An explosion-proof pressure relief valve and a battery pack assembly

Abstract

The present invention discloses an explosion-proof pressure relief valve and a battery pack assembly, which relate to the field of new energy technology, and specifically include: a valve body, which is provided with a stepped through hole inside; a valve core, which includes a guide rod in the form of a stepped shaft, the small diameter portion of the guide rod and the small diameter portion of the stepped through hole are slidably mounted, and the two are provided with elastic parts along the relative sliding direction; the guide rod is provided with an air permeable channel along the axis, the large diameter end of the guide rod is provided with a breathable membrane for sealing the air permeable channel, and the small diameter portion of the guide rod is radially provided with radial air holes connected to the air permeable channel; the explosion-proof pressure relief valve and the battery pack assembly adopt a two-stage pressure relief method to ensure the pressure relief effect, and by providing the air permeable channel and the radial air permeable holes in the guide rod, the air path between the valve body and the valve core is unblocked, and the annular space between the valve body and the valve core is eliminated, so as to solve the problem that the valve core is easily stuck with the valve body when subjected to radial force while ensuring the maximum flux.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and more specifically, to an explosion-proof pressure relief valve. In addition, the present invention also relates to a battery pack assembly including the explosion-proof pressure relief valve. Background Art

[0002] With the development of the new energy industry and the subsequent concern about the safety of new energy, explosion-proof valves, as key components of new energy protection, are increasingly widely used. The market has higher and higher requirements for the protection performance and pressure relief capacity of explosion-proof valves. Most traditional explosion-proof valves use a valve core set in the valve body, and the two are connected by a spring. When the internal pressure is too high, the valve core partially slides out of the valve body, and the spring is compressed, so that the internal gas is released to achieve the purpose of pressure relief. The existing valve core is aligned with the rod-shaped component. When the explosion-proof valve is turned on, the valve core cannot completely slide out of the valve body to avoid the valve core being unable to reset. This causes the gas to flow only from the annular area between the valve core and the valve body, and the maximum flux is limited. When the internal and external pressure difference is too large, timely pressure relief cannot be achieved; moreover, when designing, the valve core diameter is required to be smaller than the inner diameter of the inner hole of the valve body, so that the annular space between the valve core and the valve body can appear. This will cause the valve core to swing left and right when it is impacted by radial water flow or air flow. In extreme cases, the valve core and the valve body will be stuck, causing the valve core to be unable to reset, thereby losing protection performance;

[0003] In summary, how to provide an explosion-proof pressure relief valve that can solve the problem of small maximum flux of existing explosion-proof valves and easy valve core jamming when subjected to radial impact is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an explosion-proof pressure relief valve, which adopts a two-stage pressure relief method to ensure the pressure relief effect, and by arranging an air permeable channel and a radial air permeable hole in the guide rod, the air path between the valve body and the valve core is unobstructed, and the annular space between the valve body and the valve core is eliminated. Under the premise of ensuring the maximum flux, the problem that the valve core is easily stuck with the valve body when subjected to radial force is solved.

[0005] Another object of the present invention is to provide a battery pack assembly including the above-mentioned explosion-proof pressure relief valve, which has the same technical features and can achieve the same purpose.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An explosion-proof pressure relief valve, comprising:

[0008] A valve body, with a stepped through hole disposed therein;

[0009] The valve core comprises a guide rod in the form of a stepped shaft, the small diameter portion of the guide rod is slidably mounted with the small diameter portion of the stepped through hole, and elastic parts are arranged along the relative sliding direction between the two; an air permeable passage is arranged along the axis of the guide rod, a breathable membrane for sealing the air permeable passage is arranged at the large diameter end of the guide rod, a radial air permeable hole connected to the air permeable passage is radially arranged at the small diameter portion of the guide rod, and when the guide rod slides toward the large diameter end of the stepped through hole, the air permeable passage can be connected to the large diameter end of the stepped through hole through the radial air permeable hole; the outer shoulder surface of the guide rod abuts against the inner shoulder surface of the stepped through hole, and a first sealing ring for sealing is arranged between the two.

[0010] Preferably, the valve core and the valve body are both injection molded from plastic material.

