Pressure relief structure of immersed battery box

Abstract

The utility model relates to the technical field of immersed battery boxes, in particular to a pressure relief structure of an immersed battery box, which comprises a sleeve barrel and a pressure relief valve, one end of the barrel bottom of the sleeve barrel penetrates through a box cover and extends into a box body, and the inner side of the other end of the barrel bottom of the sleeve barrel is in threaded connection with an anti-explosion valve; the sleeve barrel is fixedly connected with the box cover, and a through hole is formed in the barrel bottom of the sleeve barrel in the axial direction. The pressure release valve is fixed to the barrel bottom of the inner side of the sleeve barrel and selectively blocks the through hole or explodes when the pressure in the box exceeds a preset threshold value. The utility model provides a pressure relief structure of an immersed battery box, which not only can ensure that an explosion-proof valve is not opened accidentally in a liquid injection process, but also does not influence the pressure relief requirement of the battery box in a subsequent use process, and solves the problem that the liquid injection fails as the explosion-proof valve is easy to open in advance in the liquid injection process of the existing immersed battery box.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of immersion type battery box, especially to a kind of relief structure of immersion type battery box. BACKGROUND

[0002] Immersion type battery box is a product with high safety performance, for example, the utility model discloses a battery box and immersion type cooling battery pack with publication (announcement) No.CN220527128U. Its principle is that battery pack is completely soaked in insulating oil-based coolant, and the battery cell is directly contacted with the coolant, and the heat is taken away by liquid circulation to ensure that the battery cell always operates within the optimum temperature range.

[0003] But the existing problem is: in the process of filling liquid into the box, the maximum pressure in the box can reach more than 0.6bar, and the common energy storage plug-in box explosion-proof valve opening pressure on the market is generally not more than 0.3bar. That is to say, when the liquid is not filled into the entire plug-in box, the explosion-proof valve on the cover will be opened, resulting in liquid filling failure. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a kind of relief structure of immersion type battery box, which can ensure that explosion-proof valve does not open unexpectedly during liquid filling process, and does not affect the pressure relief requirement in subsequent use process of battery box, solve the problem that existing immersion type battery box explosion-proof valve is easily opened in advance during liquid filling process and leads to liquid filling failure.

[0005] The technical scheme of the utility model is as follows:

[0006] The utility model provides a kind of relief structure of immersion type battery box, including sleeve bucket, still including pressure relief valve, wherein,

[0007] The bottom of the sleeve bucket is used to penetrate the cover and extend into the box body, and the inner side of the other end is used to screw the explosion-proof valve;

[0008] The sleeve bucket is fixedly connected with the cover, and the through hole is arranged on the bottom of the sleeve bucket along the axial direction;

[0009] The pressure relief valve is fixed on the bottom of the inner side of the sleeve bucket, and selectively blocks the through hole or bursts when the pressure in the box exceeds the predetermined threshold.

[0010] On the basis of the above technical scheme, preferably, the threshold of the pressure relief valve is 0.60bar.

[0011] On the basis of the above technical scheme, preferably, the through hole is in the shape of a long circular hole, and the pressure relief valve is in the shape of a long circular plate.

[0012] On the basis of the above technical scheme, preferably, the pressure relief valve is provided with a first groove on one end close to the through hole.

[0013] On the basis of the above technical scheme, preferably, a ring groove is arranged on the groove bottom of the first groove, wherein,

[0014] The first groove and the ring groove are both in the shape of an oblong circle.

[0015] On the basis of the above technical scheme, preferably, a V-shaped groove is arranged on the inner side of the ring groove, wherein,

[0016] The V-shaped groove is arranged on the groove bottom of the first groove and is in communication with the ring groove.

[0017] On the basis of the above technical scheme, preferably, a plurality of V-shaped grooves are arranged, wherein,

[0018] The plurality of V-shaped grooves are equidistantly arranged along the long side direction of the pressure relief valve.

[0019] On the basis of the above technical scheme, preferably, a flange is arranged on the outer side of the sleeve barrel.

[0020] On the basis of the above technical scheme, preferably, the utility model further comprises a PET patch, wherein,

[0021] The PET patch is fixed on the barrel bottom on the outer side of the sleeve barrel and covers the through hole;

[0022] A gas permeable hole is arranged through the PET patch, and the gas permeable hole is coaxially arranged with the through hole.

[0023] On the basis of the above technical scheme, preferably, a second groove is arranged on one end of the PET patch close to the pressure relief valve.

