A power battery explosion-proof valve structure and its processing technology

Abstract

The present invention discloses a power battery explosion-proof valve structure and a processing technology thereof, including a top cover sheet and an explosion-proof sheet arranged on the top cover sheet, an explosion-proof notch is arranged between the explosion-proof sheet and the top cover sheet, and a reinforcing rib is arranged on the explosion-proof sheet, and the reinforcing rib includes a first reinforcing rib and a second reinforcing rib, wherein the first reinforcing rib and the second reinforcing rib are both annular closed curves, the first reinforcing rib is arranged around the outer side of the periphery of the explosion-proof notch, and the second reinforcing rib is arranged around the outer side of the third reinforcing rib. The annularly closed first and second reinforcing ribs form a closed-loop force system, which is uniformly stressed and has no stress concentration point. When the residual stress is eliminated in the annealing process, the first and second reinforcing ribs form multiple stress elimination layers, so that the residual stress is released multiple times, avoiding the occurrence of bulging / wrinkling, and ensuring the air tightness of the product.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular to a power battery explosion-proof valve structure and a processing technology thereof. Background Art

[0002] Power batteries refer to batteries that provide power for pure electric vehicles, plug-in hybrid vehicles, electric bicycles and other equipment. Currently, most power batteries use lithium batteries encapsulated in aluminum shells. The explosion-proof valve is a thin-walled valve body on the battery sealing plate. When the internal pressure of the battery exceeds the specified value, the explosion-proof valve body ruptures to prevent the battery from bursting.

[0003] The prior art application number is 201721746877.0, which is a power top cover explosion-proof structure. A reinforcing rib is arranged in the middle to improve the force buffering performance. However, the intersection of the three reinforcing ribs will form a stress concentration point. When annealing is performed to eliminate the stress, the intersection of the three reinforcing ribs will be subjected to uneven force, causing bulging, thereby affecting the air tightness of the explosion-proof valve.

[0004] In view of this, it is necessary to provide a battery explosion-proof valve structure with reinforcing ribs that can fully eliminate the stress during annealing and have uniform force without bulging / wrinkling, which has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to provide a power battery explosion-proof valve structure to solve the above technical problems.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A power battery explosion-proof valve structure comprises a top cover sheet and an explosion-proof sheet, wherein the top cover sheet is arranged around the outside of the explosion-proof sheet, and the periphery of the explosion-proof sheet is provided with an explosion-proof notch, and further comprises a first reinforcing rib arranged around the outside of the explosion-proof notch and a second reinforcing rib arranged inside the explosion-proof notch; the first reinforcing rib and the second reinforcing rib are both annular closed structures.

[0008] Optionally, it further includes a third reinforcing rib of an annular closed structure, wherein the third reinforcing rib is sleeved on the inner side of the second reinforcing rib.

[0009] Optionally, the depths of the first reinforcing rib, the second reinforcing rib and the third reinforcing rib are all less than the depth of the explosion-proof notch.

[0010] Optionally, the first reinforcing rib, the second reinforcing rib and the third reinforcing rib are in a runway shape.

[0011] Optionally, the explosion-proof notch is an annular notch, and a safety position is reserved in the explosion-proof notch.

[0012] Optionally, the top cover sheet and the explosion-proof sheet are integrally stamped and formed.

[0013] A processing technology for a power battery explosion-proof valve structure, applied to processing the power battery explosion-proof valve structure as claimed in any one of claims 1 to 4, characterized in that it comprises:

[0014] The first step is to perform stamping processing on the aluminum raw material to form a preliminary blank of the explosion-proof disk;

[0015] The second step is to perform hydrocarbon cleaning on the explosion-proof disc blank at a cleaning temperature of 10 to 40° C. to form an explosion-proof disc blank with oil removed;

[0016] The third step is to place the explosion-proof disc blank from which oil stains have been removed into a high-temperature oven for annealing at a temperature of 350-450° C. for 30 minutes to form a finished explosion-proof valve from which stress has been removed.

