Battery cap and battery

Abstract

The utility model relates to the technical field of batteries, discloses a battery cap and a battery, and aims to solve the problems of unstable installation of a pore plate and an anti-explosion valve and poorer insulating property in the prior art. The battery cap comprises a top cover and an anti-explosion valve, wherein the top cover covers the top of the anti-explosion valve; the pore plate is mounted at the bottom of the anti-explosion valve, and at least part of the pore plate is in contact with the bottom of the anti-explosion valve; an insulating part is installed between the pore plate and the anti-explosion valve, a matching clamping groove with an opening facing the pore plate is formed in the insulating part, and the pore plate is arranged in the matching clamping groove in an interference fit mode. According to the battery cap provided by the utility model, the matched clamping groove is formed by utilizing the insulating part, and the pore plate is in interference fit in the matched clamping groove, so that stable connection among the pore plate, the insulating part and the anti-explosion valve is realized, and the insulating property is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cap and a battery. Background Technology

[0002] In related technologies, traditional cylindrical battery designs typically include components such as a top cover, an explosion-proof valve, and an orifice plate. These components need to ensure good electrical connections and mechanical stability, while also possessing certain safety features to prevent the risk of explosion due to excessive internal pressure. To achieve these goals, insulating material is usually placed between the orifice plate and the explosion-proof valve to ensure electrical isolation, and the components are fixed together using methods such as welding.

[0003] However, in some traditional designs, the electrical isolation between the orifice plate and the explosion-proof valve is insufficient, which can easily lead to direct current conduction and increase the risk of short circuits. This not only affects battery safety but may also cause a decline in battery performance. Furthermore, the fixing method between the orifice plate and the explosion-proof valve may not be secure enough. Especially when exposed to vibration or external impact, the orifice plate may shift or even detach, thereby damaging the integrity of the battery's internal structure and affecting the battery's efficiency and lifespan. Utility Model Content

[0004] In view of this, the present invention provides a battery cap and a battery to solve the problems of unstable installation and poor insulation performance of orifice plates and explosion-proof valves in related technologies.

[0005] In a first aspect, this utility model provides a battery cap, comprising:

[0006] A top cover and an explosion-proof valve, wherein the top cover is disposed on top of the explosion-proof valve;

[0007] An orifice plate is installed at the bottom of the explosion-proof valve and at least partially contacts the bottom of the explosion-proof valve;

[0008] An insulating component is installed between the orifice plate and the explosion-proof valve. The insulating component has a mating groove with an opening facing the orifice plate, and the orifice plate is interference-fitted into the mating groove.

[0009] Beneficial effects: (1) Enhanced electrical isolation performance: The insulating component is set between the orifice plate and the explosion-proof valve, forming a mating groove with the opening facing the orifice plate. The above design ensures electrical isolation between the orifice plate and the explosion-proof valve, preventing direct current conduction, thereby effectively avoiding the risk of short circuit and improving the safety and stability of the battery.

[0010] (2) Enhanced mechanical stability: The orifice plate is tightly clamped in the groove of the insulating component by an interference fit. This tight fit ensures that the orifice plate will not easily shift or fall off even when subjected to vibration or external impact, thereby improving the mechanical stability of the entire battery cap structure.

[0011] (3) Optimized assembly process: By using interference fit for assembly, the production process is simplified, and the assembly accuracy and consistency are improved, which helps to reduce errors in the production process, thereby improving product quality and reducing the defect rate.

[0012] In one optional embodiment, the middle portion of the orifice plate contacts and is fixedly connected to the middle portion of the explosion-proof valve; an annular insulating member is installed between the outer peripheral portion of the orifice plate and the outer peripheral portion of the explosion-proof valve, and the insulating member extends along the circumferential direction of the orifice plate.

[0013] Beneficial effects: On the one hand, the orifice plate and the middle part of the explosion-proof valve are firmly connected by laser welding, ensuring electrical continuity and adjustable voltage interruption pressure; while the outer periphery of the orifice plate and the explosion-proof valve are electrically isolated and mechanically supported by annular insulating parts, which improves the stability and safety of the overall structure.

[0014] In one optional embodiment, the insulating member includes a first insulating portion and a second insulating portion, the first insulating portion and the second insulating portion being connected to each other and arranged at an angle;

[0015] The first insulating part is disposed around the outer peripheral wall of the orifice plate, and the second insulating part is sandwiched between the explosion-proof valve and the orifice plate. The inner walls of the first insulating part and the second insulating part together define the mating groove.

[0016] Beneficial effects: This embodiment provides dual protection through the coordinated work of the first and second insulating parts. One layer of protection is electrical isolation, which prevents current from being directly conducted from the orifice plate to the explosion-proof valve or vice versa, thus improving safety. The other layer of protection is mechanical support, which enhances the fixation of the orifice plate and the stability of the overall structure, reducing the risk of loosening caused by vibration or external force.

[0017] Furthermore, by precisely controlling the angle between the first and second insulating parts and the tolerance range of the interference fit, the reliability and durability of the entire battery cap can be effectively improved.

[0018] In one alternative embodiment, an engaging protrusion is formed on the inner wall of the first insulating portion, protruding toward the mating groove, and the outer peripheral wall of the perforated plate abuts against the engaging protrusion and is interference-fitted with it.

