Anti-explosion sheet with Z-shaped fixing structure, battery top cover and power battery

Abstract

The utility model discloses an explosion-proof sheet with Z type fixed structure, battery top cover and power battery, including the sheet body part and be provided the pressure relief part on the sheet body part, the sheet body part is provided with the first surface and the second surface that are arranged oppositely, the pressure relief part is provided on the first surface, the pressure relief part is provided on the second surface, and the pressure relief part is provided on the second surface. The anti-explosion piece with the Z-shaped fixing structure further comprises a Z-shaped fixing part arranged on the periphery of the piece body part in a surrounding mode. The Z-shaped fixing part comprises a first extension section, an inclined section and a second extension section; the first extension section is integrally arranged outwards from the periphery of the sheet body part; the inclined section is formed by integrally extending outwards and upwards from the tail end of the first extension section; the second extension section is integrally arranged from the tail end of the inclined section and is parallel to the sheet body part; a first fixing surface on the same side as the first surface is formed on the second extension section, and the first fixing surface and the first surface are in different planes. Compared with the prior art, the matching degree of the explosion-proof sheet and the stainless steel top cover is high, and the safety performance is good.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to an explosion-proof sheet, a battery top cover and a power battery having a Z-shaped fixing structure. Background Technology

[0002] To reduce potential hazards during the use of power batteries, explosion-proof plates are usually installed on the battery top cover, such as... Figure 1 As shown, for the installation of a conventional explosion-proof plate 1, the existing top cover typically has a 0.5mm deep recess 2. Therefore, the conventional explosion-proof plate 1 usually uses 0.5mm thick MFX2 or 1060 aluminum as the base material to facilitate welding and fixing of the conventional explosion-proof plate 1 to the top cover. For convenient pressure relief, the conventional explosion-proof plate 1 usually has stamped notches 3. However, existing stamping dies for notches 1 are only suitable for stamping plates with a thickness of 0.3mm or less. Figure 2 As shown, in the manufacturing of traditional explosion-proof sheets 1, aluminum is usually stamped first, reducing the thickness of the aluminum material in the middle (to about 0.3mm) to facilitate the stamping of grooves using existing scribers. After stamping, a 0.5mm thick step 4 is retained around the aluminum material to fit the recessed platform 2. Currently, in order to increase the capacity of individual cells in power batteries to increase range and improve the safety performance of power batteries, most car manufacturers have begun to use stainless steel to manufacture the top cover. However, when existing aluminum explosion-proof sheets are assembled with stainless steel top covers, the melting points, densities, thermal conductivity, and coefficients of linear expansion of the two materials are different, resulting in different melting and cooling rates of aluminum and stainless steel. This can easily lead to cracks at the weld joint. Therefore, the use of stainless steel to manufacture explosion-proof sheets has been proposed.

[0003] However, since the hardness of stainless steel ranges from HV150 to 180, which is 5 times that of aluminum, the mold cannot stamp and score on 0.5mm thick stainless steel. It can only stamp and score within 0.3mm. Therefore, stainless steel cannot be stamped in advance like traditional aluminum explosion-proof sheets. Furthermore, since the depth of the recess 2 is 0.5mm, the stainless steel explosion-proof sheet cannot be directly fixed to the top cover. Therefore, it is urgent to develop and design a stainless steel explosion-proof sheet that can be adapted to the stainless steel top cover and can be made using existing processes. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an explosion-proof sheet, a battery top cover and a power battery with a Z-shaped fixing structure, so as to solve the problem that stainless steel explosion-proof sheets cannot be directly welded and fixed to the top cover in the prior art.

[0005] To achieve the above objectives, one technical solution of this utility model provides an explosion-proof disc with a Z-shaped fixing structure, including a disc body and a pressure relief portion disposed on the disc body. The disc body has a first surface and a second surface disposed opposite to each other. The pressure relief portion is disposed on the first surface. The explosion-proof disc with the Z-shaped fixing structure further includes a Z-shaped fixing portion surrounding the outer periphery of the disc body. The Z-shaped fixing portion includes a first extension section integrally disposed outward from the outer periphery of the disc body, an inclined section integrally formed extending outward and upward from the end of the first extension section, and a second extension section integrally disposed from the end of the inclined section and parallel to the disc body. A first fixing surface is formed on the second extension section on the same side as the first surface, and the first fixing surface is opposite to the first surface.

