Pressure relief structure and battery

Abstract

This utility model relates to the field of battery pressure relief technology, specifically to a pressure relief structure and a battery. The pressure relief structure includes a container body with a weak pressure relief area on at least a portion of the container body. A reinforcing member is fixed to the container body outside the weak pressure relief area. The reinforcing member has a pressure relief through-area, which strengthens the weak pressure relief area during both pressure relief and non-pressure relief states, and allows at least a portion of the weak pressure relief area to open along the pressure relief through-area during pressure relief. In this utility model, pressure is released when the internal pressure is too high through the weak pressure relief area. The reinforcing member provides additional support and protection for the weak pressure relief area. The pressure relief through-area on the reinforcing member allows internal gas to escape along the pressure relief through-area after at least a portion of the weak pressure relief area opens during pressure relief, ensuring the integrity of the pressure relief structure while allowing gas to escape smoothly.

Description

Technical Field

[0001] This utility model relates to the field of battery pressure relief technology, and more specifically, to a pressure relief structure and a battery. Background Technology

[0002] Explosion-proof terminals include new energy batteries, etc. Taking new energy batteries as an example, the battery structural components in new energy power batteries or energy storage power stations are required to open in an explosion-proof manner when the gas pressure inside the battery casing reaches 0.7MPa to 2.3MPa. This is because the aluminum or steel materials of new energy batteries may explode before a short circuit occurs, or the electrolyte and other materials may decompose and generate gas and explode after being charged for a long time.

[0003] Currently, explosion-proof structures such as explosion-proof valves and grooves are set on the surface of battery top / top covers and casings. Explosion-proof valves are assembled by welding, which is costly and inefficient. Explosion-proofing by creating grooves on the surface has defects such as poor stability and inconsistent depth.

[0004] After the grooves are formed, a weak area is created on the surface. This weak area is used to relieve pressure when the internal pressure increases. However, during assembly, transportation, and operation, external forces and vibrations may cause the weak area to crack, affecting its service life. Utility Model Content

[0005] Therefore, the pressure relief structure and battery of this utility model are intended to solve the above-mentioned technical problems.

[0006] In one aspect, the pressure relief structure provided by this utility model includes a closed container body, a weak pressure relief area provided on at least a portion of the container body, and a reinforcing member fixed on the container body outside the weak pressure relief area. The reinforcing member has a pressure relief through area, so that the reinforcing member strengthens the weak pressure relief area during pressure relief and non-pressure relief, and at least a portion of the weak pressure relief area opens along the pressure relief through area during pressure relief.

[0007] In some embodiments of this application, the pressure relief through area is configured to mimic the shape of the weak pressure relief area.

[0008] In some embodiments of this application, the outer wall of the container body is provided with a sinkhole, the reinforcing member is fixed in the sinkhole, a weak part is formed between the bottom of the sinkhole and the inner wall of the container body, and the weak pressure relief area is provided on the weak part.

[0009] In some embodiments of this application, there are 1 to N weak pressure relief zones, and the weak pressure relief zones are located on the inner wall and / or outer wall of the container body.

[0010] In some embodiments of this application, the weak pressure relief area includes an insert strip and a groove formed by inserting the insert strip, wherein the bottom of the groove and the inner or outer wall of the container body form a residual pressure relief portion; during pressure relief, at least a portion of the residual pressure relief portion opens along the pressure relief through area.

[0011] In some embodiments of this application, the insert is any one of a uniform thickness insert, a partially thickened insert, and a serrated insert, so that the residual thickness pressure relief portion is any one of a uniform thickness pressure relief portion, a partially thickened pressure relief portion, and a point-discontinuous pressure relief portion.

[0012] In some embodiments of this application, at least one end and the middle portion of the lower surface of the insert have a reduced residual thickness portion, and the reduced residual thickness portion in the middle portion and the reduced residual thickness portion at the end portion are connected by a gradient change surface, so that the reduced residual thickness pressure relief portion is a locally thickened pressure relief portion with a gradient change; or the reduced residual thickness portion in the middle portion extends to the reduced residual thickness portion at the end portion and the two are connected by a thickening notch, so that the reduced residual thickness pressure relief portion is a locally thickened pressure relief portion.

[0013] In some embodiments of this application, the lower surface of the insert has a plurality of serrated portions extending through the thickness direction of the residual thickness pressure relief portion, so that the residual thickness pressure relief portion is a point-discontinuous pressure relief portion.

