Explosion-proof structure, battery and electric equipment

Abstract

The utility model provides an explosion-proof structure, a battery and electric equipment, and relates to the technical field of batteries, the explosion-proof structure comprises a body, the body is provided with an explosion-proof nick and a guide nick; the explosion-proof nick comprises a first nick and two second nicks, the two ends of the first nick are correspondingly provided with the second nicks respectively, and the two second nicks are located on the same side of the first nick; the connecting line between the ends, far away from the first nick, of the two second nicks and the area defined by the first nick and the two second nicks are a pressure relief area, and the guide nick coincides with the connecting line, or the guide nick is located on the outer side, far away from the pressure relief area, of the connecting line. According to the utility model, the explosion-proof nicks and the guide nicks are formed on the body, so that the processing and assembling procedures are reduced, and the production efficiency and the product percent of pass are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field, specifically, relate to a kind of explosion-proof structure, battery and electric equipment. BACKGROUND

[0002] Explosion-proof valve is the safety component of lithium battery, it is usually arranged on the shell / cover plate of battery, when the pressure in battery exceeds the opening pressure of explosion-proof valve, explosion-proof valve opens, to exclude the high-pressure gas inside battery, avoid the internal pressure of battery to continue to increase, thereby delay battery safety out of control progress and reduce battery pack out of control degree.

[0003] At present, due to the limitation of one-way structure characteristics, the opening direction of traditional explosion-proof valve cannot be fixed, so that after explosion-proof valve opens, high-temperature airflow, electrolyte and the like are easy to splash to surrounding battery cell, thereby causing pollution.Moreover, traditional explosion-proof valve is usually welded as a part on the shell / cover plate of battery, therefore, the mounting part of explosion-proof valve needs to be machined on the shell / cover plate of battery first.Before welding explosion-proof valve to shell / cover plate, explosion-proof valve also needs to go through stamping, cleaning, heat treatment and other processing procedures, and then laser welding assembly is carried out with the shell / cover plate of battery after inspection, which not only makes the part processing and assembly procedures of explosion-proof valve more complicated, and production efficiency is lower, but also easily leads to the whole shell / cover plate of battery to be defective or scrapped. SUMMARY

[0004] The problem solved by the utility model is how to improve the production efficiency and product qualification rate of explosion-proof valve, and reduce the pollution degree of surrounding battery cell after explosion-proof valve opens.

[0005] To solve the above problems, the utility model provides a kind of explosion-proof structure, battery and electric equipment.

[0006] Firstly, the utility model provides a kind of explosion-proof structure, including body, explosion-proof notch and guide notch are equipped on the body;

[0007] The explosion-proof notch includes first notch and two second notches, two ends of the first notch are respectively correspondingly provided with the second notch, the second notch is arranged at the included angle with the first notch, and two second notches are located on the same side of the first notch;

[0008] The line between the end of two second notches away from the first notch is coincident with the first notch and two second notches, and the area surrounded by the first notch and two second notches is pressure relief area,

[0009] The guide notch is coincident with the line, or the guide notch is located on the side of the line away from the pressure relief area.

[0010] Optionally, the guide notch has a groove depth less than that of the explosion-proof notch.

[0011] Optionally, the body has opposite outer and inner surfaces, the guide notch is on the outer surface, and the explosion-proof notch is on the inner surface.

[0012] Optionally, the body has opposite outer and inner surfaces,

[0013] the guide notch is on the outer surface, and the explosion-proof notch is on the inner surface; or the guide notch is on the inner surface, and the explosion-proof notch is on the outer surface; or the guide notch is on the inner surface, and the explosion-proof notch is on the inner surface.

[0014] Optionally, the guide notch is a groove structure formed on the body, the groove structure has an opening, the width of the guide notch at the opening is 0.5-2.0 mm, the included angle is 15-30 degrees, and the residual thickness of the body at the guide notch is 0.15-0.3 mm.

[0015] Optionally, the body includes a planar portion and a concave portion, the body is concave at the explosion-proof notch towards the inside of the body to form the concave portion, the surface of the concave portion does not protrude from the plane in which the planar portion is located, and the explosion-proof notch and the guide notch are arranged on the concave portion.

[0016] Optionally, the body includes a planar portion and a convex portion, the body is convex at the explosion-proof notch towards the outside of the body to form the convex portion, the surface of the convex portion protrudes from the plane in which the planar portion is located, and the explosion-proof notch and the guide notch are arranged on the convex portion.

[0017] Optionally, the explosion-proof notch further includes two third notches, the two ends of the first notch are respectively provided with the third notches, the third notches are respectively located on the two sides of the first notch with the second notches, the third notches and the second notches are arranged at an included angle and their end portions meet at the end portions of the first notch, and the body is provided with two guide notches, one of which is symmetrically arranged on each side of the first notch.