[0019] Beneficial effects: The aforementioned engaging protrusions not only increase the contact area between the orifice plate and the insulating component, but also provide additional friction and support. This makes the orifice plate more stable when subjected to external vibration or impact, and less prone to loosening or displacement.

[0020] In one alternative embodiment, the outer peripheral wall of the perforated plate is provided with an inwardly recessed engagement groove, and the clip and protrusion are interference-fitted within the engagement groove.

[0021] Beneficial effects: On the one hand, the interference fit between the engagement protrusion and the engagement groove significantly enhances the fixing effect of the orifice plate in the insulating component; on the other hand, the engagement groove provides a precise positioning point for the orifice plate, making the assembly process more standardized and controllable, and reducing quality problems caused by assembly errors.

[0022] In one optional embodiment, the interference fit between the perforated plate and the engaging protrusion is between 0.05 mm and 0.2 mm.

[0023] Beneficial effects: By precisely controlling the interference fit between 0.05mm and 0.2mm, this embodiment ensures that the weld fixing strength between the orifice plate and the explosion-proof valve is at its optimal state. This not only guarantees that the orifice plate will not deform due to external factors (such as tab tension or insulating ring clamping), but also ensures that in the event of battery runaway, the weld can accurately break according to the preset pressure threshold, achieving safe power disconnection.

[0024] In one optional embodiment, the outer peripheral portion of the explosion-proof valve is stepped, and correspondingly, the second insulating portion is stepped, with the upper surface of the second insulating portion abutting against the lower surface of the outer peripheral portion of the explosion-proof valve.

[0025] Beneficial effects: On the one hand, the stepped design allows for more precise alignment and tighter fit between the explosion-proof valve and the second insulation part, thereby improving the mechanical stability of the entire assembly and reducing the risk of loosening or displacement due to misalignment between components. Simultaneously, the stepped contact surface allows for a more even distribution of pressure from inside the battery, preventing damage caused by localized stress concentration.

[0026] On the other hand, the stepped design helps to achieve better electrical isolation. The different stepped sections of the second insulation part make close contact with the corresponding parts of the explosion-proof valve, ensuring electrical isolation between the orifice plate and the explosion-proof valve and preventing current leakage or short circuits. Furthermore, the stepped design increases electrical clearance, reduces the possibility of arcing, and further enhances battery safety.

[0027] In one optional embodiment, the outer peripheral portion of the explosion-proof valve includes a first outer ring portion and a second outer ring portion, wherein the first outer ring portion is higher than the second outer ring portion and located outside the second outer ring portion;

[0028] The second insulating portion includes a first stepped portion and a second stepped portion, wherein the first stepped portion is higher than the second stepped portion and is located outside the second stepped portion;

[0029] The first stepped portion abuts against the first outer ring portion, and the second stepped portion abuts against the second outer ring portion.

[0030] Beneficial effects: By designing the outer periphery of the explosion-proof valve and the second insulation part as stepped, and precisely controlling the height difference and thickness of each part, not only is the mechanical stability and electrical isolation performance of the entire battery cap improved, but the assembly process is also simplified, ensuring the high reliability and safety of the product.

[0031] In one alternative embodiment, the outer periphery of the explosion-proof valve is bent away from the orifice plate to form a limiting portion. The limiting portion is arranged around the outer periphery of the top cover, and a sealing ring is also arranged around the outer side of the limiting portion. A sealing protrusion is provided on the inner wall of the sealing ring. The sealing protrusion is used to fill and seal the height difference gap between the limiting portion and the outer periphery of the top cover.

[0032] Beneficial effects: This embodiment utilizes the sealing protrusions on the sealing ring to effectively seal the height difference gap, ensuring that the battery can maintain good sealing performance and safety even in the presence of manufacturing errors, thereby overcoming the problem of poor sealing performance of battery caps in related technologies.

[0033] In addition, the design of the annular limiting part allows the top cover to be securely placed on the explosion-proof valve, reducing the risk of displacement caused by vibration or external impact and enhancing the stability of the entire battery cap structure. Furthermore, the height difference gap between the annular limiting part and the top cover is carefully designed to ensure that the sealing protrusion can be perfectly embedded and provide a reliable sealing effect, thereby improving the overall sealing performance.

[0034] Secondly, this utility model also provides a battery, comprising:

[0035] The battery cap as described in the first aspect of the present invention;

[0036] A battery casing and a cell assembly, wherein the cell assembly is installed inside the battery casing and a battery cap is provided on the top opening of the battery casing, wherein the perforated plate is electrically connected to the tabs inside the cell assembly. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a cross-sectional view of the battery cap of this utility model embodiment when it is not assembled onto the battery casing;

[0039] Figure 2 This is a cross-sectional view of the battery cap of this utility model embodiment when it is partially assembled onto the battery casing;

[0040] Figure 3 This is a cross-sectional view of the battery cap of this utility model embodiment when it is fully assembled onto the battery casing;

[0041] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0042] Figure 5 This is a top view of the perforated plate of the battery cap according to an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Top cover; 2. Explosion-proof valve; 21. Second working part; 22. First outer ring part; 23. Second outer ring part; 3. Sealing ring; 31. Sealing protrusion; 4. Structural adhesive; 5. Orifice plate; 51. First working part; 6. Insulating component; 61. First insulating part; 62. Second insulating part; 63. First stepped part; 64. Second stepped part; 65. Engaging protrusion; 7. Battery casing; 8. Battery cell assembly. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0046] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0048] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through 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. "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.

