Battery empty structure and battery

Abstract

This application relates to a battery clearance structure, including a casing, a base plate, an insulating film, and a battery cell. The insulating film has creases, and the insulating film is folded along the creases to form a bottom surface and a side surface. The base plate is attached to the bottom surface of the insulating film. The insulating film is used to wrap the battery cell and place the battery cell in the inner cavity of the casing. The inner cavity of the casing has a bottom wall and a side wall. The base plate is opposite to the bottom wall of the casing, and the side surface of the insulating film is opposite to the side wall of the casing. The distance between the edge of the base plate and the crease is L1, and the distance between the side surface of the insulating film and the side wall of the casing is L2. The casing has a chamfer with a radius of R, where L1 is greater than or equal to (R-L2). The base plate has a preset thickness D, and the base plate raises the height of the insulating film relative to the bottom wall of the casing through the preset thickness D. By adopting the above technical solution, L1 is greater than or equal to (R-L2), which can prevent the chamfer of the casing from squeezing the base plate, further preventing the base plate from deforming and squeezing the battery cell, thereby helping to protect the structural safety of the battery cell.

Description

Technical Field

[0001] This application relates to the technical field of battery structures, and in particular to a battery venting structure and a battery. Background Technology

[0002] In the field of battery structure technology, insulating films and base plates are important internal insulating structural components that play a crucial role in protecting the battery cells. The insulating film encases the battery cells, while the base plate supports the bottom of the insulating film. The battery cells are then mounted inside the battery casing via the insulating film and base plate.

[0003] However, the inner corners of the battery casing have rounded chamfers (often referred to as "R-angles"). In traditional technology, the cell is directly installed inside the battery casing using an insulating film and a base plate. This causes the base plate to abut against the chamfered corners of the battery casing. After the battery expands during cycling, the rounded chamfers compress the base plate, causing it to deform. The bending stress from the base plate is then transmitted to the internal cell, leading to deformation of the cell's electrode area and ultimately compromising the cell's structural safety. Therefore, the cell structure of traditional batteries has relatively low safety. Summary of the Invention

[0004] Therefore, it is necessary to provide a battery venting structure and battery to address the issue of low safety in the cell structure of traditional batteries.

[0005] On one hand, this application provides a battery clearance structure, including a housing, a base plate, an insulating film, and a battery cell. The insulating film has creases, and the insulating film is folded along the creases to form a bottom surface and a side surface. The base plate is attached to the bottom surface of the insulating film. The insulating film is used to wrap the battery cell and place the battery cell in the inner cavity of the housing. The inner cavity of the housing has a bottom wall and a side wall. The base plate is opposite to the bottom wall of the housing, and the side surface of the insulating film is opposite to the side wall of the housing. The distance between the edge of the base plate and the crease is L1, and the distance between the side surface of the insulating film and the side wall of the housing is L2. The housing has a chamfer with a radius of R, wherein L1 is greater than or equal to (R-L2). The base plate has a preset thickness D, and the base plate raises the height of the insulating film relative to the bottom wall of the housing through the preset thickness D.

[0006] By employing the above technical solution, L1 is made greater than or equal to (R-L2), thus preventing the edge of the base plate from contacting the chamfer of the casing. During battery cycling and cell expansion, the base plate will not be squeezed by the chamfer as it moves towards the bottom wall of the casing, preventing the bending stress of the base plate from being further transmitted to the battery cell and protecting the cell structure. Furthermore, by setting a preset thickness D, the base plate raises the height of the insulating film relative to the bottom wall of the casing, allowing the cell to contact the chamfer at a reasonable position at the crease of the insulating film; or ensuring that the cell completely avoids contact with the chamfer at the crease of the insulating film, further protecting the cell structure.

[0007] In one embodiment, the preset thickness D is greater than or equal to the radius of the chamfer.

[0008] In one embodiment, the preset thickness D ranges from 0.6 mm to 0.8 mm.

[0009] In one embodiment, the base plate has at least two grooves, and the insulating film has protrusions that correspond to the number and position of the grooves. When the base plate and the bottom surface of the insulating film are attached to each other, the protrusions are engaged with the grooves.

[0010] In one embodiment, the base plate is rectangular, and the groove includes two positioning grooves and six reinforcing grooves. The two positioning grooves are symmetrically arranged on both sides of the middle part of the base plate, and the six reinforcing grooves are evenly distributed around the two positioning grooves on the base plate.

[0011] In one embodiment, the distance between the lowest point of the groove and the bottom surface of the base plate is d1, and the distance between the highest point of the protrusion and the top surface of the insulating film is d2, where d1=d2.

