Battery top cover and battery

Abstract

The utility model provides a battery top cover and a battery. The battery top cover comprises a top cover body which is provided with a through hole; the sealing piece is connected to the through hole in a sealing mode and shields the through hole, a first flow collecting groove is formed in the edge, close to the sealing connection portion, of the sealing piece, the sealing piece is further provided with a second flow collecting groove, and the second flow collecting groove is located on the inner side of the first flow collecting groove and communicates with the first flow collecting groove. The battery sealing piece solves the problem that a battery sealing piece in the prior art is easy to crack during welding.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery top cover and a battery. Background Technology

[0002] In battery manufacturing, sealing aluminum sheets or cover plates are typically used to seal the electrolyte filling holes in the battery top cover to seal the battery cell. Currently, welding is the commonly used method. However, laser welding technology is prone to stress concentration and deformation, causing the sealing sheet to crack, which in turn leads to cell failure and seriously affects the cell's sealing and safety performance. Therefore, it is evident that existing technologies suffer from the problem of sealing sheet welding easily cracking, thus affecting processing quality. Utility Model Content

[0003] The main purpose of this application is to provide a battery top cover and a battery to solve the problem of easy cracking of the welding of battery sealing sheets in the prior art.

[0004] To achieve the above objectives, according to one aspect of this application, a battery top cover is provided, comprising: a top cover body having a through hole; a sealing member sealingly connected to the through hole and blocking the through hole, the sealing member having a first current collecting groove at an edge near the sealing connection portion, and the sealing member also having a second current collecting groove located inside the first current collecting groove and communicating with the first current collecting groove.

[0005] Furthermore, the central region of the seal has a recess, and the first and second collecting grooves are located at different heights in the recess, with the height of the first collecting groove being higher than that of the second collecting groove.

[0006] Furthermore, the first collecting groove is located on the upper surface at the top edge of the recess, and the second collecting groove is located on the bottom surface of the recess.

[0007] Furthermore, the bottom surface area within the recess is S0, and the total area of ​​all second collection channels is S, where S / S0 < 80%.

[0008] Furthermore, the first collecting groove extends circumferentially along the seal, wherein the first collecting groove is continuously arranged circumferentially along the seal and forms an annular groove; or there are multiple first collecting grooves, each of which is spaced apart circumferentially along the seal; or there are multiple first collecting grooves, each of which is spaced apart radially along the seal.

[0009] Furthermore, the seal also includes a drainage groove, the two ends of which are connected to the first and second collection grooves respectively, and the first collection groove is connected to the second collection groove through the drainage groove.

[0010] Furthermore, there is one second collecting channel and one diversion channel; or there is one second collecting channel and multiple diversion channels, each diversion channel is connected to a different position of the first collecting channel and is connected to the same second collecting channel; or there are multiple second collecting channels and multiple diversion channels, each second collecting channel is connected to the first collecting channel through each diversion channel, and each diversion channel is connected to a different position of the first collecting channel.

[0011] Furthermore, the drainage channel includes a first side and a second side extending along the length direction and disposed opposite to each other, with an included angle between the first side and the second side.

[0012] Furthermore, along the flow direction from the first collector channel to the second collector channel, the distance between the first side and the second side gradually decreases.

[0013] Furthermore, the sum of the included angles of all the drainage channels is less than or equal to 180°.

[0014] Furthermore, the outer circumferential edge of the seal has a welding point for welding to the top cover body, and a first distance greater than 0 is formed between the first collection groove and the welding point.

[0015] According to another aspect of this application, a battery is provided, including the battery top cover described above.

[0016] By applying the technical solution of this application, a first collecting groove is provided on the sealing element. Since the first collecting groove is close to the welding point on the inner wall of the through hole, the stress generated at the welding point due to uneven stress distribution during welding will push the high-temperature softened sealing material into the first collecting groove, allowing the material to flow into it and thus alleviating the stress problem at the welding point. Simultaneously, this embodiment also provides a second collecting groove. Because the second collecting groove is located inside and connected to the first collecting groove, when the material in the first collecting groove increases, the material can flow from the first collecting groove into the second collecting groove. This ensures that the first collecting groove can always receive the material flowing in due to stress, guaranteeing the stress-relieving effect of the first collecting groove. Furthermore, it avoids the problem of excessive material accumulation in the first collecting groove leading to new stress concentration, ensuring the stability of the welding process and the reliability of the welding quality. Moreover, the provision of the first and second collecting grooves can reduce the amount of material used in the sealing element, lower production costs, and provide easy visual identification with high recognizability. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 An isometric view of the battery top cover of this application is shown;