[0011] Preferably, a first guide sleeve is fixedly provided at one end of the small diameter portion of the stepped through hole close to the inner shaft shoulder surface, and the outer peripheral wall of the small diameter portion of the guide rod is in sliding contact with the inner peripheral wall of the first guide sleeve;

[0012] A second guide sleeve is fixedly provided at one end of the small diameter portion of the guide rod away from the outer shaft shoulder surface, and the outer peripheral wall of the second guide sleeve is in sliding contact with the inner peripheral wall of the small diameter portion of the stepped through hole;

[0013] The elastic member is coaxially sleeved in the annulus between the small diameter portion of the guide rod 201 and the small diameter portion of the stepped through hole, and both ends of the elastic member are respectively in contact with the facing end surfaces of the first guide sleeve and the second guide sleeve.

[0014] Preferably, a labyrinth-shaped axial limit groove is provided at the small-diameter end of the guide rod, and a limit column capable of being engaged in the axial limit groove is provided on the inner circumferential wall of the second guide sleeve.

[0015] Preferably, the valve core further comprises a gland fixedly connected to the large diameter end of the guide rod for shielding the breathable membrane, and a gap communicating with the surface of the breathable membrane is provided between the gland and the large diameter end of the guide rod.

[0016] Preferably, a plurality of groups of annular baffles are arranged in concentric circles between the large diameter end surface of the guide rod and the pressure cover, and a plurality of groups of ventilation notches are arranged at intervals between the annular baffles, and the axes of the notches of different groups of the annular baffles do not overlap.

[0017] Preferably, the pressure cover and the guide rod are made of plastic material, and a magnetic block is fixedly provided on an end surface of the pressure cover close to the guide rod.

[0018] Preferably, the valve body is in the form of a stepped shaft, the stepped through hole overlaps with the axis of the valve body, the outer circumference of the small diameter portion of the valve body is provided with an external thread, and the outer shaft shoulder surface of the valve body is provided with a second sealing ring.

[0019] A battery pack assembly comprises any one of the explosion-proof pressure relief valves described above.

[0020] Compared with the prior art, the explosion-proof pressure relief valve provided by the present invention has at least the following beneficial effects:

[0021] 1. By setting a breathable channel in the guide rod and a breathable membrane at the large diameter end of the guide rod, the breathable channel can always exchange gas and prevent moisture from entering. That is, when there is a pressure difference between the two ends of the valve core, gas can flow and pressure balance can be achieved without moisture entering.

[0022] 2. A radial vent hole is arranged on the small diameter part of the guide rod. When the valve core and the valve stem slide relative to each other, the radial vent hole can communicate with the large diameter end of the communicating vent channel and the stepped through hole, that is, realize the communication between the inner and outer ends of the valve core. It is mainly used when there is a large pressure difference at both ends of the valve core, and the air flow through the breathable diaphragm is not enough to balance the pressure difference on both sides. The air pressure pushes the elastic part to compress, so that the valve core and the valve stem move relative to each other, so that the radial vent hole is connected, and then the gas flow is accelerated, and then the air pressure on both sides of the valve core is balanced, so as to realize the explosion-proof function;

[0023] 3. Setting the air-permeable channel at the axial position of the guide rod helps to make the small-diameter part of the guide rod contact the inner diameter of the small-diameter part of the stepped through hole, thereby improving the ability of the valve core to resist radial force shaking when it slides out of the valve body, thereby solving the problem of the valve core getting stuck with the valve body when it slides out and avoiding loss of its protectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the structure of a specific explosion-proof pressure relief valve provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a specific explosion-proof pressure relief valve provided by the present invention in a normal state;

[0027] Figure 3 This is a schematic diagram of the structure of a specific explosion-proof pressure relief valve provided by the present invention in a rapid pressure relief state;

[0028] Figure 4 A schematic diagram of the structure of a specific guide rod provided by the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of a specific valve body provided by the present invention;

[0030] Figure 6 A schematic diagram of the structure of a specific gland provided by the present invention;

[0031] Figure 7 This is a schematic structural diagram of a specific second guide sleeve provided by the present invention.

