Explosion-proof pressure release valve for immersed battery pack

Abstract

The utility model discloses an explosion-proof pressure release valve for an immersed battery pack, which relates to the technical field of battery pack accessories, and comprises a main body, a through hole is formed in the main body, one end of the through hole is a liquid inlet hole of the main body, and the other end of the through hole is a liquid outlet hole; the gland covers the liquid outlet hole of the main body; the guide rod is detachably mounted on the side, facing the liquid inlet hole, of the gland; the elastic connecting piece is arranged between the main body and the guide rod, and the elastic connecting piece can stretch out and draw back in the axial direction of the guide rod; by means of the design of the liquid baffle, when a battery pack is impacted in the transportation process, the liquid baffle can share most impact force, so that the impact of fluid on the guide rod is weakened, abnormal opening of the anti-explosion pressure release valve is avoided, meanwhile, the pre-tightening force of a spring does not need to be adjusted, and the anti-explosion pressure release valve is convenient to use. And the pressure relief capability is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of battery pack accessories, and more specifically, to an explosion-proof pressure relief valve for an immersion battery pack. Background Technology

[0002] With the development of the new energy industry, battery packs are adopting an immersion cooling method to improve the safety of new energy equipment. This means the battery pack is filled with coolant, and the batteries and other components are completely submerged in the coolant. While immersion battery packs improve heat dissipation efficiency, during transportation or when subjected to vibration, the inertia of the fluid can cause the coolant to impact the explosion-proof pressure relief valve, potentially leading to abnormal opening of the valve, causing fluid leakage from the battery pack, resulting in equipment failure, and even posing safety risks.

[0003] In related technologies, increasing the preload of the spring is used to prevent coolant from impacting the explosion-proof pressure relief valve and causing it to open abnormally. However, increasing the preload of the spring will increase the opening pressure of the explosion-proof pressure relief valve, which will greatly weaken the pressure relief capacity of the battery pack.

[0004] In summary, how to ensure the pressure relief capacity of the battery pack while preventing the explosion-proof pressure relief valve from being impacted and opening abnormally is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an explosion-proof pressure relief valve for immersion battery packs, which effectively solves the problem of abnormal opening of the explosion-proof pressure relief valve when subjected to impact, causing fluid leakage from the battery pack.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An explosion-proof pressure relief valve for an immersion battery pack includes:

[0008] The main body has a through hole inside, one end of which is the liquid inlet and the other end is the liquid outlet.

[0009] A pressure cap, which closes onto the liquid outlet of the main body;

[0010] A guide rod, which is detachably mounted on the side of the pressure cap facing the liquid inlet;

[0011] An elastic connector is disposed between the main body and the guide rod, and the elastic connector is capable of extending and retracting along the axial direction of the guide rod;

[0012] A liquid baffle is disposed at the liquid inlet of the main body.

[0013] Preferably, the outer surface of the main body has a threaded portion, and a nut is screwed onto the threaded portion, and the main body is mounted on the battery pack by the nut.

[0014] Preferably, a sealing groove is formed between the main body and the pressure cap, the sealing groove is arranged in a ring on the outside of the liquid outlet, and an O-ring is press-fitted into the sealing groove.

[0015] Preferably, the side of the pressure cap facing the liquid inlet has a connecting portion, the surface of the connecting portion is provided with external threads, and the end of the guide rod facing the pressure cap has a threaded hole so that the guide rod is threadedly connected to the connecting portion.

[0016] Preferably, a support base is provided inside the main body, and a limiting hole is opened in the middle of the support base, and the guide rod is movably inserted into the limiting hole.

[0017] Preferably, the guide rod has a lower end plate at the end away from the pressure cover. The cross-sectional dimension of the lower end plate is larger than that of the guide rod. One end of the elastic connector is fixed to the support seat, and the other end is fixed to the lower end plate. The guide rod and the lower end plate are integrally formed.

[0018] Preferably, the elastic connector is a linear spring.