[0006] Furthermore, the first end of the inclined segment that is closer to the first extension segment transitions to the first extension segment in an arc shape. The first end of the inclined segment has a first concave arc surface tangent to the upper surface of the first extension segment and a first convex arc surface tangent to the lower surface of the first extension segment. The second segment of the inclined segment that is closer to the second extension segment transitions to the second extension segment in an arc shape. The second end of the inclined segment has a second convex arc surface tangent to the upper surface of the second extension segment and a second concave arc surface tangent to the lower surface of the second extension segment. The first concave arc surface and the second convex arc surface connect to form the inner peripheral surface of the inclined segment. The first convex arc surface and the second concave arc surface connect to form the outer peripheral surface of the inclined segment. The first fixing surface is formed on the upper surface of the second extension segment.

[0007] Furthermore, the sheet body and the Z-shaped fixing part are integrally formed by stamping using stainless steel of the same thickness, and the thickness of the sheet body and the Z-shaped fixing part is 0.25mm to 0.45mm.

[0008] Furthermore, the first vertical height difference between the first fixed surface and the second surface is 0.45mm to 0.65mm.

[0009] Furthermore, the pressure relief portion includes a first groove formed from a recess in the first surface and not penetrating the sheet portion, and at least one second groove. The first groove has a ring-shaped racetrack structure, and the second groove is located in the inner region of the first groove and intersects and communicates with the first groove.

[0010] Furthermore, the depth of the first notch is different from the depth of the second notch, and the depth of both the first and second notches is greater than half the thickness of the sheet portion.

[0011] Furthermore, the cross-sectional shape of the first and second notches is a trapezoid, "V" shape, or "U" shape, with the width gradually decreasing from top to bottom in the vertical direction from the first surface to the second surface.

[0012] To achieve the above objectives, another technical solution of this utility model provides a battery top cover, including a cover plate and an explosion-proof sheet fixed on the cover plate. The explosion-proof sheet is an explosion-proof sheet with a Z-shaped fixing structure as described above. A pressure relief hole is provided through the cover plate, and a fixing groove is recessed on the cover plate corresponding to the outer edge of the pressure relief hole. The sheet body is supported in the fixing groove by a second surface. The pressure relief part corresponds to the pressure relief hole in the axial direction, and the first fixing surface is fixedly connected to the fixing groove.

[0013] Furthermore, the fixing groove is defined as a stepped groove, the fixing groove having a support surface parallel to the second surface and a second fixing surface parallel to the first fixing surface, the support surface and the second fixing surface having a second vertical height difference and their projections on the horizontal projection plane do not overlap, when the explosion-proof sheet is assembled into the fixing groove, the second surface is supported on the support surface, and the end of the second extension abuts against the inner periphery of the fixing groove so that the first fixing surface and the second fixing surface are coplanar and in contact.

[0014] To achieve the above objectives, another technical solution of this utility model provides a power battery, including a battery casing and a battery top cover disposed on the battery casing. The battery casing is provided with an explosion-proof sheet having a Z-shaped fixing structure as described above and / or the power battery top cover is a battery top cover as described above.

[0015] This invention utilizes a stainless steel explosion-proof sheet, which is compatible with stainless steel covers, facilitating welding and fixing. Simultaneously, a Z-shaped fixing part is stamped around the outer periphery of the sheet body, creating a first fixing surface on the upper surface of the second extension section with a first vertical height difference in the axial direction from the first surface of the sheet body. This first fixing surface axially elevates the welding position of the explosion-proof sheet to a position coplanar with the second fixing surface within the cover plate's fixing groove. This facilitates welding of the first and second fixing surfaces, resulting in good stability and high safety. Furthermore, the different depths of the first and second notches in this invention make the second notch more prone to breakage than the first, ensuring the blade can tear outwards from the sheet body while preventing the blade from completely separating from the connecting section and flying out, further enhancing safety during use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the traditional combination of explosion-proof sheet and cover plate.

