Integrally-formed explosion-proof battery shell and battery

Abstract

The utility model provides an integrally-formed anti-explosion battery shell and a battery, and relates to the technical field of batteries. The integrally-formed explosion-proof battery shell comprises a shell body and an explosion-proof structure formed on the shell body through stamping. The anti-explosion structure comprises a stamping groove, a first notch groove and a second notch groove, wherein the first notch groove and the second notch groove are formed in the bottom of the stamping groove. The first notch groove extends along the edge of the stamping groove, and the first notch groove is disconnected from the connecting part of the edge of the stamping groove. A to-be-blasted area is defined by the first notch grooves, and the to-be-blasted area can be folded along the connecting part when being impacted by external force. The second notch groove is formed in the to-be-blasted area and is close to the connecting part. Wherein the depth of the second notch groove is smaller than that of the first notch groove, and after the explosion-proof structure is exploded, the residual thickness value of the first notch groove can be calculated according to the residual thickness value of the second notch groove. The integrally-formed explosion-proof battery shell is simple in structure and convenient to process, and the residual thickness value of the first stamping groove can be traced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to an integrally-formed anti-explosion battery shell and battery. BACKGROUND

[0002] With the rise of new energy vehicles, lithium ion batteries are increasingly valued. Lithium ion batteries are usually provided with an anti-explosion valve. When the internal pressure of the battery reaches a certain threshold, the anti-explosion valve will automatically open to release the excessive gas pressure inside the battery, thereby preventing the battery shell from breaking or exploding.

[0003] At present, the anti-explosion valve is generally arranged on the battery cover plate. By arranging a circle of score lines on the battery cover plate, when the internal pressure of the battery reaches the trigger value, the anti-explosion valve will burst from the score lines to ensure the safety of the battery. However, such arrangement increases the number of parts of the battery and the subsequent assembly work. At the same time, after the anti-explosion valve bursts at the score lines, it is also impossible to trace whether the residual thickness value of the score lines of the anti-explosion valve is within the design range. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an integrally-formed anti-explosion battery shell and battery. The integrally-formed anti-explosion battery shell can trace the residual thickness value of the score lines of the anti-explosion valve after the anti-explosion valve bursts, and has a simple structure and is easy to process.

[0005] The first aspect of the present application provides an integrally-formed anti-explosion battery shell, comprising a shell and an anti-explosion structure formed on the shell by stamping; the anti-explosion structure comprises a stamping groove and a first score groove and a second score groove arranged at the groove bottom of the stamping groove; the first score groove extends along the edge of the stamping groove and is disconnected at the connecting part of the edge of the stamping groove, and the first score groove encloses a to-be-burst area which can be folded along the connecting part when subjected to external impact; the second score groove is arranged in the to-be-burst area and close to the connecting part; wherein the groove depth of the second score groove is smaller than the groove depth of the first score groove, and the second score groove is configured to calculate the residual thickness value of the first score groove according to the residual thickness value of the second score groove after the anti-explosion structure bursts.

[0006] In a possible implementation, the thickness of the groove bottom of the first score groove to the inner wall surface of the shell is a first thickness, and the thickness of the groove bottom of the second score groove to the inner wall surface of the shell is a second thickness, and the difference between the second thickness and the first thickness is in the range of 0.03mm-0.07mm.

[0007] In a possible implementation, the first thickness is in the range of 0.06mm-0.10mm, and the second thickness is in the range of 0.11mm-0.15mm.

[0008] In a possible implementation, the slot width of the second score groove is smaller than the slot width of the first score groove.

[0009] In a possible implementation, the anti-explosion structure further comprises a reinforcing structure arranged in the to-be-blasted region, the reinforcing structure being recessed or protruded from the bottom of the punching groove.

[0010] In a possible implementation, the reinforcing structure extends to the first notch, and the reinforcing structure avoids the connecting portion.

[0011] In a possible implementation, the reinforcing structure comprises a first reinforcing portion and a second reinforcing portion, the first reinforcing portion and the second reinforcing portion are both arc-shaped segments, the first reinforcing portion and the second reinforcing portion respectively extend from the center of the to-be-blasted region to opposite sides of the to-be-blasted region, and the first reinforcing portion and the second reinforcing portion are arranged to be tangent to each other.