[0018] Optionally, the groove depth of the second notch and / or the third notch is greater than or equal to that of the first notch.

[0019] Optionally, the included angle β between the second notch and the third notch is between 80° and 160°.

[0020] In a second aspect, the utility model provides a battery, including body and the explosion-proof structure as described above.

[0021] In a third aspect, the utility model provides a kind of electric equipment, including the battery as described above.

[0022] The utility model discloses the beneficial effects of explosion-proof structure, battery and electric equipment are as follows:

[0023] By setting the explosion-proof structure on the shell of the battery or the cover plate of the battery, the explosion-proof notch and the guide notch of the explosion-proof structure can be on the body, wherein the explosion-proof notch mainly includes a first notch and two second notches, and the guide notch and the explosion-proof notch can be on the same surface or opposite surfaces of the body. The second notches are respectively arranged at both ends of the first notch, so that the line between the ends of the two second notches away from the first notch and the area enclosed by the first notch and the two second notches are the pressure relief area of the explosion-proof structure during the explosion relief operation. The part of the explosion-proof structure in the pressure relief area can form an explosion-proof membrane, which is integrally formed on the shell or cover plate of the battery as the explosion-proof membrane for the explosion-proof structure to realize exhaust pressure relief. This not only reduces the part processing and assembly process of the explosion-proof structure, improves the production efficiency and product qualification rate, but also eliminates the need for thinning the center area of the explosion-proof structure to facilitate the cracking of the explosion-proof structure, thereby improving the utilization rate of the body material. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic view of the shaft side structure of the battery in the embodiment of the utility model.

[0025] Figure 2 It is one of the schematic views of the front structure of the battery in the embodiment of the utility model.

[0026] Figure 3 It is Figure 1 It is a schematic view of the section at B-B.

[0027] Figure 4 It is a schematic view of the structure in which the explosion-proof notch and the guide notch are on the outer surface of the body in the embodiment of the utility model.

[0028] Figure 5 It is a schematic view of the structure in which the guide notch is on the outer surface of the body in the embodiment of the utility model.

[0029] Figure 6 It is a schematic view of the structure in which the explosion-proof notch is on the inner surface of the body in the embodiment of the utility model.

[0030] Figure 7 It is a schematic view of the structure in which the explosion-proof notch and the guide notch are on the inner surface of the body in the embodiment of the utility model.

[0031] Figure 8 It is a schematic view of the structure in which the explosion-proof notch is on the outer surface of the body in the embodiment of the utility model.

[0032] Figure 9 It is the structure schematic view of the guide notch in the inner surface of the body in the embodiment of the utility model.

[0033] Figure 10 It is the side surface structure schematic view one of the battery in the embodiment of the utility model.

[0034] Figure 11 It is the structure schematic view of A in the embodiment of the utility model. Figure 10

[0035] Figure 12 It is the side surface structure schematic view two of the battery in the embodiment of the utility model.

[0036] Figure 13 It is the structure schematic view of B in the embodiment of the utility model. Figure 12

[0037] Figure 14 It is the front surface structure schematic view two of the battery in the embodiment of the utility model.

[0038] Mark explanation:

[0039] 11-body;111-flat part;112-recess part;113-tub part;12-explosion-proof notch;121-first notch;122-second notch;123-third notch;13-guide notch;14-pressure relief area. Specific implementation

[0040] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings. Although some embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be realized in various forms, and should not be interpreted as being limited to the embodiments described herein, on the contrary, these embodiments are provided to more thoroughly and completely understand the utility model. It should be understood that the drawings and embodiments of the utility model are only for illustrative purposes, and are not used to limit the protection scope of the utility model.

[0041] The Z axis in the drawing represents the vertical direction, that is, the up-down position, and the positive direction of the Z axis represents the upper side, and the negative direction of the Z axis represents the lower side; The X axis in the drawing represents the horizontal direction, and is designated as the front-rear position, and the positive direction of the X axis represents the front side, and the negative direction of the X axis represents the rear side; The Y axis in the drawing represents the left-right position, and the positive direction of the Y axis represents the left side, and the negative direction of the Y axis represents the right side. It should be noted that the meanings of the aforementioned Z axis, Y axis and X axis are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, structure and operation, and therefore cannot be understood as a limitation of the present application. ​​

[0042] The term "comprising" and variations thereof as used herein are used inclusively, i.e., "comprising but not limited to"; the term "based on" is "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Related definitions of other terms will be given in the description below. It is noted that the terms "first", "second", and the like in the present application refer to different apparatuses, modules or units and do not imply any order, sequence or interdependence of the functions of these apparatuses, modules or units.

[0043] It is noted that the modification of "one" or "multiple" in the present application is illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0044] To solve the problems in the above related technologies, the present embodiment provides an explosion-proof structure, a battery and an electric device.

