A reliable explosion-proof battery cap

Abstract

The utility model discloses an explosion -proof battery cap, top, explosion -proof sheet, insulating washer contain in the containing cavity of sealing ring, and the explosion -proof sheet includes base, recess part and overturning part, and the recess part is provided with annular insulating pad between the base plate, and the outside of annular insulating pad is attached recess part inner side wall, and the inside of annular insulating pad extends to near the fracture notch position, and the conductive hole plate is connected with overturning part, and the insulating washer is wrapped up with the conductive hole plate edge and forms modularization through the first annular part, the second annular part, straight edge part. The utility model discloses the setting of annular insulating pad, guarantees the top boss height insufficient condition, and the fracture notch can still break quickly when the pressure reaches the explosion -proof value, and the overturning part fully overturns the pressure relief explosion -proof, and even if the conductive hole plate is disconnected with the overturning part and falls into the electric core, since the wrapping of insulating washer avoids the risk of short circuit fire, guarantees the reliable realization of explosion -proof function.

Description

Technical Field

[0001] This invention relates to the field of battery cap technology, and more particularly to a reliable explosion-proof battery cap. Background Technology

[0002] With the rapid development of electronic products towards thinner and smaller designs, ultra-thin design has become an inevitable trend for batteries, which are their core energy supply components. To accommodate the overall structure of ultra-thin batteries, the battery cap also needs to be designed to be thinner. In conventional battery cap designs, the top cover typically has a frustum structure. In the context of ultra-thin battery cap design, the space is extremely compressed. When the internal pressure of the battery increases sharply due to abnormal conditions such as overcharging, over-discharging, or short circuits, the explosion-proof sheet needs to break and flip quickly to release the internal high-pressure gas and prevent the battery from exploding. However, due to the space constraints imposed by the thin design, the explosion-proof sheet is limited in height by the tilted side of the frustum of the top cover during the flipping process. This limitation prevents the explosion-proof sheet from breaking and flipping in time, resulting in the inability to fully open the gas release channel, thus affecting the reliability and effectiveness of the explosion-proof function. Moreover, the instantaneous impact force generated by the breakage and flipping of the explosion-proof sheet within the compact space of the thin cap necessitates further ensuring the connection strength between components to avoid secondary safety accidents caused by the impact force. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a reliable explosion-proof battery cap, which aims to improve the safety performance of the battery, especially in terms of reliability in terms of explosion-proof scratch crack prevention and explosion-proof flipping prevention.

[0004] The objective of this utility model is achieved through the following technical solution: A reliable explosion-proof battery cap includes a sealing ring, a top cover, an explosion-proof sheet, an insulating gasket, and a conductive perforated plate. The sealing ring has a receiving cavity, and the top cover, explosion-proof sheet, and insulating gasket are housed within the receiving cavity. The top cover is disposed on the explosion-proof sheet, and the explosion-proof sheet is disposed on the insulating gasket. The top cover includes a base plate with an upwardly protruding boss. The explosion-proof sheet includes a base, a groove, and a flip-up portion. The base surrounds the periphery of the base plate, the sidewall of the groove is connected to the base, and the bottom of the groove is connected to the flip-up portion. A break is provided between the groove and the flip-up portion. The groove is marked with a crack. An annular insulating pad is provided between the groove and the substrate. The outer side of the annular insulating pad is in close contact with the inner sidewall of the groove. The inner side of the annular insulating pad extends to the position near the crack. The conductive hole plate is connected to the flipping part. The insulating washer is provided with a first annular part, a second annular part, and a straight edge part. The right side of the first annular part is in close contact with the outer sidewall of the groove. The lower side of the first annular part and the upper side of the second annular part are both in contact with the edge of the conductive hole plate. The straight edge part connects the first annular part and the second annular part.

[0005] In a preferred embodiment, the height of the annular insulating pad is the same as the height of the sidewall of the groove.

