Explosion-proof valve, battery pack and electric device

Abstract

The utility model discloses an anti-explosion valve, a battery pack and an electric device, the anti-explosion valve comprises a welding area and a weak area, and the welding area is arranged around the peripheral side of the weak area; the weak area is provided with a first wall surface and a second wall surface which are opposite to each other, the first wall surface is provided with a first nick, the first nick is recessed from the first wall surface to the second wall surface, the first nick is cut off in the direction perpendicular to the first wall surface along the first nick, and the section of the first nick is trapezoidal or V-shaped. According to the technical scheme provided by the utility model, the technical problem that the explosion-proof valve of the battery pack in the prior art may have a cracking risk under charging and discharging conditions, or the explosion-proof valve cannot be normally opened under some conditions can be solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an explosion-proof valve, a battery pack, and an electrical device. Background Technology

[0002] With increasing focus on safety and energy efficiency, battery pack safety has become increasingly important. Furthermore, as battery pack energy density continues to improve, highly integrated battery pack structures are becoming increasingly crucial. Therefore, explosion-proof valves hold an irreplaceable position in battery packs. However, current explosion-proof valves in battery packs may be at risk of cracking during charging and discharging, or they may fail to open properly under certain circumstances. Utility Model Content

[0003] This utility model provides an explosion-proof valve, a housing, and a battery pack, aiming to effectively solve the technical problems in the prior art where the explosion-proof valve of the battery pack may have the risk of cracking under charging and discharging conditions, or the explosion-proof valve may not be able to open normally under certain circumstances.

[0004] According to a first aspect of the present invention, the present invention provides an explosion-proof valve, comprising: a welding area and a weak area, wherein the welding area is disposed around the outer periphery of the weak area; the weak area has a first wall surface and a second wall surface opposite to each other, wherein the first wall surface has a first groove, the first groove is concave from the first wall surface to the second wall surface, and the first groove is cut off along a direction perpendicular to the first wall surface, wherein the cross section of the first groove is trapezoidal or V-shaped.

[0005] Furthermore, when the cross-section of the first notch is trapezoidal, the length of the lower base of the trapezoid is the opening width of the first notch, the length of the upper base of the trapezoid is the bottom width of the first notch, wherein the opening width is greater than the bottom width; the bottom width of the first notch is half of the opening width, and the depth from the bottom of the first notch to the second wall is 55%-75% of the thickness of the weak area.

[0006] Furthermore, when the cross-section of the first notch is trapezoidal, a second notch is also provided on the bottom surface of the first notch. The concave direction of the second notch is the same as that of the first notch. The second notch is connected to the first notch, and the opening of the second notch faces the first notch.

[0007] Furthermore, the second notch is cut off along a direction perpendicular to the first wall surface, and the cross-section of the second notch is V-shaped; the bottom width of the first notch is half the width of the opening, the depth of the second notch is 30%-45% of the thickness of the weak area, and the angle of the V-shaped second notch is 55 degrees-75 degrees.

[0008] Furthermore, when the cross-section of the first notch is trapezoidal, the width of the bottom surface of the first notch is 20%-35% of the opening width, and the depth from the bottom surface of the first notch to the second wall surface is 20%-40% of the thickness of the weak area.

[0009] Furthermore, the second notch is cut off along a direction perpendicular to the first wall surface, and the cross-section of the second notch is arc-shaped; the depth of the second notch from the end away from the first notch to the second wall surface is 35%-45% of the thickness of the weak area, the angle of the arc-shaped second notch is 25 degrees-45 degrees, the opening end of the first notch to the bottom surface of the first notch forms the side of a trapezoid, and the distance from the opening of the second notch to its nearest trapezoidal side is 15%-25% of the opening width of the first notch.

[0010] Furthermore, when the cross-section of the first notch is V-shaped, the angle of the V-shaped first notch is 30-45 degrees, the opening width of the V-shaped first notch is 1.8-3.0 times the thickness of the weak area, and the depth from the end of the V-shaped first notch away from its opening to the opposite side of the explosion-proof valve where the first notch is opened is 25%-40% of the thickness of the weak area.