[0017] Optionally, the first step further includes: performing a burst test on the burst-proof disc blank, with a burst pressure value of 0.4 to 1.45 MPa, so as to eliminate the burst-proof disc blank with a burst pressure value that does not meet the standard.

[0018] Compared with the prior art, the present invention has the following beneficial effects: compared with the reinforcing ribs on the traditional explosion-proof valve, the first reinforcing rib and the second reinforcing rib are arranged in sequence in an annular closed structure; the first reinforcing rib and the second reinforcing rib form multiple stress relief layers, so that the residual stress inside and outside the explosion-proof notch on the explosion-proof valve is fully eliminated, and there is no intersection between the two, the force is uniform, and there is no stress concentration point. When the residual stress is eliminated in the annealing process, bulging / wrinkling is avoided, thereby ensuring the air tightness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0021] Figure 1It is a structural schematic diagram of the explosion-proof valve structure of the power battery;

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the power battery explosion-proof valve structure AA;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the power battery explosion-proof valve structure at BB.

[0024] Illustration: top cover sheet 1, explosion-proof sheet 2, explosion-proof notch 21, first reinforcing rib 22, second reinforcing rib 23, third reinforcing rib 24, safety position 25. DETAILED DESCRIPTION

[0025] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0027] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0028] An embodiment of the present invention provides a power battery explosion-proof valve structure, including a top cover sheet 1 and an explosion-proof sheet 2 arranged on the top cover sheet, the top cover sheet 1 and the explosion-proof sheet 2 are both made of aluminum material, and the top cover sheet 1 and the explosion-proof sheet 2 are integrally stamped.

[0029] An explosion-proof notch 21 is provided between the explosion-proof plate 2 and the top cover plate 1, and reinforcing ribs are provided on the explosion-proof plate 2, and the reinforcing ribs include a first reinforcing rib 22, a second reinforcing rib 23 and a third reinforcing rib 24. The first reinforcing rib 22, the second reinforcing rib 23 and the third reinforcing rib 24 are all annular closed curves, the first reinforcing rib 22 is arranged around the outer side of the periphery of the explosion-proof notch 21, and the second reinforcing rib 23 is arranged around the outer side of the third reinforcing rib 24.

[0030] Compared with the traditional reinforcing ribs, the first reinforcing rib 22, the second reinforcing rib 23 and the third reinforcing rib 24 are annular closed structures arranged in sequence, with no intersections between the three, uniform force, and no stress concentration points. When the residual stress is eliminated in the annealing process, the first reinforcing rib 22, the second reinforcing rib 23 and the third reinforcing rib 24 form multiple stress elimination layers, so that the residual stress is released multiple times, avoiding the occurrence of bulging / wrinkling, and ensuring the air tightness of the product. Among them, the first reinforcing rib 22 is arranged on the outer side of the periphery of the explosion-proof notch 21. The first reinforcing rib 22 can eliminate the stress of the top cover sheet 1 during the annealing process to avoid deformation of the explosion-proof notch 21.

[0031] The explosion-proof notch 21 is an annular notch, and a safety position 25 is reserved on the explosion-proof notch 21, wherein the safety position 25 refers to a spacing position at one end reserved on the explosion-proof notch 21, and the spacing position is a reserved part on the annular line where the explosion-proof notch 21 is located, and no explosion-proof notch 21 is set. When the power battery explodes at a certain pressure value, the explosion-proof sheet 2 ruptures along the explosion-proof notch 21 and tilts relative to the top cover sheet 1, and the explosion-proof sheet 2 and the top cover sheet 1 always remain connected at the connection part of the safety position 25, and the explosion-proof sheet 2 and the top cover sheet 1 will not be directly separated and opened, thereby ensuring the safety performance of the explosion-proof sheet 2 when it explodes.

