Pressure release valve, battery top cover, integrated battery shell and battery

Abstract

The utility model relates to a pressure release valve, a battery top cover, an integrated battery shell and a battery, the pressure release valve comprises a body part and a pressure release part, a bursting groove is formed between the pressure release part and the body part, the bursting groove is constructed to be formed by laser engraving and machining, and the pressure release part is constructed to be formed in the mode that when the internal pressure of the pressure release valve is larger than the external pressure of the pressure release valve, the bursting groove is formed by laser engraving and machining. When the pressure relief valve is opened, the bursting groove between the pressure relief part and the body part is broken, the pressure relief part moves relative to the body part to form a pressure relief gap, and therefore the pressure on the inner side of the pressure relief valve is relieved. In the machining process of the pressure release valve, the bursting groove can be machined through the laser engraving technology, in this way, stripping can be conducted through the laser direct alignment principle in the machining process, mechanical extrusion or mechanical stress cannot be caused to raw materials, and therefore the overall shape of the obtained pressure release valve is more accurate, and the size of machined finished products is more consistent; therefore, the machining yield of the obtained pressure release valve can be effectively improved, and the machining cost is saved.

Description

Technical Field

[0001] The present disclosure relates to the field of power batteries, and more precisely, to a pressure relief valve; the present disclosure also relates to a power battery. Background Art

[0002] With the development of the new energy industry, market demand for various batteries, including lithium-ion batteries, is increasing. Pressure relief valves are crucial components in batteries. During battery use, high-temperature, high-pressure gases may form. When excessive pressure builds up inside the battery cell, the pressure relief valve automatically opens to relieve pressure, preventing explosions and other potential hazards. This effectively eliminates dangers and enhances battery safety.

[0003] However, in the existing battery pressure relief valve processing process, most of them adopt stamping process, which is not only cumbersome but also the resulting product cannot meet safety requirements. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the present disclosure provides a pressure relief valve, a battery top cover, an integrated battery housing and a battery.

[0005] According to a first aspect of the present disclosure, there is provided a pressure relief valve, comprising:

[0006] Body part;

[0007] A pressure relief portion, wherein a bursting groove is formed between the pressure relief portion and the main body portion, and the bursting groove is constructed to be formed by laser precision engraving. The pressure relief portion is constructed so that when the internal pressure of the pressure relief valve is greater than the external pressure of the pressure relief valve, the bursting groove between the pressure relief portion and the main body portion ruptures, and the pressure relief portion moves relative to the main body portion to form a pressure relief gap, thereby releasing the internal pressure of the pressure relief valve.

[0008] In one embodiment of the present disclosure, the overall depth of the burst groove is configured to range from 0.1 mm to 0.2 mm.

[0009] In one embodiment of the present disclosure, the longitudinal section of the bursting groove is configured as a square groove.

[0010] In one embodiment of the present disclosure, the bursting groove is configured to be formed on the outer side of the pressure relief valve; and a portion of the inner side of the pressure relief valve corresponding to the bursting groove is configured to be a plane.

[0011] In one embodiment of the present disclosure, the bursting groove is configured to have an overall contour in the shape of a smooth arc.

[0012] In one embodiment of the present disclosure, the bursting groove includes a straight line segment and arc segments located on both sides of the straight line segment.

[0013] In one embodiment of the present disclosure, the bursting groove is partially formed between the main body portion, the pressure relief portion and the main body portion, and the main body portion is partially connected integrally.

[0014] According to a second aspect of the present disclosure, there is provided a battery top cover, comprising:

[0015] a substrate, wherein a mounting hole is provided on the substrate;

[0016] The pressure relief valve is configured to be mounted on the mounting hole, and a body portion of the pressure relief valve is sealed and connected to an edge of the mounting hole.

