A top cover assembly and a single battery

Abstract

The utility model discloses a top cover assembly and single battery, top cover assembly includes top cover, explosion -proof valve and support piece, top cover is provided with explosion -proof hole, explosion -proof valve is connected with top cover cover and seals explosion -proof hole, support piece is connected with top cover, and support piece is provided with main hole, auxiliary hole and flow channel, and flow channel is communicated main hole and auxiliary hole, and the projection in the thickness direction of top cover, and main hole covers explosion -proof hole, and auxiliary hole and explosion -proof hole are spaced apart. The utility model design has improved the drainage efficiency significantly, avoided the pressure accumulation, and improved the safety of the battery body.

Description

Technical Field

[0001] This utility model relates to the technical field of top cover components, and more particularly to a top cover component and a single battery cell. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage systems, and portable electronic devices, secondary batteries such as lithium-ion batteries have been widely used as the main energy storage and supply units. As the basic building block of battery modules and systems, the safety performance of individual cells directly affects the reliability of the entire battery system and the safety of end products.

[0003] During actual battery use, factors such as external short circuits, overcharging, over-discharging, high temperatures, and mechanical shocks can cause abnormal states inside the battery, leading to a rapid increase in internal gas or electrolyte and a rapid rise in internal pressure. If this internal pressure cannot be released effectively and in a timely manner, it can easily cause the battery casing to expand, deform, or even explode, resulting in serious safety accidents such as equipment damage and personal injury. Therefore, improving the pressure relief and explosion-proof capabilities of individual battery cells under abnormal conditions has become an important technical direction in battery structural design.

[0004] Therefore, existing technologies typically incorporate an explosion-proof valve on the top cover of a single battery cell. When the internal pressure exceeds a set threshold, the explosion-proof valve opens, allowing gas or electrolyte to escape, thereby releasing pressure and ensuring battery safety. However, traditional explosion-proof structures usually only have a single explosion-proof hole and valve on the top cover, resulting in a single discharge path, low pressure discharge efficiency, poor discharge, and localized pressure concentration. When abnormal pressure is concentrated along a particular path, it can easily cause the explosion-proof valve to operate slowly or fail, affecting the safety of the battery itself. Utility Model Content

[0005] One objective of this invention is to provide a top cover assembly and a single battery cell to solve the problem that when abnormal pressure is concentrated in a certain path, it can easily lead to the explosion-proof valve operating slowly or failing.

[0006] To achieve the above objectives, the present invention provides a solution as follows: the top cover assembly includes a top cover, an explosion-proof valve, and a support member; the top cover has an explosion-proof hole; the explosion-proof valve is connected to the top cover and seals the explosion-proof hole; the support member is connected to the top cover and has a main hole, a secondary hole, and a flow channel, the flow channel connecting the main hole and the secondary hole, and the projection of the main hole in the thickness direction of the top cover shows that the explosion-proof hole is covered by the secondary hole and the explosion-proof hole is spaced apart.

[0007] Optionally, the support includes a base part and a functional part. The base part is connected to the top cover, and the functional part is connected to the base part and protrudes away from the top cover. The functional part has a main hole, a secondary hole and a flow channel. The axial direction of the main hole and the axial direction of the secondary hole are perpendicular to the top cover, respectively.

[0008] Optionally, the functional part includes a main part and a sub-part that are interconnected, the main part having a main hole and the sub-part having a secondary hole and a flow channel.

[0009] Optionally, the number of sub-parts is two or four, and they are arranged symmetrically around the main part.

[0010] Optionally, a first sub-hole is provided on the side wall of the main part, and the first sub-hole is connected to the main hole; and / or a second sub-hole is provided on the side wall of the secondary part, and the second sub-hole is connected to the flow channel.

[0011] Optionally, the functional part also includes a stop, which is disposed in the main hole and connected to the main part.

[0012] Optionally, in the length direction of the top cover, the width of the main hole is A, the width of the stop is B, and 0.1A≤B≤0.3A.

[0013] Optionally, the functional section also includes reinforcing ribs, which are disposed in the flow channel and connected to the sub-section.