[0045] As shown in Figure 1 and Figure 2 The explosion-proof structure provided by the present embodiment comprises a body 11, wherein the body 11 is provided with an explosion-proof notch 12 and a guide notch 13;

[0046] The explosion-proof notch 12 comprises a first notch 121 and two second notches 122, the two ends of the first notch 121 are respectively provided with the second notches 122, the second notches 122 are arranged at an angle with the first notch 121, and the two second notches 122 are located on the same side of the first notch 121; the first notch 121 extends along a first direction;

[0047] The first direction can refer to the length direction of the battery, for example, it can be parallel to the X-axis direction in the coordinate system. Figure 1

[0048] The guide notch and the explosion-proof notch are respectively arranged on the same side or opposite sides of the body; the line connecting the ends of the two second notches 122 away from the first notch 121 is a line, and the area surrounded by the first notch 121, the two second notches 122 and the line is a pressure relief area 14,

[0049] The guide notch 13 coincides with the line, or the guide notch 13 is located on the side of the line away from the pressure relief area 14.

[0050] ​Specifically, the explosion-proof structure is usually applied to a lithium battery, and the shell of the battery usually comprises a shell with an opening and a cover plate arranged at the opening of the shell. The opening of the shell can be located at the top end, the side end or the bottom end of the shell, that is, the cover plate of the battery can be a top cover plate, a side cover plate or a bottom cover plate of the battery. The body of the explosion-proof structure can be the cover plate of the battery, or can be a side wall of the shell of the battery, as shown in Figure 1 and Figure 2 .

[0051] The part of the body in the pressure relief area 14 can be defined as an explosion-proof film, and the explosion-proof film is integrally formed with the body and is used to crack along the explosion-proof notch 12 to form an exhaust hole communicating the inside and outside of the battery when the internal pressure of the battery is greater than the pressure that the explosion-proof notch 12 can withstand.

[0052] Specifically, if the guide notch 13 coincides with the connecting line, the explosion-proof notch 12 and the guide notch 13 can enclose a fully enclosed area at this time, and the fully enclosed pressure relief area 14 is basically in the shape of a trapezoid.

[0053] If the guide notch 13 is located on the side of the connecting line away from the pressure relief area 14, the explosion-proof notch 12 and the guide notch 13 can enclose a semi-enclosed area at this time, that is, the guide notch 13 and the explosion-proof notch 12 are not directly communicated. The area enclosed by the explosion-proof notch 12 and the guide notch 13 can form an explosion-proof film, and when the explosion-proof notch 12 cracks under the internal pressure of the battery, the guide notch 13 can be used as a bending line mark, which is beneficial to the folding of the explosion-proof film relative to the body to increase the opening angle of the explosion-proof structure. In addition, the guide notch 13 only plays a role in guiding the folding of the explosion-proof film, which makes the explosion-proof film have a connection relationship with the body even after the explosion-proof notch 12 cracks, and will not fly out to avoid the explosion-proof film splashing and hurting adjacent other batteries or people. The explosion-proof notch 12 is usually a groove structure, and the groove structure is not formed in a recessed manner, but is formed by removing part of the structure of the body.

[0054] In the embodiment, the explosion-proof structure can be arranged on the shell of the battery or the cover plate of the battery, and the explosion-proof notch 12 and the guide notch 13 of the explosion-proof structure can be on the body 11. The explosion-proof notch 12 mainly includes a first notch 121 and two second notches 122, and the guide notch 13 and the explosion-proof notch 12 can be on the same surface or opposite surfaces of the body 11. The second notches 122 are arranged at both ends of the first notch 121, respectively. Therefore, the line between the two second notches 122 away from one end of the first notch 121 and the area surrounded by the first notch 121 and the two second notches 122 are the pressure relief area 14 of the explosion-proof structure during the explosion relief operation. The part of the explosion-proof structure in the pressure relief area 14 can form an explosion-proof membrane. The explosion-proof membrane is integrally formed on the shell or the cover plate of the battery. The explosion-proof structure can reduce the part processing and assembly process of the explosion-proof structure, improve the production efficiency and product qualification rate, and does not need to be thinned in the center area of the explosion-proof structure to facilitate the cracking of the explosion-proof structure, thereby improving the utilization rate of the body material.

[0055] In the related art, the explosion-proof structure can adopt the following scheme. For example, the explosion-proof structure mainly includes notches of straight line segments and two V-shaped segments arranged on the body, wherein each end of the straight line segment is provided with a corresponding V-shaped segment. When the explosion-proof structure is impacted by the internal gas pressure of the battery, the body first cracks from the straight line segment, and then extends to the V-shaped segments at both ends. When the body cracks in the straight line segment and the two V-shaped segments to generate an opening, the hot hazardous gas and electrolyte in the battery are ejected from the opening to achieve the exhaust pressure relief operation of the battery.