[0012] In a possible implementation, the punching groove is a racetrack-shaped groove, the connecting portion is located at a straight segment of the punching groove, the second notch is arranged corresponding to the connecting portion, and the second notch is a straight notch parallel to the straight segment.

[0013] In a possible implementation, a cross-sectional shape of at least one of the first notch and the second notch is an inverted trapezoidal shape, an inverted triangular shape or an arc shape.

[0014] A second aspect of the present application provides a battery, comprising a battery cell and the anti-explosion battery shell.

[0015] The present application provides an integrally formed anti-explosion battery shell and a battery, comprising a shell body and an anti-explosion structure formed on the shell body by punching. The anti-explosion structure comprises a punching groove and a first notch and a second notch arranged on the bottom of the punching groove. The first notch extends along the edge of the punching groove, and the first notch is disconnected at a connecting portion of the edge of the punching groove. The first notch encloses a to-be-blasted region, which can be folded outward along the connecting portion when subjected to internal air pressure impact. The second notch is arranged in the to-be-blasted region and close to the connecting portion. The groove depth of the second notch is smaller than the groove depth of the first notch, and the second notch is configured to calculate the residual thickness value of the first notch according to the residual thickness value of the second notch after the anti-explosion structure is blasted.

[0016] In this way, by arranging the anti-explosion structure directly on the shell body, the anti-explosion pressure relief of the battery interior is realized without the need to introduce a battery cover body, and the structure is simple and easy to process. At the same time, since the second notch close to the connecting portion is arranged, the second notch has high strength and is not easy to deform due to the shallow groove depth and the close distance to the connecting portion of the edge of the punching groove. When the anti-explosion structure is blasted along the first notch, the actual residual thickness value of the first notch can be deduced according to the residual thickness value of the second notch. Thus, the blasting pressure of the anti-explosion structure can be verified in time, and the production process of the anti-explosion structure can be adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application. Those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 A perspective view of an integrally formed explosion-proof battery shell provided by an embodiment of the present application is shown in the figure.

[0019] Figure 2 A structural schematic view of an integrally formed explosion-proof battery shell provided by an embodiment of the present application is shown in the figure.

[0020] Figure 3 A perspective view of an integrally formed explosion-proof battery shell provided by an embodiment of the present application is shown in the figure. Figure 2 A sectional view of an integrally formed explosion-proof battery shell provided by an embodiment of the present application is shown in the figure.

[0021] Figure 4 A sectional view of an integrally formed explosion-proof battery shell provided by an embodiment of the present application is shown in the figure. Figure 3 A local enlarged view of A in the figure.

[0022] Figure 5 A perspective view of an explosion-proof structure provided by an embodiment of the present application is shown in the figure.

[0023] Figure 6 A structural schematic view of another integrally formed explosion-proof battery shell provided by an embodiment of the present application is shown in the figure.

[0024] Explanation of reference signs:

[0025] 100, explosion-proof structure; 110, punching groove; 111, connecting part; 120, first grooving; 130, second grooving; 140, reinforcing structure; 141, first reinforcing part; 142, second reinforcing part; 200, shell. DETAILED DESCRIPTION

[0026] Under the trend of vigorously promoting the development of new energy technology, new energy vehicles have begun to be widely popularized, and the battery is one of the core components of new energy vehicles. The battery converts chemical energy into electrical energy to provide power for new energy vehicles and ensure the normal operation of the vehicle. At the same time, the safety of the battery directly affects the safety of the new energy vehicle.

[0027] During the charging and discharging process of the battery, especially in the case of overcharging, overdischarging or high temperature environment, gas may be generated, which will increase the pressure inside the battery. The existing lithium ion battery usually sets an explosion-proof valve to discharge the pressure inside the battery. By setting the explosion-proof valve, when the internal pressure of the battery reaches a certain threshold, the explosion-proof valve will automatically open to release the excessive gas pressure inside the battery, thereby preventing the battery shell from rupturing or exploding.

[0028] The current battery, explosion-proof valve is generally provided on the battery cover plate. By setting a circle of engraved line on the battery cover plate, when the internal pressure of the battery reaches the trigger value, the explosion-proof valve is blown off from the engraved line to ensure the safety of the battery. However, such a setting increases the number of parts of the battery and the subsequent assembly work. At the same time, after the explosion-proof valve is blown off at the engraved line, it is also impossible to trace whether the residual thickness value of the engraved line of the explosion-proof valve is within the design range.