[0014] Optionally, in the thickness direction of the top cover, the height of the reinforcing rib is C, and the depth of the flow channel is D, where 0.3D≤C≤0.6D.

[0015] To achieve the above objectives, the present invention provides a solution in which a single battery cell comprises: a battery cell, a casing, and any one of the aforementioned top cover assemblies; the battery cell is disposed within the casing, and the top cover assembly is connected to the casing.

[0016] The beneficial effects of this utility model are as follows: This embodiment, by setting a support component with a main hole, a secondary hole, and a flow channel in the top cover assembly, allows excrement to either directly burst through the explosion-proof valve through the main hole in abnormal conditions, or flow into the flow channel through the secondary hole and then into the main hole for discharge. This solves the technical problems of traditional single-cell discharge paths, low pressure discharge efficiency, and untimely pressure release. This structure not only improves the safety performance of the battery but also ensures the battery's sealing performance under daily use, meeting the dual requirements of sealing and explosion protection. Simultaneously, the top cover assembly structure has strong adaptability, suitable for both stacked and wound cell structures, expanding the product's application range. Furthermore, the flow channel design guides some of the excrement towards the main hole, avoiding pressure concentration on a single path and improving the uniformity and efficiency of discharge. In summary, this technical solution, by optimizing the top cover assembly structure, effectively improves the safety and reliability of single-cell batteries in abnormal conditions, significantly enhances the overall safety performance of the product, and solves the technical problems of low pressure discharge efficiency and a single discharge path in traditional solutions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of the top cover assembly provided in an embodiment of the present utility model;

[0019] Figure 2 This is an exploded view of the top cover assembly provided in an embodiment of the present utility model;

[0020] Figure 3 This is a structural schematic diagram of the support member provided in an embodiment of the present invention from a first-view perspective;

[0021] Figure 4 This is a structural schematic diagram of the support member provided in an embodiment of the present invention from a second perspective;

[0022] Figure 5 This is a top view of the support member provided in an embodiment of the present utility model.

[0023] Explanation of icon numbers:

[0024] Top cover assembly 100, top cover 20, explosion-proof hole 201, explosion-proof valve 30, support component 10;

[0025] Main hole 101, secondary hole 102, flow channel 103, base part 11, functional part 12, main part 13;

[0026] Sub-part 14, first sub-hole 15, second sub-hole 16, stop 17, reinforcing rib 18. Detailed Implementation

[0027] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings, clearly and comprehensively demonstrating the technical solution. It should be noted that the listed embodiments are only a part of this utility model, and not all possible implementations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] Please see Figures 1 to 4 As shown, Figure 1 This is a structural schematic diagram of the top cover assembly 100 provided in this embodiment of the utility model. Figure 2 This is an exploded view of the top cover assembly 100 provided in this embodiment of the utility model. Figure 3This is a structural schematic diagram of the support member 10 provided in this embodiment of the present invention from a first-view perspective. Figure 4 This is a structural schematic diagram of the support member 10 provided in this embodiment of the present invention from a second perspective.

[0029] This embodiment discloses a single-cell battery structure designed to improve battery safety performance under abnormal conditions. The single-cell battery includes a cell, a casing, and a top cover assembly 100. The cell is disposed inside the casing and can have either a stacked or wound structure to meet the needs of different application environments. The top cover assembly 100 is connected to the casing and seals the cell within it, ensuring the cell's sealing and safety during use. Specifically, the top cover assembly 100 includes a top cover 20, an explosion-proof valve 30, and a support member 10. The top cover 20 has an explosion-proof hole 201, and the explosion-proof valve 30 is connected to the top cover 20 and covers the explosion-proof hole 201, thus sealing it. The support member 10 is also connected to the top cover 20 and has a main hole 101, a secondary hole 102, and a flow channel 103, wherein the flow channel 103 connects the main hole 101 and the secondary hole 102. Projected along the thickness direction of the top cover 20, the main hole 101 covers the explosion-proof hole 201, while the secondary hole 102 is spaced apart from the explosion-proof hole 201.