[0012] In one embodiment, the groove surface and the protrusion surface are interlocking hemispherical or semi-ellipsoidal arc surfaces.

[0013] In one embodiment, the insulating film and the base plate are thermally bonded together.

[0014] In one embodiment, the corner of the battery cell is provided with a clearance angle, which is used to increase the height of the contact position between the battery cell and the chamfer relative to the bottom wall of the housing.

[0015] On the other hand, this application also provides a battery, which includes a casing, a base plate, an insulating film and a battery cell, and the battery adopts the above-mentioned battery air-proof structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the battery structure in one embodiment of this application.

[0017] Figure 2 for Figure 1 The diagram shows an enlarged view of the existing structure at point A in the battery shown.

[0018] Figure 3 for Figure 1 The diagram shown is an enlarged view of the battery venting structure at point A, according to an embodiment of this application.

[0019] Figure 4 for Figure 1 The diagram shows an enlarged view of the battery venting structure at point A, according to another embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the structure of the insulating film and the base plate in one embodiment of this application.

[0021] Figure 6 This is a schematic diagram of the assembly of the insulating film and the base plate in one embodiment of this application.

[0022] Figure 7 This is a schematic diagram of the structure of the base plate in one embodiment of this application.

[0023] Figure 8 For this application Figure 1 The diagram shown is an enlarged view of the battery venting structure at point A, according to another embodiment of this application.

[0024] Explanation of icon numbers

[0025] 10. Battery; 11. Battery clearance structure; 100. Shell; 110. Chamfer; 120. Bottom wall; 130. Side wall; 200. Bottom support plate; 210. Groove; 211. Positioning groove; 212. Reinforcing groove; 300. Insulating film; 310. Protrusion; 300a. Crease; 400. Battery cell; 410. Clearance angle. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] See Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of battery 10 in one embodiment of this application; Figure 2 for Figure 1 The diagram shows an enlarged view of the prior art structure at point A in the battery 10 shown.

[0033] First, combine Figure 2 As shown, in the prior art, the structure of the battery 10 at point A includes a casing 100, a base plate 200, an insulating film 300, and a battery cell 400. The insulating film 300 wraps around the battery cell 400, the casing 100 has a chamfer 110, and the base plate 200 is attached to the bottom surface of the insulating film 300. After the battery 10 has been cycled, the battery cell 400 wrapped by the insulating film 300 will expand. Since the base plate 200 is attached to the bottom surface of the insulating film 300, the base plate 200 will move towards the bottom wall 120 of the casing 100 as the battery cell 400 expands, eventually touching the bottom wall 120 of the casing 100. However, since the edge of the base plate 200 abuts against the chamfer 110 of the housing 100, as the base plate 200 moves towards the side closer to the bottom wall 120 of the housing 100, the chamfer 110 of the housing 100 will compress the base plate 200, causing it to bend and deform at the chamfer 110. The bending stress of the base plate 200 will be further transmitted to the internal battery cell 400, causing deformation of the electrode area of ​​the battery cell 400, thereby damaging the battery cell 400.

[0034] Specifically, the bending deformation stress of the base plate 200 causes the extrusion deformation of the battery cell 400 to have at least the following two hazards. First, vibration during transportation or use of the battery cell 400 can cause the active particles on the electrode to fall off. After falling off, the active particles will pass through the gaps in the base plate 200 and corrode the housing 100, while also causing a decrease in the capacity of the battery cell 400. Second, the electrode of the battery cell 400 will wrinkle after being squeezed by the chamfer 110. The wrinkles may further develop into lithium plating (lithium plating is a loss condition that may occur in the lithium-ion battery 10 during charging) and internal short circuits, thus seriously affecting the service life and safety of the battery 10.

[0035] To address the aforementioned technical problems, this application provides a battery clearance structure 11. The battery clearance structure 11 of this application can reduce or prevent the chamfer 110 of the casing 100 from pressing against the base plate 200, thereby helping to improve the structural safety of the battery 10.

[0036] See Figure 3 and Figure 4 , Figure 3 This paper shows a schematic diagram of the battery venting structure 11 in one embodiment of the present application; Figure 4 A schematic diagram of the battery venting structure 11 is shown in another embodiment of this application.