[0011] Furthermore, when the cross-section of the first notch is trapezoidal, two consecutive V-shaped third notches are also provided on the bottom surface of the first notch. The openings of the two V-shaped third notches face the first notch. The depth from the bottom end of the third notch to the opposite side of the explosion-proof valve where the first notch is opened is 25%-40% of the thickness of the weak area. The depth from the opening end of the third notch to the opposite side of the explosion-proof valve where the first notch is opened is 35%-40% of the thickness of the weak area. The opening angle of the first notch is 30 degrees-45 degrees, and the opening width of the first notch is 1.8-3.0 times the thickness of the weak area.

[0012] According to a second aspect of the present invention, the present invention also provides a battery pack, including the explosion-proof valve described in any of the above claims, and further including a housing and an electrode assembly, wherein the housing has a mounting hole for mounting the explosion-proof valve, and the electrode assembly is disposed inside the housing.

[0013] According to a third aspect of the present invention, the present invention also provides an electrical device including the aforementioned battery pack.

[0014] Through one or more embodiments of the above-described embodiments of this utility model, at least the following technical effects can be achieved:

[0015] In the technical solution disclosed in this utility model, when the cross-section of the first notch is trapezoidal, the bottom of the first notch is planar, which can improve the safety of the explosion-proof valve during normal operation and recycling. When the first notch is V-shaped, it can improve the rigidity and strength performance of the explosion-proof valve. Attached Figure Description

[0016] The technical solution and other beneficial effects of this utility model will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of the explosion-proof valve provided in an embodiment of the present utility model;

[0018] Figure 2 This is the first embodiment of the present utility model. Figure 1 A cross-sectional view along the AA direction;

[0019] Figure 3 for Figure 2 Enlarged view of section B;

[0020] Figure 4 This is a second embodiment of the present utility model. Figure 1 A cross-sectional view along the AA direction;

[0021] Figure 5 for Figure 4 Enlarged view of section C;

[0022] Figure 6 This is the third embodiment of the present utility model. Figure 1 A cross-sectional view along the AA direction;

[0023] Figure 7 for Figure 6 Enlarged view of section D in the middle;

[0024] Figure 8 This is the fourth embodiment of the present utility model. Figure 1 A cross-sectional view along the AA direction;

[0025] Figure 9 for Figure 8 Enlarged view of section E in the middle;

[0026] Figure 10 This is the fifth embodiment of the present utility model. Figure 1 A cross-sectional view along the AA direction;

[0027] Figure 11 for Figure 10 Enlarged view of section F in the middle;

[0028] Figure 12 This is the sixth embodiment of the present utility model. Figure 1A cross-sectional view along the AA direction;

[0029] Figure 13 for Figure 12 Enlarged view of section G in the middle;

[0030] Figure 14 This is an exploded view of the battery pack according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] 1. Welding area; 2. Weak area; 21. First notch; 22. Second notch; 23. Third notch; 3. First wall surface; 4. Second wall surface; 11. Outer shell; 12. Explosion-proof valve; 13. Electrode assembly; 14. End cap. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0035] With the rapid development and iteration of the automotive industry, the cost of battery packs has become particularly prominent. Furthermore, electric vehicles encounter various complex operating conditions during operation. To enhance the battery pack's ability to cope with these conditions, its structural strength must be improved, and the design of the battery pack structure directly affects its overall safety performance. With increasing focus on safety and energy efficiency, battery pack safety performance has become increasingly important. With the development of new processes and technologies, battery pack structures have become more diverse. Moreover, with the continuous improvement of battery pack energy density, highly integrated battery pack structures are becoming increasingly crucial.

[0036] Most current battery packs use aluminum profiles and explosion-proof valves on the side. In extreme cases, the explosion-proof valves on the side can cause arcing, which can seriously affect the safety of the electrical components and battery cells inside the pack.

[0037] Therefore, although explosion-proof valves have an irreplaceable position in battery packs, current explosion-proof valves may be at risk of cracking during charging and discharging, or they may fail to open properly in some situations.