[0006] In a preferred embodiment, the sealing ring, top cover, explosion-proof sheet, insulating gasket, conductive perforated plate, and annular insulating pad have the same axis.

[0007] In a preferred embodiment, the base is attached to the bottom surface of the substrate and bent and extended to wrap around the outer side surface of the substrate and the edge of the top surface of the substrate.

[0008] In a preferred embodiment, the connection between the sidewall of the boss and the substrate is provided with an arc-shaped chamfer.

[0009] In a preferred embodiment, the sidewall of the boss is provided with multiple pressure relief holes.

[0010] In a preferred embodiment, a positioning groove is provided inside the cavity, and the conductive perforated plate is disposed on the positioning groove and tightly fitted to the inner wall of the positioning groove.

[0011] In a preferred embodiment, the conductive perforated plate is provided with a plurality of through holes, which are arranged circumferentially.

[0012] The beneficial effects of this utility model are: 1. The battery cap of this utility model uses an annular insulating pad to fill the space between the explosion-proof disc groove and the substrate, extending to near the fracture mark. When the internal pressure of the battery increases, it reduces the deformation of the explosion-proof disc groove to the fracture mark along the inner wall of the boss, reducing energy consumption and ensuring that the fracture mark breaks quickly when the pressure reaches the explosion-proof value. The flipping part fully flips over, releasing high-pressure gas in time to prevent explosion. Furthermore, the height of the annular insulating pad is consistent with the height of the groove sidewall, forming a stable support constraint on the explosion-proof disc groove, reducing unnecessary deformation when the pressure rises, and allowing the pressure to be concentrated on the fracture mark, ensuring that the fracture mark breaks quickly and accurately, and guaranteeing the reliable realization of the explosion-proof function.

[0013] 2. This utility model enhances the connection strength of each component through the connection and coordination between the various components, such as the wrapping of the explosion-proof sheet base on the top cover substrate, and the joint fixation of the explosion-proof sheet by the insulating gasket and the annular insulating pad, thereby ensuring the structural stability of the cap during battery assembly and battery use. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a top view of the battery cap of this utility model; Figure 2 for Figure 1 A cross-sectional view of the JJ; Figure 3 This is an exploded view of the battery cap of this utility model; Figure 4 This is an enlarged view of the insulating gasket and conductive perforated plate of the battery cap of this utility model; Figure 5 This is a schematic diagram of the battery cap of this utility model assembled on the battery. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0017] It should be noted that when one 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 present. The terms "upper," "lower," "inner," "outer," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0018] See Figures 1 to 3 A reliable explosion-proof battery cap includes a sealing ring 10, a top cover 20, an explosion-proof sheet 30, an insulating gasket 40, and a conductive perforated plate 50. The sealing ring 10 has a receiving cavity, in which the top cover 20, the explosion-proof sheet 30, and the insulating gasket 40 are housed. The top cover 20 includes a base plate 21, on which an upwardly protruding boss 22 is provided. The explosion-proof sheet 30 includes a base 31, a groove 32, and a flip-up portion 33. The base 31 surrounds the periphery of the base plate 21. The sidewall of the groove 32 is connected to the base 21, and the bottom of the groove 32 is connected to the flip-up portion 33. A fracture groove 34 is provided between the groove 32 and the flip-up portion 33. An annular insulating pad 60 is provided between the substrate 21 and the substrate 21. The outer side of the annular insulating pad 60 is in close contact with the inner sidewall of the groove 32. The inner side of the annular insulating pad 60 extends to the position near the fracture mark 34. The conductive hole plate 50 is connected to the flipping part 33. The insulating washer 40 is provided with a first annular part 41, a second annular part 42, and a straight edge part 43. The right side of the first annular part 41 is in close contact with the outer sidewall of the groove 32. The lower side of the first annular part 41 and the upper side of the second annular part 42 are both in contact with the edge of the conductive hole plate 50. The straight edge part 43 connects the first annular part 41 and the second annular part 42.