[0032] Figure 1-Figure 7 middle:

[0033] 1. Valve body; 101. First guide sleeve; 102. First sealing ring installation groove; 103. Second sealing ring installation groove;

[0034] 2. Valve core; 201. Guide rod; 2011. Radial vent hole; 2012. Axial limit slot; 2013. Ventilation channel; 2014. First welding strip; 2015. End limit slot; 202. Second guide sleeve; 2021. Limiting column; 203. Gland; 2031. Limiting block; 2032. Second welding strip; 2033. Magnetic block fixing card; 204. Magnetic block; 205. Breathable membrane;

[0035] 3. Elastic parts;

[0036] 4. The first sealing ring;

[0037] 5. Second sealing ring. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The core of the present invention is to provide an explosion-proof pressure relief valve, which adopts a two-stage pressure relief method to ensure the pressure relief effect, and by arranging an air permeable channel and a radial air permeable hole in the guide rod, the air path between the valve body and the valve core is unobstructed, and the annular space between the valve body and the valve core is eliminated. Under the premise of ensuring the maximum flux, the problem that the valve core is easily stuck with the valve body when subjected to radial force is solved.

[0040] Another core of the present invention is to provide a battery pack assembly including the above-mentioned explosion-proof pressure relief valve, which has the same technical features and can achieve the same purpose.

[0041] Please refer to Figure 1-Figure 7 , an explosion-proof pressure relief valve, comprising:

[0042] The valve body 1 is provided with a stepped through hole inside;

[0043] The valve core 2 comprises a guide rod 201 in the form of a stepped shaft, the small diameter portion of the guide rod 201 is slidably mounted with the small diameter portion of the stepped through hole, and an elastic member 3 is provided along the relative sliding direction between the two; a breathable passage 2013 is provided along the axis of the guide rod 201, a breathable membrane 205 for sealing the breathable passage 2013 is provided at the large diameter end of the guide rod 201, a radial breathable hole 2011 communicating with the breathable passage 2013 is radially provided at the small diameter portion of the guide rod 201, and when the guide rod 201 slides toward the large diameter end of the stepped through hole, the breathable passage 2013 can be communicated with the large diameter end of the stepped through hole through the radial breathable hole 2011; the outer shaft shoulder surface of the guide rod 201 abuts against the inner shaft shoulder surface of the stepped through hole, and a first sealing ring 4 for sealing is provided between the two;

[0044] like Figure 2 As shown, a through-vent channel 2013 is provided at the axis position of the guide rod 201, and a vent membrane 205 is provided at the end of the vent channel 2013, so that the vent channel 2013 can always perform slow gas exchange and effectively prevent moisture exchange, so that the air pressure inside and outside the valve core 2 is in a balanced state, and its due protective performance is achieved;

[0045] like Figure 3 , a radial air hole 2011 is set on the small diameter part of the guide rod 201. When the valve core 2 slides out of the valve body 1, the radial air hole 2011 can connect the air passage 2013 and the large diameter end of the stepped through hole, that is, connect the two ends of the valve core 2, so as to realize the rapid flow of air at both ends of the valve core 2, quickly balance the air pressure at both ends of the valve core 2, and play a role in rapid pressure relief and explosion prevention. When the pressure difference on both sides decreases, the valve core 2 can be reset under the action of the elastic member 3, and under the action of the first sealing ring 4, the airway where the radial air hole 2011 is located is sealed, and the exchange of airflow or moisture cannot be carried out, so as to improve its protection performance;

[0046] At the same time, the air-permeable channel 2013 is used as an air passage and is arranged at the axial position of the guide rod 201, which helps to eliminate the annular space between the outer wall of the valve core 2 and the inner wall of the valve body 1, so that the valve core 2 cannot shake in the valve body 1, that is, when the valve core 2 slides out of the valve body 1, even if the valve core 2 is subjected to radial force, there is no space for radial sliding, thereby avoiding the problem of the valve core 2 and the valve body 1 being stuck, so that the valve core 2 can be quickly reset under the action of the elastic member 3 when the pressure on both sides is balanced;

[0047] At the same time, a first sealing ring 4 is provided between the outer shoulder surface of the guide rod 201 and the inner shoulder surface of the stepped through hole for sealing, which is used to cut off the airway where the radial air vent 2011 is located in a normal state, so as to improve its protection performance. In some embodiments, a first sealing ring installation groove 102 is provided on the inner shoulder surface of the stepped through hole, which is used for the fixed installation of the first sealing ring 4 to ensure the stability of its assembly position, wherein the first sealing ring 4 is preferably a double-rib sealing ring;

[0048] In some embodiments, the triggering pressure of the valve core 2 is adjusted by controlling the opening cross-sectional area of ​​the air permeable channel 2013 at one end of the air permeable membrane 205, that is, by reducing the cross-sectional area of ​​the air permeable channel 2013 at the position of the air permeable membrane 205, the pressure threshold for triggering the valve core 2 can be lowered, and vice versa, the triggering pressure threshold of the valve core 2 can be increased.

