Integrated anti-explosion valve power cover plate with high stability

Abstract

The utility model relates to an integrated explosion-proof valve power cover plate with high stability, which comprises a top cover piece and an explosion-proof valve arranged on the top cover piece, the explosion-proof valve and the top cover piece are of an integrated structure, the top cover piece is respectively provided with a groove and a raised line which surround the periphery of the explosion-proof valve, and the raised line is provided with a groove and a raised line which surround the periphery of the explosion-proof valve. The groove is positioned on one surface, far away from a battery cell, of the top cover plate during assembly, the raised line is positioned on one surface, close to the battery cell, of the top cover plate during assembly, and the groove and the raised line are oppositely arranged. The boss and the groove are additionally arranged on the periphery of the explosion-proof valve on the front face and the back face of the top cover piece, the influence of deformation of the cover plate on the explosion value can be reduced, the control range of the nick value of the explosion-proof valve is accurate, and meanwhile the control range can be wider. And the nick value is better controlled in production, so that the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of battery cover plates, and in particular to an integrated explosion-proof valve power cover plate with high stability. Background Art

[0002] During the use of power batteries, various reasons may cause internal short circuits in the battery. Internal short circuits in the battery will generate a large amount of gas in a short period of time. If the internal gas of the battery is not discharged in time, it will cause explosion and other hidden dangers. Therefore, the battery needs to confirm the explosion value during production. In the existing structure, the explosion of the battery cell is caused by the deformation of the top cover bulge, which tears the notch of the top cover sheet explosion-proof valve and leaks. Since the deformation of different top cover sheets can be very different, the explosion value of the battery cell will be very different, especially for different batches of raw materials. The extreme difference in notch thickness also needs to be reduced. During the production process, the thickness of the notch will also be different in the cold machine state and the hot machine state, which requires the production equipment to have a higher precision. In the subsequent welding process of the top cover and the battery cell shell, the notch of the explosion-proof valve is easily affected by the welding pulling force of the laser welding, resulting in the risk of tearing or tearing the notch of the top cover, which makes the explosion value of the battery cell have a large difference and the risk of leakage, resulting in an increase in the defective rate of the battery cell product. Utility Model Content

[0003] In view of this, the utility model provides an integrated explosion-proof valve power cover with high stability.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A highly stable integrated explosion-proof valve power cover, comprising a top cover sheet, and an explosion-proof valve arranged on the top cover sheet, wherein the explosion-proof valve and the top cover sheet are an integrated structure, and the top cover sheet is respectively provided with a groove and a convex strip surrounding the outer periphery of the explosion-proof valve, the groove is located on a side of the top cover sheet away from a battery cell during assembly, and the convex strip is located on a side of the top cover sheet close to the battery cell during assembly, and the groove and the convex strip are arranged opposite to each other.

[0006] In the above technical solution, the explosion-proof valve and the top cover sheet are an integrated structure with higher stability, and by adding a circle of bosses and grooves on the periphery of the explosion-proof valve on the front and back sides of the top cover sheet, when the cover plate is welded to the shell, the pulling force of the welding on the explosion-proof valve can be absorbed, which plays a double buffering role, reduces the risk of notching and tearing of the explosion-proof valve, makes the cover plate more stable, and can effectively reduce the influence of the deformation of the cover plate on the burst value. And because the influence of the deformation of the cover plate on the burst value becomes smaller, the control range of the notch value of the explosion-proof valve is also more accurate, and the control range can also be wider, so that the production can better control the notch value, thereby improving production efficiency.

[0007] Optionally, in a possible implementation, the explosion-proof valve includes a valve ring and a bursting disc, the outer edge of the valve ring is integrally connected to the top cover plate, the edge of the bursting disc is connected to the valve ring via a connecting ring, and the connecting ring is provided with a notch.

[0008] In the above technical solution, the integrated connection between the valve ring and the top cover plate and the connection between the bursting disc and the valve ring through the connecting ring make the structure of the entire explosion-proof valve more stable and reliable, and when it is monitored that the pressure or temperature inside the battery exceeds the set value, the bursting disc can rupture from the notch to release the pressure, thereby reducing the pressure inside the battery, avoiding explosions, and improving the safety of battery use.