[0019] It should be noted that, for reference Figure 5 In this embodiment, during battery assembly, the cap is connected to the battery cell 70 and assembled within the steel shell 80. The conductive perforated plate 50 is connected to the battery cell tab 71. Its explosion-proof working principle is as follows: When the internal pressure of the battery is too high, the conductive perforated plate 50 disconnects from the flipping part 33 of the explosion-proof plate 30. The flipping part 33 flips upward, and the annular insulating pad 60 ensures that the explosion-proof plate 30 will also break accurately and promptly at the fracture mark during the flipping process of the flipping part 33, quickly releasing pressure and achieving explosion-proof. This avoids the situation where the flipping part 33 cannot be flipped and disconnected smoothly due to the limited height design of the top cover. Since the insulating gasket 40 wraps around the conductive perforated plate 50 to form a whole, even if the conductive perforated plate 50 falls off after disconnecting from the flipping part 33, it will fall downward into the battery as a whole with the insulating gasket 40. This prevents the conductive perforated plate 50 from falling into the battery alone and contacting the steel shell 80, which could lead to a short circuit and fire, further improving the explosion-proof reliability.

[0020] Specifically, in this embodiment, the upper part of the insulating washer fits into the outer side wall of the groove. Thus, when the cap is assembled onto the battery for normal use, the insulating washer 40 and the annular insulating pad 60 together provide lateral and axial fixation to the groove of the explosion-proof sheet 30. (See reference...) Figure 2 , Figure 4A semi-closed cavity structure is formed between the first annular portion, the second annular portion, and the straight edge portion of the insulating gasket. The edge of the conductive perforated plate 50 is wrapped in this semi-closed cavity, forming an independent module with the insulating gasket 40. When the internal pressure of the battery is too high, pressure is applied to the flipping part 33. Due to the wrapping and fixing of the conductive perforated plate 50 by the insulating gasket 40, when the pressure reaches a certain level, the connection between the conductive perforated plate 50 and the explosion-proof sheet 30 is broken, and the flipping part 33 flips upward to release pressure. In this way, even if the conductive perforated plate 50 separates and falls off from the explosion-proof sheet 30, the conductive perforated plate 50 will fall into the battery together with the insulating gasket 40, rather than falling into the battery alone. Since the edge of the conductive perforated plate 50 is wrapped by the insulating gasket, it is prevented from falling into the battery alone and contacting the steel shell, which could cause a short circuit and fire. This makes it safer and more reliable. Especially in battery pack applications, the overvoltage failure of one battery in the battery pack will not cause a fire, and thus will not cause other batteries to catch fire and cause the entire battery pack to explode. During the cap assembly process, the conductive perforated plate 50 is first welded to the flipped portion 33 of the explosion-proof sheet 30. The first annular portion 41 of the insulating washer 40 is attached to the upper edge of the conductive perforated plate 50. Then, the equipment is used to bend the insulating washer 40 along the outer side of the edge of the conductive perforated plate 50 towards the lower side of the edge of the conductive perforated plate 50, forming a straight edge portion 43 and a second annular portion 42. As the core component of the explosion-proof sheet, when the internal pressure of the battery rises sharply due to overcharging, short circuit, or other reasons, once the pressure reaches the preset explosion-proof pressure value, the fracture mark 34 needs to be able to break quickly, separating the flipped portion 33 from the groove portion 32, providing a release channel for high-pressure gas, and preventing the battery from exploding. In the traditional design without an annular insulating pad, when the height of the top cover is limited, the portion from the bottom of the groove 32 of the explosion-proof plate 30 to the fracture mark 34 will deform along the inner wall of the boss 22 first, increasing the energy consumption of deformation. If the height of the top cover is not high enough, it is easy for the fracture mark 34 to not break when the internal pressure of the battery reaches the preset explosion-proof pressure value, so the pressure cannot be released quickly and the flipping part 33 cannot be flipped smoothly. To ensure the smooth flipping of the flipping part 33, an annular insulating pad 60 is provided to fill the space between the groove 32 of the explosion-proof sheet 30 and the substrate 21, extending to near the fracture mark 34. This reduces the deformation of the explosion-proof film from the bottom of the groove 32 to the fracture mark 34, thus reducing deformation energy consumption. The pad 60's placement near the fracture mark 34 provides a clamping force during the upward flipping process, ensuring the rapid breakage of the fracture mark 34 when the internal pressure of the battery reaches the required explosion-proof pressure value, guaranteeing safety during battery assembly and use.