[0017] Figure 2 This is a cross-sectional view of a traditional explosion-proof sheet.

[0018] Figure 3 This is a schematic diagram of the structure of the explosion-proof sheet with L-shaped fixing structure of this utility model when it is combined with the cover plate (other structures of the top cover have been omitted).

[0019] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0020] Figure 5 This is a schematic diagram of the explosion-proof sheet with an L-shaped fixing structure according to this utility model.

[0021] Figure 6 for Figure 5 Internal sectional view.

[0022] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0023] The diagrams in the instruction manual are labeled as follows:

[0024] Traditional explosion-proof discs: 1. recessed platform; 2. notch; 3. step; 4.

[0025] Explosion-proof sheet 100, sheet body 110, first surface 111, second surface 112, main body section 113, connecting section 114, pressure relief section 120, first notch 121, second notch 122, Z-shaped fixing section 130, first extension section 131, inclined section 132, second extension section 133, first fixing surface 134, first concave arc surface 135, first convex arc surface 136, second concave arc surface 137, second convex arc surface 138;

[0026] Cover plate 200, pressure relief hole 210, fixing groove 220, supporting surface 221, second fixing surface 222;

[0027] First vertical height difference H1, second vertical height difference H2. Detailed Implementation

[0028] Example

[0029] This utility model discloses an explosion-proof sheet with a Z-shaped fixing structure. The explosion-proof sheet 100 is installed on the cover plate 200 of the battery top cover to release the gas inside the power battery in time when the internal gas expands and the pressure becomes too high, thus preventing the power battery from exploding. It is understood that in some other embodiments, the explosion-proof sheet 100 may also be installed on the battery casing to release the gas inside the power battery. In this embodiment, the explosion-proof sheet 100 has a sheet-like structure and is made of stainless steel with a thickness of 0.25mm to 0.45mm to adapt to existing stainless steel cover plates 200. The overall thickness of the explosion-proof sheet 100 is preferably 0.3mm to adapt to existing scoring stamping dies and processes. The following description uses the application of the explosion-proof sheet 100 on the battery top cover as an example. When the explosion-proof sheet 100 is applied to the battery casing, the following embodiments can also be used.

[0030] Please refer to Figure 3 and Figure 4 An embodiment of this utility model provides a battery top cover, including a cover plate 200 and an explosion-proof sheet 100 fixed on the cover plate 200. The cover plate 200 has a pressure relief hole 210 that connects the inner and outer spaces of the battery top cover. The cover plate 200 has a fixing groove 220 recessed on the outer edge corresponding to the pressure relief hole 210. The explosion-proof sheet 100 has a Z-shaped fixing structure so that it can be fixed in the fixing groove 220 and block the pressure relief hole 210. When the pressure inside the power battery increases, the pressure relief hole 210 acts on the explosion-proof sheet 100, causing the explosion-proof sheet 100 to rupture and release pressure, thus ensuring the safety of the power battery.

[0031] The fixing groove 220 is defined as a stepped groove. The fixing groove 220 has a support surface 221 and a second fixing surface 222 parallel to the explosion-proof sheet 100. The support surface 221 and the second fixing surface 222 have a second vertical height difference H2 and their projections on the horizontal projection plane do not overlap. In this embodiment, the fixing groove 220 is formed by a stamping process. The second vertical height difference H2 between the support surface 221 and the second fixing surface 222 is 0.45mm to 0.65mm, preferably 0.5mm, to accommodate the explosion-proof sheet 100. When the explosion-proof sheet 100 is assembled into the fixing groove 220, the second surface 112 of the explosion-proof sheet 100 faces the inside of the battery top cover and can be supported on the support surface 221 to block the pressure relief hole 210. The first surface 111 of the explosion-proof sheet 100 faces the outside of the battery top cover. The outer periphery of the explosion-proof sheet 100 abuts against the inner periphery of the fixing groove 220 and the corresponding position of the Z-shaped fixing structure of the explosion-proof sheet 100 is connected to the second fixing surface 222 to facilitate the fixing of the explosion-proof sheet 100 and the fixing groove 220. In specific implementation, there are various ways to fix the explosion-proof sheet 100 and the fixing groove 220, such as welding, bonding and other fixing methods. In this embodiment, welding is preferred.