[0014] In some embodiments of this application, the insert is any one or a combination of straight inserts and curved inserts.

[0015] Compared with existing technologies, the advantages of this invention are as follows: First, the weak pressure relief area on the container body can be at least partially opened during pressure relief to release pressure when the internal pressure is too high. Second, a reinforcing member is provided on the outside of the weak pressure relief area. Since the weak pressure relief area is at risk of cracking under external forces, the reinforcing member provides additional support and protection for the weak pressure relief area. Simultaneously, a pressure relief penetration area is provided on the reinforcing member. After at least part of the weak pressure relief area opens during pressure relief, the internal gas is discharged along the pressure relief penetration area. The reinforcing member continuously provides structural support to the weak pressure relief area during the pressure relief process, ensuring that the pressure relief proceeds according to a preset tearing trajectory while allowing the gas to escape smoothly.

[0016] On the other hand, the battery provided by this utility model includes the aforementioned pressure relief structure.

[0017] It is understood that the battery in this embodiment has the same beneficial effects as the pressure relief structure, and will not be described in detail here. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the container body provided in an embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the pressure relief structure provided in an embodiment of the present utility model;

[0021] Figure 3 A cross-sectional view of the pressure relief structure provided in an embodiment of this utility model;

[0022] Figure 4 Cross-sectional view of the weak pressure relief zone provided in the embodiment of this utility model Figure 1 ;

[0023] Figure 5 Cross-sectional view of the weak pressure relief zone provided in the embodiment of this utility model Figure 2 ;

[0024] Figure 6 A schematic diagram of the inlay strip provided in the embodiment of this utility model Figure 1 ;

[0025] Figure 7 A schematic diagram of the inlay strip provided in the embodiment of this utility model Figure 2 ;

[0026] Figure 8 A schematic diagram of the inlay strip provided in the embodiment of this utility model Figure 3 ;

[0027] Figure 9 A schematic diagram of the pressure relief through-area and the weak pressure relief area provided in the embodiment of this utility model;

[0028] Figure 10 A schematic diagram of the structure of the end cap having a weak pressure relief area provided in the embodiment of this utility model;

[0029] Figure 11 This is a schematic diagram of the cross-sectional structure of the insert provided in an embodiment of the present utility model.

[0030] In the diagram: 1. Container body; 11. Shell; 12. Top cover / end cover; 13. Settling tank; 14. Weak section; 15. Weak pressure relief area; 151. Residual thickness pressure relief section; 2. Reinforcing member; 21. Pressure relief through area; 3. Insert; 31. Groove; 32. Residual thickness reduction section; 33. Gradient change surface; 34. Thickening notch; 35. Serrated section. Detailed Implementation

[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0032] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] Example 1, combined with Figure 1 and Figure 2 As shown, the pressure relief structure provided in this embodiment includes a closed container body 1, which is square or circular, etc. A weak pressure relief area 15 is provided on at least a portion of the container body 1. A reinforcing member 2 is fixed on the container body 1 outside the weak pressure relief area 15 (for example, a reinforcing member 2 is provided on the outer wall of the container body 1), or the reinforcing member 2 is provided on the inner side of the weak pressure relief area 15 (for example, a reinforcing member 2 is provided on the inner wall of the container body 1). The reinforcing member 2 is either block-shaped or sheet-shaped. The reinforcing member 2 has a pressure relief through area 21, so that the reinforcing member 2 strengthens the weak pressure relief area 15 when pressure is being relieved and when pressure is not being relieved. In the pressure relief state, at least a portion of the weak pressure relief area 15 opens along the pressure relief through area 21.

[0036] Specifically, in this embodiment, at least a portion of the container body 1 includes a shell 11 or a top / end cap 12. The shell 11 is formed by stretching a metal sheet and includes side walls and a bottom surface. A pressure relief structure is disposed on the outer or inner wall of at least one side of the container body 1. For example, a weak pressure relief area 15 can be disposed on either the shell 11 or the end cap 12, or at least one weak pressure relief area 15 can be disposed on both. When the pressure relief condition is met, the weak pressure relief area 15 will open to ensure that, for example, the application terminal battery can be depressurized in a timely manner.