[0017] According to a third aspect of the present disclosure, there is provided an integrated battery housing, comprising:

[0018] A main body portion, wherein a receiving cavity is provided in the main body portion;

[0019] A pressure relief portion, wherein a bursting groove is formed between the pressure relief portion and the main body portion, and the bursting groove is constructed to be formed by laser precision engraving. The pressure relief portion is constructed so that when the internal pressure of the accommodating cavity is greater than the external pressure of the pressure relief valve, the bursting groove between the pressure relief portion and the main body portion ruptures, and the pressure relief portion moves relative to the main body portion to form a pressure relief gap, thereby releasing the internal pressure of the accommodating cavity.

[0020] According to a fourth aspect of the present disclosure, a battery is provided, comprising at least one of the pressure relief valve, the battery top cover, and the integrated battery housing.

[0021] The present disclosure provides a pressure relief valve, which can be applied to structures such as batteries. The pressure relief valve specifically includes a main body and a pressure relief part, wherein a bursting groove is formed between the pressure relief part and the main body, and the bursting groove is constructed to be formed by laser precision carving. The pressure relief part is constructed so that when the internal pressure of the pressure relief valve is greater than the external pressure of the pressure relief valve, the bursting groove between the pressure relief part and the main body ruptures, and the pressure relief part moves relative to the main body to form a pressure relief gap, thereby releasing the internal pressure of the pressure relief valve.

[0022] In this way, during the processing of the pressure relief valve disclosed in the present invention, the burst groove can be processed using a laser precision engraving process. In this way, the laser can be used to directly peel off the principle during the processing, and no mechanical extrusion or mechanical stress will be caused to the raw material, thereby making the overall shape of the obtained pressure relief valve more precise and the size of the finished product more consistent, thereby effectively improving the processing yield of the obtained pressure relief valve and saving processing costs.

[0023] During the use of the pressure relief valve disclosed herein, when the internal pressure of the pressure relief valve is greater than the external pressure of the pressure relief valve, since the bursting groove is formed by laser engraving, the material inside the pressure relief valve can squeeze the bursting groove between the pressure relief part and the main body to rupture it, and after the pressure relief part moves relative to the main body, a pressure relief gap can be formed between the main body and the pressure relief part. The material inside the pressure relief valve can be discharged from the pressure relief gap, thereby releasing the internal pressure of the pressure relief valve to prevent the overall explosion caused by excessive internal pressure, effectively eliminating danger and improving the structural safety of the pressure relief valve.

[0024] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] Figure 1 is a three-dimensional diagram of an integrated battery housing and a pressure relief valve provided in an embodiment of the present disclosure;

[0027] Figure 2 is a front view of an integrated battery housing and a pressure relief valve provided in an embodiment of the present disclosure;

[0028] Figure 3 is a front view of an integrated battery housing and a pressure relief valve provided in an embodiment of the present disclosure;

[0029] Figures 1 to 3 The corresponding relationship between the component names and reference numerals is as follows:

[0030] 10. Pressure relief valve; 11. Main body; 12. Pressure relief portion; 13. Burst groove; 20. Battery top cover; 30. Integrated battery housing. DETAILED DESCRIPTION

[0031] Otherwise the relative arrangement of parts and steps, numerical expressions and numerical values of setting forth in these embodiments do not limit the scope of the present disclosure.In all examples shown and discussed here, any concrete value should be interpreted as merely exemplary, rather than as restriction.Therefore, other examples of exemplary embodiments can have different values.

[0032] The following description sets forth numerous specific details to facilitate a thorough understanding of the present disclosure. However, the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art may make similar generalizations without violating the scope of the present disclosure. Therefore, the present disclosure is not limited to the specific implementations disclosed below. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but, where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0033] The terms used in one or more embodiments of the present disclosure are for the purpose of describing specific embodiments only and are not intended to limit one or more embodiments of the present disclosure. The singular forms "a", "the", and "the" used in one or more embodiments of the present disclosure and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in one or more embodiments of the present disclosure refers to and includes any or all possible combinations of one or more associated listed items.