[0032] In this embodiment, the shape of the explosion-proof disk 2 can be any one of square, rectangular, circular, polygonal, and elliptical, and the explosion-proof notches 21 and the reinforcing ribs correspond to the shape of the explosion-proof disk 2 .

[0033] In this embodiment, the reinforcing ribs also include the fourth reinforcing rib, the fifth reinforcing rib ... the Nth reinforcing rib, which are all annular closed curves, wherein N is any natural number greater than 2. The number of reinforcing ribs on the explosion-proof plate 2 can be adjusted according to actual production needs to adapt to the force buffering requirements of explosion-proof plates 2 of different sizes.

[0034] A processing technology for a power battery explosion-proof valve structure, applied to processing a power battery explosion-proof valve structure according to any one of claims 1 to 4, characterized in that it comprises:

[0035] The first step is to perform stamping processing on the aluminum raw material to form a preliminary blank of the explosion-proof disk;

[0036] The second step is to perform hydrocarbon cleaning on the explosion-proof disc blank at a cleaning temperature of 10 to 40° C. to form an explosion-proof disc blank with oil removed;

[0037] The third step is to place the explosion-proof disc blank from which oil stains have been removed into a high-temperature oven for annealing at a temperature of 350-450° C. for 30 minutes to form a finished explosion-proof valve from which stress has been removed.

[0038] Furthermore, the first step also includes: performing a burst test on the explosion-proof disc blanks, with a burst pressure value of 0.4 to 1.45 MPa, so as to eliminate the explosion-proof disc blanks whose burst pressure values ​​do not meet the standards.

[0039] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power battery explosion-proof valve structure, comprising a top cover sheet (1) and an explosion-proof sheet (2), wherein the top cover sheet (1) is arranged around the outside of the explosion-proof sheet (2), and the periphery of the explosion-proof sheet (2) is provided with explosion-proof notches (21), characterized in that: It also includes a first reinforcing rib (22) arranged around the outside of the explosion-proof notch (21) and a second reinforcing rib (23) arranged inside the explosion-proof notch (21); the first reinforcing rib (22) and the second reinforcing rib (23) are both annular closed structures; It also includes a third reinforcing rib (24) of an annular closed structure, wherein the third reinforcing rib (24) is sleeved on the inner side of the second reinforcing rib (23); The explosion-proof notch (21) is an annular notch, and a safety position (25) is reserved in the explosion-proof notch (21).

2. A power battery explosion-proof valve structure according to claim 1, characterized in that: Furthermore, the depths of the first reinforcing rib (22), the second reinforcing rib (23) and the third reinforcing rib (24) are all less than the depth of the explosion-proof notch (21).

3. The power battery explosion-proof valve structure according to claim 1, characterized in that: The first reinforcing rib (22), the second reinforcing rib (23) and the third reinforcing rib (24) are in a racetrack shape.

4. The power battery explosion-proof valve structure according to claim 1, characterized in that: The top cover sheet (1) and the explosion-proof sheet (2) are integrally stamped and formed.

5. A processing technology for a power battery explosion-proof valve structure, applied to processing the power battery explosion-proof valve structure according to any one of claims 1 to 4, characterized in that: include: The first step is to perform stamping processing on the aluminum raw material to form a preliminary blank of the explosion-proof disk; The second step is to perform hydrocarbon cleaning on the explosion-proof disc blank at a cleaning temperature of 10 to 40° C. to form an explosion-proof disc blank with oil removed; The third step is to place the explosion-proof disc blank from which oil stains have been removed into a high-temperature oven for annealing at a temperature of 350-450° C. for 30 minutes to form a finished explosion-proof valve from which stress has been removed.

6. The processing technology of the power battery explosion-proof valve structure according to claim 5 is characterized in that: The first step also includes: performing a burst test on the burst-proof disc blank, with a burst pressure value of 0.4-1.45 MPa, so as to eliminate the burst-proof disc blank with a burst pressure value that does not meet the standard.

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