Punch-pull explosion-proof piece

Abstract

The utility model relates to the technical field of battery explosion prevention, and provides a punching and pulling explosion-proof piece which comprises an explosion-proof piece body and a punching and pulling structure, the punching and pulling structure is concavely arranged on the explosion-proof piece body in the thickness direction; the punching and pulling structure is formed by a part of the explosion-proof piece body through punching and / or die drawing, and the structural strength of the punching and pulling structure is smaller than that of other parts of the explosion-proof piece body. Compared with a nick-type anti-explosion piece in the prior art, the punching-pulling anti-explosion piece does not generate metal chippings during processing and manufacturing, and an anti-rust coating on the surface layer of the anti-explosion piece body is not influenced; compared with a welding type anti-explosion sheet in the prior art, the punching-pulling anti-explosion piece does not need to adopt a welding process during installation.

Description

Technical Field

[0001] The present invention relates to the technical field of battery explosion-proof, and in particular to a punching and pulling explosion-proof component. Background Art

[0002] In the prior art, a more common explosion-proof method for batteries is to set an explosion-proof plate. There are generally two processing and setting methods for the explosion-proof plate. One is a notching method, that is, a plurality of notches are processed and set on the surface of the explosion-proof plate to weaken the local structure of the explosion-proof plate, so that when high-pressure gas is generated inside the battery, cracks can appear at the notches of the explosion-proof plate to release the internal air pressure of the battery; the other is a welding method, in which a thinner explosion-proof plate is welded to a battery structural member. When high-pressure gas is generated inside the battery, cracks can also appear in the thinner explosion-proof plate to release the internal air pressure of the battery.

[0003] The above two settings of the explosion-proof plate have their own disadvantages. The notched explosion-proof plate is prone to produce more metal chips during the notching process, and it will also affect the anti-rust coating of the explosion-proof plate, reducing the effective service life of the explosion-proof plate; the welded explosion-proof plate requires an additional welding process with the battery structural parts before it can be installed, which is less convenient to use and is easily restricted in installation.

[0004] Therefore, there is an urgent need for a new type of battery explosion-proof plate on the market to solve the problems of the battery explosion-proof plate in the prior art that the processing affects its own anti-rust coating and the installation convenience is poor. Utility Model Content

[0005] The disclosed embodiment provides a punching and drawing explosion-proof part, in order to solve the problems in the prior art that the processing of the battery explosion-proof piece affects its own rust-proof coating and the installation convenience is poor.

[0006] The punching and pulling explosion-proof component provided in the embodiment of the present disclosure includes an explosion-proof component body and a punching and pulling structure;

[0007] The punching and pulling structure is recessed in the explosion-proof component body along the thickness direction;

[0008] The punching and drawing structure is formed by stamping and / or drawing a part of the explosion-proof component body, and the structural strength of the punching and drawing structure is lower than the structural strength of other parts of the explosion-proof component body.

[0009] In one possible implementation manner, the punching and pulling structure includes a first punching and pulling portion and a second punching and pulling portion;

[0010] Wherein, the thickness of the first punching and pulling portion is smaller than the thickness of the second punching and pulling portion, and the thickness of the second punching and pulling portion is smaller than the thickness of the explosion-proof component body;

[0011] And the second punching and pulling portion is integrally connected to the outside of the first punching and pulling portion.

[0012] In one possible implementation manner, the explosion-proof component body is a circular sheet;

[0013] The first punching and pulling portion is located at the center of the explosion-proof component body;

[0014] The second punching and pulling portion is concentrically arranged around the outer periphery of the first punching and pulling portion.

[0015] In one embodiment, the first punching and drawing portion includes a central portion and a first cylindrical portion arranged around the outer circumference of the central portion;

[0016] Along the radial direction from the inside to the outside of the punch-pull explosion-proof component, the first cylindrical portion is configured to be in the shape of a trumpet with a small inner opening and a large outer opening.

[0017] In one embodiment, the second punching and drawing portion includes an annular portion and a second cylindrical portion disposed around the outer circumference of the annular portion;

[0018] The annular portion is flushly arranged and connected to the outer opening of the first cylindrical portion;

[0019] Along the radial direction from the inside to the outside of the punch-pull explosion-proof component, the second cylindrical portion is configured to be in the shape of a trumpet with a small inner opening and a large outer opening.

[0020] In one possible implementation manner, the explosion-proof component body is a rectangular sheet;

[0021] The first punching and pulling portion is located at the central axis of the explosion-proof component body;

[0022] The second punching and drawing parts are symmetrically arranged on both sides of the first punching and drawing part.