[0034] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of the present disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of one or more embodiments of the present disclosure, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determination". In this article, "upper", "lower", "front", "back", "left", "right", etc. are only used to indicate the relative positional relationship between the relevant parts, rather than to limit the absolute position of these relevant parts. In this article, "equal", "same", etc. are not strict mathematical and / or geometric limitations, but also include errors that can be understood by those skilled in the art and are allowed by manufacturing or use. Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints, but also several sub-ranges contained therein.

[0035] The present disclosure provides a pressure relief valve, which can be applied to structures such as batteries. The pressure relief valve specifically includes a main body and a pressure relief part, wherein a bursting groove is formed between the pressure relief part and the main body, and the bursting groove is constructed to be formed by laser precision carving. The pressure relief part is constructed so that when the internal pressure of the pressure relief valve is greater than the external pressure of the pressure relief valve, the bursting groove between the pressure relief part and the main body ruptures, and the pressure relief part moves relative to the main body to form a pressure relief gap, thereby releasing the internal pressure of the pressure relief valve.

[0036] In this way, during the processing of the pressure relief valve disclosed in the present invention, the burst groove can be processed using a laser precision engraving process. In this way, the laser can be used to directly peel off the principle during the processing, and no mechanical extrusion or mechanical stress will be caused to the raw material, thereby making the overall shape of the obtained pressure relief valve more precise and the size of the finished product more consistent, thereby effectively improving the processing yield of the obtained pressure relief valve and saving processing costs.

[0037] During the use of the pressure relief valve disclosed herein, when the internal pressure of the pressure relief valve is greater than the external pressure of the pressure relief valve, since the bursting groove is formed by laser engraving, the material inside the pressure relief valve can squeeze the bursting groove between the pressure relief part and the main body to rupture it, and after the pressure relief part moves relative to the main body, a pressure relief gap can be formed between the main body and the pressure relief part. The material inside the pressure relief valve can be discharged from the pressure relief gap, thereby releasing the internal pressure of the pressure relief valve to prevent the overall explosion caused by excessive internal pressure, effectively eliminating danger and improving the structural safety of the pressure relief valve.

[0038] For ease of understanding, refer to Figures 1 to 3 The specific structure and working principle of the pressure relief valve of the present disclosure are described in detail with reference to an embodiment. It should be noted that the present disclosure also provides a battery cover, an integrated battery housing, and a battery. To keep the text concise, the pressure relief valve is described together with the battery cover, the integrated battery housing, and the battery.

[0039] like Figure 1 and Figure 2 As shown, the present disclosure provides a pressure relief valve 10, which can be applied to structures such as batteries, and specifically includes a main body 11 and a pressure relief portion 12, wherein a bursting groove 13 is formed between the pressure relief portion 12 and the main body 11, and the bursting groove 13 is constructed to be formed by laser precision carving. The pressure relief portion 12 is constructed so that when the internal pressure of the pressure relief valve 10 is greater than the external pressure of the pressure relief valve 10, the bursting groove 13 between the pressure relief portion 12 and the main body 11 ruptures, and the pressure relief portion 12 moves relative to the main body 11 to form a pressure relief gap, thereby releasing the internal pressure of the pressure relief valve 10.

[0040] In this way, during the processing of the pressure relief valve 10 disclosed in the present invention, the bursting groove 13 can be processed using a laser engraving process. In this way, the laser can be used to directly peel the raw material during the processing, and no mechanical extrusion or mechanical stress will be caused to the raw material, thereby making the overall shape of the obtained pressure relief valve 10 more precise and the size of the finished product more consistent, thereby effectively improving the processing yield of the obtained pressure relief valve 10 and saving processing costs.