[0019] Preferably, the liquid baffle has a first hole and a second hole, one end of the guide rod extends through the first hole to the outside of the main body, and the second hole is spaced apart from the first hole, and the second hole is used to allow fluid to pass through.

[0020] Preferably, the first hole is formed in the middle of the baffle plate, and a plurality of second holes are provided, which are evenly distributed in a ring around the outer periphery of the first hole.

[0021] Preferably, an insert groove is formed on the outer surface of the main body, the opening of the insert groove faces the end of the main body where the liquid inlet hole is provided, and a special-shaped sealing ring is provided in the insert groove.

[0022] The present invention provides an explosion-proof pressure relief valve for submersion, comprising a main body having a through hole, one end of which is a liquid inlet and the other end of which is a liquid outlet; a pressure cap that covers the liquid outlet of the main body; a guide rod that is detachably installed on the side of the pressure cap facing the liquid inlet; an elastic connector disposed between the main body and the guide rod, the elastic connector being axially extendable along the guide rod; and a baffle plate disposed at the liquid inlet of the main body.

[0023] The immersion-type explosion-proof pressure relief valve provided by this utility model utilizes the design of a baffle plate. When the battery pack is impacted during transportation, the baffle plate can share most of the impact force, thereby reducing the impact of the fluid on the guide rod and preventing the explosion-proof pressure relief valve from opening abnormally. At the same time, it does not require adjustment of the spring preload, thus ensuring the pressure relief capacity. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the explosion-proof pressure relief valve in this embodiment;

[0026] Figure 2 This is a schematic cross-sectional view of the explosion-proof pressure relief valve body when it is closed in this embodiment.

[0027] Figure 3 This is a schematic cross-sectional view of the explosion-proof pressure relief valve body when it is open in this embodiment.

[0028] Figure 4 This is a schematic diagram of the overall structure of the explosion-proof pressure relief valve in this embodiment.

[0029] Figures 1-4 In the accompanying drawings, the reference numerals include:

[0030] 1. Main body; 11. Liquid inlet; 12. Liquid outlet; 13. Threaded part;

[0031] 2. Gland; 21. Connecting part; 3. Guide rod; 31. Threaded hole;

[0032] 4. Flexible connectors; 41. Linear springs;

[0033] 5. Baffle plate; 51. First hole; 52. Second hole; 6. Nut;

[0034] 7. O-ring; 8. Support base; 9. Lower end plate; 10. Special-shaped sealing ring. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model do not indicate any order, quantity, or importance. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. This application discloses an explosion-proof pressure relief valve for an immersion battery pack.

[0037] The core of this utility model is to provide an explosion-proof pressure relief valve for immersion battery packs.

[0038] Please refer to Figures 1 to 4 .

[0039] The immersion-type explosion-proof pressure relief valve provided by this utility model includes a main body 1, a pressure cap 2, a guide rod 3, an elastic connector 4, and a baffle plate 5. A through hole is provided in the main body 1, one end of which is the liquid inlet 11 of the main body 1, and the other end is the liquid outlet 12. The pressure cap 2 covers the liquid outlet 12 of the main body 1. The guide rod 3 is detachably installed on the side of the pressure cap 2 facing the liquid inlet 11. The elastic connector 4 is disposed between the main body 1 and the guide rod 3. The elastic connector 4 can extend and retract along the axial direction of the guide rod 3. The baffle plate 5 is disposed at the liquid inlet 11 of the main body 1.

[0040] The aforementioned submersible explosion-proof pressure relief valve, by adding a baffle plate 5 to the main body 1, can share most of the impact force when the battery pack is impacted during transportation, thereby reducing the impact of fluid on the guide rod 3 and preventing the explosion-proof pressure relief valve from opening abnormally.

[0041] By adding a baffle plate 5 instead of adjusting the spring preload, the abnormal opening of the explosion-proof pressure relief valve is prevented, thus ensuring the pressure relief capacity of the explosion-proof pressure relief valve.