[0037] Combination Figure 3 As shown, in one embodiment, the battery clearance structure 11 of this application includes a housing 100, a bottom support plate 200, an insulating film 300, and a battery cell 400. The insulating film 300 has a crease 300a, and the insulating film 300 is folded along the crease 300a to form a bottom surface and a side surface. The bottom support plate 200 is attached to the bottom surface of the insulating film 300. The insulating film 300 is used to wrap the battery cell 400 and place the battery cell 400 in the inner cavity of the housing 100. The inner cavity of the housing 100 has a bottom wall 120 and a side wall 130. The bottom support plate 200 is opposite to the bottom wall 120 of the housing 100. The side of the insulating film 300 is opposite to the side wall 130 of the housing 100. The distance between the edge of the bottom support plate 200 and the crease 300a is L1. The distance between the side of the insulating film 300 and the side wall 130 of the housing 100 is L2. The housing 100 has a chamfer 110 with a radius of R, wherein L1 is greater than or equal to (R-L2). The bottom support plate 200 has a preset thickness D. The bottom support plate 200 raises the height of the insulating film 300 relative to the bottom wall 120 of the housing 100 by the preset thickness D.

[0038] By adopting the above technical solution, L1 is greater than or equal to (R-L2), thus preventing the edge of the base plate 200 from contacting the chamfer 110 of the casing 100. After the battery cell 400 expands due to cyclic use of the battery 10, the base plate 200 will not be squeezed by the chamfer 110 during its movement towards the bottom wall 120 of the casing 100. This prevents the bending deformation stress of the base plate 200 from being further transmitted to the battery cell 400 inside the battery 10, protecting the structural safety of the battery cell 400. Furthermore, by setting a preset thickness D, the base plate 200 raises the height of the insulating film 300 relative to the bottom wall 120 of the casing 100, allowing the battery cell 400 to contact the chamfer 110 at a reasonable position at the crease 300a of the insulating film 300; or ensuring that the battery cell 400 completely avoids contact with the chamfer 110 at the crease 300a of the insulating film 300, further protecting the structural safety of the battery cell 400.

[0039] It should be noted that the above-mentioned "reasonable position" refers to the position where, after the bottom height of the insulating film 300 is raised, the battery cell 400 is not squeezed by the chamfer 110 at the crease 300a of the insulating film 300; or the position where, even if the battery cell 400 is squeezed by the chamfer 110 at the crease 300a of the insulating film 300, it will not cause excessive interference to the battery cell 400.

[0040] Optionally, in some embodiments, the preset thickness D of the bottom support 200 is greater than or equal to the radius of the chamfer 110 of the housing 100. This can raise the bottom surface height of the insulating film 300 to a height greater than or equal to R relative to the bottom wall 120 of the housing 100, thereby preventing the battery cell 400 from contacting the chamfer 110 at the crease 300a of the insulating film 300, and preventing it from being squeezed by the chamfer 110, which helps to protect the structural safety of the battery cell 400.

[0041] Furthermore, considering the comprehensive factors of balancing the cost of the battery cell 400, the internal space of the casing 100, the safety of the battery cell 400, and actual operating conditions, the applicant found that, provided the distance L1 between the edge of the base plate 200 and the crease 300a is greater than or equal to (R-L2), it is possible to ensure that the base plate 200 is not squeezed by the chamfer 110, thus eliminating the impact of base plate 200 deformation on the battery cell 400. If the thickness of the base plate 200 is slightly reduced to a reasonable range, even if the battery cell 400 is affected by the squeeze of the chamfer 110, it will not cause excessive interference to the performance and safety of the battery cell 400, and economic benefits can be maximized.

[0042] It should be noted that this application's Figure 3 and Figure 4 The diagrams show the structure before and after the chamfer 110 compression when the preset thickness D of the base plate 200 is less than the radius R of the chamfer 110.

[0043] Combination Figure 3 and Figure 4 As shown, in some embodiments, the preset thickness D of the base plate 200 ranges from 0.6mm to 0.8mm. The applicant has found that setting the preset thickness D of the base plate 200 to 0.6mm-0.8mm allows the height of the insulating film 300 relative to the bottom wall 120 of the housing 100 to be raised to a reasonable range. Within this range, even if the cell 400 is compressed by the chamfer 110 at the crease 300a of the insulating film 300, it will not cause excessive interference to the cell 400. Furthermore, setting the preset thickness D of the base plate 200 to 0.6mm-0.8mm allows for compatibility with most battery specifications 10, thus improving the application range of the battery clearance structure 11 of this application.

[0044] Specifically, in some embodiments, the preset thickness D of the base plate 200 can be 0.6 mm; in other embodiments, the preset thickness D of the base plate 200 can be 0.7 mm; and in still other embodiments, the preset thickness D of the base plate 200 can be 0.8 mm.