[0049] The present invention provides a battery cap and a battery having the battery cap, as described below with reference to the accompanying drawings.

[0050] like Figures 1 to 5 As shown, the battery cap according to the first aspect of the present invention includes a top cover 1, an explosion-proof valve 2, a perforated plate 5, and an insulating component 6.

[0051] The top cover 1 is placed on top of the explosion-proof valve 2; the orifice plate 5 is installed at the bottom of the explosion-proof valve 2 and at least partially contacts the bottom of the explosion-proof valve 2; an insulating element 6 is installed between the orifice plate 5 and the explosion-proof valve 2, the insulating element 6 forming a mating groove with an opening facing the orifice plate 5, and the orifice plate 5 is interference-fitted in the mating groove.

[0052] The battery cap according to an embodiment of the present utility model has the following specific structure:

[0053] like Figures 1 to 5 As shown, the top cover 1 is part of the battery cap, located at the very top of the entire structure, serving to seal and protect the internal components. The explosion-proof valve 2 is located below the top cover 1, preventing explosions caused by excessive internal battery pressure. The top cover 1 covers the top of the explosion-proof valve 2, ensuring a tight seal to maintain a stable internal battery environment. The perforated plate 5 is installed at the bottom of the explosion-proof valve 2 and at least partially contacts its bottom. The main function of the perforated plate 5 is as a connection point for fixing the tabs (the part connecting the internal battery cells to the external circuitry), and for current transmission through its openings.

[0054] An insulating component 6 is disposed between the orifice plate 5 and the explosion-proof valve 2, forming a mating groove with its opening facing the orifice plate 5. This insulating component 6 not only serves as a physical isolation, preventing current from being directly conducted from the explosion-proof valve 2 to the orifice plate 5 or vice versa, but also provides mechanical support. The orifice plate 5 is installed in the mating groove by an interference fit, ensuring a stable connection between the orifice plate 5 and the explosion-proof valve 2, while avoiding potential safety hazards caused by loosening.

[0055] It should be explained that the interference fit between the orifice plate 5 and the insulating component 6 means that the orifice plate 5 is tightly clamped within the mating groove of the insulating component 6. This design ensures that even when the battery encounters vibration or other external forces during use, the orifice plate 5 will not easily shift or fall off, thereby improving the stability and reliability of the entire battery cap structure.

[0056] Based on the above structural description, the working principle of the battery cap of this utility model is as follows: The insulating component 6 is disposed between the orifice plate 5 and the explosion-proof valve 2, forming a mating groove with its opening facing the orifice plate 5. The orifice plate 5 is securely clamped in the groove through an interference fit. This design not only achieves electrical isolation between the orifice plate 5 and the explosion-proof valve 2, preventing direct current conduction, but also provides necessary mechanical support to ensure that the orifice plate 5 will not shift or fall off due to vibration or external force during battery use, thereby ensuring the stability and safety of the battery cap structure.

[0057] Furthermore, the assembly process of the battery cap of this utility model is roughly as follows: First, ensure that all necessary components (top cover 1, explosion-proof valve 2, perforated plate 5, insulating component 6) and tools (such as laser welding equipment) are prepared, and check whether the quality of each component meets the standards. Then, weld the battery's internal tabs (the part connecting the battery cell to the external circuit) to the perforated plate 5, ensuring a firm weld and good electrical connection. This step is fundamental to ensuring the battery can function properly.

[0058] Next, place the insulating component 6 on the workbench, ensuring its mating slot is correctly oriented. Then, insert the orifice plate 5, with its pre-welded tabs, into the mating slot of the insulating component 6, using an interference fit to ensure the orifice plate 5 fits tightly against the insulating component 6. Ensure the orifice plate 5 is not loose or tilted. Afterward, carefully place the assembly with the insulating component 6 and orifice plate 5 below the explosion-proof valve 2, ensuring the orifice plate 5 is at least partially in contact with the bottom of the explosion-proof valve 2. Adjust the position until the orifice plate 5 is perfectly aligned with the explosion-proof valve 2.

[0059] Finally, place the top cover 1 on top of the explosion-proof valve 2 and weld the top cover 1 to the explosion-proof valve 2 together using laser welding equipment. The welding process should ensure uniform heating to avoid localized overheating that could lead to deformation or other defects. After completing the above steps, the finished product undergoes rigorous quality inspection, including but not limited to visual inspection, dimensional measurement, and electrical performance testing, to ensure that each battery cap meets design requirements.

[0060] In related technologies, traditional cylindrical battery designs typically include components such as a top cover, an explosion-proof valve, and an orifice plate. These components need to ensure good electrical connections and mechanical stability, while also possessing certain safety features to prevent the risk of explosion due to excessive internal pressure. To achieve these goals, insulating material is usually placed between the orifice plate and the explosion-proof valve to ensure electrical isolation, and the components are fixed together using methods such as welding.