[0019] Figure 2 It shows Figure 1 Top view;

[0020] Figure 3 It shows Figure 1 Main sectional view;

[0021] Figure 4 An isometric view of the seal in Embodiment 1 is shown;

[0022] Figure 5 It shows Figure 4 A top view of the seal in the middle;

[0023] Figure 6 It shows Figure 5 Enlarged view of the central drainage channel;

[0024] Figure 7 It shows Figure 4 Main sectional view of the seal in the middle;

[0025] Figure 8 It shows Figure 7 Enlarged view of the welding point and the first flow collector;

[0026] Figure 9 A schematic diagram of the seal in Embodiment 2 is shown;

[0027] Figure 10 It shows Figure 9 Top view.

[0028] The above figures include the following reference numerals:

[0029] 10. Top cover body; 20. Sealing element; 21. First collection groove; 22. Second collection groove; 23. Recess; 24. Drainage groove; 241. First side; 242. Second side; 25. Welding point; 26. First planar section; 27. Inclined section; 28. Second planar section; 29. ​​Positioning hole. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] In this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0033] To address the problem of easy cracking during welding of battery sealing sheets in existing technologies, this application provides a battery top cover and a battery. The battery has the following battery top cover.

[0034] Example 1

[0035] like Figures 1 to 8 The battery top cover shown includes a top cover body 10 and a sealing member 20. The top cover body 10 has a through hole. The sealing member 20 is sealed and connected to the through hole and blocks the through hole. The sealing member 20 has a first current collecting groove 21 near the edge of the sealing connection part. The sealing member 20 also has a second current collecting groove 22. The second current collecting groove 22 is located inside the first current collecting groove 21 and communicates with the first current collecting groove 21.

[0036] In this embodiment, a first collecting groove 21 is provided on the sealing element 20. Since the first collecting groove 21 is close to the sealing connection part, that is, the welding point 25 on the inner wall of the through hole, the stress generated by the uneven stress distribution at the welding point 25 during welding will push the high-temperature softened sealing material into the first collecting groove 21, allowing the material to flow into the first collecting groove 21, thereby alleviating the stress problem at the welding point. At the same time, this embodiment also provides a second collecting groove 22. Since the second collecting groove 22 is located inside the first collecting groove 21 and is connected to the first collecting groove 21, when the material in the first collecting groove 21 increases, the material can flow from the first collecting groove 21 into the second collecting groove 22. This ensures that the first collecting groove 21 can always receive the material flowing in due to stress, ensuring the stress-relieving effect of the first collecting groove 21. Moreover, it can also avoid the problem of excessive material accumulation in the first collecting groove 21 causing new stress concentration, ensuring the stability of the welding process and the reliability of the welding quality. Meanwhile, the arrangement of the first and second flow channels 21 can reduce the amount of material used in the seal 20, lower production costs, and make the appearance easy to identify with high recognizability.

[0037] like Figure 4 , Figure 5 and Figure 7As shown, in this embodiment, the central region of the seal 20 has a recess 23. Since the seal 20 is located at the top of the top cover body 10, the recess 23 is recessed downwards, thus making the seal 20 form a bowl-shaped structure. The peripheral edges of the bowl-shaped structure are higher, while the central region is lower. In this embodiment, the first collecting channel 21 and the second collecting channel 22 are located at different heights of the recess 23, and the height of the first collecting channel 21 is higher than the height of the second collecting channel 22. In this way, when there is a lot of material in the first collecting channel 21, the material can spontaneously flow from the first collecting channel 21 into the second collecting channel 22 under the action of gravity, thereby realizing the collection of material and avoiding the accumulation in the first collecting channel 21.

[0038] like Figure 4 , Figure 5 and Figure 7 As shown, the bowl-shaped structure specifically includes a first planar segment 26, an inclined segment 27, and a second planar segment 28. The first planar segment 26 is the upper surface at the top edge of the bowl-shaped structure, the second planar segment 28 is the bottom surface inside the bowl-shaped structure, and the inclined segment 27 is the transition segment between the first planar segment 26 and the second planar segment 28. The inclined segment 27 is inclined relative to both the first planar segment 26 and the second planar segment 28, forming a certain angle. The specific value of the angle can be set as needed, and can be in the range of 0-180 degrees. In this embodiment, a first collecting groove 21 is provided on the first planar segment 26, i.e., the plane with the higher height of the bowl-shaped structure, and a second collecting groove 22 is provided on the second planar segment 28, i.e., the bottom surface inside the bowl-shaped structure. This ensures that, on the one hand, the first planar segment 26 is basically flush with the upper surface of the top cover body 10 when the sealing member 20 is installed at the through hole, thus guaranteeing the welding effect; on the other hand, it creates a large height difference between the first collecting groove 21 and the second collecting groove 22, ensuring that the material in the first collecting groove 21 can flow into the second collecting groove 22, thus guaranteeing the material dispersion effect. Of course, the structural form of the sealing member 20 is not limited to the method described in this embodiment. A certain arc-shaped recess 23 can be provided in the middle of the sealing member 20, or the sealing member 20 can be directly set as a plane without a recess 23, utilizing the connectivity between the first collecting groove 21 and the second collecting groove 22 to allow material to flow into the second collecting groove 22.