[0056] However, due to the uniform distribution of the structural strength of the areas on both sides of the straight line segment on the body, the opening angle of the explosion-proof structure is small, thereby resulting in a weak exhaust pressure relief effect of the battery.

[0057] Furthermore, the guide notch 13 can coincide with the line between the two second notches 122 away from the end of the first notch 121, or be on the side away from the pressure relief area 14 of the line, so that the strength of the part of the body in the pressure relief area 14 is weaker than the strength of the part of the body away from the pressure relief area 14 of the guide notch 13. When the battery exhausts and relieves pressure, the battery first tears from the first notch 121 and the second notch 122, and the part in the pressure relief area 14 (the explosion-proof membrane) is flipped and opened to form an opening with the guide notch 13 as the folding axis. Therefore, on the basis of reducing the explosion-proof opening pressure, the opening angle of the explosion-proof structure is effectively increased to ensure the exhaust pressure relief effect of the battery.

[0058] In addition, the battery can breathe in the pressure relief area 14 during normal operation, so that the area corresponding to the breathing effect of the battery in the utility model is smaller than the area between the straight line segment and the body edge in the prior art, thereby also helping the breathing effect of the battery.

[0059] Optionally, in combination with Figure 3 As shown in the figure, the groove depth of the guide notch 13 is less than the groove depth of the explosion-proof notch 12.

[0060] Specifically, the groove depth of the guide notch 13 refers to the depth of the guide notch 13 in the Z-axis direction of the coordinate system, and the groove depth of the explosion-proof notch 12 refers to the depth of the explosion-proof notch 12 in the Z-axis direction of the coordinate system. The residual thickness of the guide notch 13 can be represented by j, which can be greater than or equal to 0.2 mm. Figure 3 Figure 3 Specifically, the groove depth of the guide notch 13 refers to the depth of the guide notch 13 in the Z-axis direction of the coordinate system, and the groove depth of the explosion-proof notch 12 refers to the depth of the explosion-proof notch 12 in the Z-axis direction of the coordinate system. The residual thickness of the guide notch 13 can be represented by j, which can be greater than or equal to 0.2 mm.

[0061] In this optional embodiment, since the groove depth of the guide notch 13 is less than the groove depth of the first notch 121, the second notch 122 and the third notch 123 of the explosion-proof notch 12, it can be ensured that the battery is mainly torn from the explosion-proof notch 12 when venting and depressurizing, so as to reduce the possibility of tearing from the guide notch 13, and accordingly ensure that the explosion-proof film in the depressurization area 14 is flipped with the guide notch 13 as the folding axis. Since the residual thickness j of the guide notch 13 is greater than or equal to 0.2 mm, it can be ensured that the explosion-proof film can be folded by 90 degrees when the battery is vented and depressurized, and the residual piece after the explosion is retained on the body due to the connection with the guide notch 13.

[0062] Optionally, in combination with Figure 1 As shown in the figure, the size of the line between the ends of the two second notches 122 on the same side away from the first notch 121 matches the length of the guide notch 13.

[0063] Specifically, the length of the guide notch 13 can be represented by f, and the size of the line between the ends of the two second notches 122 on the same side away from the first notch 121 matches the length f of the guide notch 13, which means that the size of the line can be greater than, equal to or less than the length f of the guide notch 13, so that the explosion-proof film in the depressurization area 14 is in the same straight line with the end of the guide notch 13 at the end part near the two second notches 122 when the battery is vented and depressurized, so that the explosion-proof film is folded with the guide notch as the folding axis after depressurization to form an exhaust hole with a predetermined opening size, so as to ensure the venting and depressurizing effect of the battery.

[0064] Optionally, the body 11 has opposite outer and inner surfaces, and the guide notch 13 and the explosion-proof notch 12 are both on the outer surface.

[0065] Specifically, in combination with Figure 4 As shown in the figure, the guide notch 13 and the first notch 121, the two second notches 122 and the two third notches 123 of the explosion-proof notch 12 are all arranged on the outer surface of the body 11.​

[0066] Since the guide notch 13 and the explosion-proof notch 12 are both on the outer surface, the machining convenience of machining the guide notch 13 and the explosion-proof notch 12 on the body 11 can be improved.

[0067] Optionally, the body 11 has opposite outer surfaces and inner surfaces,

[0068] The guide notch 13 is on the outer surface, and the explosion-proof notch 12 is on the inner surface; or, the guide notch 13 is on the inner surface, and the explosion-proof notch 12 is on the outer surface; or, the guide notch 13 is on the inner surface, and the explosion-proof notch 12 is on the inner surface.

[0069] Specifically, as shown in Figure 5 The two guide notches 13 are on the outer surface of the body 11, the first notch 121, the two second notches 122, and the two third notches 123 of the explosion-proof notch 12 are on the inner surface of the body 11, and as shown in Figure 6 .