[0061] However, in some traditional designs, the electrical isolation between the orifice plate and the explosion-proof valve is insufficient, which can easily lead to direct current conduction and increase the risk of short circuits. This not only affects battery safety but may also cause a decline in battery performance. Furthermore, the fixing method between the orifice plate and the explosion-proof valve may not be secure enough. Especially when exposed to vibration or external impact, the orifice plate may shift or even detach, thereby damaging the integrity of the battery's internal structure and affecting the battery's efficiency and lifespan.

[0062] In summary, in order to solve the technical defects existing in the above-mentioned related technologies, this utility model provides a battery cap, which uses the insulating part 6 to form a matching groove, and makes the perforated plate 5 interference fit in the matching groove, thereby realizing a stable connection between the perforated plate 5, the insulating part 6 and the explosion-proof valve 2, and ensuring the insulation performance.

[0063] Furthermore, the battery cap of this utility model has at least the following advantages compared to related technologies:

[0064] (1) Enhanced electrical isolation performance: The insulating component 6 is disposed between the orifice plate 5 and the explosion-proof valve 2, forming a mating groove with an opening facing the orifice plate 5. The above design ensures electrical isolation between the orifice plate 5 and the explosion-proof valve 2, preventing direct current conduction, thereby effectively avoiding the risk of short circuit and improving the safety and stability of the battery.

[0065] (2) Enhanced mechanical stability: The orifice plate 5 is tightly clamped in the groove of the insulating component 6 by an interference fit. This tight fit ensures that the orifice plate 5 will not easily shift or fall off even when subjected to vibration or external impact, thereby improving the mechanical stability of the entire battery cap structure.

[0066] (3) Optimized assembly process: By using interference fit for assembly, the production process is simplified, and the assembly accuracy and consistency are improved, which helps to reduce errors in the production process, thereby improving product quality and reducing the defect rate.

[0067] According to some embodiments of this utility model, the interference fit between the perforated plate 5 and the mating groove is between 0.05mm and 0.2mm. For example, the interference fit can be 0.05mm, 0.1mm, or 0.2mm, etc.

[0068] It should be noted that if the interference fit is too low or there is no interference fit at all, the orifice plate 5 is easily deformed due to the tensile force after the internal tabs of the battery are welded. Conversely, if the interference fit is too large, the orifice plate 5 is also easily deformed due to the clamping effect of the insulating component 6.

[0069] The following table provides a comparison of the test results of the interference fit between the perforated plate 5 and the mating slot of the battery cap based on this utility model, as shown in Table 1.

[0070] Table 1

[0071] Group Interference / mm Is it deformed? Structural stability Example 1 0.05 no middle Example 2 0.08 no middle Example 3 0.1 no high Example 4 0.15 no high Example 5 0.2 no high Comparative Example 1 0.03 no Low Comparative Example 2 0.3 yes high Comparative Example 3 0.4 yes high

[0072] As can be seen from the table above, when the interference fit between the perforated plate 5 and the mating groove is within the range of 0.05mm to 0.2mm, the perforated plate 5 will not deform, and its structural stability can be guaranteed. However, when the interference fit is less than 0.05mm, although the perforated plate 5 will not deform, its structural stability is low, and the perforated plate 5 is prone to loosening; and when the interference fit is greater than 2mm, the perforated plate 5 will deform under the excessive clamping of the insulating component 6.

[0073] like Figure 1 As shown, according to some embodiments of the present invention, the middle portion of the orifice plate 5 contacts and is fixedly connected to the middle portion of the explosion-proof valve 2. An annular insulating member 6 is installed between the outer peripheral portion of the orifice plate 5 and the outer peripheral portion of the explosion-proof valve 2, and the insulating member 6 extends along the circumferential direction of the orifice plate 5.

[0074] In this way, on the one hand, the middle part of the orifice plate 5 and the explosion-proof valve 2 are firmly connected by laser welding to ensure electrical continuity and adjustable voltage interruption force; on the other hand, the outer periphery of the orifice plate 5 and the explosion-proof valve 2 are electrically isolated and mechanically supported by the annular insulating part 6, which improves the stability and safety of the overall structure.

[0075] For example Figure 1 As shown, the middle part of the orifice plate 5 has a circular, thinned first working part 51, and the middle part of the explosion-proof valve 2 has a circular second working part 21. The first working part 51 and the second working part 21 are connected by laser welding. The first working part 51 and the second working part 21 are used to switch between power off and power on.

[0076] In this embodiment, the specific principle of the explosion-proof valve 2 is as follows: Under normal operating conditions, the first working part 51 of the orifice plate 5 and the second working part 21 of the explosion-proof valve 2 are firmly connected together by laser welding, forming a stable electrical connection path. At this time, current can be smoothly transmitted through the orifice plate 5, the explosion-proof valve 2 and their connection points, ensuring that the battery can supply power normally.

[0077] When the internal pressure of the battery rises to a certain threshold due to excessive gas or heat generation, the weld point between the orifice plate 5 and the explosion-proof valve 2 (i.e., the connection between the first working part 51 and the second working part 21) will break due to the preset weld strength. After the breakage, the second working part 21 of the explosion-proof valve 2 will flip upward under the influence of the internal high pressure, thereby completely disconnecting the electrical connection between the first working part 51 of the orifice plate 5 and the second working part 21 of the explosion-proof valve 2. This disconnection action effectively cuts off the internal circuit of the battery, preventing more serious safety problems such as explosion or rupture caused by excessive internal pressure.

