one viewing angle;

[0032] Figure 5 This is a schematic diagram of the internal structure of the explosion-proof valve described in an embodiment of the utility model from another perspective.

[0033] Description of reference numerals:

[0034] 1. Top cover structure; 2. Valve body;

[0035] 100, channel; 101, top cover body; 1011, through hole; 102, blocking plate; 1021, blocking plate body; 1022, protrusion; 1023, third elastic member; 1024, second elastic member; 1025, block; 1026, push rod; 1027, plug column; 1028, limit plate; 103, sealing ring; 104, first elastic member;

[0036] 201, valve body; 2011, hook; 2012, mounting block; 2013, mounting hole; 202, sealing sleeve; 2021, insertion port; 2022, limit plate; 203, moisture absorption layer; 204, fire filter. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0041] This embodiment relates to an explosion-proof valve. In terms of overall structure, the explosion-proof valve includes a valve body 2 having a channel 100 , a fire filter 204 arranged at one end of the channel 100 , and a top cover structure 1 arranged at the other end of the channel 100 .

[0042] Among them, the top cover structure 1 includes a top cover body 101 arranged at the other end of the channel 100, a blocking plate 102 arranged on the inner side of the top cover body 101, and a first elastic member 104 and a second elastic member 1024 arranged between the blocking plate 102 and the top cover body 101. One end of the top cover body 101 is rotatably arranged on the valve body 2, and the other end is clamped on the valve body 2, and the blocking plate 102 is squeezed onto the valve body 2 through the first elastic member 104.

[0043] The blocking plate 102 is pushed by the pressurized gas in the channel 100 and can move relative to the valve body 2, and release the energy of the second elastic member 1024. Under the energy release and pushing of the second elastic member 1024, the top cover body 101 is released from the clamping connection with the valve body 2, and the channel 100 is opened.

[0044] The explosion-proof valve of this embodiment is rotatably arranged on the valve body 2 by one end of the top cover body 101, and is clamped on the valve body 2 at the other end, and the plugging plate 102 is squeezed onto the valve body 2 by the first elastic member 104, which is beneficial to improving the reliability of the top cover structure 1, and the plugging plate 102 is pushed by pressurized gas, so that the plugging plate 102 can move relative to the valve body 2, and under the energy release and pushing of the second elastic member 1024, the top cover body 101 is released from the clamping connection with the valve body 2 and the channel 100 is opened, which is beneficial to the discharge of gas, thereby improving the safety of the battery pack.

[0045] Based on the above overall introduction, an exemplary structure of the explosion-proof valve in this embodiment is as follows: Figures 1 to 5 As shown in . As a preferred embodiment, in order to facilitate the installation of the top cover structure 1, a mounting block 2012 and a hook 2011 are respectively arranged at the other end of the valve body 2 relative to one end where the fire filter 204 is arranged. One end of the top cover body 101 is rotatably arranged on the mounting block 2012, and the hook 2011 is used to clamp the top cover body 101. Among them, the mounting block 2012 is provided with a circular arc-shaped mounting hole 2013, and the top cover body 101 is rotatably arranged in the mounting hole 2013 through a rotating shaft, so as to guide the top cover body 101 to flip upward relative to the valve body 2, thereby facilitating the release of the clamping connection between the valve body 2 and the top cover body 101.

[0046] As a preferred embodiment, the blocking plate 102 includes a blocking plate body 1021 and a protrusion 1022 disposed on the blocking plate body 1021 along the thickness direction of the blocking plate body 1021. The first elastic member 104 is disposed between the protrusion 1022 and the top cover body 101 along the axial direction of the channel 100. Figure 4 As shown in , the first elastic member 104 is a first spring sleeved on the protrusion 1022, and the top end of the first spring abuts against the inner side of the top cover body 101. Here, the first elastic member 104 has a simple structure, which is conducive to improving the stability of the blocking plate 102 in the upward sliding, thereby helping to improve the reliability of the explosion-proof valve.