[0049] In some examples, the valve core 2 and the valve body 1 are both injection molded from plastic materials;

[0050] Compared with using metal materials to make the valve core 2 and the valve body 1, using plastic materials to make the valve core 2 and the valve body 1 has the characteristics of low cost, easy processing and high corrosion resistance. For example, in the prior art, the valve core 2 made of metal is mostly cylindrical. Due to the influence of the processing technology, the processing technology of the through hole at the axis and the radial through hole is relatively complicated, the processing difficulty is relatively large, the processing accuracy is difficult to guarantee, and the processing cost is relatively high. The use of plastic material injection molding can perfectly solve the above problems.

[0051] In some embodiments, Figure 2 and Figure 3 As shown, a first guide sleeve 101 is fixedly provided at one end of the small diameter portion of the stepped through hole close to the inner shaft shoulder surface, and the outer peripheral wall of the small diameter portion of the guide rod 201 is in sliding contact with the inner peripheral wall of the first guide sleeve 101;

[0052] A second guide sleeve 202 is fixedly provided at one end of the small diameter portion of the guide rod 201 away from the outer shaft shoulder surface, and the outer peripheral wall of the second guide sleeve 202 is in sliding contact with the inner peripheral wall of the small diameter portion of the stepped through hole;

[0053] The elastic member 3 is coaxially sleeved in the annular space between the small diameter portion of the guide rod 201 and the small diameter portion of the stepped through hole, and both ends of the elastic member 3 are respectively in contact with the end surfaces of the first guide sleeve 101 and the second guide sleeve 202 facing each other;

[0054] By adding a first guide sleeve 101 in the small diameter portion of the stepped through hole, and fixing a second guide sleeve 202 outside the small diameter portion of the guide rod 201, the linearity of the relative sliding between the guide rod 201 and the valve body 1 can still be ensured when the outer diameter of the small diameter portion of the guide rod 201 is smaller than the inner diameter of the small diameter portion of the stepped through hole, that is, the ability of the valve core 2 to resist radial forces is improved, so that when it is flushed by external radial water flow or air flow, it will not slide, thus avoiding the problem of the valve core 2 and the valve body 1 being stuck and difficult to reset. The structural design of the first guide sleeve 101 and the second guide sleeve 202 helps to reduce the machining accuracy requirements for the outer circumference of the guide rod 201 and the inner circumference of the stepped through hole, and further reduces the machining cost.

[0055] In some embodiments, the first guide sleeve 101 and the valve body 1 are integrally injection molded, which further reduces assembly steps and reduces processing costs.

[0056] In some embodiments, Figure 4 As shown, a labyrinth-shaped axial limit slot 2012 is provided at the small-diameter end of the guide rod 201, and a limit clamping column 2021 capable of being clamped in the axial limit slot 2012 is provided on the inner peripheral wall of the second guide sleeve 202;

[0057] When assembling the valve body 1 and the valve core 2, the small diameter end of the guide rod 201 is inserted from the large diameter end of the stepped through hole, and then the elastic member 3 is inserted into the small diameter end of the stepped through hole, and then the second guide sleeve 202 is inserted into the small diameter end of the stepped through hole, and the limiting clamping column 2021 in the second guide sleeve 202 is clamped with the axial limiting clamping groove 2012 of the guide rod 201 to achieve the relative position fixation of the second guide sleeve 202 and the small diameter end of the guide rod 201. The labyrinth-shaped axial limiting clamping groove 2012 is used to facilitate the assembly and fixation of the second guide sleeve 202 from the small diameter end of the guide rod 201.

[0058] At the same time, the end faces of the first guide sleeve 101 and the second guide sleeve 202 can abut against the two ends of the elastic member 3, and then use the deformation of the elastic member 3 to rotate with kinetic energy and potential energy, thereby driving the relative movement of the valve core 2 and the valve body 1.