[0070] Specifically, as shown in Figure 7 The guide notch 13 and the first notch 121, the two second notches 122, and the two third notches 123 of the explosion-proof notch 12 are all arranged on the inner surface of the body 11.

[0071] As shown in Figure 8 The first notch 121, the two second notches 122, and the two third notches 123 of the explosion-proof notch 12 are on the outer surface of the body 11, and as shown in Figure 9 The two guide notches 13 are on the inner surface of the body 11.

[0072] Optionally, the guide notch 13 is a groove structure arranged on the body 11, the groove structure has an opening, the width of the guide notch 13 at the opening is 0.5-2.0 mm, the included angle is 15-30 degrees, and the residual thickness of the body 11 at the guide notch 13 is 0.15-0.3 mm.

[0073] Specifically, the guide notch 13 and the explosion-proof notch 12 can be machined on the body 11 by laser etching or stamping and marking, so that the guide notch 13 is a groove structure arranged on the body 11, and the groove structure has an opening at the end; the cross-sectional shape of the guide notch 13 in the plane where YZ is located in the coordinate system can be at least one of V-shaped, U-shaped, and W-shaped. Figure 11 The cross-sectional shape of the guide notch 13 in the plane where YZ is located in the coordinate system can be at least one of V-shaped, U-shaped, and W-shaped.

[0074] In this optional embodiment, as shown in Figure 3As shown, the width of the guide notch 13 at the opening is 0.5mm-2.0mm, the included angle i is 15-30 degrees, and the residual thickness j of the body 11 after processing the guide notch 13 is 0.15mm-0.3mm, so that the corresponding explosion-proof film of the pressure relief area 14 of the battery after explosion can be turned by 90 degrees, and the residual pieces after explosion can be retained on the body to avoid the explosion-proof film flying out to hurt other batteries or people. In addition, the included angle b of the first notch 121 is greater than or equal to 60 degrees, so as to facilitate the working head such as laser head or drill bit to work on the explosion-proof notch 12.

[0075] Optionally, in combination with Figure 10 and Figure 11 As shown, the body 11 includes a flat portion 111 and a recessed portion 112, the body 11 is recessed towards the inside of the body at the explosion-proof notch 12 to form the recessed portion 112, and the explosion-proof notch 12 and the guide notch 13 are arranged on the recessed portion 112.

[0076] Specifically, the explosion-proof notch 12 arranged on the body 11, or the explosion-proof notch 12 and the guide notch 13 are protruded towards the inside of the body 11, which refers to the inside of the battery.

[0077] The flat portion 111 refers to the part of the body 11 with explosion-proof structure and other adjacent side walls connected in the battery, and the recessed portion 112 refers to the part of the body 11 with explosion-proof structure and lower than the flat portion 111, wherein the recessed portion 112 can be substantially at the middle position of the body 11.

[0078] In the optional embodiment, since the explosion-proof notch 12 and the guide notch 13 are arranged on the recessed portion 112 lower than the flat portion 111, not only the mechanical strength at the flat portion 111 is ensured, but also the explosion-proof notch 12 and the guide notch 13 on the body 11 can be prevented from being touched or scratched by other components outside the battery.

[0079] Optionally, in combination with Figure 12 and Figure 13 As shown, the body 11 includes a flat portion 111 and a protruded portion 113, the body 11 is protruded towards the outside of the body at the explosion-proof notch 12 to form the protruded portion 113, and the explosion-proof notch 12 and the guide notch 13 are arranged on the protruded portion 113.

[0080] Specifically, the explosion-proof notch 12 arranged on the body 11, or the explosion-proof notch 12 and the guide notch 13 are protruded towards the outside of the body, which refers to the outside of the battery.

[0081] The boss part 113 refers to a part of the body 11 which protrudes from the flat part 111 and has an explosion-proof structure. The boss part 113 can be located substantially in the middle of the body 11.

[0082] In the optional embodiment, since the explosion-proof notch 12 and the guide notch 13 are arranged on the boss part 113 which protrudes from the flat part 111, the mechanical strength of the flat part 111 is ensured, and after the harmful gas or electrolyte is discharged from the exhaust hole of the explosion-proof structure, the gas can be quickly diffused to avoid accumulation at the explosion-proof notch 12, thereby improving the exhaust pressure relief effect of the battery.

[0083] Optionally, in combination with Figures 4 to 9 As shown, the explosion-proof notch 12 further includes two third notches 123, the two ends of the first notch 121 are respectively provided with the third notches 123, the third notches 123 and the second notches 122 are respectively located on the two sides of the first notch 121, the third notches 123 and the second notches 122 are arranged at an angle and the end portions thereof meet at the end portions of the first notch 121; the body 11 is provided with two guide notches 13, one of the guide notches 13 is symmetrically arranged on each side of the first notch 121.