[0023] In one embodiment, the first punching and pulling portion includes a rectangular portion and first inclined portions symmetrically located on both sides of the rectangular portion;

[0024] The thickness of the first slope portion is configured to gradually increase in a direction away from the rectangular portion.

[0025] In one embodiment, the second punching and pulling portion includes a flat portion and a second inclined portion located on one side of the flat portion;

[0026] The thickness of the second slope portion is configured to gradually increase in a direction away from the rectangular portion.

[0027] In one possible implementation manner, along the thickness direction of the rectangular sheet, the punching and pulling structures are respectively provided in corresponding depressions on both sides of the rectangular sheet.

[0028] In one possible implementation, among the two punching and pulling structures, one is arranged along the central axis of the length direction of one side of the rectangular sheet body, and the other is arranged along the central axis of the width direction of the other side of the rectangular sheet body.

[0029] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0030] The punching and pulling explosion-proof parts provided in the embodiments of the present disclosure can be specifically but not limited to being installed in the pressure relief port in the battery pack. When high-pressure gas is accidentally generated inside the battery pack, since the structural strength of the punching and pulling structure is less than the structural strength of other parts of the explosion-proof part body, the punching and pulling structure will first crack under the top pressure of the high-pressure gas, allowing the high-pressure gas to be discharged and thus play an explosion-proof role for the battery pack.

[0031] Compared with the notched explosion-proof pieces in the prior art, the punched and pulled explosion-proof parts provided in the embodiments of the present disclosure will not generate metal debris during processing and manufacturing, nor will they affect the anti-rust coating on the surface of the explosion-proof parts. Compared with the welded explosion-proof sheets in the prior art, the punched and pulled explosion-proof parts provided in the embodiments of the present disclosure do not require welding technology during installation, and can be installed in a variety of ways such as pasting, snap-on pressing, and threaded plugging, making installation extremely convenient.

[0032] Therefore, the punching and pulling explosion-proof parts provided in the embodiments of the present disclosure have the beneficial effects of being easy to process and manufacture, not affecting their own anti-rust coating, having flexible installation methods, and being highly convenient to install.

[0033] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0035] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0036] Figure 1 It shows a first structural diagram of the punch-pull explosion-proof provided by the embodiment of the present disclosure;

[0037] Figure 2 Shows Figure 1 A vertical section view of

[0038] Figure 3 A second structural diagram of the punch-pull explosion-proof device provided by an embodiment of the present disclosure is shown;

[0039] Figure 4 A third structural diagram of the punch-pull explosion-proof device provided by an embodiment of the present disclosure is shown;

[0040] Figure 5 A fourth structural diagram of the impact and pull explosion protection provided by an embodiment of the present disclosure is shown.

[0041] Explanation of the numbers in the figure: 1. explosion-proof part body; 2. punching and drawing structure; 21. first punching and drawing part; 211. center part; 212. first cylindrical part; 213. rectangular part; 214. first inclined part; 22. second punching and drawing part; 221. annular part; 222. second cylindrical part; 223. flat part; 224. second inclined part. DETAILED DESCRIPTION

[0042] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0043] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0044] Combination Figure 1 and Figure 2 As shown, an embodiment of the present disclosure provides a punching and pulling explosion-proof component, which includes an explosion-proof component body 1 and a punching and pulling structure 2; the punching and pulling structure 2 is recessed in the explosion-proof component body 1 along the thickness direction; the punching and pulling structure 2 is formed by stamping and / or drawing a part of the explosion-proof component body 1, and the structural strength of the punching and pulling structure 2 is less than the structural strength of other parts of the explosion-proof component body 1.

[0045] The punch-pull explosion-proof part can be specifically but not limited to being used for battery explosion-proofing, and this example is used to illustrate the use process.

[0046] During the specific processing and preparation of the punching and drawing explosion-proof component, the explosion-proof component body 1 can be directly subjected to a stamping process along the thickness direction, so as to realize a punching and drawing structure 2 with a recessed setting in the explosion-proof component body 1. Alternatively, a drawing process can be directly performed on one side of the explosion-proof component body 1, and a punching and drawing structure 2 with a recessed setting will be formed on the other opposite side of the explosion-proof component body 1. Alternatively, the stamping and drawing processes can be used in combination to process the above-mentioned punching and drawing structure 2.

[0047] The punch-pull explosion-proof component can be specifically but not limited to being installed at the pressure relief port in the battery pack. When high-pressure gas is accidentally generated inside the battery pack, since the structural strength of the punch-pull structure 2 is lower than the structural strength of other parts of the explosion-proof component body 1 (the structural strength includes but is not limited to tensile strength, yield strength, fracture strength, etc.), the punch-pull structure 2 will first crack under the top pressure of the high-pressure gas, allowing the high-pressure gas to be released and discharged, thereby playing an explosion-proof role for the battery pack.