[0078] Thus, through this specially designed first working section 51 and second working section 21, and with precisely controlled laser welding intensity, this invention achieves intelligent monitoring and response to the internal environment of the battery. Once an abnormal high-voltage condition is detected, power can be automatically cut off, significantly improving the safety and reliability of the battery.

[0079] like Figure 1 As shown, according to some embodiments of the present invention, the insulating member 6 includes a first insulating part 61 and a second insulating part 62, the first insulating part 61 and the second insulating part 62 are connected to each other and are arranged at an angle.

[0080] The first insulating part 61 is arranged around the outer peripheral wall of the orifice plate 5, and the second insulating part 62 is sandwiched between the explosion-proof valve 2 and the orifice plate 5. The inner walls of the first insulating part 61 and the second insulating part 62 together define a mating groove.

[0081] In this embodiment, the insulating member 6 is mainly divided into two parts, namely the first insulating part 61 and the second insulating part 62. The first insulating part 61 is arranged around the outer peripheral wall of the orifice plate 5 to form a ring structure. Its main function is to provide additional support for the orifice plate 5 and work together with the second insulating part 62 to ensure the stability of the orifice plate 5 in the entire battery cap. The second insulating part 62 is sandwiched between the explosion-proof valve 2 and the orifice plate 5. Its main function is to provide electrical isolation and enhance mechanical stability. Specifically, the second insulating part 62 is located between the upper surface of the outer peripheral portion of the orifice plate 5 and the lower surface of the outer peripheral portion of the explosion-proof valve 2, ensuring that the two do not come into direct contact, thereby avoiding the risk of short circuit.

[0082] Furthermore, since the first insulating part 61 and the second insulating part 62 are interconnected and arranged at a certain angle, the above design allows the insulating member 6 to not only adapt to orifice plates 5 and explosion-proof valves 2 of different shapes and sizes, but also to better distribute pressure from all directions, improving the stability and durability of the overall structure. The specific angle setting can be adjusted according to actual needs to optimize the function and performance of the insulating member 6. For example, under normal circumstances, the first insulating part 61 is arranged perpendicular to the second insulating part 62.

[0083] The inner walls of the first insulating part 61 and the second insulating part 62 together define a mating groove with an opening facing the orifice plate 5. The mating groove is used to fix the orifice plate 5 inside it by means of an interference fit. The interference fit design ensures that the orifice plate 5 can be firmly installed in the mating groove, and will not loosen or shift even when exposed to vibration or external impact. For example, the interference amount is typically controlled between 0.05-0.2 mm to ensure optimal fixing effect without causing deformation of the orifice plate 5.

[0084] Thus, this embodiment provides dual protection through the coordinated operation of the first insulating part 61 and the second insulating part 62. One layer of protection is electrical isolation, which prevents current from being directly conducted from the orifice plate 5 to the explosion-proof valve 2 or vice versa, thereby improving safety. The other layer of protection is mechanical support, which enhances the fixation of the orifice plate 5 and the stability of the overall structure, reducing the risk of loosening caused by vibration or external force.

[0085] Furthermore, by precisely controlling the angle between the first insulating part 61 and the second insulating part 62, as well as the tolerance range of the interference fit, the reliability and durability of the entire battery cap can be effectively improved.

[0086] like Figure 1 As shown, according to some embodiments of the present invention, a locking protrusion 65 protruding toward the mating groove is formed on the inner wall of the first insulating part 61, and the outer peripheral wall of the perforated plate 5 abuts against the locking protrusion 65 and is interference-fitted with it.

[0087] It is understandable that the aforementioned engaging protrusion 65 not only increases the contact area between the orifice plate 5 and the insulating component 6, but also provides additional friction and support. This makes the orifice plate 5 more stable when subjected to external vibration or impact, and less prone to loosening or displacement.

[0088] Furthermore, the upper surface of the orifice plate 5 is spaced apart from the lower surface of the second insulating part 62. The orifice plate 5 is fixed by interference fit between itself and the locking protrusion 65. It can be understood that the presence of the locking protrusion 65 enables the orifice plate 5 to be spaced apart from the second insulating part 62, and further improves the insulation performance between the outer periphery of the orifice plate 5 and the outer periphery of the explosion-proof valve 2.

[0089] In this embodiment, on the one hand, by ensuring a gap between the upper surface of the orifice plate 5 and the lower surface of the second insulating part 62, direct contact between the two is avoided, thereby greatly improving the electrical isolation effect between the outer periphery of the orifice plate 5 and the outer periphery of the explosion-proof valve 2, effectively preventing current leakage or short circuits. On the other hand, the presence of the engaging protrusion 65 not only provides mechanical support but also creates the necessary electrical isolation distance between the orifice plate 5 and the second insulating part 62, thereby helping to optimize the electrical insulation path and further enhancing the insulation performance of the entire battery cap structure.

[0090] It should be noted that although there is a gap between the perforated plate 5 and the second insulating part 62, the interference fit achieved by the engaging protrusion 65 still firmly fixes the perforated plate 5. This design ensures the mechanical stability of the perforated plate 5 without compromising its insulation performance due to tight contact. Furthermore, the gap reduces the possibility of friction between the perforated plate 5 and the second insulating part 62 caused by vibration or impact, thereby reducing the risk of wear and extending the service life of the battery cap.