[0024] The pressure relief structure of the immersed battery box has the following beneficial effects relative to the prior art:

[0025] (1) The pressure relief valve is fixed on the barrel bottom on the inner side of the sleeve barrel and selectively blocks the through hole or bursts when the pressure in the box exceeds a predetermined threshold, so that the pressure relief valve can bear the liquid injection pressure, the explosion-proof valve will not be accidentally opened during the liquid injection process, the liquid injection process is facilitated, and when the pressure in the box exceeds the predetermined threshold of the pressure relief valve, the pressure relief valve bursts to ensure that the explosion-proof valve is normally opened, and the pressure relief requirement in the subsequent use process of the battery box is not affected.

[0026] (2) By setting the long circular sheet structure of the pressure relief valve, compared with the circular or other shapes, it can provide better stress distribution under the same area, reduce the local stress concentration, prolong the service life of the pressure relief valve. At the same time, by setting the ring groove, the stress can be dispersed in a larger area, further improving the pressure resistance of the pressure relief valve, ensuring stability in high pressure environment.

[0027] (3) By setting the first sink, it is convenient to provide additional buffer space for the pressure relief valve, reduce the direct contact between the pressure relief valve pressure relief part (i.e. the bottom part of the first sink) and the edge of the through hole, reduce the risk of wear and tear, further prolong the service life of the pressure relief valve.

[0028] (4) By setting the V-shaped groove, when the pressure in the box exceeds the predetermined threshold of the pressure relief valve, the V-shaped groove will fail quickly, ensuring that the pressure relief valve can be opened in time to release the excessive internal pressure, meeting the pressure relief requirements. At the same time, the geometric shape of the V-shaped groove makes it easier to break under high pressure, thereby improving the response speed of the pressure relief valve and ensuring quick pressure relief in emergency situations.

[0029] (5) By designing multiple V-shaped grooves, the redundancy of the pressure relief valve is increased, so that even if an individual V-shaped groove fails, the other V-shaped grooves can still work normally, ensuring the safety of the system. At the same time, it also ensures the uniform distribution of pressure on the pressure relief valve, avoiding uneven failure caused by excessive local pressure, further improving the reliability of the system.

[0030] (6) By setting the PET patch and the air hole, it is convenient to relieve the instantaneous high pressure generated during the liquid injection process through the air hole, prevent the explosion-proof valve from opening prematurely due to temporary high pressure fluctuations, and ensure the smooth completion of the liquid injection process. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0032] Figure 1 It is a perspective view of the pressure relief structure of the submerged battery box of the present application;

[0033] Figure 2 It is an exploded view of the pressure relief structure of the submerged battery box of the present application;

[0034] Figure 3 It is a partial top view of the pressure relief structure of the submerged battery box of the present application;

[0035] Figure 4 A-A sectional view of Figure 3

[0036] Figure 5 perspective view of the PET patch;

[0037] Figure 6 perspective view of the pressure relief valve;

[0038] In the figure: 1, barrel; 2, pressure relief valve; 3, box cover; 4, box body; 5, explosion-proof valve; 6, PET patch; 101, through hole; 102, flange; 201, first sink; 202, ring groove; 203, V-shaped groove; 301, assembly hole; 601, air hole; 602, second sink. DETAILED DESCRIPTION

[0039] The technical solutions in the utility model will be clearly and completely described below in combination with the specific implementation manners of the utility model. Obviously, the described implementation manners are only part of the implementation manners of the utility model, rather than all the implementation manners. Based on the implementation manners in the utility model, all the other implementation manners obtained by the ordinary skilled in the art without making creative efforts belong to the protection scope of the utility model.

[0040] As Figures 1-6 shown in the utility model, a pressure relief structure of an immersed battery box comprises a barrel 1 and a pressure relief valve 2.

[0041] Among them, one end of the barrel bottom of the barrel 1 is used for penetrating the box cover 3 and extending into the box body 4, and the inner side of the other end is used for screwing the explosion-proof valve 5; the barrel 1 is fixedly connected with the box cover 3, and the barrel bottom of the barrel 1 is provided with a through hole 101 in the axial direction; the pressure relief valve 2 is fixed on the barrel bottom of the inner side of the barrel 1 and selectively blocks the through hole 101 or bursts when the pressure in the box exceeds a predetermined threshold.