[0084] Specifically, the explosion-proof notch 12 includes a first notch 121, two second notches 122 and two third notches 123, wherein the second notch 122 and the third notch 123 are arranged at each end of the first notch 121, and the second notch 122 and the third notch 123 are located on opposite sides of the first notch 121, the free ends of the two second notches 122 and the free ends of the two third notches 123 together constitute the free end of the explosion-proof notch 12.

[0085] The two second notches 122 are respectively arranged at the front and rear ends of the first notch 121 (i.e., the first notch 121 is located at the two ends of the X-axis direction in the figure), and the two third notches 123 are also respectively arranged at the front and rear ends of the first notch 121. Figure 4 The two second notches 122 are located on the left side of the first notch 121 (i.e., the first notch 121 is located on the positive side of the Y-axis in the figure), and the two third notches 123 are located on the right side of the first notch 121 (i.e., the first notch 121 is located on the negative side of the Y-axis in the figure). Figure 1 The end portions of the second notch 122 and the third notch 123 located at the front end of the first notch 121 meet at the front end of the first notch 121, and the end portions of the second notch 122 and the third notch 123 located at the rear end of the first notch 121 meet at the rear end of the first notch 121. Figure 1 The end portions of the second notch 122 and the third notch 123 located at the front end of the first notch 121 meet at the front end of the first notch 121, and the end portions of the second notch 122 and the third notch 123 located at the rear end of the first notch 121 meet at the rear end of the first notch 121.

[0086] The body 11 is provided with two guide marks 13, which are located on both sides of the first mark 121 (e.g., along the...). Figure 4 (Both sides in the Y-axis direction of the coordinate system); the line connecting the ends of the two second marks 122 away from the first mark 121, together with the first mark 121 and the two second marks 122, forms a pressure relief region 14, and one of the guide marks 13 coincides with this line or is located on the side of the line away from the pressure relief region 14 (e.g., on both sides of the Y-axis direction in the coordinate system); the area enclosed by the line, the first mark 121, and the two second marks 122 constitutes a pressure relief region 14, and one of the guide marks 13 coincides with this line or is located on the side of the line away from the pressure relief region 14 (e.g., on both sides of the Y-axis direction in the coordinate system); Figure 4 (On the side of the positive Y-axis). The line connecting the ends of the two third marks 123 away from the first mark 121, together with the first mark 121 and the two third marks 123, forms another pressure relief area 14. The other guide mark 13 coincides with this line or is located on the side of the line away from this other pressure relief area 14 (e.g., on the side of the positive Y-axis). Figure 4 (The side opposite to the Y-axis).

[0087] The first notch 121 can be a straight groove, a wavy groove, or a serrated groove extending along a set direction. In practical applications, for ease of processing, a straight groove is usually preferred for the first notch 121. The set direction can be the length direction of the body (i.e., the direction of the body's length). Figure 1 (in the X-axis direction) or width direction (i.e. Figure 1 (Y-axis direction in the text). The shape of the second notch 122 can be oblique, U-shaped, C-shaped, etc. Furthermore, the shapes of the second notch 122 and the third notch 123 can be the same or different. When the shapes of the second notch 122 and the third notch 123 are the same, they are usually symmetrically arranged on the left and right sides of the first notch 121. For example, in one example, such as... Figures 4 to 8 As shown, the second scribing mark 122 and the third scribing mark 123 are oblique and symmetrically arranged.

[0088] In this optional embodiment, the ends of the second slit 122 and the third slit 123 of the explosion-proof slit 12 meet at the end of the first slit 121, and the portion within the pressure relief area 14 enclosed by the first slit 121 and the second slit 122 located at both ends of the first slit 121 can be defined as the first valve, and the portion within the pressure relief area 14 enclosed by the first slit 121 and the third slit 123 located at both ends of the first slit 121 can be defined as the second valve, so that the explosion-proof film is composed of two valves, so as to protect the surrounding battery cells by using the two valves and blocking things such as high-temperature airflow and electrolyte from splashing onto the surrounding battery cells, thereby reducing the degree of contamination of the surrounding battery cells after the explosion-proof film is opened.

[0089] At the same time, by setting the length (indicated by the letter d) of the second score 122 and the third score 123 to be less than the length of the first score 121, the structural strength of the body 11 at the adjacent area of the second score 122 and the structural strength of the body 11 at the adjacent area of the third score 123 are both greater than the structural strength of the body at the first score 121, so that the first score 121 located at the center position becomes the weak point of the explosion-proof film, so that the explosion-proof film can be broken in the middle.

[0090] Optionally, the groove depth of the second score 122 and / or the third score 123 is greater than or equal to the groove depth of the first score 121.