[0029] Therefore, the embodiment of the present application provides an integrally formed explosion-proof battery shell and a battery, which comprises a shell and an explosion-proof structure formed on the shell by stamping. The explosion-proof structure comprises a stamping groove and a first engraved groove and a second engraved groove provided at the bottom of the stamping groove. The first engraved groove extends along the edge of the stamping groove, and the first engraved groove is disconnected at the connecting part of the edge of the stamping groove, and the first engraved groove surrounds the to-be-blasted area, which can be folded along the connecting part under the impact of external force. The second engraved groove is provided in the to-be-blasted area and close to the connecting part. The groove depth of the second engraved groove is smaller than the groove depth of the first engraved groove, and the second engraved groove is configured to calculate the residual thickness value of the first engraved groove according to the residual thickness value of the second engraved groove after the explosion-proof structure is blown off, and the production process and design of the explosion-proof structure can be adjusted accordingly.

[0030] In this way, by directly setting the explosion-proof structure on the shell, the explosion-proof pressure relief in the battery is realized without introducing the battery cover body, the structure is simple and easy to process. At the same time, since the second engraved groove close to the connecting part is provided, when the explosion-proof structure is blown off along the first engraved groove, the second engraved groove is shallow and close to the connecting part of the edge of the stamping groove, so it is not easy to deform, and the actual residual thickness value of the first engraved groove can be deduced according to the groove depth of the second engraved groove. Therefore, the explosion pressure of the explosion-proof structure can be verified in time, and the production process of the explosion-proof structure can be adjusted according to the explosion pressure requirement.

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] Figure 1 A perspective view of an integrally formed explosion-proof battery shell provided by the embodiments of the present application is provided. Figure 2 A structural schematic view of an integrally formed explosion-proof battery shell provided by the embodiments of the present application is provided. Figure 3 A structural schematic view of an integrally formed explosion-proof battery shell provided by the embodiments of the present application is provided. Figure 2 A sectional view of an integrally formed explosion-proof battery shell provided by the embodiments of the present application is provided. Figure 4 A sectional view of an integrally formed explosion-proof battery shell provided by the embodiments of the present application is provided. Figure 3A magnified view of point A in the image.

[0033] Reference Figure 1 As shown, this application embodiment provides an integrally molded explosion-proof battery housing, which includes a housing 200 and an explosion-proof structure 100 integrally formed on the housing 200. The explosion-proof structure 100 is formed on the housing 200 by a stamping process. It should be noted that the explosion-proof structure 100 can be disposed at the bottom of the housing 200, or at the top of the housing 200, or both at the bottom and top of the housing 200; no specific limitation is made here.

[0034] In addition, as one embodiment, the housing 200 is square or cylindrical, and the housing 200 can be made of any one of aluminum, steel, or alloy materials.

[0035] Specifically, refer to Figure 2 As shown, the explosion-proof structure 100 includes a stamping groove 110 and a first groove 120 disposed at the bottom of the stamping groove 110. The first groove 120 extends along the edge of the stamping groove 110 and is disconnected from the connecting portion 111 at the edge of the stamping groove 110 (see reference). Figure 5 (As shown).

[0036] Because the first groove 120 is located at the bottom of the groove and has a certain depth and width, its structural strength is lower than that of other parts of the stamping groove 110. When the internal pressure of the battery reaches a critical value, the explosion-proof structure 100 will preferentially burst along the contour of the first groove 120. Furthermore, since the first groove 120 is disconnected from the connecting portion 111 at the edge of the stamping groove 110, the explosion-proof structure can still be connected to the housing 200 through the connecting portion 111 when the first groove 120 is burst open. It can be considered that the first groove 120 encloses the area to be bursted, and the area to be bursted can be folded along the connecting portion 111 when subjected to external impact.

[0037] For example, the shape of the stamping groove 110 can be racetrack-shaped, circular, or elliptical, and its shape is not specifically limited here. Correspondingly, the first groove 120 extending along the edge of the stamping groove 110 can also have a general outline of racetrack-shaped, circular, or elliptical, etc., and the first groove 120 breaks at the connecting portion 111 to form a non-closed structure.

[0038] Continue to refer to Figure 2 The explosion-proof structure 100 also includes a second groove 130, which is disposed in the area to be blasted and close to the connecting part 111. The groove depth of the second groove 130 is less than the groove depth of the first groove 120. The second groove 130 is configured to calculate the residual thickness of the first groove 120 based on the residual thickness of the second groove 130 after the explosion-proof structure 100 is blasted.