[0032] Please refer to Figure 5 and Figure 6The explosion-proof sheet with a Z-shaped fixing structure in this embodiment includes a sheet body 110, a pressure relief part 120 disposed on the sheet body 110, and a Z-shaped fixing part 130 surrounding the outer periphery of the sheet body 110. The sheet body 110 has a first surface 111 and a second surface 112 disposed opposite to each other (that is, the first surface 111 and the second surface 112 of the explosion-proof sheet 100). In specific installation, the first surface 111 faces the outside of the power battery, and the second surface 112 faces the inside of the power battery and is supported on the support surface 221. The pressure relief part 120 is disposed on the first surface 111 and corresponds axially to the pressure relief hole 210. When the internal pressure of the power battery is too high, the sheet body 110 will rupture from the pressure relief part 120, thereby releasing the gas inside the power battery. In this embodiment, to facilitate the stamping of the pressure relief part 120, the sheet part 110 and the Z-shaped fixing part 130 are both integrally made of stainless steel with the same thickness, and the thickness of the sheet part 110 and the Z-shaped fixing part 130 is 0.25mm to 0.45mm, preferably 0.3mm.

[0033] The sheet portion 110 includes a main body segment 113 and a connecting segment 114 that surrounds the outer periphery of the main body segment 113 and is integrally formed with the main body segment 113. The outer periphery of the connecting segment 114 is integrally connected to the Z-shaped fixing portion 130. The main body includes a plurality of integrally formed blades (not shown). Due to the presence of the pressure relief portion 120, when the internal pressure of the power battery is too high, the pressure relief portion 120 tears, causing the blades to separate from each other and the main body segment 113 to separate from the connecting segment 114, so as to achieve the purpose of pressure relief.

[0034] The pressure relief section 120 includes a first notch 121 and at least one second notch 122 formed recessed from the first surface 111 and not penetrating the sheet portion 110. The first notch 121 and the second notch 122 are formed on the first surface 111 by stamping, so that the thickness at the location of the first notch 121 and the second notch 122 is thinner than the thickness at other locations of the sheet portion 110. Preferably, the depth of the first notch 121 and the second notch 122 is greater than half the thickness of the sheet portion 110, so that the first notch 121 and the second notch 122 are more sensitive to pressure than other locations of the sheet portion 110. Therefore, when the internal pressure of the power battery is too high, it will break first at the first notch 121 and the second notch 122 to release the gas inside the power battery and prevent the power battery from exploding. In this embodiment, the first notch 121 has a ring-shaped track structure and is formed between the main body segment 113 and the connecting segment 114 so as to separate the main body segment 113 and the connecting segment 114 when the first notch 121 breaks; the second notch 122 is located in the inner region of the first notch 121, that is, the second notch 122 is formed on the main body segment 113 and corresponds to each blade so as to separate each blade when the second notch 122 breaks. The depth of the first notch 121 is different from the depth of the second notch 122. In this embodiment, the depth of the first notch 121 is shallower than the depth of the second notch 122. Thus, when the pressure inside the power battery increases, the blade portion 110 is more likely to break at the second notch 122. When the second notch 122 breaks, on the one hand, due to the presence of the first notch 121, it is convenient for each blade to fold outward, thereby expanding the fracture opening to a larger extent. On the other hand, after the blade folds outward, the pressure inside the power battery is released, and the pressure acting on the blade decreases. The first notch 121 is less likely to break due to reduced force, thereby limiting the complete separation of the blade from the connecting section 114 and preventing the blade from flying outward, thereby increasing the safety of the power battery.

[0035] In this specific implementation, two second sipes 122 are provided. The two second sipes 122 are curved as a whole. The curve can be a hyperbola structure, a bracket structure (such as " " or "), or an "S" shape. The ends of the two second sipes 122 intersect and connect with the first sipe 121, while the middle parts of the two second sipes 122 move towards each other and connect (hyperbola structure, bracket structure) or the two second sipes 122 intersect and connect in the middle ("S" shape), so as to form staggered sipes to ensure that the blade can split under pressure. It is understood that in some other embodiments, the second sipes 122 can also be one, three, etc., and the second sipes 122 can also adopt a straight line structure, etc.