[0021] To further ensure the timeliness and reliability of explosion protection, preferably, the height of the annular insulating pad 60 is the same as the height of the side wall of the groove 32. It should be noted that when the battery experiences a rapid increase in internal pressure due to overcharging, short circuits, or other abnormal conditions, the explosion-proof plate 30 needs to break precisely at the preset fracture mark 34 to release high-pressure gas and prevent an explosion. The annular insulating pad 60 fits snugly against the inner side wall of the groove 32 and is at the same height, providing stable support and constraint for the groove 32 of the explosion-proof plate 30. This reduces unnecessary deformation of the explosion-proof plate 30 during pressure increases, ensuring that when the flipping part 33 flips, the force concentrates at the fracture mark 34. When the pressure reaches the preset explosion-proof pressure value, the fracture mark 34 breaks quickly and accurately, ensuring timely separation of the flipping part 33 from the groove 32 and providing an effective release channel for high-pressure gas, thereby guaranteeing the reliable implementation of the explosion-proof function.

[0022] In this embodiment, the sealing ring 10, top cover 20, explosion-proof sheet 30, insulating washer 40, conductive perforated plate 50, and annular insulating pad 60 are aligned along the same axis. It is understood that the coaxial design helps maintain the overall shape stability of the battery cap, and the alignment of the axes of each component makes the assembly process simpler and faster. During assembly, simply assemble the components according to the direction of the axis; no complex adjustments or alignment operations are required, thus improving assembly efficiency, accuracy, and consistency.

[0023] To further ensure the stability of the cap structure and prevent explosion-proof failure, the base 31 of the explosion-proof sheet 30 is attached to the bottom surface of the substrate 21 and bent and extended to wrap around the outer side and top edge of the substrate 21. It should be noted that for ultra-thin batteries, whose structure is relatively thin and light, the requirements for connection strength are higher. The wrapping design of the base 31 around the substrate 21 forms a tightly integrated whole, significantly increasing the contact area and connection strength between them. When the battery is subjected to external impact, vibration, or internal pressure changes, it can effectively resist the relative displacement and loosening between components, ensuring the integrity of the cap structure. This structure, in conjunction with the annular insulating pad 60, ensures that the explosion-proof sheet 30 bears pressure in the correct position, making the explosion-proof action more accurate and reliable, improving the timeliness and effectiveness of explosion-proof, and preventing explosion-proof function failure.

[0024] In some embodiments, the connection between the sidewall of the boss 22 and the substrate 21 is provided with an arc-shaped chamfer. It is understood that when the battery is subjected to an impact load or when explosion-proof pressure is released, the arc-shaped chamfer can change the transmission direction of the impact force, so that the impact force is dispersed and transmitted along the curved surface of the chamfer, reducing the direct impact on the connection part, thereby reducing the risk of damage to the connection part and improving the reliability of the battery cap in the impact environment. On the other hand, the arc-shaped chamfer can make the surface of the connection part smoother and flatter, reduce the obstruction in the current conduction process, reduce the contact resistance, improve the current conduction efficiency, avoid the generation of electric arc, and ensure the stability of the battery's electrical performance.