[0039] Since the second groove 130 is arranged in the to-be-blasted area, and the groove depth of the second groove 130 is shallower than the groove depth of the first groove 120, when the internal pressure of the battery reaches the preset range, the explosion-proof structure 100 will preferentially blast along the first groove 120, and such arrangement will reduce the influence of deformation on the second groove 130 when blasting.

[0040] Specifically, the second groove 130 can be arranged close to the connecting part 111. Since the explosion-proof structure 100 will be connected with the shell through the connecting part 111 after blasting, the structural strength of the area close to the connecting part 111 is better than other positions in the to-be-blasted area. At this time, the second groove 130 is less affected by the deformation caused by the blasting of the first groove 120, so that the depth of the second groove 130 can be measured, and the residual thickness value of the first groove 120 can be inferred through the preset relationship between the second groove 130 and the first groove 120 (for example, the process design of the first groove 120 and the second groove 130 can be designed on the same stamping punch during mold design, so as to ensure that the preset relationship between the first groove 120 and the second groove 130 is unchanged during processing), and the production process is further adjusted. For example, a plurality of explosion-proof structures 100 provided with different first grooves 120 and corresponding second grooves 130 are subjected to blasting test, the internal pressure of the battery shell 200 is adjusted to a plurality of test pressure values (such as the minimum value, the maximum value, the intermediate value, etc.) in the required blasting pressure range, and the depth range of the second groove 130 corresponding to the explosion-proof structure 100 blasted at the plurality of test pressure values in the required blasting pressure is recorded. Thus, the actual residual thickness value of the first groove which has been blasted and deformed can be deduced according to the preset relationship between the second groove 130 and the first groove 120, so as to verify whether the theoretical residual thickness value design is reasonable and guide the subsequent production process. Furthermore, the explosion-proof structure 100 corresponding to the residual thickness value of the first groove 120 within a reasonable range can meet the demand of blasting pressure, and the battery shell 200 meets the design requirements.

[0041] In this way, by directly arranging the explosion-proof structure 100 on the shell 200, the internal explosion pressure relief of the battery is realized without introducing the battery cover, the structure is simple, and the processing is convenient. At the same time, since the second groove 130 close to the connecting part 111 is arranged, when the explosion-proof structure 100 is blasted along the first groove 120, the second groove 130 has a shallow groove depth and is close to the connecting part 111 at the edge of the stamping groove 110, so the strength is high and deformation is not easy to occur. Thus, the actual residual thickness value of the first groove 120 can be deduced according to the measured groove depth of the second groove, and whether the production process and the theoretical residual thickness value design meet the design requirements can be judged.

[0042] As an implementation manner, refer to Figure 3 and Figure 4As shown, the thickness of the groove bottom of the first groove 120 to the inner wall surface of the shell 200 is a first thickness d1, and the thickness of the groove bottom of the second groove 130 to the inner wall surface of the shell is a second thickness d2. The difference between the second thickness d2 and the first thickness d1 can be set to a range of 0.03mm-0.07mm.

[0043] In this way, the second thickness and the first thickness have a significant difference, and the depth of the second groove is significantly smaller than the depth of the first groove. It can be ensured that the explosion-proof structure 100 will not affect the detection of the second groove 130 when it is exploded along the first groove 120. For example, when the difference between the second thickness d2 and the first thickness d1 is 0.05mm, after the explosion-proof structure 100 is broken, the groove depth of the second groove 130 can be measured first, then the groove depth of the second groove 130 and the difference value 0.05mm are added, which is the groove depth of the first groove 120 of the explosion-proof structure, and then the residual thickness value of the first groove 120 can be obtained by subtracting the groove depth of the first groove 120 from the wall thickness of the stamping groove 110, to determine whether the battery shell meets the design requirements.

[0044] As an embodiment, the first thickness d1 can be in the range of 0.06mm-0.10mm, and the second thickness d2 can be in the range of 0.11mm-0.15mm. For example, the first thickness d1 is 0.08mm, and the second thickness d2 is 0.13mm. Or, the first thickness d1 is 0.10mm, and the second thickness d2 is 0.15mm. Or, the first thickness d1 is 0.06mm, and the second thickness d2 is 0.11mm. Or, the first thickness d1 is 0.09mm, and the second thickness d2 is 0.14mm. In this way, it can be ensured that the first groove 120 can be successfully exploded, and the subsequent detection will not be affected by the too shallow groove depth of the second groove 130.