[0042] When injecting liquid, the pressure relief valve 2 is used to bear the injection pressure, and when the injection pressure is less than the pressure relief threshold of the pressure relief valve 2, the pressure relief valve 2 will not burst, thereby ensuring that the explosion-proof valve 5 will not be accidentally opened during the injection process, which is conducive to the smooth progress of the injection. After being put into use, when the pressure in the box exceeds the predetermined threshold of the pressure relief valve 2, the pressure relief valve 2 bursts to ensure that the explosion-proof valve 5 can normally open, without affecting the pressure relief requirement in the subsequent use process of the battery box, and ensuring the safety of the system. Among them, the threshold of the pressure relief valve 2 is 0.60 bar.

[0043] ​The box cover 3 is fixed on the top of the box body 4 by bolts, and the two together constitute a mounting plug-in box of the battery pack, wherein the bottom of one side of the plug-in box is provided with a water inlet, and the top is provided with a water outlet. When filling liquid, the liquid is filled from the water inlet until the entire plug-in box is immersed in the liquid, so that the battery pack is completely immersed in the cooling liquid, and at the same time the liquid begins to flow out of the water outlet, completing the entire cycle, taking away the heat and eliminating the safety hazard of the battery system.

[0044] The box cover 3 is provided with an assembly hole 301, and the sleeve barrel 1 is embedded in the assembly hole 301, and the hole wall of the assembly hole 301 and the outer barrel wall of the sleeve barrel 1 are welded and fixed and sealed by welding to prevent liquid leakage. In addition, the outer side of the sleeve barrel 1 is provided with a flange 102, so as to increase the contact area between the sleeve barrel 1 and the box cover 3 and enhance the stability of the entire pressure relief structure. At the same time, the existence of the flange 102 makes it easier to align and fix the sleeve barrel 1 during installation, simplifies the assembly process and improves the production efficiency.

[0045] The through hole 101 is in a long circular hole structure, and the pressure relief valve 2 is in a long circular plate structure. With this structure, the pressure relief valve 2 can completely cover the through hole 101, improving the sealing performance and preventing gas or liquid leakage. At the same time, the long circular structure can provide better stress distribution under the same area than the circular or other shapes, reducing local stress concentration and prolonging the service life of the pressure relief valve 2.

[0046] The first sink 201 is provided on one end of the pressure relief valve 2 close to the through hole 101, which provides additional buffer space for the pressure relief valve 2, reduces the direct contact between the pressure relief part of the pressure relief valve 2 (i.e. the bottom part of the first sink 201) and the edge of the through hole 101, and reduces the risk of wear. At the same time, the structure design of the first sink 201 helps the pressure relief valve 2 to better fit the bottom of the sleeve barrel 1, enhances the sealing performance and ensures good sealing effect in high pressure environment.

[0047] The bottom of the first sink 201 is provided with a ring groove 202, wherein the first sink 201 and the ring groove 202 are both in a long circular shape. Through this structure, the stress distribution is further optimized, that is, the design of the ring groove 202 enables the stress to be dispersed in a larger area, reducing local stress concentration and further improving the pressure resistance of the pressure relief valve 2. At the same time, the combination of the ring groove 202 and the first sink 201 makes the pressure relief valve 2 more stable in high pressure environment and less likely to deform or fail, thereby reducing the problem of accidental pressure relief.

[0048] The inner side of the ring groove 202 is provided with a V-shaped groove 203, wherein the V-shaped groove 203 is opened on the groove bottom of the first sink groove 201 and communicates with the ring groove 202. Through the structure, when the internal pressure of the box exceeds the predetermined threshold of the pressure relief valve 2, the V-shaped groove 203 will fail quickly, ensuring that the pressure relief valve 2 can be opened in time to release the excessive internal pressure and prevent dangerous accidents. At the same time, the geometric shape of the V-shaped groove 203 makes it easier to break under high pressure, thereby improving the response speed of the pressure relief valve 2 and ensuring that it can quickly release pressure in an emergency. Further, the V-shaped groove 203 is provided with a plurality of V-shaped grooves 203, wherein the plurality of V-shaped grooves 203 are arranged equidistantly along the long side direction of the pressure relief valve 2, for uniformly distributing pressure and enhancing reliability. Specifically, the arrangement of the plurality of V-shaped grooves 203 ensures uniform distribution of pressure on the pressure relief valve 2, avoiding uneven failure caused by excessive local pressure. Moreover, the plurality of V-shaped grooves 203 increase the redundancy of the pressure relief valve 2, so that even if an individual V-shaped groove 203 fails, the other V-shaped grooves 203 can still work normally, ensuring the safety of the system.