[0091] In particular, since the groove depth of at least one of the second score 122 and the third score 123 is greater than or equal to the groove depth of the first score 121; in other words, the groove depth of the second score 122 or the groove depth of the third score 123 is greater than the groove depth of the first score 121; or, the groove depth of the second score 122 or the groove depth of the third score 123 is equal to the groove depth of the first score 121; or, the groove depth of the second score 122 and the groove depth of the third score 123 are both greater than the groove depth of the first score 121; or, the groove depth of the second score 122 and the groove depth of the third score 123 are both equal to the groove depth of the first score 121. Among them, in combination with Figure 3 As shown, the groove depth refers to the depth of the explosion-proof score 12 opened in the Z-axis direction of the coordinate system. Figure 3

[0092] If the groove depth of the second score 122 and the third score 123 is greater than the groove depth of the first score 121, in other words, the residual thickness of the second score 122 and the third score 123 is less than the residual thickness of the first score 121, that is, the structural strength of the body at the second score 122 and the third score 123 is weaker than the structural strength at the first score 121.

[0093] If the groove depth of the second score 122 and the third score 123 is equal to the groove depth of the first score 121, in other words, the residual thickness of the second score 122 and the third score 123 is equal to the residual thickness of the first score 121, that is, the structural strength of the body at the second score 122 and the third score 123 is basically the same as the structural strength at the first score 121.

[0094] The residual thickness (remaining material thickness) of the body at the explosion-proof score 12 is between 0.05mm and 0.15mm.

[0095] ​In the optional embodiment, if the groove depth of at least one of the second score line 122 and the third score line 123 is greater than the groove depth of the first score line 121, so that the structural strength of the body 11 at the second score line 122 and the third score line 123 is weaker than the structural strength at the first score line 121, when the battery fails and the internal pressure increases, the body 11 is first torn from the second score line 122 and the third score line 123 at both ends of the first score line 121, and if the explosion-proof film is still under pressure, the explosion-proof film can continue to tear along the first score line 121 to form an exhaust hole, that is, the explosion-proof film can be torn from both sides to the middle; or, if the groove depth of at least one of the second score line 122 and the third score line 123 is equal to the groove depth of the first score line 121, so that the structural strength of the body 11 at the second score line 122 and the third score line 123 is equal to the structural strength at the first score line 121, when the battery fails and the internal pressure increases, the body 11 can be torn from the second score line 122, the third score line 123 and the first score line 121 at both ends of the first score line 121 at the same time to form an exhaust hole. Both of the above-mentioned ways can make the explosion-proof film open in the preset direction.

[0096] In addition, if the remaining thickness of the body 11 at the explosion-proof score line 12 is too small, the structural strength of the connection between the explosion-proof film and the body 11 is small, which causes the explosion-proof film to be easily torn due to bumps or vibrations during transportation or vehicle driving, thereby causing the explosion-proof film to fail; on the contrary, the structural strength of the connection between the explosion-proof film and the body is large, which causes the explosion-proof pressure of the explosion-proof film to be large, and the explosion-proof score line 12 is not easy to tear. Therefore, in the embodiment, the thickness is set to be between 0.05mm and 0.15mm, so as to ensure that the connection between the explosion-proof film and the body has a certain strength, and at the same time, the explosion-proof pressure of the explosion-proof film is controlled within a suitable range, so as to facilitate the explosion-proof film to blow and exhaust.

[0097] Optionally, the included angle β formed by the second score line 122 and the third score line 123 is between 80° and 160°.

[0098] Specifically, the explosion-proof score line 12 is composed of the first score line 121, two second score lines 122 and two third score lines 123.

[0099] Since the included angle β formed by the second score 122 and the third score 123 is between 80° to 160°, if the included angle β of the second score 122 and the third score 123 is too small, the area of the corresponding explosion-proof film of the pressure relief area 14 is small, and then the exhaust hole formed after the explosion-proof film is cracked is small; on the contrary, it is easy to cause the exhaust hole formed after the explosion-proof film is cracked to be large, occupying a large area of the body 11, which is not conducive to the layout. Therefore, in the embodiment, the included angle β is set to be between 80° to 160°, so as to reduce the length of the explosion-proof score 12 in unit area and the layout of the explosion-proof film on the body, and at the same time, ensure that the exhaust hole formed after the explosion-proof film is cracked has a large enough opening area, so that the high-temperature gas in the battery can be quickly discharged, thereby improving the explosion-proof effect.

[0100] Wherein, the length e between the second score 122 and the third score 123 at the end of the first score 121 is greater than or equal to 9mm, which is equivalent to increasing the size of the explosion-proof structure in the direction of the X-axis of the coordinate system, so as to further increase the opening area of the exhaust hole of the explosion-proof film after cracking. Figure 14 The X-axis direction of the coordinate system.