[0037] It is understood that the structural strength of the weak pressure relief area 15 of the container body 1 in this embodiment is weaker than that of other locations of the container body 1 where the weak pressure relief area 15 is not provided. Therefore, it is more likely to rupture first when the pressure relief pressure is reached, thereby releasing the internal pressure of the container body 1. A reinforcing member 2 is provided on the outside of the weak pressure relief area 15. The reinforcing member 2 is used to enhance the overall structural strength of the weak pressure relief area 15 during both pressure relief and non-pressure relief, continuously providing structural reinforcement protection for the weak pressure relief area 15. Simultaneously, it allows at least a portion of the weak pressure relief area 15 to open along the pressure relief penetration area of ​​the reinforcing member 2 during pressure relief, protecting the overall structure of the container and achieving effective pressure release.

[0038] Preferably, the pressure relief through area 21 and the weak pressure relief area 15 are arranged in a similar shape.

[0039] It is understood that in this embodiment, the pressure relief through-flow zone 21 and the weak pressure relief zone 15 are designed in a similar shape to ensure that when pressure is released, the internal gas can be released directly from the weak pressure relief zone 15 through the pressure relief through-flow zone 21, thereby optimizing the pressure release path and improving the explosion-proof effect.

[0040] like Figure 9 As shown, the shape of the pressure relief through-flow zone 21 includes any one or more combinations of "serpentine, ~, W, V, U, C, approximately figure 8, L". The weak pressure relief zone 15 is then modeled after the above shape so that the weak pressure relief zone 15 can open along the pressure relief through-flow zone 21.

[0041] The shape described above can also be other shapes, but this embodiment does not exhaustively list other shapes.

[0042] A weak pressure relief area 15 is provided on the end cap 12, and the shape of the weak pressure relief area 15 can be referred to as follows. Figure 9 or Figure 10 Preferred, combined Figures 2 to 3As shown, the outer wall of the container body 1 is provided with a recessed groove 13, which can also be understood as a recessed platform. The recessed groove 13 is formed by stamping or laser etching, and its shape can be rectangular, circular, elliptical, etc. A reinforcing member 2 is fixed in the recessed groove 13. A weak section 14 is formed between the bottom of the recessed groove 13 and the inner wall of the container body 1, and a weak pressure relief area 15 is provided on the weak section 14. The design of the recessed groove 13 allows it to be used to fix the reinforcing member 2, and also allows for further thinning of the weak pressure relief area 15 to meet pressure relief requirements.

[0043] Specifically, the volume of the sink 13 is smaller than the volume of the reinforcing member 2. When the reinforcing member 2 is pressed into the sink 13, the inner surface of the sink 13 is deformed by the compression and expansion of the reinforcing member 2, thereby forming a weak part 14 between the bottom of the sink 13 and the inner wall of the container body 1. At the same time, the reinforcing member 2 is fixed by compression between the reinforcing member 2 and the sink 13.

[0044] It is understood that in this embodiment, by fixing the reinforcing member 2 in the sink 13, a weak part 14 is formed for setting the weak pressure relief area 15, and the weak pressure relief area 15 is structurally strengthened.

[0045] Furthermore, the reinforcing member 2 is pressed into the sink 13, and the reinforcing member 2 is fixed by the mutual compression between the inner surface of the sink 13 and the reinforcing member 2. There are no additional reinforcement steps, which simplifies the installation procedure and reduces production costs.

[0046] Furthermore, the thickness of the reinforcing member 2 is equal to the depth of the sink 13, so that the reinforcing member 2 is flush with the outer surface of the container body 1. This eliminates the position difference. Of course, if a position difference exists, it can also be eliminated by setting a protective layer.

[0047] Preferably, there are 1 to N weak pressure relief zones 15. The number can be set according to the actual pressure relief requirements. For example, when there are two weak pressure relief zones 15, one weak pressure relief zone 15 can be set on the inner wall of the container body 1, and the other weak pressure relief zone 15 can be set on the outer wall of the container body 1. Of course, the weak pressure relief zones 15 can also be set on the outer wall of the container body 1, or they can all be set on the inner wall of the container body 1.

[0048] Specifically, such as Figure 4 As shown, taking a weak pressure relief zone 15 as an example, the weak pressure relief zone 15 is set on the inner wall of the container body 1; if Figure 5 As shown, the weak pressure relief zone 15 is provided on the outer wall of the container body 1.

[0049] Preferably, the weak pressure relief area 15 includes a strip 3 and a groove 31 formed by inserting the strip 3. The bottom of the groove 31 and the inner or outer wall of the container body 1 form a weak pressure relief part 151. When depressurizing, at least a portion of the weak pressure relief part 151 opens along the pressure relief through area 21.