[0049] The inner side wall of the sleeve barrel 1 is provided with an internal thread, and the mounting end of the explosion-proof valve 5 is provided with an external thread corresponding to the internal thread. The two threads are engaged with each other to achieve the screw connection and fixation of the explosion-proof valve 5 and the sleeve barrel 1. Through this structure, the installation of the explosion-proof valve 5 is facilitated, and assembly is convenient. The explosion-proof valve 5 adopts any one of the existing explosion-proof valves, for example, the explosion-proof valve introduced in a battery box and immersed cooling battery pack (publication number CN220527128U).

[0050] As shown in Figure 3 The PET patch 6 is welded to the bottom of the outer side of the sleeve barrel 1, wherein the PET patch 6 covers the through hole 101, and the PET patch 6 is provided with a gas permeable hole 601. The gas permeable hole 601 is coaxially arranged with the through hole 101, which is used to relieve the instantaneous high pressure generated during the liquid injection process, prevent the explosion-proof valve 5 from opening prematurely due to temporary high pressure fluctuations, and ensure the smooth completion of the liquid injection process.

[0051] The PET patch 6 is provided with a second sink groove 602 at one end close to the pressure relief valve 2, and the second sink groove 602 is used to make the contact between the PET patch 6 and the bottom of the sleeve barrel 1 more closely and improve the firmness of the connection.

[0052] In the above structure, the material of the sleeve barrel 1 is AL6061-T6, and the material of the pressure relief valve 2 is AL-MFX2-0.

[0053] The installation method of the pressure relief structure of the immersed battery box of the utility model is as follows:

[0054] PET patch 6 is welded on the bottom of the outer barrel 1, and then pressure relief valve 2 is welded on the bottom of the inner barrel 1. Then, a mounting hole 301 is formed by drilling a hole on the box cover 3, the barrel 1 is inserted into the mounting hole 301 and welded, and after welding, the flange 102 is tightly attached to the top surface of the box cover 3. Then, the explosion-proof valve 5 is screwed into the barrel 1.

[0055] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pressure relief structure of an immersion battery tank, comprising a sleeve barrel (1), characterized in that: Further comprising a pressure relief valve (2), wherein, One end of the barrel bottom of the sleeve barrel (1) is used to penetrate the box cover (3) and extend into the box body (4), and the inner side of the other end is used to screw the explosion-proof valve (5); The sleeve barrel (1) is fixedly connected with the box cover (3), and the barrel bottom of the sleeve barrel (1) is provided with a through hole (101) in the axial direction; The pressure relief valve (2) is fixed on the barrel bottom of the inner side of the sleeve barrel (1), and selectively blocks the through hole (101) or bursts when the pressure in the box exceeds a predetermined threshold.

2. The pressure relief structure of an immersed battery tank according to claim 1, characterized by: The threshold of the pressure relief valve (2) is 0.60 bar.

3. The pressure relief structure of an immersed battery tank according to claim 2, characterized by: The through hole (101) is in an oblong hole structure, and the pressure relief valve (2) is in an oblong plate structure.

4. The pressure relief structure of an immersed battery tank according to claim 3, characterized by: The pressure relief valve (2) is provided with a first sink (201) on one end close to the through hole (101).

5. The pressure relief structure of an immersed battery tank according to claim 4, characterized by: The bottom of the first sink (201) is provided with a ring groove (202), wherein, The first sink (201) and the ring groove (202) are both in an oblong shape.

6. The pressure relief structure of an immersed battery tank according to claim 5, characterized by: The inner side of the ring groove (202) is provided with a V-shaped groove (203), wherein, The V-shaped groove (203) is opened on the bottom of the first sink (201) and is in communication with the ring groove (202).

7. The pressure relief structure of an immersed battery tank according to claim 6, characterized by: The V-shaped groove (203) is provided with a plurality of V-shaped grooves. The plurality of V-shaped grooves (203) are equidistantly arranged along the long side direction of the pressure relief valve (2).

8. The pressure relief structure of an immersed battery tank according to claim 1, characterized by: The outer side of the sleeve barrel (1) is provided with a flange (102).

9. A pressure relief structure for an immersion battery tank according to any one of claims 1 to 8, wherein: Further comprising a PET patch (6), wherein, The PET patch (6) is fixed on the barrel bottom of the outer side of the sleeve barrel (1) and covers the through hole (101); The PET patch (6) is provided with a breathable hole (601) penetratingly, and the breathable hole (601) is coaxially arranged with the through hole (101).

10. The pressure relief structure of an immersed battery tank according to claim 9, characterized by: The PET patch (6) is provided with a second sink (602) on one end close to the pressure relief valve (2).

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