[0091] Furthermore, the outer peripheral wall of the perforated plate 5 is provided with an inwardly recessed engagement groove, and the locking and protrusions are interference-fitted in the engagement groove.

[0092] In this embodiment, the engaging protrusion 65 on the inner wall of the first insulating part 61 is embedded into the engaging groove on the outer peripheral wall of the perforated plate 5 by an interference fit. The above-mentioned groove and protrusion matching structure design not only increases the contact area, but also provides stronger mechanical fixing force.

[0093] Understandably, on the one hand, the interference fit between the engaging protrusion 65 and the engaging groove significantly enhances the fixing effect of the orifice plate 5 in the insulating component 6; on the other hand, the engaging groove provides a precise positioning point for the orifice plate 5, making the assembly process more standardized and controllable, and reducing quality problems caused by assembly errors.

[0094] Furthermore, the presence of the locking groove allows the orifice plate 5 to be more easily inserted into the mating groove of the insulating component 6, and automatic alignment and fixation are achieved through the locking protrusion 65, simplifying the assembly process and improving production efficiency. At the same time, if repair or replacement of parts is required, the design of the locking groove and locking protrusion 65 facilitates disassembly and reinstallation, improving maintenance convenience.

[0095] Furthermore, the interference fit between the perforated plate 5 and the engaging protrusion 65 is between 0.05mm and 0.2mm. For example, the interference fit can be 0.05mm, 0.1mm, or 0.2mm.

[0096] It should be noted that if the interference fit is too low or there is no interference fit at all, the orifice plate 5 is easily deformed by the tensile force after the internal tabs of the battery are welded. The tensile force applied by the tabs to the orifice plate 5 may cause the orifice plate 5 to shift in position, thereby affecting the welding fixation strength between it and the explosion-proof valve 2, and consequently affecting the battery's voltage-off pressure setting.

[0097] Conversely, if the interference fit is too large, the orifice plate 5 is also prone to deformation due to the clamping effect of the insulating component 6. This deformation will affect the welding fixation strength between the orifice plate 5 and the explosion-proof valve 2, and may change the preset voltage cutoff pressure threshold, making it impossible for the battery to cut off power in the expected way when it runs out of control.

[0098] It is understood that by precisely controlling the interference fit between 0.05mm and 0.2mm, this embodiment can ensure that the welding fixation strength between the orifice plate 5 and the explosion-proof valve 2 is in the optimal state. This not only ensures that the orifice plate 5 will not deform due to external factors (such as tab tension or insulating ring clamping), but also ensures that in the event of battery runaway, the weld can accurately break according to the preset pressure threshold, achieving safe power disconnection.

[0099] like Figure 4 As shown, according to some embodiments of the present invention, the outer peripheral portion of the explosion-proof valve 2 is arranged in a stepped shape, and correspondingly, the second insulating portion 62 is arranged in a stepped shape, with the upper surface of the second insulating portion 62 abutting against the lower surface of the outer peripheral portion of the explosion-proof valve 2.

[0100] In this way, on the one hand, the stepped design allows the explosion-proof valve 2 and the second insulation part 62 to be more precisely aligned and tightly fitted, thereby improving the mechanical stability of the entire assembly and reducing the risk of loosening or displacement caused by misalignment between components. At the same time, the stepped contact surface can distribute the pressure from inside the battery more evenly, avoiding damage caused by local stress concentration.

[0101] On the other hand, the stepped design helps to achieve better electrical isolation. The different stepped sections of the second insulation part 62 are in close contact with the corresponding sections of the explosion-proof valve 2, ensuring electrical isolation between the orifice plate 5 and the explosion-proof valve 2 and preventing current leakage or short circuits. Furthermore, the stepped design can increase electrical clearance, reduce the possibility of arcing, and further improve battery safety.

[0102] like Figure 4 As shown, the outer peripheral portion of the explosion-proof valve 2 further includes a first outer ring portion 22 and a second outer ring portion 23, wherein the first outer ring portion 22 is higher than the second outer ring portion 23 and is located outside the second outer ring portion 23. The second insulating portion 62 includes a first stepped portion 63 and a second stepped portion 64, wherein the first stepped portion 63 is higher than the second stepped portion 64 and is located outside the second stepped portion 64.

[0103] The first step 63 abuts against the first outer ring 22, and the second step 64 abuts against the second outer ring 23.

[0104] In this embodiment, the first outer ring portion 22 is located at the outermost edge of the outer periphery of the explosion-proof valve 2 and has a relatively high height. This portion mainly serves to provide support and positioning. The second outer ring portion 23 is located inside the first outer ring portion 22 and has a relatively low height. This portion contacts the second stepped portion 64 of the first insulating portion 61, ensuring electrical isolation and providing additional mechanical support.

[0105] The first stepped portion 63 is located outside the second insulating portion 62 and is relatively high. This portion directly abuts against the first outer ring portion 22 of the explosion-proof valve 2 and connects to the first insulating portion 61, ensuring tight contact and mechanical stability. The second stepped portion 64 is located inside the second insulating portion 62 and is relatively low. This portion abuts against the second outer ring portion 23 of the explosion-proof valve 2, further enhancing the overall structural stability and electrical isolation effect.