[0050] Specifically, the insert 3, after being embedded in the groove 31, is in a non-closed form. The insert 3 can be any one or a combination of two types: straight insert and curved insert, which can be selected according to the actual situation. The shape of the insert 3 can be referenced. Figure 9 It has a strip-shaped structure, rather than a complete ring structure, so that the weak pressure relief zone 15 can more accurately control the pressure relief zone for pressure relief.

[0051] Specifically, such as Figure 11 As shown, the cross-sectional shape of the insert 3 can be square, or the cross-sectional shape of the end of the insert 3 that extends into the groove 31 can be any one of the following: a bevel, a straight surface, a convex arc surface, two bevels distributed at an angle, or a concave arc surface. The design of other surfaces, except for the straight surface, can change the thickness of the weak pressure relief part 151, thereby allowing for more precise control of pressure relief in the pressure relief area.

[0052] Specifically, the container body 1 is preferably made of 3003-H14 stainless steel with a hardness of 40-45HB and a thickness of 1.5mm. The insert 3 is preferably made of 304 stainless steel with a hardness of 123-200HB, an expansion amount of 0.08-0.09mm, and a width of 1.10-1.15mm. The embedding depth of the insert 3 is preferably 1.10-1.16mm, and the thickness of the weak pressure relief portion 151 after the insert 3 is embedded in the weak pressure relief area 15 is preferably 0.06mm-0.28mm.

[0053] Understandably, the insert 3 is embedded into the weak pressure relief groove 31. The bottom of the groove 31 and the inner or outer wall of the container body 1 form a weak pressure relief section 151, which can provide a pressure relief path when the pressure exceeds a certain limit. The pressure relief through area ensures that the container body 1 will not explode or other dangerous situations when subjected to excessive pressure. By controlling the pressure relief range, the pressure is released in an orderly manner, protecting the safety of the overall structure.

[0054] Preferred, combined Figures 6 to 8 As shown, the insert 3 is any one of the following: equal thickness insert 3, partially reduced thickness insert 3, and serrated insert 3, so that the weak pressure relief part 151 is any one of the following: equal thickness pressure relief part, partially thickened pressure relief part, and point-discontinuous pressure relief part.

[0055] It is understandable that in this embodiment, by designing the insert 3 as any one of equal thickness, partially reduced thickness, or serrated, the weak pressure relief part 151 forms a corresponding residual thickness gradient change, taking into account both strength and pressure relief function.

[0056] Furthermore, the uniform thickness insert 3 is suitable for situations requiring stable strength and uniform stress distribution, ensuring uniform stress distribution and avoiding damage caused by localized stress concentration. The locally reduced thickness insert 3 reduces the thickness at certain locations, providing additional pressure relief capacity in specific areas while maintaining the overall structural strength. The serrated insert 3 can guide stress dispersion along the serration direction, thereby improving the fatigue resistance and pressure relief capacity of the insert 3.

[0057] Preferred, combined Figure 6 As shown, at least one end and the middle portion of the lower surface of the insert 3 have residual thickness reduction portions 32, and the residual thickness reduction portions 32 in the middle and at the ends are connected by a gradient change surface 33, so that the weak pressure relief portion 151 is a locally thickened pressure relief portion with a gradient change; combined with Figure 7 As shown, the remaining thickness reduction portion 32 at the middle of the lower surface of the insert 3 extends to the remaining thickness reduction portion 32 at the end and the two are connected by the thickening notch 34, so that the weak pressure relief portion 151 is a locally thickened pressure relief portion.

[0058] Specifically, the gradient change surface 33 can be an arc-shaped surface or an inclined surface, allowing the pressure to be released gradually, thereby avoiding damage caused by stress concentration.

[0059] It is understood that in this embodiment, at least one end and the middle portion of the lower surface of the insert 3 have a reduced thickness portion 32, and adjacent reduced thickness portions 32 are connected by a gradient change surface 33 or a thickening notch 34. During depressurization, the internal pressure of the container body 1 can be gradually released along the reduced thickness portion 32, precisely controlling the depressurization area and thus avoiding damage caused by sudden pressure changes. At the same time, the locally thickened depressurization portion corresponding to the gradient change surface 33 maintains high structural strength during the pressure release process, effectively releasing internal pressure without damaging the overall structure of the container. The thickening notch 34 increases the local residual thickness of the weak depressurization portion 151, which can prevent tearing from continuing during depressurization.