[0047] The top cover body 101 is provided with a block 1025 for engaging with the valve body 2, and a push rod 1026 is provided on the block 1025, and the push rod 1026 extends radially along the top cover body 101. The protrusion 1022 is provided with a radially outwardly protruding plug 1027, and the second elastic member 1024 is a spring sleeved outside the plug 1027 and the push rod 1026. Figure 1 , Figure 4 as well as Figure 5As shown in the figure, the block 1025 is used to be connected with the hook 2011 for easy installation of the block 1025. A through hole 1011 is provided on the outer periphery of the top cover body 101, and the block 1025 is slidably arranged in the through hole 1011 along the radial direction of the top cover body 101. When the block 1025 and the hook 2011 are in a clamping state, the upward movement of the top cover body 101 can be restricted, thereby facilitating the improvement of the reliability of the top cover structure 1.

[0048] To prevent the components from separating after being triggered, two ends of the first elastic member 104 are fixedly connected to the top cover body 101 and the blocking plate 102 , respectively, and two ends of the second elastic member 1024 are fixedly connected to the protrusion 1022 and the clamping block 1025 , respectively.

[0049] In this embodiment, Figure 4 As shown in , the plug post 1027 is arranged toward the block 1025, and the push rod 1026 is arranged on the block 1025 corresponding to the plug post 1027. For the convenience of distinguishing descriptions, the spring sleeved outside the plug post 1027 and the push rod 1026 is called the second spring. When the block 1025 and the hook 2011 are in a clamping state, the second spring is in an elastic compression state. Such a setting is conducive to releasing the clamping of the block 1025 and the hook 2011, thereby facilitating the discharge of gas in the channel 100. In order to improve the stability of the second spring during expansion and contraction, two limit plates 1028 located on both sides of the second spring are also provided on the block 1025. The limit plates 1028 are conducive to guiding the second spring to expand and contract only along its own length direction, thereby improving the stability of the block 1025 and the hook 2011 during the process of releasing the clamping connection.

[0050] Furthermore, a third elastic member 1023 is provided on the rotating shaft of the top cover body 101, and the third elastic member 1023 is used to drive the top cover body 101 to flip open after the clamping is released. Figure 1 and Figure 4 As shown in , the third elastic member 1023 is a torsion spring or a rotary spring sleeved on the rotating shaft. One end of the torsion spring abuts against the mounting block 2012, and the other end abuts against the top cover body 101. When the clamping block 1025 and the hook 2011 are in a clamping state, the torsion spring is compressed and stores energy, which is conducive to the clamping block 1025 and the hook 2011 being released from the clamping state, and the torsion spring drives the top cover body 101 to flip upward, so that the blocking plate 102 releases the blocking of the channel 100, and the gas in the channel 100 can be discharged in time.

[0051] In addition, refer to Figure 4As shown in , a sealing ring 103 is provided between the end face of the valve body 2 and the plugging plate body 1021, which is conducive to improving the blocking of the plugging plate 102 to the channel 100, thereby improving the reliability of the explosion-proof valve. The top cover structure 1 in this embodiment is made of metal to further improve the high temperature resistance, its own structural strength and reliability. A hygroscopic layer 203 capable of absorbing moisture is provided on the inner wall of the channel 100. The hygroscopic layer 203 can absorb water vapor in the battery pack to prevent the formation of condensation and cause insulation failure of the battery pack.

[0052] In specific implementation, the hygroscopic layer 203 can be made of hygroscopic materials in the prior art, which has a good water absorption effect. Preferably, the hygroscopic layer 203 can be a hygroscopic film with a hygroscopic effect in the prior art, which is cylindrical in shape and bonded to the inner wall of the valve body 2. This is conducive to increasing the adsorption area of ​​water vapor without affecting the explosion of the explosion-proof valve, thereby improving the safety of the battery pack.