[0039] Preferably, the area of ​​the bottom surface within the recess 23, i.e., the area of ​​the second planar segment 28, is S0, and the total area of ​​all the second collecting channels 22 is S. Since the number of second collecting channels 22 can be set as needed, either one or more, the area S here refers to the total area of ​​all the second collecting channels 22. When only one second collecting channel 22 is provided, the area S is the area of ​​that second collecting channel 22. When there are multiple second collecting channels 22, the area S is the sum of the areas of all the second collecting channels 22. Regarding the aforementioned areas S0 and S, this embodiment adopts S / S0 < 80%, that is, the total area of ​​all the second collecting channels 22 is less than 80% of the area of ​​the bottom surface within the recess 23. This ensures that the arrangement of the second collecting channels 22 can both achieve the function of collecting materials and avoid affecting the structure of the sealing element 20, thus ensuring that the sealing element 20 can normally perform its sealing and other functions.

[0040] It should be noted that the number and specific shape of the first and second flow collection channels 21 and 22 can be adjusted as needed. For example... Figure 4 and Figure 5 As shown, in this embodiment, there is one first collecting groove 21. The first collecting groove 21 extends circumferentially along the seal 20 and is continuously arranged on the first planar section 26 along the circumferential direction of the seal 20, thus forming an annular groove. This annular groove covers a 360-degree circumferential range of the seal 20. Regardless of the position of the seal 20 when it is welded to the top cover body 10, material can flow into the first collecting groove 21, ensuring the effectiveness of the first collecting groove 21 in collecting material and relieving stress. In this embodiment, there are multiple second collecting grooves 22, arranged on the second planar section 28 along the circumferential direction of the seal 20. Thus, the second collecting grooves 22 can respectively receive material flowing out from different positions of the first collecting grooves 21, ensuring the effective collection of material within the first collecting grooves 21.

[0041] In this embodiment, in order to facilitate the connection between the first collecting groove 21 and the second collecting groove 22, the sealing member 20 also includes a guide groove 24. The two ends of the guide groove 24 are connected to the first collecting groove 21 and the second collecting groove 22 respectively. In this way, the first collecting groove 21 is connected to the second collecting groove 22 through the guide groove 24, and the material in the first collecting groove 21 can enter the second collecting groove 22 in the guide groove 24.

[0042] like Figure 5As shown, since the diversion channel 24 is located between the first collecting channel 21 and the second collecting channel 22, the diversion channel 24 is actually located at the inclined section 27. Therefore, the diversion channel 24 is set in an inclined structure along the inclined section 27. The top end of the diversion channel 24 is connected to the first collecting channel 21, and the bottom end is connected to the second collecting channel 22. This allows the material in the first collecting channel 21 to enter the diversion channel 24 under its own gravity, and then flow downward into the second collecting channel 22 in the inclined diversion channel 24, where it is collected. This enables the first collecting channel 21 to continuously collect materials and relieve stress.

[0043] It should be noted that the flow channel 24 may not be provided between the first flow channel 21 and the second flow channel 22. In this case, the connection between the first flow channel 21 and the second flow channel 22 can be achieved through the external space of the sealing sheet or the recess 23. In this case, the material in the first flow channel 21 can be used to spontaneously enter the second flow channel 22 when there is a lot of material overflowing, so as to achieve secondary collection of the material. That is, when there is a lot of material in the first flow channel 21, the material will overflow from the first flow channel 21 and enter the second flow channel 22. Meanwhile, since the first collecting groove 21 and the second collecting groove 22 in this embodiment are arranged with a height difference, when the material overflows from the first collecting groove 21 without the guide groove 24, it can spontaneously flow downwards along the inclined section 27 under the action of gravity and enter the second collecting groove 22. The difference between this method and the method of setting the guide groove 24 in this application is that without the guide groove 24, the flow of material has a higher degree of uncertainty, which may affect other parts of the seal 20. The setting of the guide groove 24 can limit the flow range of the material, so that the material can only flow in each groove and will not flow to other positions and affect other parts of the seal 20, thereby ensuring the functional effect of the seal 20 itself. Based on this, this embodiment preferably adopts the method of setting the guide groove 24.