[0042] The immersion-type explosion-proof pressure relief valve provided by this utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0043] In one specific implementation, reference is made to... Figure 2 A threaded portion 13 is formed on the outer surface of the main body 1, and a nut 6 is screwed onto the threaded portion 13. The main body 1 is mounted on the battery pack by means of the nut 6.

[0044] Specifically, when nut 6 is screwed onto body 1, a fixed space for connecting the battery pack is formed between body 1 and nut 6. During installation, body 1 is pressed against the outer surface of battery pack, at which point the threaded portion 13 of body 1 extends partially or completely into battery pack. Then, nut 6 is tightened onto the inner surface of battery pack, thus completing the installation of the valve body.

[0045] Based on any of the above embodiments, refer to Figure 2 and Figure 3 A sealing groove is formed between the main body 1 and the pressure cap 2. The sealing groove is arranged in a ring on the outside of the liquid outlet 12, and an O-ring 7 is press-fitted into the sealing groove.

[0046] Specifically, the stepped structure protruding into the body 1 is an annular sheet. A sealing groove is formed on the side of the annular sheet facing the cover 2, ensuring that the orthogonal projection of the cover 2 can completely cover the sealing groove. An O-ring 7 is fitted into the annular groove. When the cover 2 is closed on the body 1, the O-ring 7 can improve the sealing effect between the cover 2 and the body 1, preventing abnormal leakage of fluid.

[0047] Based on any of the above embodiments, refer to Figure 2 and Figure 3 A connecting part 21 is formed on the side of the pressure cap 2 facing the liquid inlet hole 11. The surface of the connecting part 21 is provided with external threads. A threaded hole 31 is opened at the end of the guide rod 3 facing the pressure cap 2 so that the guide rod 3 is threadedly connected to the connecting part 21.

[0048] Specifically, a stepped structure is formed by protruding inward at one end of the main body 1 near the liquid outlet 12. When the pressure cap 2 is placed on the main body 1, the end face of the pressure cap 2 is in full contact with the stepped structure to form a seal. The connecting part 21 is located in the middle of the pressure cap 2, and the central axis of the connecting part 21 coincides with the central axis of the threaded hole 31. When the guide rod 3 is threadedly connected to the pressure cap 2, the two can achieve synchronous displacement.

[0049] It should be noted that in some other embodiments, the pressure cap 2 and the guide rod 3 may also adopt other detachable connection structures, such as snap-fit ​​connections.

[0050] Based on any of the above embodiments, refer to Figure 3 A support base 8 is provided inside the main body 1. A limiting hole is opened in the middle of the support base 8, and the guide rod 3 is movably inserted into the limiting hole.

[0051] Specifically, the support base 8 is fixed to the middle of the main body 1. The limiting hole extends along the axial direction of the guide rod 3 and passes through both end faces of the support base 8. The end of the guide rod 3 away from the pressure cap 2 extends along the central axis of the main body 1 towards the liquid inlet hole 11. The support base 8 is mainly used to provide basic support for one end of the elastic connector 4, and can also constrain the displacement direction of the guide rod 3. The specific structure of the support base 8 and the connection method between it and the main body 1 adopt conventional technical means, and will not be described in detail here.

[0052] Based on any of the above embodiments, refer to Figure 3 The guide rod 3 is provided with a lower end plate 9 at the end away from the pressure cover 2. The cross-sectional dimension of the lower end plate 9 is larger than that of the guide rod 3. The elastic connector 4 is provided between the support base 8 and the lower end plate 9.

[0053] Specifically, the guide rod 3 is a cylindrical rod, and the lower end plate 9 is a circular thin plate with its center located on the central axis of the guide rod 3, so that the end of the guide rod 3 away from the liquid outlet hole 12 forms a horizontal support surface that extends uniformly outward to provide support space for the elastic connector 4.