[0106] The aforementioned stepped design structure also simplifies the assembly process. Specifically, during assembly, the orifice plate 5 is first placed in the mating groove of the first insulating part 61, ensuring that the engaging protrusion 65 is correctly embedded in the engaging groove of the orifice plate 5. Then, the first stepped part 63 and the second stepped part 64 of the second insulating part 62 are aligned with the first outer ring part 22 and the second outer ring part 23 of the explosion-proof valve 2, respectively, and gently pressed to achieve tight contact.

[0107] In this way, by designing the outer periphery of the explosion-proof valve 2 and the second insulation part 62 as stepped, and precisely controlling the height difference and thickness of each part, not only is the mechanical stability and electrical isolation performance of the entire battery cap improved, but the assembly process is also simplified, ensuring the high reliability and safety of the product.

[0108] For example, the height difference between the first outer ring portion 22 and the second outer ring portion 23 of the explosion-proof valve 2 is 0.5mm (which can be adjusted according to actual needs) to ensure that the first stepped portion 63 and the second stepped portion 64 of the second insulating portion 62 can be accurately aligned and tightly fitted. The height difference between the first stepped portion 63 and the second stepped portion 64 of the second insulating portion 62 is also 0.5mm to ensure a perfect match with the corresponding parts of the explosion-proof valve 2.

[0109] The second insulating part 62 is made of PBT material, which has good insulation performance and mechanical strength. The thicknesses of the first stepped part 63 and the second stepped part 64 are 1.5mm and 1.0mm respectively, ensuring sufficient electrical isolation distance. Thus, through this stepped design, the electrical isolation path between the orifice plate 5 and the explosion-proof valve 2 is significantly optimized, reducing the risk of current leakage.

[0110] In related technologies, during actual assembly, an unavoidable height difference will form between the outer periphery of the top cover and the outer periphery of the explosion-proof valve, resulting in what is known as a "height difference gap." Understandably, although this height difference is caused by fitting defects during the manufacturing process, it is almost impossible to avoid due to technological limitations.

[0111] Therefore, in order to address the technical deficiencies existing in the aforementioned related technologies, such as Figure 4 As shown, according to some embodiments of the present invention, the outer periphery of the explosion-proof valve 2 is bent away from the orifice plate 5 to form a limiting part. The limiting part is arranged around the outer periphery of the top cover 1, and a sealing ring 3 is also arranged around the outer side of the limiting part. A sealing protrusion 31 is provided on the inner wall of the sealing ring 3. The sealing protrusion 31 is used to fill and seal the height difference gap between the limiting part and the outer periphery of the top cover 1.

[0112] It is understood that the present invention has a sealing protrusion 31 on the inner wall of the sealing ring 3. The main function of the sealing protrusion 31 is to make up for the gap caused by the height difference between the top cover 1 and the explosion-proof valve 2, and to achieve effective sealing by embedding it into the gap.

[0113] Specifically, the sealing mechanism of the sealing protrusion 31 is as follows: The first sealing protrusion 31 is specifically designed to fill and seal these unavoidable height difference gaps. Through an interference fit (i.e., the size of the sealing protrusion 31 is slightly larger than the gap size), it ensures that the seal is maintained even with minor manufacturing errors or material deformation. Thus, this design not only enhances the overall sealing performance of the battery cap but also improves the safety and stability of the battery, preventing external impurities from entering the battery and affecting its normal operation.

[0114] In this way, the sealing protrusion 31 on the sealing ring 3 effectively seals the height difference gap, ensuring that the battery can maintain good sealing and safety even in the presence of manufacturing errors, thereby overcoming the problem of poor sealing performance of battery caps in related technologies.

[0115] In addition, the design of the annular limiting part allows the top cover 1 to be securely placed on the explosion-proof valve 2, reducing the risk of displacement caused by vibration or external impact and enhancing the stability of the entire battery cap structure. Furthermore, the height difference gap between the annular limiting part and the top cover 1 is carefully designed to ensure that the sealing protrusion 31 can be perfectly embedded and provide a reliable sealing effect, thereby improving the overall sealing performance.

[0116] like Figure 2 and Figure 3 As shown, the battery according to the second aspect embodiment of the present invention includes a battery cap as described in the first aspect embodiment of the present invention, and further includes a cell assembly 8 and a battery housing 7. The cell assembly 8 is installed inside the battery housing 7, and the battery cap covers the top opening of the battery housing 7. A perforated plate 5 is electrically connected to the tabs inside the cell assembly 8.

[0117] The following is a specific embodiment of a battery.

[0118] like Figures 1 to 5 As shown, in this specific embodiment, the top cover 1 is made of 0.8mm thick aluminum alloy and is fixed to the explosion-proof valve 2 by laser welding to ensure good conductivity and corrosion resistance. The outer periphery of the explosion-proof valve 2 includes a first outer ring 22 and a second outer ring 23 with a height difference of 0.5mm. The limiting part is bent away from the orifice plate 5 and is arranged around the outer periphery of the top cover 1 with a height of 0.8mm. The sealing ring 3 is made of silicone rubber and has an annular sealing protrusion 31 with a height of 0.3mm and a width of 0.7mm on its inner wall, which surrounds the outside of the limiting part and fills and seals the gap between the limiting part and the outer periphery of the top cover 1.