[0048] Compared with the notched explosion-proof pieces in the prior art, the punched and pulled explosion-proof parts provided in the embodiments of the present disclosure will not generate metal debris during processing and manufacturing, nor will it affect the anti-rust coating on the surface of the explosion-proof part body 1; compared with the welded explosion-proof sheets in the prior art, there is no need to use welding technology during installation, and a variety of installation methods such as pasting, snap-on pressing, and threaded plug installation can be adopted during installation, and the installation is extremely convenient.

[0049] In summary, the punching and pulling explosion-proof parts provided in the embodiments of the present disclosure have the beneficial effects of being easy to process and manufacture, not affecting their own anti-rust coating, having flexible installation methods, and being highly convenient to install.

[0050] In one embodiment, the punching and pulling structure 2 includes a first punching and pulling portion 21 and a second punching and pulling portion 22; wherein the thickness of the first punching and pulling portion 21 is smaller than the thickness of the second punching and pulling portion 22, and the thickness of the second punching and pulling portion 22 is smaller than the thickness of the explosion-proof component body 1; and the second punching and pulling portion 22 is integrally connected to the outside of the first punching and pulling portion 21.

[0051] Specific, combined Figure 2 To further explain in detail, the punching and drawing structure 2 is specifically configured as a first punching and drawing part 21 and a second punching and drawing part 22, and the thickness of the first punching and drawing part 21 is limited to be smaller than the thickness of the second punching and drawing part 22, and the thickness of the second punching and drawing part 22 is smaller than the thickness of the explosion-proof component body 1. In this way, when processing and preparing the punching and drawing explosion-proof component, the second punching and drawing part 22 can be firstly processed and prepared by the primary stamping / drawing die process, and then the first punching and drawing part 21 can be prepared by the secondary stamping / drawing die process in the second punching and drawing part 22. In this way, the first punching and drawing part 21 with the smallest thickness and the second punching and drawing part 22 with the middle thickness can be obtained.

[0052] Since the first punching and pulling portion 21 has the smallest thickness and the highest explosion-proof response sensitivity, and the second punching and pulling portion 22 has a medium thickness and the second lowest explosion-proof response sensitivity, when high-pressure gas is initially generated inside the battery pack, the first punching and pulling portion 21 can respond first to produce cracks. If more high-pressure gas continues to be generated inside the battery pack, the second punching and pulling portion 22 can respond subsequently to produce cracks for a second time to further release pressure and exhaust gas.

[0053] The specific arrangement of the first punching and pulling portion 21 and the second punching and pulling portion 22 has the beneficial effects of simple structure, convenient processing and manufacturing, the ability to form two different explosion-proof response sensitivities, and adaptability to different usage scenarios.

[0054] Of course, the third punching and pulling part, the fourth punching and pulling part, etc. with thinner thickness may also be provided according to the explosion-proof grade of the battery pack.

[0055] In one possible implementation manner, the explosion-proof component body 1 is a circular sheet; the first punching and pulling portion 21 is located at the center of the explosion-proof component body 1 ; and the second punching and pulling portion 22 is concentrically arranged around the outer circumference of the first punching and pulling portion 21 .

[0056] Specific, combined Figure 1 and Figure 2 To further explain in detail, at this time, the first punching and pulling portion 21 is specifically arranged at the center of the explosion-proof component body 1, and the second punching and pulling portion 22 is concentrically arranged around the outer circumference of the first punching and pulling portion 21. In this way, the center of the explosion-proof component body 1 is the thinnest and the explosion-proof response sensitivity is the highest. When high-pressure gas is generated inside the battery pack, a circular hole-shaped crack will first be generated in the center of the explosion-proof component body 1, which can increase the area of ​​the pressure relief port to a certain extent and improve the exhaust efficiency to a certain extent.

[0057] In one embodiment, the first punching and pulling portion 21 includes a central portion 211 and a first cylindrical portion 212 arranged around the outer circumference of the central portion 211; along the radial direction from the inside to the outside of the punching and pulling explosion-proof component, the first cylindrical portion 212 is arranged to be a trumpet-shaped with a small inner opening and a large outer opening.