[0030] This structure effectively functions when a single battery cell malfunctions (such as an internal short circuit or overcharging causing a sharp increase in internal pressure). When the pressure of gases or electrolytes within the casing becomes excessive, the waste can directly pass through the main port 101, rupturing the explosion-proof valve 30 and rapidly exiting the casing through the explosion-proof port 201, thus releasing internal pressure promptly. Simultaneously, waste within the casing can also enter the flow channel 103 through the secondary port 102, ultimately flowing into the main port 101 and exiting the battery, achieving multi-path drainage. This design significantly improves drainage efficiency, prevents pressure buildup, and enhances the battery's overall safety.

[0031] This embodiment, by incorporating a support member 10 with a main hole 101, a secondary hole 102, and a flow channel 103 within the top cover assembly 100, allows excrement to either directly pass through the main hole 101 to break through the explosion-proof valve 30 and be discharged, or flow through the secondary hole 102 into the flow channel 103 and then back into the main hole 101 for discharge, thus solving the technical problems of traditional single-cell batteries, such as a single discharge path, low pressure discharge efficiency, and untimely pressure release. This structure not only improves the battery's safety performance but also ensures the battery's sealing performance under normal use, balancing the dual requirements of sealing and explosion prevention. Furthermore, the top cover assembly 100 structure has strong adaptability, suitable for both stacked and wound cell structures, expanding the product's application range. In addition, the flow channel 103 design guides some of the excrement towards the main hole 101, preventing pressure concentration on a single path and improving the uniformity and efficiency of discharge. In summary, this technical solution effectively improves the safety and reliability of individual batteries under abnormal conditions by optimizing the structure of the top cover assembly 100, significantly enhances the overall safety performance of the product, and solves the technical problems of low pressure discharge efficiency and single discharge path in traditional solutions.

[0032] This embodiment relates to a support member 10 structure for a top cover assembly 100 of a single-cell battery. The support member 10 includes a base portion 11 and a functional portion 12. The base portion 11 is fixedly connected to the top cover 20, providing support and stability. The functional portion 12 is connected to the base portion 11 and protrudes away from the top cover 20, extending from the base portion 11 into the cell. The functional portion 12 has a main hole 101, a secondary hole 102, and a flow channel 103. The axes of the main hole 101 and the secondary hole 102 are perpendicular to the top cover 20. This design ensures that waste can enter the top cover assembly 100 via the functional portion 12 through the shortest path when pressure is abnormal, reducing the adverse effects of flow resistance and path bending. The flow channel 103 connects the main hole 101 and the secondary hole 102, providing a multi-path flow channel for waste.

[0033] When a single battery cell malfunctions, such as due to increased internal pressure, waste material in the casing can be discharged directly through the main hole 101 of the functional section 12, or it can flow into the main hole 101 through the secondary hole 102 and the flow channel 103, and be discharged together. Since the axes of both the main hole 101 and the secondary hole 102 are perpendicular to the top cover 20, waste material can be discharged more efficiently and quickly through the explosion-proof structure, effectively improving the timeliness and reliability of pressure release.

[0034] This technical solution solves the problems of single-function support member 10, unreasonable drainage path design, and low flow efficiency in traditional structures by adopting a support member 10 structure including a base part 11 and a functional part 12, with the functional part 12 protruding away from the top cover 20, and by setting a main hole 101, a secondary hole 102, and a flow channel 103 on the functional part 12, with the axes of the main and secondary holes 102 perpendicular to the top cover 20. Specifically, this solution optimizes the spatial layout of the drainage path, allowing waste to be discharged from the battery more directly, shortening the drainage path, reducing flow resistance, and improving drainage efficiency under high pressure. At the same time, the setting of the flow channel 103 diversifies the drainage path, further improving overall safety. In summary, this technical solution, through structural innovation, improves the pressure discharge efficiency and safety of a single battery cell under abnormal conditions, thereby achieving higher explosion-proof and safety protection effects.