[0036] In this embodiment, the cross-sectional shape of the first notch 121 and the second notch 122 is a trapezoid with a width that gradually decreases from top to bottom in the vertical direction from the first surface to the second surface. This design allows the second side of the sheet portion 110 to bulge outwards when the internal pressure of the power battery is too high, causing the sheet portion 110 to expand outwards. This, in turn, allows the two opposite sidewalls (i.e., the two waists of the trapezoidal structure) of the first notch 121 and the second notch 122 to expand outwards. Since the first notch 121 and the second notch 122 are trapezoidal, and their two opposite sidewalls are inclined and open outwards, at the moment of explosion, the sheet portion... The 110 protrudes outward to compress the air outside the compression plate 110. This compressed air acts on the two opposite sidewalls of the first and second notches 121 and 122, providing a force that has a component pointing inwards towards the battery. The first and second notches 121 and 122, under the pressure from the battery's interior, also bear an outward force. These opposing forces act on the sidewalls and back of the notches, respectively, making the first and second notches 121 and 122 more prone to breakage, thus improving the safety of the battery. Understandably, in other embodiments, the cross-sections of the first and second notches 121 and 122 may also be "V"-shaped or "U"-shaped to achieve rapid breakage when the internal pressure of the battery is excessive.

[0037] Please refer to Figure 7The Z-shaped fixing part 130 is integrally formed outward from the outer periphery of the sheet portion 110. The Z-shaped fixing part 130 includes a first extension segment 131 integrally formed outward from the outer periphery of the sheet portion 110, an inclined segment 132 integrally formed extending outward and upward from the end of the first extension segment 131, and a second extension segment 133 integrally formed from the end of the inclined segment 132 and parallel to the sheet portion 110. The first extension segment 131 extends horizontally radially from the outer periphery of the sheet portion 110, and the inclined segment 132 extends radially outward and axially... The second extension segment 133 is formed at the end of the inclined segment 132. By setting the inclined segment 132, the second extension segment 133 can be raised axially relative to the first extension segment 131 to fit the fixing groove 220. The upper surface of the second extension segment 133 has a first fixing surface 134 on the same side as the first surface 111, that is, the first fixing surface 134 and the first surface 111 both face the same direction. The first fixing surface 134 is used to fix with the fixing groove 220, thereby fixing the explosion-proof sheet 100 on the cover plate 200. In this embodiment, the first fixing surface 134 is parallel to and opposite to the first surface 111, such that the first fixing surface 134 and the first surface 111 have a first vertical height difference H1 in the axial direction. The first vertical height difference H1 from the first fixing surface 134 to the second surface 112 is 0.45mm to 0.65mm, preferably 0.5mm, which is adapted to the second vertical height difference H2 between the support surface 221 and the second fixing surface 222. Thus, when the explosion-proof sheet 100 is installed in the fixing groove 220, the end of the second extension section 133 abuts against the inner circumference of the fixing groove 220, so that the first fixing surface 134 can be coplanar with the second fixing surface 222 and thus connect with it. This facilitates welding the first fixing surface 134 and the second fixing surface 222 to fix the explosion-proof sheet 100 into the fixing groove 220.

[0038] In this embodiment, the first end of the inclined segment 132 that is closer to the first extension segment 131 transitions to the first extension segment 131 in an arc shape. The first end of the inclined segment 132 has a first concave arc surface 135 that is tangent to the upper surface of the first extension segment 131 and a first convex arc surface 136 that is tangent to the lower surface of the first extension segment 131. This allows for a smooth transition between the inclined segment 132 and the first extension segment 131, preventing an excessively large bending angle between the inclined segment 132 and the first extension segment 131, which would reduce the overall hardness of the Z-shaped fixing part 130 and consequently lower the safety of the power battery. Similarly, the second segment of the inclined segment 132, which is closer to the second extension segment 133, transitions to the second extension segment 133 in an arc shape. The second end of the inclined segment 132 has a second convex arc surface 138 that is tangent to the upper surface of the second extension segment 133 and a second concave arc surface 137 that is tangent to the lower surface of the second extension segment 133. This allows for a smooth transition between the inclined segment 132 and the second extension segment 133, preventing the bending angle between the inclined segment 132 and the second extension segment 133 from being too large, which would further reduce the overall hardness of the Z-shaped fixing part 130 and thus further reduce the safety of the power battery. The first concave arc surface 135 and the second convex arc surface 138 are connected to form the inner peripheral surface of the inclined segment 132, and the first convex arc surface 136 and the second concave arc surface 137 are connected to form the outer peripheral surface of the inclined segment 132. In this way, while ensuring that a first fixing surface 134 with a first vertical height difference H1 with the first surface 111 is formed on the second extension segment 133, the Z-shaped fixing part 130 can be smoothly transitioned as a whole, with high adaptability to the fixing groove 220 and high safety performance.