[0025] To facilitate timely pressure relief, multiple pressure relief holes 22a can be provided on the side wall of the boss 22. It should be noted that when the battery experiences abnormal conditions such as overcharging, short circuits, or internal damage, resulting in a rapid increase in gas pressure that causes the explosion-proof sheet 30 to break and flip, it is necessary to release the internal pressure promptly. However, if the gas is released too quickly, it may generate a strong impact force on a certain part, damaging the internal structure of the battery or causing other safety problems. The multiple pressure relief holes 22a can guide the gas release path, dispersing and stabilizing the release, thus both timely expelling gas and reducing the internal pressure of the battery, and preventing secondary safety hazards caused by excessive instantaneous impact force. Similarly, pressure relief holes can also be provided on the top surface of the boss 22.

[0026] Furthermore, the conductive perforated plate 50 is provided with multiple through holes 51 arranged circumferentially. It should be noted that when the internal pressure of the battery increases sharply, it may cause the battery casing to expand, rupture, or even explode. The through holes 51 allow these gases to escape when the pressure reaches a certain level, preventing the battery casing from rupturing or the electrolyte from leaking due to excessive internal pressure. This avoids short circuits or arcing caused by the electrolyte coming into contact with the external conductive components of the battery. Moreover, the conductive perforated plate 50 is subjected to mechanical stress during battery assembly or use. If the structural strength is insufficient, it is prone to deformation or breakage. The uniformly distributed through holes on the conductive perforated plate 50 can evenly distribute the stress to multiple areas, reducing local stress concentration. Preferably, arc-shaped through holes 51 are used. Compared with other shapes, the smooth transition of the arc-shaped through holes 51 can avoid stress concentration at sharp corners, further reducing the risk of structural damage.

[0027] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A reliable explosion-proof battery cap, comprising a sealing ring, a top cover, an explosion-proof sheet, an insulating washer, and a conductive perforated plate, wherein the sealing ring has a receiving cavity, and the top cover, the explosion-proof sheet, and the insulating washer are housed within the receiving cavity, the top cover being disposed on the explosion-proof sheet, and the explosion-proof sheet being disposed on the insulating washer, characterized in that... The top cover includes a base plate, on which an upwardly protruding boss is provided; The explosion-proof sheet includes a base, a groove, and a flip-over portion. The base wraps around the periphery of the substrate. The sidewall of the groove is connected to the base. The bottom of the groove is connected to the flip-over portion. A fracture mark is provided between the groove and the flip-over portion. An annular insulating pad is provided between the groove and the substrate. The outer side of the annular insulating pad is in close contact with the inner sidewall of the groove. The inner side of the annular insulating pad extends to a position close to the fracture mark. The conductive perforated plate is connected to the flipping part; The insulating washer is provided with a first annular portion, a second annular portion, and a straight edge portion. The right side of the first annular portion is in close contact with the outer side wall of the groove portion. The lower side of the first annular portion and the upper side of the second annular portion are both in contact with the edge of the conductive perforated plate. The straight edge portion connects the first annular portion and the second annular portion.

2. The reliable explosion-proof battery cap according to claim 1, characterized in that, The height of the annular insulating pad is the same as the height of the side wall of the groove.

3. The reliable explosion-proof battery cap according to claim 1, characterized in that, The sealing ring, top cover, explosion-proof sheet, insulating gasket, conductive perforated plate, and annular insulating pad are aligned on the same axis.

4. The reliable explosion-proof battery cap according to claim 1, characterized in that, The base is attached to the bottom surface of the substrate and is bent and extended to wrap around the outer side surface of the substrate and the edge of the top surface of the substrate.

5. The reliable explosion-proof battery cap according to claim 1, characterized in that, The connection between the sidewall of the boss and the substrate is provided with an arc-shaped chamfer.

6. The reliable explosion-proof battery cap according to claim 1, characterized in that, The boss has multiple pressure relief holes on its side wall.

7. The reliable explosion-proof battery cap according to claim 1, characterized in that, A positioning groove is provided inside the cavity, and the conductive perforated plate is disposed on the positioning groove and is tightly fitted to the inner wall of the positioning groove.

8. The reliable explosion-proof battery cap according to claim 1, characterized in that, The conductive perforated plate has multiple through holes arranged circumferentially.

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