[0035] This embodiment relates to an improved support member 10 structure for a single-cell battery top cover assembly 100. The functional portion 12 of the support member 10 includes a main portion 13 and a secondary portion 14 connected to each other. The main portion 13 has a main hole 101, and the secondary portion 14 has a secondary hole 102 and a flow channel 103. The main portion 13 and the secondary portion 14 are integrated into a single unit through integral molding or tight connection, ensuring structural stability and sealing. The main hole 101 and the secondary hole 102 are respectively located at appropriate positions on the main portion 13 and the secondary portion 14. The flow channel 103 connects the secondary hole 102 and the main hole 101, providing a pathway for the flow of waste.

[0036] In practical applications, when a single battery cell experiences internal abnormalities (such as pressure increases due to overcharging or short circuits), the gas or electrolyte residue inside the casing first enters the flow channel 103 through the secondary hole 102 of the secondary section 14, then flows from the flow channel 103 to the main hole 101 of the main section 13, and finally is discharged to the external environment through the main hole 101. Furthermore, the main hole 101 can also serve as a direct discharge channel, improving the response speed of pressure relief. The partitioned design of the main section 13 and the secondary section 14 allows different discharge paths to work collaboratively, ensuring discharge efficiency while also facilitating pressure distribution and flow balance.

[0037] This technical solution solves the problems of single discharge path and low discharge efficiency in the prior art by refining the functional part 12 into a main part 13 and a sub-part 14, and opening a main hole 101, a sub-hole 102, and a flow channel 103 in the main part 13 and the sub-part 14 respectively. Specifically, the sub-hole 102 and the flow channel 103 of the sub-part 14 provide backup and auxiliary flow paths for the discharged waste. Even if the discharge of the main hole 101 is partially restricted due to blockage or excessive pressure, the discharged waste can still flow smoothly to the main hole 101 through the sub-hole 102 and the flow channel 103 of the sub-part 14, realizing multi-path parallel pressure discharge, thereby effectively avoiding the risk of excessive internal pressure of the battery due to poor discharge. In addition, the clear division of labor between the main part 13 and the sub-part 14 helps to optimize their respective hydrodynamic performance and improve the overall discharge efficiency. In summary, this technical solution improves the pressure discharge capability and safety performance of a single battery cell under abnormal conditions through structural innovation, thereby achieving more efficient and reliable pressure release and protection effects.

[0038] This embodiment relates to an improved support member 10 structure, whose functional part 12 consists of a main part 13 and a secondary part 14. The main part 13 is located at the center of the structure and has a main hole 101, while the secondary part 14 has a secondary hole 102 and a flow channel 103. The key to this technical solution is that the number of secondary parts 14 can be two or four, and these secondary parts 14 are symmetrically arranged around the main part 13. Specifically, when there are two secondary parts 14, the two secondary parts 14 are located on opposite sides of the main part 13, distributed in an axially symmetrical manner; when there are four secondary parts 14, the four secondary parts 14 are distributed around the main part 13, forming a symmetrical arrangement of a cross or a square. The main part 13 and the secondary parts 14 are integrated into one piece by integral molding or other tight connection methods to ensure the integrity and sealing of the structure. The symmetrical layout between the secondary parts 14 and the main part 13 not only improves the overall structural stability but also provides diversified paths for pressure release and drainage.

[0039] This technical solution significantly increases the number of drainage channels by setting two or four symmetrically arranged secondary sections 14 surrounding the main section 13. This allows for simultaneous diversion and discharge of waste through multiple secondary holes 102 and flow channels 103 when abnormal internal pressure occurs in the battery, effectively improving drainage efficiency and avoiding drainage problems caused by blockage of a single channel. Simultaneously, the symmetrically distributed secondary sections 14 can evenly distribute internal pressure in multiple directions, helping to prevent structural damage caused by excessive local pressure and further enhancing the safety of the battery assembly. Furthermore, the symmetrical arrangement of multiple secondary sections 14 optimizes the fluid flow path, reduces flow resistance during drainage, and enhances drainage efficiency. The symmetrical structural arrangement also facilitates the assembly of the support member 10 with the top cover 20 and the battery body, improving structural adaptability and the convenience of subsequent production and maintenance. In summary, this embodiment solves the technical problems of insufficient discharge channels, low pressure discharge efficiency, and uneven pressure distribution in the prior art by increasing the number of secondary parts 14 and their symmetrical arrangement around the main part 13, thereby achieving efficient and reliable pressure release and significantly improving the safety performance of individual battery modules under abnormal operating conditions.