[0058] Specific, combined Figure 2 To further explain in detail, the first punching and pulling portion 21 is specifically configured to include a center portion 211 and a first cylindrical portion 212 arranged around the outer circumference of the center portion 211, and along the radial direction from the inside to the outside of the punching and pulling explosion-proof component, the first cylindrical portion 212 is configured to be a trumpet-shaped tube with a small inner opening and a large outer opening. In this way, the first punching and pulling portion 21 as a whole presents a shape similar to a "bowl mouth". The first cylindrical portion 212 with the thinnest thickness can produce an annular crack under the top pressure of the high-pressure gas, so that the center portion 211 falls off directly, thereby forming a maximized pressure relief port area and maximizing the exhaust efficiency within the shortest explosion-proof response time.

[0059] In one embodiment, the second punching and pulling portion 22 includes an annular portion 221 and a second cylindrical portion 222 arranged around the outer circumference of the annular portion 221; the annular portion 221 is arranged flush and connected to the outer opening of the first cylindrical portion 212; along the radial direction from the inside to the outside of the punching and pulling explosion-proof component, the second cylindrical portion 222 is arranged to be a trumpet shape with a small inner opening and a large outer opening.

[0060] Specific, combined Figure 2To further explain in detail, the second punching and pulling portion 22 is specifically configured to include an annular portion 221 and a second cylindrical portion 222 arranged around the outer circumference of the annular portion 221, and the annular portion 221 is flush and connected to the outer opening of the first cylindrical portion 212, and the second cylindrical portion 222 is radially arranged from the inside to the outside of the punching and pulling explosion-proof component into a trumpet shape with a small inner opening and a large outer opening. In this way, the second punching and pulling portion 22 as a whole can also present a shape similar to a "bowl mouth". When secondary high-pressure gas continues to be generated inside the battery pack, the second cylindrical portion 222, which is the second thickest, can also produce an annular crack under the top pressure of the secondary high-pressure gas, and can cause the first punching and pulling portion 21 to fall off directly as a whole, thereby forming an exhaust port with a larger area during the secondary pressure relief and exhaust.

[0061] In one embodiment, the explosion-proof body 1 is a rectangular sheet; the first punching and pulling portion 21 is located at the central axis of the explosion-proof body 1; and the second punching and pulling portions 22 are symmetrically arranged on both sides of the first punching and pulling portion 21.

[0062] Specific, combined Figure 3 To further explain in detail, the explosion-proof component body 1 is a rectangular sheet, and the first punching and pulling portion 21 is arranged at the central axis of the explosion-proof component body 1, which can be specifically the central axis in the width direction, so that the second punching and pulling portions 22 can be symmetrically arranged on both sides of the first punching and pulling portion 21 along the length direction. In this way, the central axis of the width of the explosion-proof component body 1 can be the thinnest and the explosion-proof response sensitivity can be the highest. When high-pressure gas is generated inside the battery pack, strip-shaped cracks will first be generated at the central axis of the width of the explosion-proof component body 1 for rapid discharge of the high-pressure gas.

[0063] In one embodiment, the first punching and drawing portion 21 includes a rectangular portion 213 and first inclined portions 214 symmetrically disposed on both sides of the rectangular portion 213 ; along a direction away from the rectangular portion 213 , the thickness of the first inclined portions 214 is configured to gradually increase.

[0064] Specific, combined Figure 3 To further explain in detail, the first punching and pulling portion 21 specifically includes a rectangular portion 213 and first inclined portions 214 on both sides of the symmetrical rectangular portion 213, and the thickness of the first inclined portion 214 is set to gradually increase, so that the rectangular portion 213 in the first punching and pulling portion 21 is the thinnest and is most likely to produce cracks under the top pressure of high-pressure gas. The thinnest rectangular portion 213 can also improve the explosion-proof response sensitivity of the punching and pulling explosion-proof component to a certain extent.

[0065] In one embodiment, the second punching and drawing portion 22 includes a flat portion 223 and a second inclined portion 224 located on one side of the flat portion 223 ; the thickness of the second inclined portion 224 is configured to gradually increase in a direction away from the rectangular portion 213 .

[0066] Specific, combined Figure 3To further explain in detail, the second punching and pulling portion 22 is specifically configured to include a flat portion 223 and a second inclined portion 224 located on one side of the flat portion 223, and the thickness of the second inclined portion 224 is configured to gradually increase in the direction away from the rectangular portion 213. In this way, when secondary high-pressure gas continues to be generated inside the battery pack, the flat portion 223 with the second largest thickness can also produce strip-shaped cracks under the top pressure of the secondary high-pressure gas, and can make the first punching and pulling portion 21 fall off directly as a whole, thereby forming a larger exhaust port during the secondary pressure relief and exhaust.

[0067] In one possible implementation manner, punching and drawing structures 2 are respectively provided in corresponding depressions on both sides of the rectangular sheet along the thickness direction of the rectangular sheet.