[0045] In some embodiments, the slot width of the second groove 130 is smaller than the slot width of the first groove 120. In this way, on the basis that the groove depth of the second groove 130 is smaller than the groove depth of the first groove 120, the slot width of the second groove 130 is also avoided to be too large. So as not to affect the stability of the area to be blasted at the second groove 130, and prevent the second groove 130 from tearing or even breaking due to the too large slot width after the area to be blasted is blasted. Thus, the structural stability of the second groove 130 can be further enhanced, and it can be ensured that the second groove 130 can reliably play the function of calculating the residual thickness value of the first groove.

[0046] As an implementation, the cross-sectional shape of at least one of the first groove 120 and the second groove 130 is inverted trapezoidal, inverted triangular or arc-shaped. For example, the cross-sectional shape of the first groove 120 and the second groove 130 are matched, and the cross-sectional shape of both is inverted trapezoidal, inverted triangular or arc-shaped. In this way, the width of the first groove 120 (or the second groove 130) gradually decreases from the groove opening to the groove bottom of the first groove 120 (or the second groove 130). In this way, the stress concentration that can be generated at the first groove (or the second groove) can be reduced, and the stability of the area to be blasted can be avoided.

[0047] As an implementation, the stamping groove 100 can be provided as a racetrack shape. Correspondingly, the first groove 120 is provided as a non-closed racetrack shape, the connecting portion 111 is located at the straight line segment of the stamping groove 110, the second groove 130 is provided corresponding to the connecting portion 111, and the second groove 130 is a straight groove parallel to the straight line segment. The following will be described in detail with the stamping groove 100 as a racetrack shape.

[0048] As an implementation, since the second groove 130 is parallel to the straight line segment of the stamping groove 110, that is, the second groove 130 is parallel to the connecting portion 111, the vertical distance between the second groove 130 and the connecting portion 111 can be greater than 3.5mm, and in this way, the influence on the structural strength of the connecting portion 111 due to the second groove 130 being too close to the connecting portion 111 can be avoided.

[0049] Figure 5 A perspective view of a blasting prevention structure according to an embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the blasting prevention structure 100 includes a stamping groove 110 provided in an area to be blasted, and the stamping groove 110 is provided with a first groove 120 and a second groove 130. Figure 5

[0050] By providing the reinforcing structure 140, the structural strength of the area to be blasted can be improved, and the deformation of the area to be blasted due to rubbing or other factors can be avoided, which can affect the normal use of the blasting prevention structure 100. At the same time, excessive deformation of the blasting prevention structure 100 after blasting can also be avoided, which can damage the structure of the second groove 130.

[0051] For example, the reinforcing structure 140 can be provided as a strip shape, a circular arc shape, a circular shape, or an elliptical shape, and the shape thereof is not limited herein.

[0052] ​As an implementation, the reinforcing structure 140 can extend to the connection with the first groove 120, and the reinforcing structure 140 avoids the connection part 111. In this way, the structural strength of the to-be-blasted area can be enhanced, the risk of affecting the detection of the second groove 130 after blasting can be reduced, and the safety and reliability of the explosion-proof structure 100 can be improved.

[0053] For example, the reinforcing structure 140 includes a first reinforcing part 141 and a second reinforcing part 142. The first reinforcing part 141 and the second reinforcing part 142 are both arc-shaped segments, the first reinforcing part 141 and the second reinforcing part 142 respectively extend from the center of the to-be-blasted area to opposite sides of the to-be-blasted area, and the first reinforcing part 141 and the second reinforcing part 142 are arranged to be tangent to each other. On this basis, the first reinforcing part 141 and the second reinforcing part 142 are recessed in the bottom of the stamping groove 110. It should be noted that the recess depth of the first reinforcing part 141 and the second reinforcing part 142 can be set as needed, and is not limited herein.

[0054] The first reinforcing part 141 extends from a first side where the connection part 111 intersects the first groove 120 to the other side where the connection part 111 intersects the first groove 120. It can be understood that the second groove 130 is arranged in the area surrounded by the first reinforcing part 141, the connection part 111 and the first groove 120.