[0060] Preferred, combined Figure 8 As shown, the lower surface of the insert 3 has a number of serrated portions 35 that penetrate the thickness direction of the weak pressure relief portion 151, so that the weak pressure relief portion 151 is a point-discontinuous pressure relief portion.

[0061] As can be understood, in this embodiment, several serrated portions 35 on the lower surface of the insert 3 at least partially penetrate the weak pressure relief portion 151 in the thickness direction, making the weak pressure relief portion 151 a point-discontinuous pressure relief portion, which can achieve more uniform and controllable pressure release and avoid the problem of local stress concentration that may be caused by a single pressure relief point.

[0062] In this embodiment, the insert 3 is pressed into the inner or outer surface of the container body 1. Of course, the inner or outer surface can also be referred to as the inner wall and outer wall. The weak pressure relief part 151 is structurally reinforced by the reinforcing member 2 that is always fixed to the container body 1 to meet the strength requirements of various scenarios and environments, thereby ensuring the safety of production and use. In addition, during pressure relief, the pressure relief through area 21 of this embodiment can make the weak pressure relief part 15 tear along a preset trajectory path, avoiding excessive tearing and other phenomena.

[0063] Example 2: A battery comprising the pressure relief structure of Example 1. The battery may be used in applications such as new energy vehicles.

[0064] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Pressure relief structure comprising a container body (1) provided with a weakened pressure relief zone (15) on at least part of said container body (1), characterized in that, A reinforcing member (2) is fixed on the container body (1) outside the weak pressure relief area (15). The reinforcing member (2) has a pressure relief through area (21) so that the reinforcing member (2) strengthens the weak pressure relief area (15) during pressure relief and non-pressure relief and at least a portion of the weak pressure relief area (15) opens along the pressure relief through area (21) during pressure relief.

2. The pressure relief structure according to claim 1, characterized in that, The pressure relief through area (21) is set in a similar shape to the weak pressure relief area (15).

3. The pressure relief structure according to claim 1, characterized in that, The outer wall of the container body (1) is provided with a sink groove (13), the reinforcing member (2) is fixed in the sink groove (13), a weak part (14) is formed between the bottom of the sink groove (13) and the inner wall of the container body (1), and the weak pressure relief area (15) is provided on the weak part (14).

4. The pressure relief structure according to claim 1, characterized in that, There are 1 to N weak pressure relief zones (15), and the weak pressure relief zones (15) are located on the inner wall and / or outer wall of the container body (1).

5. The pressure relief structure according to any one of claims 1-4, characterized in that, The weak pressure relief zone (15) includes a strip (3) and a groove (31) formed by embedding the strip (3). The bottom of the groove (31) and the inner or outer wall of the container body (1) form a residual pressure relief part (151). When the pressure is released, at least a portion of the residual pressure relief part (151) opens along the pressure relief through zone (21).

6. The pressure relief structure according to claim 5, characterized in that, The insert (3) is any one of the following: equal thickness insert, partially reduced thickness insert, and serrated insert, so that the residual thickness pressure relief part (151) is any one of the following: equal thickness pressure relief part, partially thickened pressure relief part, and point-discontinuous pressure relief part.

7. The pressure relief structure according to claim 6, characterized in that, The lower surface of the insert (3) has at least one end and the middle part with a residual thickness reduction portion (32), and the residual thickness reduction portion (32) in the middle and the residual thickness reduction portion (32) at the end are connected by a gradient change surface (33) so that the residual thickness pressure relief portion (151) is a locally thickened pressure relief portion with a gradient change; or the residual thickness reduction portion (32) in the middle extends to the residual thickness reduction portion (32) at the end and the two are connected by a thickening notch (34) so ​​that the residual thickness pressure relief portion (151) is a locally thickened pressure relief portion.

8. The pressure relief structure according to claim 6, characterized in that, The lower surface of the insert (3) has a plurality of serrated portions (35) that penetrate the thickness direction of the residual thickness pressure relief portion (151) so that the residual thickness pressure relief portion (151) is a point-discontinuous pressure relief portion.

9. The pressure relief structure according to claim 5, characterized in that, The insert (3) is any one or a combination of straight inserts and curved inserts.

10. A battery, characterized in that, The battery includes the pressure relief structure according to any one of claims 1-9.

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