[0068] Specific, combined Figure 4 Further detailed description, the punching and pulling structures 2 are respectively recessed on both sides of the rectangular sheet along the thickness direction of the rectangular sheet, so that the two punching and pulling structures 2 recessed towards each other can form a rectangular explosion-proof response area with the thinnest thickness at the center line of the explosion-proof component body 1, further improving the explosion-proof sensitivity of the punching and pulling explosion-proof component.

[0069] In one possible implementation, among the two punching and pulling structures 2, one is arranged along the central axis of the length direction of one side of the rectangular sheet, and the other is arranged along the central axis of the width direction of the other side of the rectangular sheet.

[0070] Specific, combined Figure 4 To further explain in detail, two punching and pulling structures 2 are arranged, one along the central axis of the length direction of one side of the rectangular sheet, and the other along the central axis of the width direction of the other side of the rectangular sheet. In this way, the two punching and pulling structures 2 arranged back to back in the vertical and horizontal directions can form a cross-shaped thinnest explosion-proof response part in the rectangular sheet, and can also further improve the explosion-proof sensitivity of the punching and pulling explosion-proof component.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0072] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A punching and pulling explosion-proof part, characterized in that: It comprises an explosion-proof component body (1) and a punching and pulling structure (2); The punching and pulling structure (2) is recessed in the explosion-proof component body (1) along the thickness direction; The punching and drawing structure (2) is formed by stamping and / or drawing a part of the explosion-proof component body (1), and the structural strength of the punching and drawing structure (2) is lower than the structural strength of other parts of the explosion-proof component body (1).

2. The punch-pull explosion-proof component according to claim 1, characterized in that: The punching and drawing structure (2) comprises a first punching and drawing portion (21) and a second punching and drawing portion (22); Wherein, the thickness of the first punching and pulling portion (21) is smaller than the thickness of the second punching and pulling portion (22), and the thickness of the second punching and pulling portion (22) is smaller than the thickness of the explosion-proof component body (1); Furthermore, the second punching and pulling portion (22) is integrally connected to the outside of the first punching and pulling portion (21).

3. The punching and pulling explosion-proof component according to claim 2 is characterized in that: The explosion-proof component body (1) is a circular sheet; The first punching and pulling portion (21) is located at the center of the explosion-proof component body (1); The second punching and pulling portion (22) is coaxially arranged around the outer periphery of the first punching and pulling portion (21).

4. The punching and pulling explosion-proof component according to claim 3 is characterized in that: The first punching and drawing portion (21) comprises a central portion (211) and a first cylindrical portion (212) arranged around the outer circumference of the central portion (211); Along the radial direction from the inside to the outside of the punch-pull explosion-proof component, the first cylindrical portion (212) is configured to be in the shape of a trumpet with a small inner opening and a large outer opening.

5. The punching and pulling explosion-proof component according to claim 4 is characterized in that: The second punching and drawing portion (22) comprises a circular ring portion (221) and a second cylindrical portion (222) arranged around the outer circumference of the circular ring portion (221); The annular portion (221) is flushly arranged and connected to the outer opening of the first cylindrical portion (212); Along the radial direction from the inside to the outside of the punch-pull explosion-proof component, the second cylindrical portion (222) is configured to be in the shape of a trumpet with a small inner opening and a large outer opening.

6. The punching and pulling explosion-proof component according to claim 2, characterized in that: The explosion-proof component body (1) is a rectangular sheet; The first punching and pulling portion (21) is located at the central axis of the explosion-proof component body (1); The second punching and pulling parts (22) are symmetrically arranged on both sides of the first punching and pulling part (21).

7. The punching and pulling explosion-proof component according to claim 6, characterized in that: The first punching and pulling portion (21) comprises a rectangular portion (213) and first inclined portions (214) symmetrically disposed on both sides of the rectangular portion (213); The thickness of the first inclined portion (214) is configured to gradually increase in a direction away from the rectangular portion (213).

8. The punching and pulling explosion-proof component according to claim 7, characterized in that: The second punching and pulling portion (22) comprises a flat portion (223) and a second inclined portion (224) located on one side of the flat portion (223); The thickness of the second inclined portion (224) is configured to gradually increase in a direction away from the rectangular portion (213).

9. The punch-pull explosion-proof component according to claim 6, characterized in that: Along the thickness direction of the rectangular sheet, the punching and pulling structures (2) are respectively provided in corresponding depressions on both sides of the rectangular sheet.

10. The punching and pulling explosion-proof component according to claim 9, characterized in that: Of the two punching and pulling structures (2), one is arranged along the central axis of the length direction of one side of the rectangular sheet, and the other is arranged along the central axis of the width direction of the other side of the rectangular sheet.

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