[0055] In some embodiments, the groove depth of the first reinforcing part 141 is greater than the groove depth of the second groove 130 and less than the groove depth of the first groove 120. In this way, double insurance can be provided for the structural stability of the second groove 130, that is, even if the first groove 120 is blasted due to the impact of the internal gas pressure of the battery, the first reinforcing part 141 will deform first, thereby protecting the second groove 130 and not affecting the subsequent measurement.

[0056] Figure 6 Another structure diagram of an integrally formed explosion-proof battery shell is provided in the embodiments of the present application. Referring to Figure 6 To improve the success rate of the second groove 130 backtracking the groove depth of the first groove 120, a plurality of second grooves 130 can also be arranged in the to-be-blasted area. The plurality of second grooves 130 can be arranged in a plurality of areas surrounded by the first reinforcing part 141, the second reinforcing part 142, the first groove 120 and the connection part 111.

[0057] The embodiments of the present application also provide a battery including a cell and the explosion-proof battery shell in the above embodiments, and the cell is arranged in the explosion-proof battery shell.

[0058] The battery realizes explosion-proof pressure relief in the battery interior by directly arranging the explosion-proof structure 100 on the shell 200 without introducing a battery cover, and the structure is simple and convenient to process. Meanwhile, since the second notch 130 close to the connecting part 111 is arranged, when the explosion-proof structure 100 is broken along the first notch 120, the second notch has a shallow groove depth and is close to the connecting part of the stamping groove edge, and the strength is high and deformation is not easy to occur, so the actual residual thickness value of the first notch can be deduced according to the groove depth of the second notch.

[0059] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0060] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An integrally formed explosion-proof battery case, characterized by, The shell and the explosion-proof structure formed by stamping on the shell; The explosion-proof structure comprises a stamping groove and a first notch and a second notch arranged on the groove bottom of the stamping groove; the first notch extends along the edge of the stamping groove, and the first notch is disconnected from the connecting part of the edge of the stamping groove, the first notch surrounds the to-be-blasted area, and the to-be-blasted area can be folded along the connecting part under the impact of external force; the second notch is arranged in the to-be-blasted area and close to the connecting part; The groove depth of the second notch is less than the groove depth of the first notch, and the second notch is configured to calculate the residual thickness value of the first notch according to the residual thickness value of the second notch after the explosion-proof structure is blasted, so as to calculate the blasting pressure of the explosion-proof structure.

2. The integrally formed explosion-proof battery case of claim 1, wherein, The thickness of the groove bottom of the first notch to the inner wall surface of the shell is a first thickness, the thickness of the groove bottom of the second notch to the inner wall surface of the shell is a second thickness, and the difference between the second thickness and the first thickness ranges from 0.03mm to 0.07mm.

3. The integrally formed explosion-proof battery case of claim 2, wherein, The first thickness ranges from 0.06mm to 0.10mm, and the second thickness ranges from 0.11mm to 0.15mm.

4. The integrally formed explosion-proof battery case of any one of claims 1-3, wherein, The notch width of the second notch is less than the notch width of the first notch.

5. The integrally formed explosion-proof battery case of any one of claims 1-3, wherein, The explosion-proof structure further comprises a reinforcing structure arranged in the to-be-blasted area, and the reinforcing structure is recessed or protruded from the groove bottom of the stamping groove.

6. The integrally formed explosion-proof battery case of claim 5, wherein, The reinforcing structure extends to be connected with the first notch, and the reinforcing structure avoids the connecting part.

7. The integrally formed explosion-proof battery case of claim 5, wherein, The reinforcing structure comprises a first reinforcing part and a second reinforcing part, the first reinforcing part and the second reinforcing part are both arc segments, the first reinforcing part and the second reinforcing part respectively extend from the center of the to-be-blasted area to opposite sides of the to-be-blasted area, and the first reinforcing part and the second reinforcing part are arranged to be tangent to each other.

8. The integrally formed explosion-proof battery case of any one of claims 1-3, wherein, The stamping groove is a racetrack shape, and the connecting part is located on the straight line segment of the stamping groove; The second notch is arranged corresponding to the connecting part, and the second notch is a straight notch parallel to the straight line segment.

9. The integrally formed explosion-proof battery case of any one of claims 1-3, wherein, The cross-sectional shape of at least one of the first notch and the second notch is an inverted trapezoid, an inverted triangle or an arc.

10. A battery, characterized by The shell and the explosion-proof structure formed by stamping on the shell;

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