[0054] With the above structure, when the end of the guide rod 3 near the liquid inlet 11 is subjected to a sufficiently large external force toward the liquid outlet 12, the guide rod 3 and the pressure cap 2 move synchronously away from the main body 1, and the elastic connector 4 is compressed. At this time, the valve body opens to release pressure. After the pressure is released, the external force on the guide rod 3 decreases, the elastic connector 4 recovers its deformation, and the pressure cap 2 and the guide rod 3 are reset, and the valve body closes.

[0055] Based on any of the above embodiments, refer to Figure 1 The elastic connector 4 includes a linear spring 41, one end of which abuts against the support base 8, and the other end of which abuts against the lower end plate 9.

[0056] The guide rod 3 passes through the hollow part of the linear spring 41. One end of the linear spring 41 is fixed to the lower end face of the support base 8, and the other end is fixed to the upper end face of the lower end plate 9. When the guide rod 3 and the pressure cap 2 are displaced, the support base 8 remains fixed, and the end of the linear spring 41 fixed to the lower end plate 9 moves closer to or away from the support base 8. When it moves closer to the support base 8, the linear spring 41 is compressed, and when it moves away from the support base 8, the linear spring 41 is stretched.

[0057] Based on any of the above embodiments, refer to Figure 4 A first hole 51 and a second hole 52 are provided on the liquid baffle plate 5. One end of the guide rod 3 extends through the first hole 51 to the outside of the main body 1. The second hole 52 is distributed at intervals with the first hole 51 and is used to allow fluid to pass through.

[0058] Specifically, the cross-sectional dimension of the first hole 51 is larger than that of the lower end plate 9 to ensure that the guide rod 3 and the lower end plate 9 can be displaced through the first hole 51, ensuring that the explosion-proof pressure relief valve can function properly. The second hole 52 connects the internal space of the main body 1 with the battery pack. When the internal pressure of the battery pack reaches the set value, the pressure cap 2 moves and drives the elastic connector 4 to compress. At this time, the valve body opens, and the high-pressure fluid enters the valve body through the second hole 52 and then exits through the outlet hole 12 to complete the pressure relief and ensure the safety of the battery pack.

[0059] Based on any of the above embodiments, refer to Figure 4 The first hole 51 is formed in the middle of the baffle plate 5, and several second holes 52 are provided, which are evenly distributed in a ring around the outer periphery of the first hole 51.

[0060] Specifically, by setting multiple second holes 52 and distributing them evenly around the outer periphery of the first hole 51, the pressure relief capacity of the valve body can be guaranteed. At the same time, when high-pressure fluid passes through multiple second holes 52 simultaneously, the external forces on each part of the baffle plate 5 are balanced, which can prevent damage or unstable connection of the baffle plate 5 due to unbalanced forces on each part during long-term operation of the valve body.

[0061] Based on any of the above embodiments, refer to Figure 2 and Figure 3 An insert groove is formed on the outer surface of the main body 1. The opening of the insert groove faces the end of the main body 1 where the liquid inlet hole 11 is provided. A special-shaped sealing ring 10 is provided in the insert groove.

[0062] Specifically, when the main body 1 is installed on the battery pack, the mounting groove faces the battery pack and forms a sealed cavity with the outer surface of the battery pack. The irregular sealing ring 10 is set in the mounting groove, which can improve the sealing effect between the explosion-proof pressure relief valve and the battery pack installation point, and prevent the fluid inside the battery pack from leaking out.

[0063] The implementation principle of an explosion-proof pressure relief valve for an immersion battery pack according to an embodiment of this application is as follows: Initially, the nut 6 is separated from the main body 1, and the elastic connector 4 naturally extends, so that the end of the guide rod 3 with the lower end plate 9 is located outside the main body 1. When installing the valve body, the main body 1 is pressed tightly against the outer mounting surface of the battery pack, and the threaded part 13 of the guide rod 3 and the main body 1 extends into the battery pack. Then, the nut 6 is tightened from inside the battery pack, so that the nut 6 is pressed against the inner surface of the battery pack, thus completing the installation of the valve body.