[0039] In the molding process of the explosion-proof sheet with a Z-shaped fixing structure of this utility model, firstly, a stainless steel substrate with a thickness of 0.3mm is provided; then, the stainless steel substrate is positioned in a scoring stamping die, and a first scoring 121 and a second scoring 122 are formed on one surface of the stainless steel substrate by the scoring stamping die; finally, the periphery of the stainless steel substrate is stamped to form a Z-shaped fixing part 130. The Z-shaped fixing part 130 includes an integrally formed first extension 131, an inclined section 132 and a second extension 133. The end of the second extension 133 forms a first fixing surface 134, and the first fixing surface 134 has a height difference of 0.5mm with the other surface of the stainless steel substrate. When assembling the cover plate 200, the explosion-proof sheet with the Z-shaped fixing structure is placed with the fixing groove 220 of the cover plate 200 facing upward on a welding platform, and then the first surface 111 of the formed explosion-proof sheet 100 is placed with the first surface 111 facing upward on the fixing surface, so that the second surface 112 is supported on the support surface 221. At the same time, after the first fixing surface 134 and the second fixing surface 222 are connected, the first fixing surface 134 and the second fixing surface 222 are welded and fixed.

[0040] The explosion-proof disc 100 of this utility model with Z-shaped fixing structure is made of stainless steel and can be adapted to a cover plate 200 made of stainless steel, making it easy to weld and fix to the cover plate 200. At the same time, a Z-shaped fixing part 130 is stamped on the periphery of the disc body 110, so that the upper surface of the second extension 133 forms a first fixing surface 134 with a first vertical height difference H1 in the axial direction with the first surface 111 of the disc body 110. The first fixing surface 134 can lift the welding position of the explosion-proof disc 100 in the axial direction to a position coplanar with the second fixing surface 222 in the fixing groove 220 of the cover plate 200. In this way, it is convenient to weld the first fixing surface 134 and the second fixing surface 222, with good stability and high safety.

[0041] Furthermore, the different depths of the first notch 121 and the second notch 122 in this invention make the blade portion 110 more prone to breakage at the second notch 122. When the second notch 122 breaks, on the one hand, the presence of the first notch 121 facilitates the outward folding of each blade, thus expanding the fracture opening. On the other hand, after the blades fold outward, the internal pressure of the power battery is released, reducing the pressure acting on the blades. The first notch 121 experiences less force and is less prone to breakage, thereby limiting the complete separation of the blades from the connecting section 114 and preventing the blades from flying outward, thus increasing the safety of the power battery. Simultaneously, the first notch 121... The cross-sectional shape of the first notch 121 and the second notch 122 is such that the width gradually decreases from top to bottom in the vertical direction from the first surface to the second surface. At the moment of explosion, the air outside the sheet portion 110 acts on the two opposite sidewalls of the first notch 121 and the second notch 122, providing a component force into the power battery. The first notch 121 and the second notch 122 are subjected to an outward force due to the pressure inside the power battery. The internal and external forces act on the sidewalls and back of the notch, respectively, making the first notch 121 and the second notch 122 easier to break, thereby improving the safety of the power battery.

[0042] A preferred embodiment of this utility model also provides a power battery, including a battery housing and a battery top cover disposed on the battery housing, wherein the battery housing is provided with an explosion-proof sheet having a Z-shaped fixing structure as described above and / or the power battery top cover is a battery top cover as described above.