[0053] When the explosion-proof valve in this embodiment is in a closed state, Figure 4 and Figure 5 As shown in , when the block 1025 and the hook 2011 are in a locked state, the plugging plate body 1021 is restricted between the mounting block 2012 and the hook 2011, and the second spring is in a compressed state. When the pressure of the gas flowing into the channel 100 increases to the target pressure, the gas can push the plugging plate body 1021 outward, so that the plugging plate body 1021 moves outward along the axial direction of the valve body 2 and compresses the first spring.

[0054] When the blocking plate body 1021 moves to the top of the hook 2011, the hook 2011 and the mounting block 2012 release the constraint on the blocking plate body 1021, and the block 1025 slides outward under the action of the second spring releasing the stored energy. At this time, the block 1025 and the hook 2011 are released from the engagement, and under the action of the torsion spring, the top cover body 101 flips upward, thereby completely releasing the blocking of the channel 100 by the blocking plate body 1021, and the channel 100 discharges the gas to achieve a pressure relief effect, thereby improving the safety of the battery pack.

[0055] In this embodiment, the top cover body 101 can be buckled onto the valve body 2 so that the hook 2011 is engaged with the block 1025, thereby realizing the reset of the top cover structure 1, so that the blocking plate body 1021 blocks the channel 100 again. Figure 1 and Figure 4 , Figure 5As shown in , the valve body 2 includes a valve body 201 provided with a channel 100, and a sealing sleeve 202 sleeved on the outside of the valve body 201, and a fire filter 204 is arranged on the sealing sleeve 202. The valve body 201 and the sealing sleeve 202 are both cylindrical, so as to facilitate the formation of the above-mentioned channel 100 inside themselves, and facilitate the sealing sleeve 202 to be arranged at the bottom of the valve body 201. The above-mentioned hook 2011 and the mounting block 2012 are both arranged on the valve body 201.

[0056] In order to facilitate the installation of the valve body 2, the outer circumferential surfaces of the valve body 201 and the sealing sleeve 202 are provided with external threads. This arrangement facilitates the valve body 2 to be screwed onto the battery pack housing, which has the advantage of convenient installation. As a preferred embodiment, the sealing sleeve 202 is provided with internal threads, and is screwed onto the valve body 201 via the internal threads. Figure 4 and Figure 5 As shown in the figure, the sealing sleeve 202 is screwed to the bottom of the valve body 201, which is convenient for installation and disassembly of the explosion-proof valve on the battery pack shell. After the sealing sleeve 202 is compressed in contact with the metal, the friction force is relatively large, which effectively prevents the explosion-proof valve torque from attenuating, while meeting the airtight requirements of the battery pack, which is beneficial to improving the safety of the battery pack.

[0057] In this embodiment, a limiting piece 2022 is provided at one end of the sealing sleeve 202, and the limiting piece 2022 protrudes inwardly along the radial direction of the sealing sleeve 202. The fire filter 204 is provided on the limiting piece 2022 and sandwiched between the limiting piece 2022 and the valve body 201. Figure 1 and Figure 4 As shown in , the limiting piece 2022 is arranged at one end of the sealing sleeve 202 away from the top cover structure 1. A through hole 1011 is formed in the middle of the limiting piece 2022 to ensure the connection between the channel 100 and the battery pack shell. Here, the limiting piece 2022 can be integrally processed and formed with the sealing sleeve 202 to improve the use effect of the sealing sleeve 202, and the limiting piece 2022 has a simple structure and is easy to form.

[0058] To facilitate the installation of the fire filter 204 on the limiting piece 2022, Figure 1 As shown in , an insertion port 2021 is provided on the outer periphery of the bottom of the sealing sleeve 202, and the fire filter 204 is inserted into the sealing sleeve 202 through the insertion port 2021 and is located on the limiting piece 2022. Of course, the insertion port 2021 may not be provided on the sealing sleeve 202. In this case, the fire filter 204 needs to be first installed into the bottom of the sealing sleeve 202, that is, on the limiting piece 2022, and then fixed between the valve body 201 and the limiting piece 2022 as the sealing sleeve 202 is installed on the valve body 201.