[0064] During battery pack transportation or when subjected to external impact, the fluid exerts an impact force on the valve body. Due to the action of the baffle plate 5, the impact of the fluid is greatly reduced, thereby preventing the valve body from opening accidentally.

[0065] When the internal pressure of the battery pack reaches the set value, the guide rod 3 and the pressure cap 2 move away from the main body 1, causing the elastic connector 4 to compress, at which point the valve body opens. The high-pressure fluid is discharged through the second hole 52 of the baffle plate 5 and the outlet hole 12, completing the pressure relief and ensuring the safety of the battery pack.

[0066] The above provides a detailed description of the explosion-proof pressure relief valve for an immersion battery pack provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. An explosion-proof pressure relief valve for an immersion battery pack, characterized in that, include: The main body (1) has a through hole inside, one end of which is the liquid inlet (11) of the main body (1) and the other end is the liquid outlet (12). A pressure cap (2) is fitted onto the liquid outlet (12); Guide rod (3), the guide rod (3) is detachably installed on the side of the pressure cap (2) facing the liquid inlet (11); An elastic connector (4) is disposed between the main body (1) and the guide rod (3), and the elastic connector (4) can extend and retract along the axial direction of the guide rod (3); A baffle plate (5) is provided at the liquid inlet (11).

2. The explosion-proof pressure relief valve for an immersion battery pack according to claim 1, characterized in that, The outer surface of the main body (1) has a threaded portion (13), and a nut (6) is screwed onto the threaded portion (13). The main body (1) is mounted on the battery pack by the nut (6).

3. The explosion-proof pressure relief valve for an immersion battery pack according to claim 1, characterized in that, A sealing groove is formed between the main body (1) and the pressure cap (2). The sealing groove is arranged in a ring on the outside of the liquid outlet (12). An O-ring (7) is press-fitted into the sealing groove.

4. The explosion-proof pressure relief valve for an immersion battery pack according to claim 1, characterized in that, The pressure cap (2) has a connecting part (21) on the side facing the liquid inlet (11). The surface of the connecting part (21) is provided with external threads. The guide rod (3) has a threaded hole (31) at one end facing the pressure cap (2) so that the guide rod (3) is threadedly connected to the connecting part (21).

5. The explosion-proof pressure relief valve for an immersion battery pack according to claim 1, characterized in that, The main body (1) is provided with a support base (8), and a limiting hole is opened in the middle of the support base (8). The guide rod (3) is movably inserted into the limiting hole.

6. The explosion-proof pressure relief valve for an immersion battery pack according to claim 5, characterized in that, The guide rod (3) has a lower end plate (9) at the end away from the pressure cap (2). The cross-sectional dimension of the lower end plate (9) is larger than that of the guide rod (3) so that the elastic connector (4) is disposed between the support base (8) and the lower end plate (9).

7. The explosion-proof pressure relief valve for an immersion battery pack according to claim 6, characterized in that, The elastic connector (4) includes a linear spring (41), one end of which abuts against the support base (8), and the other end of which abuts against the lower end plate (9).

8. An explosion-proof pressure relief valve for an immersion battery pack according to any one of claims 1-7, characterized in that, The baffle plate (5) has a first hole (51) and a second hole (52). One end of the guide rod (3) extends through the first hole (51) to the outside of the main body (1). The second hole (52) is spaced apart from the first hole (51) and is used to allow fluid to pass through.

9. The explosion-proof pressure relief valve for an immersion battery pack according to claim 8, characterized in that, The first hole (51) is formed in the middle of the baffle plate (5), and a plurality of second holes (52) are provided, which are evenly distributed in a ring around the outer periphery of the first hole (51).

10. An explosion-proof pressure relief valve for an immersion battery pack according to any one of claims 1-7, characterized in that, The outer surface of the main body (1) is formed with an insert groove, and the opening of the insert groove faces the end of the main body (1) where the liquid inlet hole (11) is located. A special-shaped sealing ring (10) is provided in the insert groove.

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