Claims

1. An explosion-proof disc having a Z-shaped fixing structure, comprising a disc body and a pressure relief portion provided on the disc body, the disc body having a first surface and a second surface oppositely arranged, the pressure relief portion being provided on the first surface, characterized in that, Further comprising a Z-shaped fixing part surrounding the outer periphery of the sheet part, the Z-shaped fixing part comprising a first extension part integrally provided outward from the outer periphery of the sheet part, an inclined part integrally extended outward and upward from the end of the first extension part, and a second extension part integrally provided from the end of the inclined part and parallel to the sheet part, the second extension part being formed with a first fixing surface on the same side as the first surface, the first fixing surface being out of plane with the first surface.

2. The explosion-proof sheet having a Z-shaped fixing structure according to claim 1, characterized in that, The first end of the inclined part closer to the first extension part is arc-shapedly transitioned to the first extension part, the first end of the inclined part having a first concave arc surface tangent to the upper surface of the first extension part and a first convex arc surface tangent to the lower surface of the first extension part, the second end of the inclined part closer to the second extension part is arc-shapedly transitioned to the second extension part, the second end of the inclined part having a second convex arc surface tangent to the upper surface of the second extension part and a second concave arc surface tangent to the lower surface of the second extension part, the first concave arc surface and the second convex arc surface are connected to form the inner periphery of the inclined part, the first convex arc surface and the second concave arc surface are connected to form the outer periphery of the inclined part, and the first fixing surface is formed on the upper surface of the second extension part.

3. The explosion-proof sheet having a Z-shaped fixing structure according to claim 1, characterized in that, The sheet part and the Z-shaped fixing part are integrally stamped from stainless steel materials with the same thickness, and the thickness of the sheet part and the Z-shaped fixing part is 0.25mm-0.45mm.

4. The explosion-proof sheet having a Z-shaped fixing structure according to claim 1, characterized in that, The first vertical height difference between the first fixing surface and the second surface is 0.45mm-0.65mm.

5. The explosion-proof sheet having a Z-shaped fixing structure according to claim 1, wherein The pressure relief part comprises a first score formed by being recessed from the first surface and not penetrating the sheet part, and at least one second score, the first score is in the shape of a ring-shaped runway structure, and the second score is located in the inner region of the first score and intersects and communicates with the first score.

6. The explosion-proof sheet having a Z-shaped fixing structure according to claim 5, characterized by, The depth of the first score is different from the depth of the second score, and the depth of the first score and the second score is greater than half the thickness of the sheet part.

7. The explosion-proof sheet having a Z-shaped fixing structure according to claim 5, characterized by, The cross-sectional shape of the first score and the second score is trapezoidal, "V-shaped" or "U-shaped" with the width gradually decreasing from top to bottom in the vertical direction from the first surface to the second surface.

8. A battery top cover comprising a cover plate and an explosion-proof sheet fixed on the cover plate, characterized in that, The explosion-proof sheet is the explosion-proof sheet with the Z-shaped fixing structure according to any one of claims 1-7, the cover plate is provided with a pressure relief hole penetrating through, the cover plate is recessed with a fixing groove corresponding to the outer edge of the pressure relief hole, the sheet part is supported in the fixing groove through the second surface, the pressure relief part corresponds to the pressure relief hole in the axial direction, and the first fixing surface is fixedly connected with the fixing groove.

9. The battery header of claim 8, wherein, The fixing groove is defined as a stepped groove, the fixing groove has a support surface parallel to the second surface and a second fixing surface parallel to the first fixing surface, the support surface and the second fixing surface have a second vertical height difference and the projections on the horizontal projection surface do not overlap, when the explosion-proof sheet is assembled into the fixing groove, the second surface is supported on the support surface, the end of the second extension part abuts against the inner periphery of the fixing groove to make the first fixing surface coplanar with the second fixing surface to be connected.

10. A power battery comprising a battery housing and a battery top cover arranged on the battery housing, characterized in that, The battery shell is provided with the anti-explosion sheet with the Z-shaped fixing structure according to any one of claims 1-7 and / or the power battery top cover is the battery top cover according to any one of claims 8-9.

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