[0041] During the use of the pressure relief valve 10 disclosed in the present invention, when the internal pressure of the pressure relief valve 10 is greater than the external pressure of the pressure relief valve 10, since the bursting groove 13 is formed by laser engraving, the material inside the pressure relief valve 10 can squeeze the bursting groove 13 between the pressure relief part 12 and the main body 11 to rupture, and the pressure relief part 12 can form a pressure relief gap between the main body 11 and the pressure relief part 12 after moving relative to the main body 11. The material inside the pressure relief valve 10 can be discharged from the pressure relief gap, thereby releasing the internal pressure of the pressure relief valve 10 to prevent the overall explosion caused by excessive internal pressure, effectively eliminating danger, and improving the structural safety of the pressure relief valve 10.

[0042] Specifically, the pressure relief valve 10 of the present disclosure can be processed using a 50W infrared picosecond laser. In one embodiment of the present disclosure, the processing power is 45W, the moving speed is 5000mm / s, the defocus is 1mm, and the engraving time for a single product is 37.67s. The entire processing process of the pressure relief valve 10 of the present disclosure can include laser blanking, sheet metal bending, blue film removal, laser welding, helium testing, corner cutting, laser precision engraving of the burst groove 13, cleaning, appearance inspection, packaging and warehousing, etc. This process can refer to the existing pressure relief valve 10 processing process and will not be repeated here.

[0043] like Figure 1 As shown, in one embodiment of the present disclosure, the overall depth range of the bursting groove 13 is constructed to be 0.1mm to 0.2mm. Compared to the bursting groove 13 structure obtained by the stamping process, because the bursting groove 13 in the pressure relief valve 10 of the present disclosure is formed by laser precision engraving, the overall depth range of the bursting groove 13 can be within the range of 0.1mm to 0.2mm, thereby effectively reducing the overall depth of the bursting groove 13, thereby increasing the bursting sensitivity of the bursting groove 13, ensuring that the bursting groove 13 can burst in a timely manner, and avoiding the situation where the internal pressure of the pressure relief valve 10 is high but the bursting groove 13 does not burst, thereby further improving the structural safety of the pressure relief valve 10.

[0044] like Figure 1 As shown, in one embodiment of the present disclosure, the longitudinal section of the bursting groove 13 is configured as a square groove. Compared to the bursting groove 13 with a V-shape or other shapes obtained by the stamping process, the square-shaped bursting groove 13 of the present disclosure can also improve the bursting sensitivity of the bursting groove 13, ensuring that the bursting groove 13 can burst in a timely manner, avoiding the situation where the internal pressure of the pressure relief valve 10 is high but the bursting groove 13 does not burst, thereby further improving the structural safety of the pressure relief valve 10.

[0045] like Figure 1As shown, in one embodiment of the present disclosure, the bursting groove 13 is formed on the outer side of the pressure relief valve 10; the portion of the inner side of the pressure relief valve 10 corresponding to the bursting groove 13 is configured as a flat surface. Because the bursting groove 13 in the pressure relief valve 10 of the present disclosure is formed by laser engraving, the bursting groove 13 can be formed on the outer side of the pressure relief valve 10, and the portion of the inner side of the pressure relief valve 10 corresponding to the bursting groove 13 is configured as a flat surface, which does not affect the internal structure of the pressure relief valve 10.

[0046] like Figure 1 As shown, in one embodiment of the present disclosure, the bursting groove 13 is constructed with an overall contour that is a smooth arc. Because the overall contour of the bursting groove 13 is a smooth arc, when the internal pressure of the pressure relief valve 10 is greater than the external pressure of the pressure relief valve 10, the material inside the pressure relief valve 10 can squeeze the bursting groove 13 between the pressure relief portion 12 and the main body 11, causing it to rupture uniformly throughout, thereby forming an integral pressure relief gap. The situation where some bursting grooves 13 rupture while others do not rupture will not occur, thereby effectively ensuring the pressure relief performance of the pressure relief valve 10 of the present disclosure and improving the structural safety of the pressure relief valve 10.