[0101] The distance n between the two guide scores 13 can directly determine the area of the exhaust hole opened by the explosion-proof structure and the position of the explosion point.

[0102] Since the length of the score affects the structural strength of the body 11 at the score, for example, the longer the score, the smaller the structural strength at the score, therefore, the length of the second score 122 and the third score 123 is set to be less than the length of the first score 121, so that the structural strength of the body at the second score 122 and the structural strength of the body at the third score 123 are greater than the structural strength of the body at the first score 121, so that the first score 121 located at the center position becomes the weakest point of the explosion-proof film, and the explosion-proof film can be cracked at the center of the body 11.

[0103] The battery provided by the embodiment of the utility model comprises the explosion-proof structure as described in the above embodiment.

[0104] The battery in the embodiment further comprises a shell and a cover plate, the shell is a hollow shell structure with at least one open end, and the cover plate is sealed to the opening of the shell; and the explosion-proof structure is integrally formed on a side wall or a cover of the shell.

[0105] The battery of the embodiment has the same beneficial effects as the above-mentioned explosion-proof structure, which will not be repeated here.

[0106] The utility model embodiment provides a kind of electric equipment, including the battery as described in the above embodiment.

[0107] In the embodiment, the electric device can be, for example, an electric vehicle, a hybrid electric vehicle, an electric engineering vehicle, an electric ship, or the like in the transportation field, a mobile communication device, or the like, or a storage cabinet of an energy storage system, which is not limited herein.

[0108] The electric device of the embodiment has the same advantages as the battery described above, which is not repeated herein.

[0109] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only.The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. An explosion-proof structure, characterized by comprising: The body (11) is provided with an explosion-proof notch (12) and a guide notch (13); The explosion-proof notch (12) comprises a first notch (121) and two second notches (122), the two ends of the first notch (121) are respectively provided with the second notches (122), the second notches (122) are arranged at an angle with the first notch (121), and the two second notches (122) are located on the same side of the first notch (121); The line between the ends of the two second notches (122) away from the first notch (121) is a pressure relief area (14) surrounded by the first notch (121) and the two second notches (122), The guide notch (13) coincides with the line, or the guide notch (13) is located on the side of the line away from the pressure relief area (14).

2. The explosion-proof structure according to claim 1, characterized by The groove depth of the guide notch (13) is smaller than the groove depth of the explosion-proof notch (12).

3. The explosion-proof structure according to claim 1, characterized by The body (11) has opposite outer surfaces and inner surfaces, the guide notch (13) and the explosion-proof notch (12) are located on the outer surfaces.

4. The explosion-proof structure according to claim 1, wherein The body (11) has opposite outer surfaces and inner surfaces, The guide notch (13) is located on the outer surface, and the explosion-proof notch (12) is located on the inner surface; or the guide notch (13) is located on the inner surface, and the explosion-proof notch (12) is located on the outer surface; or the guide notch (13) is located on the inner surface, and the explosion-proof notch (12) is located on the inner surface.

5. The explosion-proof structure according to claim 3, wherein The guide notch (13) is a groove structure opened on the body (11), the groove structure has an opening, the width of the guide notch (13) at the opening is 0.5-2.0mm, the included angle is 15-30 degrees, and the residual thickness of the body (11) at the guide notch (13) is 0.15-0.3mm.

6. The explosion-proof structure according to claim 1, wherein The body (11) comprises a flat portion (111) and a recessed portion (112), the body (11) is recessed towards the inside of the body at the explosion-proof notch (12) to form the recessed portion (112), and the explosion-proof notch (12) and the guide notch (13) are arranged on the recessed portion (112).

7. The explosion-proof structure according to claim 1, wherein The body (11) comprises a flat portion (111) and a convex portion (113), the body (11) is convex towards the outside of the body at the explosion-proof notch (12) to form the convex portion (113), and the explosion-proof notch (12) and the guide notch (13) are arranged on the convex portion (113).

8. The explosion-proof structure according to any one of claims 1 to 7, characterized by The explosion-proof score (12) further comprises two third scores (123), the two ends of the first score (121) are respectively provided with the third score (123), the third score (123) and the second score (122) are respectively located on the two sides of the first score (121), the third score (123) and the second score (122) are arranged at an angle and the end portions thereof meet at the end portions of the first score (121); the body (11) is provided with two guide scores (13), the two guide scores (13) are symmetrically arranged relative to the first score (121).

9. The explosion-proof structure according to claim 8, characterized by The groove depth of the second score (122) and / or the third score (123) is greater than or equal to the groove depth of the first score (121).

10. The explosion-proof structure according to claim 8, characterized by The included angle β between the second score (122) and the third score (123) is between 80° and 160°.

11. A battery, characterized by The explosion-proof structure as claimed in any one of claims 1 to 10.

12. An electrical device, characterized by The battery as claimed in claim 11.

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