[0059] In some embodiments, Figure 2 and Figure 3 As shown, the valve core 2 further includes a gland 203, which is fixedly connected to the large diameter end of the guide rod 201 and is used to shield the breathable membrane 205, and a gap communicating with the surface of the breathable membrane 205 is provided between the gland 203 and the large diameter end of the guide rod 201;

[0060] A pressure cap 203 is provided above the breathable membrane 205 to protect the breathable membrane 205 from external water flow scouring in the normal direction, thereby improving the protection performance of the breathable membrane 205. At the same time, a gap is provided between the pressure cap 203 and the large-diameter end face of the guide rod 201 to ensure the air permeability of the breathable membrane 205.

[0061] In some embodiments, Figure 4 As shown, a plurality of groups of annular baffles are arranged in a concentric circle between the large diameter end surface of the guide rod 201 and the pressure cover 203, and a plurality of groups of air-permeable notches are arranged at intervals between the annular baffles, and the axes of the notches of different groups of annular baffles do not overlap;

[0062] By providing an annular baffle between the gland 203 and the large diameter end face of the guide rod 201, and providing notches with non-overlapping axes between different groups of annular baffles, it is used to ensure that the air path in the gap between the gland 203 and the guide rod 201 is unobstructed. At the same time, since the notch axes do not overlap, the radial water flow of the outer diameter is effectively prevented from directly scouring the breathable membrane 205, thereby improving the protective performance of the breathable membrane 205;

[0063] In some implementations, an annular baffle is disposed at the large diameter end of the guide rod 201, and a first welding strip 2014 having a triangular cross section is disposed on the top of the annular baffle;

[0064] like Figure 6 As shown, an annular baffle is also provided on the end surface of the gland 203, and a second welding strip 2032 with a triangular cross section is provided on the top of the annular baffle. When the gland 203 and the guide rod 201 are fixed, the first welding strip 2014 and the second welding strip 2032 are melted, and then the large-diameter end surfaces of the gland 203 and the guide rod 201 are fitted together, and the two are welded into shape by using the molten material.

[0065] At the same time, an end limit slot 2015 is set on the annular baffle of the guide rod 201, and a limit block 2031 is set on the annular baffle of the pressure cover 203. When the pressure cover 203 and the guide rod 201 are welded, the limit block 2031 is clamped in the end limit slot 2015, so that the pressure cover 203 and the guide rod 201 have a correct relative position relationship, avoiding the notch on the annular baffle from being blocked, or avoiding the overlap of the notch axes on different groups of annular baffles.

[0066] In some embodiments, the pressure cover 203 and the guide rod 201 are made of plastic material, and a magnetic block 204 is fixedly disposed on the end surface of the pressure cover 203 close to the guide rod 201;

[0067] When testing the battery pack assembly, the explosion-proof pressure relief valve needs to be tested. The process is to test the relative movement and reset ability of the valve core 2 and the valve body 1. Since the valve core 2 is embedded in the valve body 1 and the valve core 2 is made of plastic material, a magnetic block 204 is implanted inside the valve core 2. The valve core 2 can be pulled out of the valve body 1 by adding a magnet on the top, thereby testing the relative movement ability of the valve core 2 and the valve body 1 and the reset ability of the valve core 2. The magnetic block 204 is preferably made of stainless iron and a magnet;

[0068] In some embodiments, a magnetic block fixing card 2033 is provided on one side of the pressure cover 203 close to the breathable membrane 205 . Before the pressure cover 203 and the guide rod 201 are welded, the magnetic block 204 is clamped in the magnetic block fixing card 2033 to make it integrated with the pressure cover 203 .

[0069] In some embodiments, Figure 5 As shown, the valve body 1 is in the form of a stepped shaft, the stepped through hole overlaps with the axis of the valve body 1, the outer circumference of the small diameter portion of the valve body 1 is provided with an external thread, and the outer shaft shoulder surface of the valve body 1 is provided with a second sealing ring 5;

[0070] By providing an external thread and a second sealing ring 5 on the outside of the valve body 1, the installation convenience of the explosion-proof pressure relief valve and the sealing performance of the installation position are improved;

[0071] A second sealing ring installation groove 103 is provided on the outer shaft shoulder surface of the valve body 1 for installing and fixing the second sealing ring 5 to ensure the correctness of its installation position and sealing performance;

[0072] At the same time, if Figure 1 As described above, the outer periphery of the large diameter portion of the valve body 1 is a hexagonal prism, which facilitates the installation of the control valve body 1 using tools.