[0038] like Figure 1 As shown and Figure 2 As shown, this utility model embodiment provides an explosion-proof valve, including: a welding area 1 and a weak area 2. The welding area 1 is arranged around the outer periphery of the weak area 2, wherein the thickness of the welding area 1 is greater than the thickness of the weak area 2. The weak area 2 has a first wall surface 3 and a second wall surface 4 opposite to each other. The distance between the first wall surface 3 and the second wall surface 4 is the thickness of the weak area 2. The first wall surface 3 has a first notch 21. The first notch 21 is concave from the first wall surface 3 to the second wall surface 4. The first notch 21 is cut off along the direction perpendicular to the first wall surface 3. The cross section of the first notch 21 is trapezoidal or V-shaped.

[0039] In this embodiment, when the cross-section of the first notch 21 is trapezoidal, the length of the lower base of the trapezoid is the opening width of the first notch 21, and the length of the upper base of the trapezoid is the bottom width of the first notch 21, wherein the opening width is greater than the bottom width.

[0040] Furthermore, when the first notch 21 is cut off in a direction perpendicular to the first wall surface 3, more specifically, the first notch 21 is cut off on the first wall surface 3, and in a direction perpendicular to the opening of the first notch 21, from the second wall surface 4 to the first wall surface 3.

[0041] The explosion-proof valve provided in this application embodiment, when the cross-section of the first notch 21 is trapezoidal, can improve the safety of the explosion-proof valve during normal cyclic use because the bottom of the first notch 21 is planar. When the first notch 21 is V-shaped, it can improve the rigidity and strength performance of the explosion-proof valve.

[0042] In some embodiments, as Figure 2 and Figure 3 When the cross-section of the first notch 21 is trapezoidal, for Figure 1 Divide the section along AA to obtain Figure 2 A1-A1, the B part of A1-A1 is magnified to obtain Figure 3 Please see Figure 3 The bottom width c of the first notch 21 is half the opening width d, and the depth a from the bottom of the first notch 21 to the opposite side of the explosion-proof valve opening the first notch 21 is 55%-75% of the thickness b of the weak area 2.

[0043] In this embodiment, the first notch 21 is a planar notch, and the bottom of the first notch 21 is a planar shape, which improves the safety of the explosion-proof valve during normal cyclic use, especially the safety of vibrating road surfaces.

[0044] In some embodiments, as Figure 4 and Figure 5 When the cross-section of the first notch 21 is trapezoidal, for Figure 1 Divide the section along AA to obtain Figure 4 A2-A2, the bottom surface of the first notch 21 is also provided with a second notch 22, the indentation direction of the second notch 22 is the same as the indentation direction of the first notch 21, the second notch 22 is connected to the first notch 21, and the opening of the second notch 22 faces the first notch 21.

[0045] In this embodiment, the second notch 22 is cut off along a direction perpendicular to the first wall surface 3, and the cross-section of the second notch 22 is V-shaped.

[0046] The V-shaped structure ensures rapid opening under extreme conditions, especially for high-energy battery systems. This structure, equivalent to a planar shape, enhances the safety of the explosion-proof valve during normal cyclic operation, particularly on vibrating surfaces.

[0047] In this embodiment, if Figure 5 As shown, the bottom width c of the first notch 21 is half the opening width d, the depth a of the second notch 22 is 30%-45% of the thickness b of the weak area 2, and the angle of the V-shaped second notch 22 is 55-75 degrees.

[0048] In some embodiments, as Figure 6 and Figure 7 When the cross-section of the first notch 21 is trapezoidal, for Figure 1 Divide the section along AA to obtain Figure 6 A3-A3, the D part of A3-A3 is magnified to obtain Figure 7 Please see Figure 7 The bottom width c is 20%-35% of the opening width d, and the depth a from the bottom of the first notch 21 to the opposite side of the explosion-proof valve opening the first notch 21 is 20%-40% of the thickness b of the weak area 2.