[0009] Optionally, in a possible implementation manner, the thickness of the connecting ring is smaller than the thickness of the valve ring and the thickness of the bursting disc.

[0010] In the above technical solution, the thickness of the connecting ring is smaller than the thickness of the valve ring and the bursting disc, which makes the entire explosion-proof valve lighter. In addition, it can also facilitate the internal air pressure of the battery to tear the notch smoothly when it explodes, ensuring that the explosion-proof valve can effectively release pressure, thereby improving the pressure relief protection of the battery and improving safety in use.

[0011] Optionally, in a possible implementation manner, the valve ring is recessed toward a side of the top cover sheet that is close to the battery cell during assembly.

[0012] In the above technical solution, the concave valve ring can better install the explosion-proof valve on the top cover sheet, improve the flatness of the upper surface of the top cover sheet, and at the same time can effectively increase the surface area of ​​the explosion-proof valve, making it more stable.

[0013] Optionally, in a possible implementation manner, a convex ring is provided on the top cover sheet, the convex ring is located on a side of the top cover sheet away from the battery cell during assembly, and the convex ring is arranged around the outer circumference of the explosion-proof valve.

[0014] In the above technical solution, when the battery is produced and processed, a patch is usually placed on the explosion-proof valve to protect the explosion-proof valve. By providing a convex ring on the top cover sheet, a groove is formed at the position where the explosion-proof valve is installed on the top cover sheet. The patch can be directly placed in the groove, which can facilitate the positioning and installation of the patch. At the same time, it can also prevent the patch from falling off to a certain extent, thereby improving its stability.

[0015] Optionally, in a possible implementation manner, the width of the groove is greater than the width of the convex strip.

[0016] In the above technical solution, the groove and the convex strip act synchronously and together serve as a buffer zone to play a double buffering role, which can better absorb the pulling force of the welded top explosion-proof plate. The width of the groove is greater than the width of the convex strip, which can make the thickness of the buffer zone uneven, avoid sudden breakage, and ensure that the buffer zone can effectively exert its buffering effect.

[0017] Optionally, in a possible implementation manner, the grooves and the convex strips have the same shape, which are circular, elliptical, square or racetrack-shaped.

[0018] In the above technical solution, grooves and convex strips of various shapes can adapt to different battery covers, so that they can be flexibly set for different batteries, which can effectively improve their applicability.

[0019] Optionally, in a possible implementation manner, a distance between an outer edge of the explosion-proof valve and an inner edge of the groove is 4-8 mm.

[0020] In the above technical solution, a sufficient distance should be left between the outer edge of the explosion-proof valve and the inner edge of the groove, which can better play its buffering role on the one hand and facilitate the processing of the groove on the other hand.

[0021] Optionally, in a possible implementation, a fool-proof mark is provided on a side of the top cover sheet away from the battery cell during assembly, and the fool-proof mark includes a first mark and a second mark, and the first mark and the second mark are respectively close to opposite sides of the top cover sheet.

[0022] In the above technical solution, the anti-fool mark is set to facilitate the installation of the cover, because the installation of the cover usually has directional requirements, that is, to ensure that the positions of the positive and negative poles can correspond correctly. Therefore, by designing an anti-fool mark, the error rate of installation can be reduced, thereby improving the yield rate of the battery.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The utility model has a high stability integrated explosion-proof valve power cover. When the air pressure inside the battery core increases, the cover will bend and deform from the back to the front, causing the explosion-proof valve to deform and bend to produce cracks, thereby causing the battery core to explode. By adding a circle of bosses and grooves on the front and back sides of the top cover sheet around the explosion-proof valve, the influence of the cover deformation on the explosion value can be reduced. Since the influence of the cover deformation on the explosion value is reduced, the control range of the explosion-proof valve notch value is more accurate, and the control range can also be wider. This allows production to better control the notch value, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a cross-sectional view of the overall structure of an embodiment of the utility model.

[0027] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0028] Figure 3 This is one of the overall structural schematic diagrams of an embodiment of the utility model.

[0029] Figure 4 This is the second schematic diagram of the overall structure of an embodiment of the utility model.