[0045] See Figures 5 to 7 , Figure 5 This is a schematic diagram of the structure of the insulating film 300 and the base plate 200 in one embodiment of this application. Figure 6 This is a schematic diagram of the assembly of the insulating film 300 and the base plate 200 in one embodiment of this application. Figure 7 This is a schematic diagram of the structure of the base plate 200 in one embodiment of this application.

[0046] In some embodiments, the insulating film 300 and the base plate 200 are thermally bonded together, which can improve the adhesion effect between the insulating film 300 and the base plate 200.

[0047] Furthermore, combined Figure 5 and Figure 6 As shown, in some embodiments, the base plate 200 is provided with at least two grooves 210, and the insulating film 300 is provided with protrusions 310 corresponding to the number and position of the grooves 210. When the bottom surface of the base plate 200 and the insulating film 300 are attached to each other, the protrusions 310 are correspondingly engaged with the grooves 210. This can increase the relative sliding resistance between the insulating film 300 and the base plate 200, thereby improving the adhesion effect between the base plate 200 and the insulating film 300.

[0048] Specifically, the insulating film 300 and the base plate 200, as important insulating structural components inside the battery cell 400, play a crucial role in protecting the battery cell 400. However, in the prior art, the heat-fusion process between the insulating film 300 and the base plate 200 is relatively complex and is affected by factors such as temperature, pressure, and materials. If the heat fusion between the insulating film 300 and the base plate 200 is insufficient, the base plate 200 may slide relative to the insulating film 300 during transportation and use of the battery 10. In severe cases, this can cause the base plate 200 and the insulating film 300 to detach due to insufficient heat fusion, seriously affecting the service life and safety of the battery 10. In this embodiment, the insulating film 300 is provided with a protrusion 310, and the base plate 200 is provided with a groove 210. The protrusion 310 is correspondingly engaged with the groove 210 of the base plate 200, which helps to reduce the probability of the base plate 200 sliding relative to the insulating film 300 and improves the structural safety of the battery cell 400.

[0049] Preferably, in some embodiments, the surfaces of the groove 210 and the protrusion 310 are mutually interlocking hemispherical or semi-ellipsoidal arc surfaces, which can further improve the fitting effect between the groove 210 and the protrusion 310.

[0050] Combination Figure 7 As shown, in some embodiments, the base plate 200 is rectangular, and the groove 210 includes two positioning grooves 211 and six reinforcing grooves 212. The two positioning grooves 211 are symmetrically arranged on both sides of the middle part of the base plate 200, and the six reinforcing grooves 212 are evenly distributed around the two positioning grooves 211 on the base plate 200. This helps to improve the all-round connection stability between the base plate 200 and the insulating film 300.

[0051] Continue to combine Figure 6 As shown, in some embodiments, the distance between the lowest point of the groove 210 and the bottom surface of the base plate 200 is d1, and the distance between the highest point of the protrusion 310 and the top surface of the insulating film 300 is d2, where d1=d2. This ensures that the thickness of the base plate 200 and the insulating film 300 is consistent at the snap-fit ​​position of the protrusion 310 and the groove 210, thereby improving the heat-fusion effect.

[0052] Specifically, the groove 210 of the base plate 200 and the protrusion 310 of the insulating film 300 can serve as the locking position between the two, reducing the chance of relative sliding; on the other hand, they can also serve as the melting point between the two. By setting d1=d2, it can be ensured that the thickness of the base plate 200 and the insulating film 300 is consistent at the melting point, eliminating the problem of excessive difference in heat-melted thickness.

[0053] It should be noted that when the difference in heat-melting thickness is too large, it will lead to uneven heat transfer during heat melting. That is, one part of the heat-melting area may be overheated, while another part may not reach the appropriate melting temperature. Furthermore, when the difference in heat-melting thickness is too large, it may also cause deformation or cracking of the insulating film 300 or the base plate 200. Because the thickness difference between the insulating film 300 and the base plate 200 is inconsistent during the heat melting process, their thermal expansion and contraction will be inconsistent, which will cause deformation or cracking of the insulating film 300 or the base plate 200.

[0054] Therefore, in the traditional hot-melt process of the insulating film 300 and the base plate 200, if the process parameters are not properly matched, problems such as over-melting and stringing of the insulating film 300 and hot-melt protrusions 310 of the insulating film 300 can easily occur. Furthermore, the protrusions 310 and strings of the hot-melt insulating film 300 can easily pierce into the core package of the battery cell 400, causing defects such as puncture of the separator inside the core package and powder shedding from the electrode sheets.