[0047] Specifically, such as Figure 1 As shown, in one embodiment of the present disclosure, the bursting groove 13 includes a straight line segment and arc segments located on both sides of the straight line segment, that is, Figure 1 As shown, the bursting groove 13 of the present disclosure can be C-shaped. In this way, during the use of the pressure relief valve 10 of the present disclosure, after the bursting groove 13 is ruptured as a whole under pressure, an O-shaped pressure relief port can be formed to ensure that the material inside the pressure relief valve 10 can be quickly discharged from the O-shaped pressure relief port, thereby quickly releasing the internal pressure of the pressure relief valve 10, further improving the pressure relief performance of the pressure relief valve 10 of the present disclosure.

[0048] Furthermore, in one embodiment of the present disclosure, a bursting groove 13 is formed between the main body 11 and the pressure relief portion 12, and the main body 11 is partially integrally connected. Thus, during use of the pressure relief valve 10 of the present disclosure, after the bursting groove 13 is ruptured under pressure, forming an O-shaped pressure relief port, the pressure relief portion 12 and the main body 11 will not completely separate, thereby preventing the pressure relief portion 12 from colliding with other structures after separation from the main body 11, thereby improving the structural safety of the pressure relief valve 10.

[0049] like Figure 3 As shown, the present disclosure provides a battery top cover 20, comprising:

[0050] A base plate, wherein a mounting hole is provided on the base plate;

[0051] The pressure relief valve 10 is configured to be mounted on a mounting hole, and the body 11 of the pressure relief valve 10 is sealed and connected to an edge of the mounting hole.

[0052] After the battery top cover 20 of the present disclosure is applied to the battery, when the internal pressure of the pressure relief valve 10 is greater than the external pressure of the pressure relief valve 10, since the bursting groove 13 is formed by laser engraving, the material inside the pressure relief valve 10 can squeeze the bursting groove 13 between the pressure relief portion 12 and the main body 11 to rupture, and the pressure relief portion 12 can form a pressure relief gap between the main body 11 and the pressure relief portion 12 after moving relative to the main body 11. The material inside the pressure relief valve 10 can be discharged from the pressure relief gap, thereby releasing the internal pressure of the pressure relief valve 10 to prevent the entire valve from exploding due to excessive internal pressure, effectively eliminating danger, and improving the structural safety of the pressure relief valve 10.

[0053] like Figure 1 and Figure 2 As shown, the present disclosure provides an integrated battery housing 30, comprising:

[0054] The main body 11 has a receiving cavity formed therein;

[0055] The pressure relief portion 12 has a bursting groove 13 formed between the pressure relief portion 12 and the main body 11. The bursting groove 13 is constructed by laser engraving. The pressure relief portion 12 is constructed so that when the internal pressure of the accommodating chamber is greater than the external pressure of the pressure relief valve 10, the bursting groove 13 between the pressure relief portion 12 and the main body 11 ruptures, and the pressure relief portion 12 moves relative to the main body 11 to form a pressure relief gap, thereby releasing the internal pressure of the accommodating chamber.

[0056] After the integrated battery shell 30 disclosed in the present invention is applied to the battery, when the internal pressure of the pressure relief valve 10 is greater than the external pressure of the pressure relief valve 10, since the bursting groove 13 is formed by laser engraving, the material inside the pressure relief valve 10 can squeeze the bursting groove 13 between the pressure relief part 12 and the main body 11 to rupture, and the pressure relief part 12 can form a pressure relief gap between the main body 11 and the pressure relief part 12 after moving relative to the main body 11. The material inside the pressure relief valve 10 can be discharged from the pressure relief gap, thereby releasing the internal pressure of the pressure relief valve 10 to prevent the overall explosion caused by excessive internal pressure, effectively eliminating danger, and improving the structural safety of the pressure relief valve 10.