[0030] Figure markings: 1-top cover plate; 11-groove; 12-convex strip; 13-convex ring; 2-explosion-proof valve; 21-valve ring; 22-bursting disc; 23-connecting ring; 231-notch; 3-anti-fool mark; 31-first mark; 32-second mark. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0033] Please refer to Figure 1-Figure 4 The present embodiment provides an integrated explosion-proof valve power cover with high stability, including a top cover sheet 1, and an explosion-proof valve 2 arranged on the top cover sheet 1. The explosion-proof valve 2 and the top cover sheet 1 are an integrated structure. The top cover sheet 1 is respectively provided with a groove 11 and a convex strip 12 surrounding the outer periphery of the explosion-proof valve 2. The groove 11 is located on a side of the top cover sheet 1 away from the battery cell during assembly, and the convex strip 12 is located on a side of the top cover sheet 1 close to the battery cell during assembly. The groove 11 and the convex strip 12 are arranged opposite to each other.

[0034] The explosion-proof valve 2 and the top cover sheet 1 of this embodiment are an integrated structure with higher stability. When the internal air pressure of the battery cell increases, the cover plate will form a bending deformation that bulges from the back to the front, causing the deformation and bending of the notch 231 of the explosion-proof valve 2 to produce cracks, thereby causing the battery cell to explode. Since the deformation degrees of different cover plates will be greatly different under the same air pressure, the explosion value will be relatively different. By adding a circle of bosses and grooves 11 on the periphery of the explosion-proof valve 2 on the front and back sides of the top cover sheet 1, when the cover plate is welded to the shell, the pulling force of the welding on the explosion-proof valve 2 can be absorbed, which plays a double buffering role, reduces the risk of tearing the notch 231 of the explosion-proof valve 2, makes the cover plate more stable, and can effectively reduce the influence of the deformation of the cover plate on the explosion value. And because the influence of the deformation of the cover plate on the explosion value is reduced, the control range of the notch 231 value of the explosion-proof valve 2 is also more accurate, and the control range can also be wider, so that the production can better control the notch 231 value, thereby improving production efficiency.

[0035] In a possible implementation, the explosion-proof valve 2 includes a valve ring 21 and a bursting disc 22 , the outer edge of the valve ring 21 is integrally connected to the top cover sheet 1 , the edge of the bursting disc 22 is connected to the valve ring 21 via a connecting ring 23 , and a notch 231 is provided on the connecting ring 23 .

[0036] The integral connection between the valve ring 21 and the top cover sheet 1 and the connection between the bursting disc 22 and the valve ring 21 via the connecting ring 23 in this embodiment make the structure of the entire explosion-proof valve 2 more stable and reliable. When it is monitored that the pressure or temperature inside the battery exceeds the set value, the bursting disc 22 can rupture from the notch 231 to release the pressure, thereby reducing the pressure inside the battery, avoiding explosion, and improving the safety of the battery.

[0037] In a possible implementation, the thickness of the connecting ring 23 is less than the thickness of the valve ring 21 and the thickness of the bursting disc 22. The thickness of the connecting ring 23 is less than the thickness of the valve ring 21 and the bursting disc 22, so that the entire explosion-proof valve 2 is lighter and more convenient to control the value of the notch 231. In addition, it is also convenient for the internal air pressure of the battery to smoothly tear the notch 231 when it explodes, ensuring that the explosion-proof valve 2 can effectively release pressure, thereby improving the pressure relief guarantee of the battery and improving the safety of use.

[0038] In a possible implementation, the valve ring 21 is recessed toward the side of the top cover sheet 1 that is close to the battery cell during assembly. The recessed valve ring 21 can better install the explosion-proof valve 2 on the top cover sheet 1, improve the flatness of the upper surface of the top cover sheet 1, and effectively increase the surface area of ​​the explosion-proof valve 2, with greater tensile resistance, so that it has stronger stability.

[0039] In a possible implementation, a convex ring 13 is provided on the top cover sheet 1 . The convex ring 13 is located on a side of the top cover sheet 1 away from the battery cell during assembly. The convex ring 13 is arranged around the outer periphery of the explosion-proof valve 2 .

[0040] During the production and processing of the battery, a patch is usually placed on the explosion-proof valve 2 to protect the explosion-proof valve 2. By providing a convex ring 13 on the top cover sheet 1, a groove is formed at the position where the explosion-proof valve 2 is installed on the top cover sheet 1. The patch can be directly placed in the groove, which can facilitate the positioning and installation of the patch. At the same time, it can also prevent the patch from falling off to a certain extent, thereby improving its stability.