[0055] In this embodiment, the application reduces the difference in heat-melting thickness between the insulating film 300 and the base plate 200 by setting d1=d2. This helps to reduce the difficulty of heat melting and prevents the insulating film 300 from over-melting and forming fibers, as well as the phenomenon of heat-melting protrusion 310 of the insulating film 300, thereby improving the heat melting effect and enhancing the structural safety of the battery 10.

[0056] In some embodiments, the insulating film 300 is made of PP (polypropylene), PC (polycarbonate), PET (polyethylene terephthalate), or PVC (polyvinyl chloride); the base plate 200 is made of PP (polypropylene), PC (polycarbonate), PET (polyethylene terephthalate), or PVC (polyvinyl chloride).

[0057] See Figure 8 , Figure 8 For this application Figure 1 The diagram shows an enlarged view of the battery clearance structure 11 at point A in another embodiment of the present application in the battery 10 shown.

[0058] Combination Figure 8 As shown, in some embodiments, the corner of the battery cell 400 is provided with a clearance angle 410. The clearance angle 410 is used to increase the height of the position where the battery cell 400 abuts against the chamfer 110 relative to the bottom wall 120 of the housing 100. This can further reduce the squeezing effect of the chamfer 110 on the battery cell 400 and protect the structural safety of the battery cell 400.

[0059] Specifically, the battery cell 400 is made by winding positive and negative electrode plates together. By reducing the size of the outermost few turns of the electrode plates, the clearance angle 410 at the corner of the battery cell 400 can be achieved. Preferably, the clearance angle 410 can be achieved by reducing the size of the outermost 2-4 turns of the electrode plates in the battery cell 400.

[0060] This application also provides a battery 10, which includes a casing 100, a base plate 200, an insulating film 300, and a battery cell 400. The battery 10 adopts the aforementioned battery clearance structure 11. Specifically, in some embodiments, the battery cell 400 can be a lithium battery cell, wherein the casing 100 is an aluminum casing, and the insulating film 300 is a Mylar film (polyester film, also known as Mylar paper or insulating tape).

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery venting structure, characterized in that, The battery clearance structure includes a housing, a base plate, an insulating film, and a battery cell. The insulating film has creases, and the insulating film is folded along the creases to form a bottom surface and a side surface. The base plate is attached to the bottom surface of the insulating film. The insulating film is used to wrap the battery cell and place the battery cell inside the housing. The inner cavity of the housing has a bottom wall and a side wall. The base plate is opposite to the bottom wall of the housing, and the side surface of the insulating film is opposite to the side wall of the housing. The distance between the edge of the base plate and the crease is L1. The distance between the side of the insulating film and the side wall of the housing is L2. The housing has a chamfer with a radius of R, where L1 is greater than or equal to (R-L2). The bottom support has a preset thickness D. The bottom support raises the height of the insulating film relative to the bottom wall of the housing by the preset thickness D. The preset thickness D is greater than or equal to the radius of the chamfer. The corner of the battery cell is provided with a clearance angle. The clearance angle is used to increase the height of the contact position between the battery cell and the chamfer relative to the bottom wall of the housing.

2. The battery ventilation structure according to claim 1, characterized in that, The insulating film is made of PP, PC, PET, or PVC; the base plate is made of PP, PC, PET, or PVC.

3. The battery ventilation structure according to claim 1, characterized in that, The preset thickness D ranges from 0.6mm to 0.8mm.

4. The battery venting structure according to claim 1, characterized in that, The base plate has at least two grooves, and the insulating film has protrusions that correspond to the number and position of the grooves. When the base plate and the bottom surface of the insulating film are attached to each other, the protrusions are engaged with the grooves.

5. The battery ventilation structure according to claim 4, characterized in that, The base plate is rectangular, and the groove includes two positioning grooves and six reinforcing grooves. The two positioning grooves are symmetrically arranged on both sides of the middle part of the base plate, and the six reinforcing grooves are evenly distributed around the two positioning grooves on the base plate.

6. The battery ventilation structure according to claim 4, characterized in that, The distance between the lowest point of the groove and the bottom surface of the base plate is d1, and the distance between the highest point of the protrusion and the top surface of the insulating film is d2, where d1=d2.

7. The battery venting structure according to any one of claims 4-6, characterized in that, The groove surface and the protruding surface are interlocking hemispherical or semi-ellipsoidal arc surfaces.

8. The battery venting structure according to any one of claims 1-6, characterized in that, The insulating film and the base plate are thermally bonded together.

9. A battery, said battery comprising a casing, a base plate, an insulating film, and a battery cell, characterized in that, The battery adopts the battery air-proof structure according to any one of claims 1-8.

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