[0049] In this embodiment, the bottom of the first notch 21 is a recessed platform structure. By designing a short and flat recessed platform structure, the opening pressure and stress levels under cyclic operating conditions and extreme situations of the explosion-proof valve can be effectively balanced, further improving the rigidity and strength performance of the explosion-proof valve.

[0050] In some embodiments, as Figure 8 and Figure 9 When the cross-section of the first notch 21 is trapezoidal, for Figure 1 Divide the section along AA to obtain Figure 8 In the case where the cross-section of the first notch 21 is trapezoidal, a second notch 22 is also provided on the bottom surface of the first notch 21. The concave direction of the second notch 22 is the same as the concave direction of the first notch 21. The second notch 22 is connected to the first notch 21, and the opening of the second notch 22 faces the first notch 21. The second notch 22 is cut off along the direction perpendicular to the first wall surface 3, and the cross-section of the second notch 22 is arc-shaped.

[0051] In this embodiment, the first notch 21 and the second notch 22 are combined, that is, the arc shape can reduce stress concentration, and the platform can serve as a transition of the arc. When the explosion-proof valve area is subjected to cell expansion deformation, the stress at the notch can be reduced or mitigated, thereby improving the overall safety of the explosion-proof valve.

[0052] In some embodiments, please refer to Figure 9 The depth of the second notch 22 from the end away from the first notch 21 to the second wall surface 4 is 35%-45% of the thickness of the weak area 2. The angle of the arc-shaped second notch 22 is 25 degrees-45 degrees. The opening end of the first notch 21 to the bottom surface of the first notch 21 forms the side of a trapezoid. The distance from the opening of the second notch 22 to its nearest trapezoidal side is 15%-25% of the opening width of the first notch 21.

[0053] In some embodiments, as Figure 10 and Figure 11 As shown, when the cross-section of the first notch 21 is V-shaped, for Figure 1 Divide the section along AA to obtain Figure 10 A5-A5, the F part of A5-A5 is magnified to obtain Figure 11 Please see Figure 11 The angle c of the first V-shaped notch 21 is 30-45 degrees, the opening width d of the first V-shaped notch 21 is 1.8-3.0 times the thickness b of the weak area 2, and the depth a of the first V-shaped notch 21 away from its opening to the opposite side of the explosion-proof valve opening the first notch 21 is 25%-40% of the thickness b of the weak area 2.

[0054] In this embodiment, the V-shaped structure is relatively easy to manufacture, and the rigidity and strength performance of the explosion-proof valve can be improved by designing the V-shaped structure.

[0055] In some embodiments, as Figure 12 and Figure 13 As shown, when the cross-section of the first notch 21 is trapezoidal, for Figure 1 Divide the section along AA to obtain Figure 12 A6-A6, the G part of A6-A6 is magnified to obtain Figure 13 Please see Figure 13 The bottom surface of the first notch 21 is also provided with two consecutive V-shaped third notches 23. The openings of the two V-shaped third notches 23 are facing the first notch 21. The depth from the bottom end of the third notch 23 to the opposite side of the explosion-proof valve 12 where the first notch 21 is opened is 25%-40% of the thickness of the weak area 2. The depth from the opening end of the third notch 23 to the opposite side of the explosion-proof valve 12 where the first notch 21 is opened is 35%-40% of the thickness of the weak area 2. The opening angle of the first notch 21 is 30 degrees-45 degrees. The opening width of the first notch 21 is 1.8-3.0 times the thickness of the weak area 2.

[0056] In this embodiment, two consecutive V-shaped third notches 23 together form an M-shaped or W-shaped notch. The third notch 23 as a whole can be regarded as a spring structure, which can reduce or weaken the force at the notch when the explosion-proof valve area is subjected to cell expansion and deformation, thereby improving the overall safety of the explosion-proof valve. At the same time, it can still be opened normally under extreme conditions.