[0057] The present disclosure further provides a battery, characterized by comprising at least one of the aforementioned pressure relief valve 10 , the aforementioned battery top cover 20 , and the aforementioned battery casing.

[0058] During the operation of the battery disclosed herein, when the internal pressure of the pressure relief valve 10 is greater than the external pressure of the pressure relief valve 10, since the bursting groove 13 is formed by laser engraving, the material inside the pressure relief valve 10 can squeeze the bursting groove 13 between the pressure relief portion 12 and the main body 11 to rupture, and the pressure relief portion 12 can form a pressure relief gap between the main body 11 and the pressure relief portion 12 after moving relative to the main body 11. The material inside the pressure relief valve 10 can be discharged from the pressure relief gap, thereby releasing the internal pressure of the pressure relief valve 10 to prevent the entire valve from exploding due to excessive internal pressure, effectively eliminating danger, and improving the structural safety of the pressure relief valve 10.

[0059] The embodiments of the present disclosure have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terms used herein are selected to best explain the principles of the embodiments, their practical applications, or technical improvements in the marketplace, or to enable other persons skilled in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A pressure relief valve (10), characterized in that: include: Body part(11); A pressure relief portion (12) is provided, wherein a bursting groove (13) is formed between the pressure relief portion (12) and the main body (11), wherein the bursting groove (13) is formed by laser engraving, and the longitudinal section of the bursting groove (13) is configured to be a square groove. The pressure relief portion (12) is configured such that when the internal pressure of the pressure relief valve (10) is greater than the external pressure of the pressure relief valve (10), the bursting groove (13) between the pressure relief portion (12) and the main body (11) ruptures, and the pressure relief portion (12) moves relative to the main body (11) to form a pressure relief gap, thereby releasing the internal pressure of the pressure relief valve (10).

2. The pressure relief valve (10) according to claim 1, characterized in that The overall depth range of the bursting groove (13) is configured to be 0.1 mm to 0.2 mm.

3. The pressure relief valve (10) according to claim 1, characterized in that The bursting groove (13) is configured to be formed on the outer side of the pressure relief valve (10); and the portion of the inner side of the pressure relief valve (10) corresponding to the bursting groove (13) is configured to be a plane.

4. The pressure relief valve (10) according to claim 1, characterized in that The bursting groove (13) is constructed so that the overall contour is in the shape of a smooth arc.

5. The pressure relief valve (10) according to claim 4, characterized in that The bursting groove (13) comprises a straight line segment and arc segments located on both sides of the straight line segment.

6. The pressure relief valve (10) according to claim 5, characterized in that The bursting groove (13) is partially formed between the pressure relief portion (12) and the main body (11), and the portions are integrally connected.

7. A battery top cover (20), characterized in that: include: a substrate, wherein a mounting hole is provided on the substrate; According to the pressure relief valve (10) according to any one of claims 1 to 6, the pressure relief valve (10) is configured to be mounted on the mounting hole, and the body (11) of the pressure relief valve (10) is sealed and connected to the edge of the mounting hole.

8. An integrated battery housing (30), characterized in that: include: A main body (11), wherein a receiving cavity is provided in the main body (11); A pressure relief portion (12) is provided, wherein a bursting groove (13) is formed between the pressure relief portion (12) and the main body (11), wherein the bursting groove (13) is formed by laser engraving, and the longitudinal section of the bursting groove (13) is configured as a square groove. The pressure relief portion (12) is configured such that when the internal pressure of the accommodating cavity is greater than the external pressure of the pressure relief portion (12), the bursting groove (13) between the pressure relief portion (12) and the main body (11) ruptures, and the pressure relief portion (12) moves relative to the main body (11) to form a pressure relief gap, thereby releasing the internal pressure of the accommodating cavity.

9. A battery, characterized in that: The invention comprises at least one of the pressure relief valve (10) according to any one of claims 1 to 6, the battery top cover (20) according to claim 7, and the integrated battery housing (30) according to claim 8.

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