[0040] This embodiment relates to an improved structure of a support member 10. The support member 10 includes a main part 13 and at least one secondary part 14. The main part 13 is the core component of the support member 10, and a first sub-hole 15 is formed on its side wall, communicating with a main hole 101. Through this structural design, excrement outside the main part 13 can smoothly enter the main hole 101 through the first sub-hole 15, improving the collection and guidance capabilities of the excrement. Simultaneously, a second sub-hole 16 can also be formed on the side wall of the secondary part 14, communicating with a flow channel 103 inside the secondary part 14, thereby allowing excrement outside the secondary part 14 to enter the flow channel 103 through the second sub-hole 16, providing more pathways for further discharge of the excrement. The aforementioned first sub-hole 15 and second sub-hole 16 can be used individually or in combination to adapt to the needs of different product structures and actual working conditions. By opening sub-holes on the sidewalls of the main part 13 and / or the secondary part 14, the number and location of inlets for excrement to enter the main hole 101 or the flow channel 103 are effectively expanded, thereby improving the overall discharge efficiency.

[0041] In practical applications, the existing support structure 10 often suffers from low discharge efficiency due to the limited number of discharge channels and the single discharge path. Furthermore, it can even lead to the risk of accumulation in the event of partial blockage, affecting the safety and service life of the component. This technical solution addresses this by creating a first sub-hole 15 on the side wall of the main section 13, allowing excrement to directly enter the main hole 101 from the outside of the main section 13. This effectively increases the channels for excrement to flow into the main hole 101, improving its collection and discharge capacity. Simultaneously, by creating a second sub-hole 16 on the side wall of the secondary section 14, excrement can directly enter the flow channel 103 from the outside of the secondary section 14, further enriching the discharge paths and reducing the risk of blockage. The design of the first sub-hole 15 and the second sub-hole 16 not only enhances the diversion capacity of excrement but also enables multi-path coordinated discharge when the volume of excrement is large or a single path is blocked, significantly improving the safety and reliability of the discharge system. In summary, this technical solution optimizes the inflow and diversion paths of excrement by scientifically setting the first sub-hole 15 and / or the second sub-hole 16, significantly solving the technical problems of single discharge path, low discharge efficiency, and easy blockage in the existing structure, and achieving the technical effect of smooth discharge and safe and reliable system.

[0042] This embodiment relates to a functional part 12 structure that enhances structural strength. Specifically, the functional part 12 includes a main part 13 and a stop part 17 disposed in the main hole 101, and the stop part 17 is connected to the main part 13. The stop part 17 can be an integrally formed structure, or it can be firmly connected to the main part 13 through other connection methods (such as welding, screwing, or snap-fit). The stop part 17 is located inside the main hole 101 and can provide support and limit the wall of the main hole 101. The setting of the stop part 17 not only does not affect the normal channel function of the main hole 101, but also effectively distributes the external pressure and internal stress that the wall of the main hole 101 may bear.

[0043] In related technologies, due to the relatively thin structure or large length-to-diameter ratio of the main hole 101, it is prone to deformation under excessive stress during use, which in turn affects the sealing performance, stability, and service life of the entire functional part 12. To address this technical problem, this technical solution adds a baffle 17 to the main hole 101 and connects it to the main part 13, forming a locally reinforced structure. In this way, the baffle 17 can effectively disperse and bear part of the stress when the main hole 101 is subjected to external or internal loads, significantly improving the structural strength of the main part 13 and reducing the risk of functional failure due to deformation. Through the above technical solution, the main hole 101 maintains good geometric shape and dimensional stability, thereby ensuring the normal use and long-term reliability of the functional part 12. In summary, this embodiment, by setting a baffle 17 connected to the main part 13 in the main hole 101, solves the technical problems of easy deformation and insufficient structural strength of the main hole 101, achieving the technical effect of enhancing the structural strength of the main part 13 and preventing deformation of the main hole 101.

[0044] Please see Figures 1 to 5 As shown, Figure 5 This is a top view of the support member 10 provided in this embodiment of the utility model.