[0057] like Figure 14 As shown, this application embodiment also provides a battery pack, including the explosion-proof valve 12 of any of the above embodiments, and also including a housing 11 and an electrode group 13. The housing 11 has a mounting hole for mounting the explosion-proof valve 12, the electrode group 13 is disposed inside the housing 11, and an end cap 14 is also provided on the housing 11.

[0058] In this embodiment, the explosion-proof valve 12 is located on the long side of the housing 11. This application also provides an electrical device including the battery pack described in the above embodiments.

[0059] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. An explosion-proof valve, characterized in that, include: A welding zone and a weak zone, wherein the welding zone is arranged around the outer periphery of the weak zone; The weak area has a first wall and a second wall, the first wall has a first groove, the first groove is concave from the first wall to the second wall, the first groove is cut off along the direction perpendicular to the first wall, and the cross section of the first groove is trapezoidal or V-shaped.

2. The explosion-proof valve as described in claim 1, characterized in that, When the cross-section of the first notch is trapezoidal, the length of the lower base of the trapezoid is the opening width of the first notch, and the length of the upper base of the trapezoid is the bottom width of the first notch. The bottom width of the first notch is half the width of the opening, and the depth from the bottom of the first notch to the second wall is 55%-75% of the thickness of the weak area.

3. The explosion-proof valve as described in claim 1, characterized in that, When the cross-section of the first notch is trapezoidal, a second notch is also provided on the bottom surface of the first notch. The concave direction of the second notch is the same as that of the first notch. The second notch is connected to the first notch, and the opening of the second notch faces the first notch.

4. The explosion-proof valve as described in claim 3, characterized in that, The second notch is cut off along a direction perpendicular to the first wall surface, and the cross-section of the second notch is V-shaped; The bottom width of the first notch is half the opening width of the first notch, the depth of the second notch is 30%-45% of the thickness of the weak area, and the angle of the V-shaped second notch is 55 degrees-75 degrees.

5. The explosion-proof valve as described in claim 1, characterized in that, When the cross-section of the first notch is trapezoidal, the width of the bottom surface of the first notch is 20%-35% of the opening width of the first notch, and the depth from the bottom surface of the first notch to the second wall surface is 20%-40% of the thickness of the weak area.

6. The explosion-proof valve as described in claim 3, characterized in that, The second notch is cut along a direction perpendicular to the first wall surface, and the cross-section of the second notch is arc-shaped. The depth of the second notch from the end away from the first notch to the second wall surface is 35%-45% of the thickness of the weak area. The angle of the arc-shaped second notch is 25 degrees-45 degrees. The opening end of the first notch to the bottom surface of the first notch forms the side of a trapezoid. The distance from the opening of the second notch to its nearest trapezoidal side is 15%-25% of the opening width of the first notch.

7. The explosion-proof valve as described in claim 1, characterized in that, When the cross-section of the first notch is V-shaped, the angle of the first notch in the V-shape is 30-45 degrees, the opening width of the first notch in the V-shape is 1.8-3.0 times the thickness of the weak area, and the depth from the end of the first notch in the V-shape away from its opening to the opposite side of the explosion-proof valve where the first notch is opened is 25%-40% of the thickness of the weak area.

8. The explosion-proof valve as described in claim 1, characterized in that, When the cross-section of the first notch is trapezoidal, two consecutive V-shaped third notches are also provided on the bottom surface of the first notch. The openings of the two V-shaped third notches face the first notch. The depth from the bottom end of the third notch to the opposite side of the explosion-proof valve where the first notch is opened is 25%-40% of the thickness of the weak area. The depth from the opening end of the third notch to the opposite side of the explosion-proof valve where the first notch is opened is 35%-40% of the thickness of the weak area. The opening angle of the first notch is 30 degrees-45 degrees, and the opening width of the first notch is 1.8-3.0 times the thickness of the weak area.

9. A battery pack, characterized in that, The explosion-proof valve as described in any one of claims 1-8 further includes a housing and an electrode assembly, wherein the housing has mounting holes for mounting the explosion-proof valve, and the electrode assembly is disposed within the housing.

10. An electrical device, characterized in that, Includes the battery pack as described in claim 9.

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