[0059] In this embodiment, the sealing sleeve 202 and the limiting plate 2022 cooperate to wrap the bottom part of the valve body 201, and at the same time facilitate the installation and replacement of the fire filter 204, eliminating the gluing and welding process, helping to reduce production costs, and having a better use effect.

[0060] In this embodiment, the connection between the sealing sleeve 202 and the valve body 201, and the connection between the fire filter 204 and the sealing sleeve 202, when the battery pack has thermal runaway, only the damaged sealing sleeve 202 and the fire filter 204 covered with molten material need to be replaced, and the other parts can be cleaned and reassembled for reuse, saving raw materials and reducing maintenance costs. In addition, the valve body 201 in this embodiment is preferably made of metal to have better high temperature resistance, longer service life and safety.

[0061] In addition, the present embodiment also relates to a battery pack, on which the explosion-proof valve as described above is provided.

[0062] The battery pack of this embodiment is provided with the above explosion-proof valve, which helps to improve the safety of the battery pack.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof valve, characterized in that: It comprises a valve body having a channel, a fire filter arranged at one end of the channel, and a top cover structure arranged at the other end of the channel; The top cover structure includes a top cover body arranged at the other end of the channel, a blocking plate arranged inside the top cover body, and a first elastic member and a second elastic member arranged between the blocking plate and the top cover body. One end of the top cover body is rotatably arranged on the valve body, and the other end is clamped on the valve body, and the blocking plate is pressed onto the valve body through the first elastic member. The blocking plate is pushed by the pressurized gas in the channel, can move relative to the valve body, and release energy of the second elastic member, and under the energy release and pushing of the second elastic member, the top cover body releases the clamping connection with the valve body and opens the channel.

2. The explosion-proof valve according to claim 1, characterized in that: A third elastic member is disposed on the rotating shaft of the top cover body, and the third elastic member is used to drive the top cover body to flip open after the clamping is released.

3. The explosion-proof valve according to claim 1, characterized in that: The blocking plate includes a blocking plate body and a protrusion arranged on the blocking plate body along the thickness direction of the blocking plate body; The first elastic member is arranged between the protrusion and the top cover body along the axial direction of the channel.

4. The explosion-proof valve according to claim 3, characterized in that: The top cover body is provided with a clamping block for clamping with the valve body, and the clamping block is provided with a push rod, and the push rod extends along the radial direction of the top cover body; The protrusion is provided with a radially outwardly protruding plug post, and the second elastic member is a spring sleeved outside the plug post and the push rod.

5. The explosion-proof valve according to claim 1, characterized in that: A moisture absorbing layer capable of absorbing moisture is arranged on the inner wall of the channel.

6. The explosion-proof valve according to any one of claims 1 to 5, characterized in that: The valve body comprises a valve body provided with the passage, and a sealing sleeve sleeved on the outside of the valve body; The fire filter is arranged on the sealing sleeve.

7. The explosion-proof valve according to claim 6, characterized in that: A limiting piece is provided at one end of the sealing sleeve, and the limiting piece protrudes inwardly along the radial direction of the sealing sleeve; The fire filter is arranged on the limit plate and is sandwiched between the limit plate and the valve body.

8. The explosion-proof valve according to claim 6, characterized in that: The outer circumferential surfaces of the valve body and the sealing sleeve are provided with external threads; and / or, The sealing sleeve is provided with an internal thread and is threadedly connected to the valve body through the internal thread.

9. The explosion-proof valve according to claim 6, characterized in that: The top cover structure and / or the valve body are made of metal.

10. A battery pack, characterized in that: The battery pack is provided with an explosion-proof valve as claimed in any one of claims 1 to 9.

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