[0119] The orifice plate 5 has a thickness of 0.6 mm in its middle section and is connected to the middle section of the explosion-proof valve 2 by laser welding. Its outer peripheral wall has an inwardly recessed engagement groove with an interference fit controlled at 0.1 mm, which engages with the engagement protrusion 65 of the first insulating part 61. The second insulating part 62 includes a first stepped part 63 and a second stepped part 64 with heights of 1.5 mm and 1.0 mm respectively, which abut against the first outer ring part 22 and the second outer ring part 23 of the explosion-proof valve 2. The first insulating part 61 surrounds the outer peripheral wall of the orifice plate 5, providing electrical isolation.

[0120] The positive electrode tab is made of 0.2mm thick nickel sheet and is fixed to the perforated plate 5 by laser welding. The negative electrode tab is also made of nickel sheet and is welded to the negative terminal inside the battery casing 7. The cell assembly 8 consists of multiple layers of positive and negative electrode materials and a separator, each layer being approximately 0.15mm thick, with the overall thickness adjusted according to the battery capacity. The battery casing 7 is made of 0.6mm thick stainless steel, with a top opening diameter of 18mm for installing the battery cap, and is designed with a groove that matches the limiting part of the explosion-proof valve 2 to ensure effective sealing of the sealing ring 3.

[0121] The entire cell assembly 8 is precisely placed inside the battery casing 7. The positive electrode tab is fixed to the perforated plate 5 by laser welding, and the negative electrode tab is welded to the negative terminal inside the battery casing 7, ensuring unobstructed current path. This design not only improves the mechanical stability and electrical performance of the battery but also enhances its safety and reliability, making it suitable for demanding applications such as power and energy storage batteries.

[0122] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cap, characterized in that, include: A top cover (1) and an explosion-proof valve (2), wherein the top cover (1) is disposed on the top of the explosion-proof valve (2); An orifice plate (5) is installed at the bottom of the explosion-proof valve (2) and at least partially contacts the bottom of the explosion-proof valve (2); An insulating component (6) is installed between the orifice plate (5) and the explosion-proof valve (2). The insulating component (6) has a mating groove with an opening facing the orifice plate (5). The orifice plate (5) is interference-fitted into the mating groove.

2. The battery cap according to claim 1, characterized in that, The middle part of the orifice plate (5) is in contact with and fixedly connected to the middle part of the explosion-proof valve (2); the insulating part (6) is installed between the outer peripheral part of the orifice plate (5) and the outer peripheral part of the explosion-proof valve (2), and the insulating part (6) is annular and coaxially arranged with the orifice plate (5).

3. The battery cap according to claim 2, characterized in that, The insulating member (6) includes a first insulating part (61) and a second insulating part (62), the first insulating part (61) and the second insulating part (62) are connected to each other and are arranged at an angle; The first insulating part (61) is disposed around the outer peripheral wall of the orifice plate (5), and the second insulating part (62) is sandwiched between the explosion-proof valve (2) and the orifice plate (5). The inner walls of the first insulating part (61) and the second insulating part (62) together define the mating groove.

4. The battery cap according to claim 3, characterized in that, The inner wall of the first insulating part (61) has a locking protrusion (65) that protrudes into the mating groove, and the outer peripheral wall of the perforated plate (5) abuts against the locking protrusion (65) and is interference-fitted with it.

5. The battery cap according to claim 4, characterized in that, The outer peripheral wall of the perforated plate (5) is provided with an inwardly recessed engagement groove, and the clip and protrusion are interference-fitted in the engagement groove.

6. The battery cap according to claim 4, characterized in that, The interference fit between the perforated plate (5) and the engaging protrusion (65) is between 0.05mm and 0.2mm.

7. The battery cap according to any one of claims 3 to 6, characterized in that, The outer periphery of the explosion-proof valve (2) is stepped, and correspondingly, the second insulating part (62) is stepped, with the upper surface of the second insulating part (62) abutting against the lower surface of the outer periphery of the explosion-proof valve (2).

8. The battery cap according to claim 7, characterized in that, The outer peripheral portion of the explosion-proof valve (2) includes a first outer ring portion (22) and a second outer ring portion (23), wherein the first outer ring portion (22) is higher than the second outer ring portion (23) and is located outside the second outer ring portion (23); The second insulating portion (62) includes a first stepped portion (63) and a second stepped portion (64), wherein the first stepped portion (63) is higher than the second stepped portion (64) and is located outside the second stepped portion (64); The first stepped portion (63) abuts against the first outer ring portion (22), and the second stepped portion (64) abuts against the second outer ring portion (23).

9. The battery cap according to any one of claims 3 to 6, characterized in that, The outer periphery of the explosion-proof valve (2) is bent away from the orifice plate (5) to form a limiting part. The limiting part is arranged around the outer periphery of the top cover (1), and a sealing ring (3) is also arranged around the outer side of the limiting part. A sealing protrusion (31) is provided on the inner wall of the sealing ring (3). The sealing protrusion (31) is used to fill and seal the height difference gap between the limiting part and the outer periphery of the top cover (1).

10. A battery, characterized in that, include: Battery cap as described in any one of claims 1 to 9; The battery housing (7) and the cell assembly (8) are installed inside the battery housing (7), and the battery cap is placed over the top opening of the battery housing (7), wherein the perforated plate (5) is electrically connected to the tab inside the cell assembly (8).

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