[0045] This embodiment features an optimized design for the support member 10. Along the length of the top cover 20, the width of the main hole 101 is set as A, and the width of the baffle 17 is set as B. To balance structural strength and venting capacity, the width B of the baffle 17 is limited to the range of 0.1A ≤ B ≤ 0.3A. Specifically, the baffle 17 is located inside the main hole 101 and connected to the main part 13, serving to strengthen the structure of the main hole 101 and distribute pressure. In actual manufacturing, a suitable width B of the baffle 17 can be selected based on the actual size of the main hole 101's width A, ensuring that it neither affects the main function of the main hole 101 nor fails to effectively improve structural safety.

[0046] In existing technologies, if the width B of the baffle 17 is too small, although it will not significantly obstruct the venting function of the main hole 101, its limited pressure-bearing area makes it prone to localized stress concentration under external pressure or impact, posing a safety hazard such as puncturing the battery cell, and failing to effectively protect the structural safety of the main hole 101 and the battery cell. If the width B of the baffle 17 is too large, although it can improve the pressure-bearing capacity, it will significantly occupy the space of the main hole 101, causing the venting channel to narrow, reducing the venting capacity, and affecting the normal venting performance of the product. This technical solution effectively balances structural strength and venting performance by limiting the width B of the baffle 17 to the range of 0.1A≤B≤0.3A.

[0047] When B≥0.1A, the baffle 17 has sufficient pressure-bearing area, which can effectively prevent the risk of puncturing the battery cell and improve the overall structural strength and safety.

[0048] When B≤0.3A, the baffle 17 will not occupy too much space in the main hole 101, and the main hole 101 can still maintain good exhaust capacity to ensure the normal operation of the product.

[0049] Therefore, by scientifically limiting the width of the baffle 17, this technical solution solves the problem of insufficient structural strength or reduced exhaust capacity that may be caused by improper setting of the width of the baffle 17, and achieves the technical effect of balancing the exhaust capacity of the main hole 101 with the improvement of structural strength.

[0050] This embodiment provides a functional part 12 structure with anti-deformation capability. Specifically, the functional part 12 includes a sub-part 14 and a flow channel 103 for the flow of medium. To improve the structural stability of the flow channel 103, a reinforcing rib 18 is provided inside the flow channel 103 and connected to the sub-part 14. The reinforcing rib 18 can be integrally formed with the sub-part 14, or it can be firmly connected to the sub-part 14 by welding, screwing, or other methods. The reinforcing rib 18 is located inside the flow channel 103 and provides support and reinforcement to the wall of the flow channel 103, enabling it to share and resist deformation stress when the flow channel 103 is subjected to external pressure or internal fluid impact.

[0051] In the prior art, the flow channel 103 is prone to deformation during use due to its thin structure or long length, caused by force, vibration or pressure fluctuations. This results in the flow channel 103 becoming narrower, which in turn affects the normal flow of the medium and even the stability and service life of the entire functional part 12.

[0052] This technical solution provides a reinforcing rib 18 within the flow channel 103, connected to the sub-part 14, thus making the reinforcing rib 18 an effective support point for the wall of the flow channel 103. In this way, under external loads or internal pressure, the reinforcing rib 18 can significantly improve the structural strength of the flow channel 103, preventing deformation, especially preventing narrowing. Therefore, this embodiment, through the provision of the reinforcing rib 18, solves the problem in the prior art where the flow channel 103 is prone to deformation and narrowing, affecting fluid flow, achieving the technical effects of improving the structural strength of the flow channel 103, preventing narrowing, and ensuring smooth flow of the medium.

[0053] This embodiment optimizes the dimensional relationship between the reinforcing rib 18 and the flow channel 103 in the top cover 20 structure. A reinforcing rib 18 is provided in the thickness direction of the top cover 20 to enhance structural strength. The height of the reinforcing rib 18 is C, and the depth of the flow channel 103 is D. To balance the venting capacity of the flow channel 103 with the structural support function of the reinforcing rib 18, the height C of the reinforcing rib 18 is limited to satisfy 0.3D≤C≤0.6D. Specifically, during the molding process of the flow channel 103, a suitable height C of the reinforcing rib 18 is selected according to the depth D of the flow channel 103, so that the reinforcing rib 18 can enhance structural strength without excessively occupying the space of the flow channel 103. The reinforcing rib 18 and the wall of the flow channel 103 can be integrally molded or firmly connected inside the top cover 20.