[0041] In a possible implementation, the width of the groove 11 is greater than the width of the convex strip 12. The groove 11 and the convex strip 12 act synchronously and together as a buffer zone to play a double buffering role, which can better absorb the pulling force of the welded top bursting disc 22, and the width of the groove 11 is greater than the width of the convex strip 12, which can make the thickness of the buffer zone uneven, avoid sudden breakage, and ensure that the buffer zone can effectively play its buffering effect.

[0042] In a possible implementation, the groove 11 and the ridge 12 have the same shape, which is round, oval, square or track-shaped. A variety of grooves 11 and ridges 12 of different shapes can adapt to different battery covers, so that they can be flexibly set for different batteries, which can effectively improve its applicability.

[0043] In a possible implementation, the distance between the outer edge of the explosion-proof valve 2 and the inner edge of the groove 11 is 4-8 mm. A sufficient distance should be left between the outer edge of the explosion-proof valve 2 and the inner edge of the groove 11, which can better play its buffering role and facilitate the processing of the groove 11.

[0044] In a possible implementation, a foolproof mark 3 is provided on the side of the top cover sheet 1 away from the battery cell during assembly. The foolproof mark 3 includes a first mark 31 and a second mark 32. The first mark 31 and the second mark 32 are respectively close to the opposite sides of the top cover sheet 1. The foolproof mark 3 is provided to facilitate the installation of the cover plate. Since the installation of the cover plate usually has a direction requirement, that is, to ensure that the positions of the positive and negative poles can correspond correctly, the error rate of installation can be reduced by designing the foolproof mark 3, thereby improving the yield rate of the battery. Specifically, the first mark 31 of this embodiment can be in the shape of "+", used as a positive pole mark, and the second mark 32 can be in the shape of "-", used as a negative pole mark.

[0045] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the application product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated explosion-proof valve power cover with high stability, characterized in that: It includes a top cover sheet, and an explosion-proof valve arranged on the top cover sheet, the explosion-proof valve and the top cover sheet are an integrated structure, the top cover sheet is respectively provided with a groove and a convex strip surrounding the outer circumference of the explosion-proof valve, the groove is located on the side of the top cover sheet away from the battery cell during assembly, the convex strip is located on the side of the top cover sheet close to the battery cell during assembly, and the groove and the convex strip are arranged opposite to each other.

2. The integrated explosion-proof valve power cover with high stability according to claim 1 is characterized in that: The explosion-proof valve comprises a valve ring and a bursting disc, the outer edge of the valve ring is integrally connected to the top cover plate, the edge of the bursting disc is connected to the valve ring via a connecting ring, and the connecting ring is provided with notches.

3. The integrated explosion-proof valve power cover with high stability according to claim 2 is characterized in that: The thickness of the connecting ring is smaller than the thickness of the valve ring and the thickness of the bursting disc.

4. The integrated explosion-proof valve power cover with high stability according to claim 2 is characterized in that: The valve ring is recessed toward a side of the top cover sheet that is close to the battery core during assembly.

5. The integrated explosion-proof valve power cover with high stability according to claim 1 is characterized in that: The top cover sheet is provided with a convex ring, the convex ring is located on a side of the top cover sheet away from the battery core during assembly, and the convex ring is arranged around the outer periphery of the explosion-proof valve.

6. The integrated explosion-proof valve power cover with high stability according to claim 1 is characterized in that: The width of the groove is greater than the width of the convex strip.

7. The integrated explosion-proof valve power cover with high stability according to claim 1 is characterized in that: The grooves and convex strips have the same shape, which are circular, elliptical, square or racetrack.

8. The integrated explosion-proof valve power cover with high stability according to claim 1 is characterized in that: The distance between the outer edge of the explosion-proof valve and the inner edge of the groove is 4-8 mm.

9. The integrated explosion-proof valve power cover with high stability according to claim 1 is characterized in that: The top cover sheet is provided with a fool-proof mark on a side away from the battery cell during assembly. The fool-proof mark includes a first mark and a second mark. The first mark and the second mark are respectively close to two opposite sides of the top cover sheet.

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