[0073] In addition to the explosion-proof pressure relief valve disclosed in the above-mentioned embodiments, the present invention also provides a battery pack assembly including the above-mentioned explosion-proof pressure relief valve. For the structures of other parts of the battery pack assembly, please refer to the prior art and will not be described in detail herein.

[0074] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0075] The explosion-proof pressure relief valve and battery pack assembly provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An explosion-proof pressure relief valve, characterized in that: include: A valve body (1) having a stepped through hole disposed therein; The valve core (2) comprises a guide rod (201) in the form of a stepped shaft, the small diameter portion of the guide rod (201) being slidably mounted with the small diameter portion of the stepped through hole, and an elastic member (3) is provided between the two along a relative sliding direction; a breathable passage (2013) is provided along the axis of the guide rod (201), a breathable membrane (205) for sealing the breathable passage (2013) is provided at the large diameter end of the guide rod (201), a radial breathable hole (211) communicating with the breathable passage (2013) is radially provided at the small diameter portion of the guide rod (201), and when the guide rod (201) slides toward the large diameter end of the stepped through hole, the breathable passage (2013) can communicate with the large diameter end of the stepped through hole through the radial breathable hole (211); an outer axial shoulder surface of the guide rod (201) is in contact with an inner axial shoulder surface of the stepped through hole, and a first sealing ring (4) for sealing is provided between the two; The valve core (2) further comprises a gland (203), wherein the gland (203) is fixedly connected to the large-diameter end of the guide rod (201) and is used to shield the breathable membrane (205), and a gap communicating with the surface of the breathable membrane (205) is provided between the gland (203) and the large-diameter end of the guide rod (201); A plurality of groups of annular baffles are arranged in a concentric circle between the large diameter end surface of the guide rod (201) and the pressure cover (203), the annular baffles being provided with a plurality of groups of notches for ventilation at intervals, and the axes of the notches of different groups of annular baffles do not overlap; The annular baffle is arranged at the large-diameter end of the guide rod (201) and the end face of the pressure cover (203); a first welding strip (2014) and a second welding strip (2032) with a triangular cross section are respectively arranged at the top of the annular baffle; after the first welding strip (2014) and the second welding strip (2032) are melted, the pressure cover (203) and the large-diameter end face of the guide rod (201) are fitted together, and the two are welded into shape using the molten material; An end limit slot (2015) is provided on the annular baffle of the guide rod (201), and a limit block (2031) is provided on the annular baffle of the pressure cover (203), and the limit block (2031) is clamped in the end limit slot (2015); A first guide sleeve (101) is fixedly provided at one end of the small diameter portion of the stepped through hole close to the inner shaft shoulder surface, and the outer peripheral wall of the small diameter portion of the guide rod (201) is in sliding contact with the inner peripheral wall of the first guide sleeve (101); A second guide sleeve (202) is fixedly provided at one end of the small diameter portion of the guide rod (201) away from the outer shaft shoulder surface, and the outer peripheral wall of the second guide sleeve (202) is in sliding contact with the inner peripheral wall of the small diameter portion of the stepped through hole; The elastic member (3) is coaxially sleeved in the annular space between the small diameter portion of the guide rod (201) and the small diameter portion of the stepped through hole, and the two ends of the elastic member (3) are respectively in contact with the end surfaces of the first guide sleeve (101) and the second guide sleeve (202) facing each other; A labyrinth-shaped axial limit slot (2012) is provided at the small-diameter end of the guide rod (201), and a limit post (2021) capable of being clamped in the axial limit slot (2012) is provided on the inner peripheral wall of the second guide sleeve (202).

2. The explosion-proof pressure relief valve according to claim 1, characterized in that: The valve core (2) and the valve body (1) are both made of plastic injection molding.

3. The explosion-proof pressure relief valve according to claim 1, characterized in that: The pressure cover (203) and the guide rod (201) are made of plastic material, and a magnetic attraction block (204) is fixedly arranged in an end surface of the pressure cover (203) close to the guide rod (201).

4. The explosion-proof pressure relief valve according to any one of claims 1 to 3, characterized in that: The valve body (1) is in the form of a stepped shaft, the stepped through hole overlaps with the axis of the valve body (1), the outer circumference of the small diameter portion of the valve body (1) is provided with an external thread, and the outer shaft shoulder surface of the valve body (1) is provided with a second sealing ring (5).

5. A battery pack assembly, characterized in that: The invention comprises the explosion-proof pressure relief valve as described in any one of claims 1 to 4.

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