[0054] In the prior art, if the height C of the reinforcing rib 18 is set too small, although it will not significantly affect the space of the flow channel 103, its limited bearing area makes it difficult to provide sufficient structural support. This makes it prone to deformation under stress, leading to deformation or collapse of the flow channel 103, affecting the product's mechanical properties and service life. Conversely, if the height C of the reinforcing rib 18 is set too large, although it enhances the bearing capacity, it will significantly occupy the effective space of the flow channel 103, resulting in a reduced flow channel area, decreased exhaust capacity, and impact on the exhaust efficiency of the top cover 20, even causing poor media flow.

[0055] This technical solution achieves an organic combination of structural strength and venting capacity by limiting the height C of the reinforcing rib 18 to the range of 0.3D≤C≤0.6D. When C≥0.3D, the reinforcing rib 18 has sufficient bearing area, which can effectively share and resist external loads, improve the overall strength and stability of the flow channel 103 structure, and prevent the flow channel 103 from deforming due to stress. When C≤0.6D, the reinforcing rib 18 will not occupy too much space in the flow channel 103, ensuring that the flow channel 103 has good venting capacity and medium flow performance.

[0056] Therefore, by reasonably limiting the height of the reinforcing rib 18, this embodiment achieves the goal of improving the structural strength of the flow channel 103 and preventing deformation, while effectively ensuring the exhaust capacity of the flow channel 103. This solves the contradiction between structural support and unobstructed flow channel 103 in the prior art, and achieves a dual improvement in structural strength and exhaust performance.

Claims

1. A top cover assembly, characterized in that, The top cover assembly includes: The top cover has explosion-proof holes; An explosion-proof valve, connected to the top cover, seals the explosion-proof hole; and A support member is connected to the top cover. The support member has a main hole, a secondary hole, and a flow channel. The flow channel connects the main hole and the secondary hole. In the projection of the top cover in the thickness direction, the main hole covers the explosion-proof hole, and the secondary hole and the explosion-proof hole are spaced apart.

2. The top cover assembly according to claim 1, characterized in that, The support member includes a base portion and a functional portion. The base portion is connected to the top cover, and the functional portion is connected to the base portion and protrudes away from the top cover. The functional portion has the main hole, the secondary hole, and the flow channel. The axial direction of the main hole and the axial direction of the secondary hole are perpendicular to the top cover, respectively.

3. The top cover assembly according to claim 2, characterized in that, The functional part includes a main part and a sub-part that are connected to each other. The main part has the main hole, and the sub-part has the sub-hole and the flow channel.

4. The top cover assembly according to claim 3, characterized in that, The number of the sub-parts is two or four, and they are arranged symmetrically around the main part.

5. The top cover assembly according to claim 3, characterized in that, A first sub-hole is provided on the side wall of the main part, and the first sub-hole communicates with the main hole; and / or A second sub-hole is provided on the side wall of the sub-part, and the second sub-hole is connected to the flow channel.

6. The top cover assembly according to claim 3, characterized in that, The functional part also includes a stop, which is disposed in the main hole and connected to the main part.

7. The top cover assembly according to claim 6, characterized in that, Along the length of the top cover, the width of the main hole is A, and the width of the stop is B, where 0.1A≤B≤0.3A.

8. The top cover assembly according to claim 3, characterized in that, The functional part also includes a reinforcing rib, which is disposed in the flow channel and connected to the sub-part.

9. The top cover assembly according to claim 8, characterized in that, In the thickness direction of the top cover, the height of the reinforcing rib is C, and the depth of the flow channel is D, where 0.3D≤C≤0.6D.

10. A single-cell battery, characterized in that, The single battery cell includes: a cell, a housing, and a top cover assembly according to any one of claims 1 to 9, wherein the cell is disposed in the housing, and the top cover assembly is connected to the housing.

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