[0044] Similar to the aforementioned arrangement of the first collecting trough 21, the number and arrangement of the second collecting trough 22 and the diversion trough 24 can also be configured as needed. Since this embodiment uses multiple second collecting troughs 22 arranged at intervals along the circumference of the seal 20, multiple diversion troughs 24 are also used, and they are arranged in a one-to-one correspondence with the second collecting troughs 22. That is, each second collecting trough 22 is connected to the first collecting trough 21 through a corresponding diversion trough 24. The diversion troughs 24 are arranged at intervals along the circumference of the inclined section 27, so that the collection by each diversion trough 24 and the second collecting trough 22 does not affect each other. More specifically, this embodiment has four second collecting troughs 22 and four diversion troughs 24; of course, their specific numbers can be adjusted as needed.

[0045] Meanwhile, in this embodiment, each diversion channel 24 is connected to a different position of the first collection channel 21, so that different diversion channels 24 can divert flow to different positions of the first collection channel 21, ensuring that the material in the first collection channel 21 can flow into the second collection channel 22 as soon as possible through the diversion channels 24, thereby ensuring the effect of continuous stress relief in the first collection channel 21.

[0046] In an embodiment not shown, only one second collecting channel 22 is provided, but multiple guiding channels 24 are still provided. Different guiding channels 24 are connected to different positions of the first collecting channel 21, and different guiding channels 24 are connected to different positions of the second collecting channel 22, so that the guiding channels 24 can uniformly guide the material from different positions in the first collecting channel 21 into the same second collecting channel 22. Since the first collecting channel 21 is set in the form of an annular channel, the second collecting channel 22 can also be set as an annular groove, and the guiding channels 24 can be located at different positions around the annular groove.

[0047] In another embodiment not shown, there is only one second collecting groove 22 and one diversion groove 24, so that the second collecting groove 22 is connected to the first collecting groove 21 through a diversion groove 24. This method is relatively simple and the manufacturing difficulty of the seal 20 is small.

[0048] like Figure 6 As shown, in this embodiment, the flow channel 24 includes a first side 241 and a second side 242 extending along the length direction and arranged opposite to each other. The first side 241 and the second side 242 are the sides of the flow channel 24 extending from the first collection channel 21 to the second collection channel 22. In this embodiment, the first side 241 and the second side 242 are not arranged in parallel, but rather form an angle between them. Thus, the width of the flow channel 24 is not uniform everywhere, but varies in size, thereby facilitating the flow of material within the flow channel 24.

[0049] Preferably, along the flow direction from the first collecting channel 21 to the second collecting channel 22, the distance between the first side 241 and the second side 242 gradually decreases. That is, along the flow direction of the material in the guiding channel 24, the distance between the first side 241 and the second side 242, which is the width of the guiding channel 24, gradually decreases. In this way, the width of the first connecting end of the guiding channel 24 that connects with the first collecting channel 21 is larger, so that more material can be received into the guiding channel 24, while the width of the second connecting end of the guiding channel 24 that connects with the second collecting channel 22 is smaller, so that the material can flow quickly into the second collecting channel 22.

[0050] More preferably, the sum of the included angles of all the drainage channels 24 is less than or equal to 180°, that is, the annular angle or total area of ​​the drainage channels 24 together is less than or equal to 50% of the circumferential angle or area of ​​the inclined section 27. Since this embodiment has four drainage channels 24, the above form specifically means that if the included angle of a single drainage channel 24 is A, then 4A ≤ 180 degrees. In this way, the size of the drainage channels 24 can be reasonably allocated, so that the arrangement of the drainage channels 24 can both meet the needs of material drainage and reduce the impact of the drainage channels 24 on the structure of the sealing element 20.

[0051] like Figure 7 and Figure 8 As shown, in this embodiment, the outer circumferential edge of the seal 20 has a welding point 25 for welding to the top cover body 10. The seal 20 is welded to the inner wall of the through hole through the welding point 25. In this embodiment, a first distance greater than 0 is formed between the first flow collecting groove 21 and the welding point 25. That is to say, the first flow collecting groove 21 is not connected to the peripheral side surface of the seal 20, and there is a certain distance between it and the peripheral side surface. The first flow collecting groove 21 is not located at the boundary, so that the material has a flow process during welding, ensuring the effect of stress dispersion and elimination. The specific size of the above-mentioned first distance can be adjusted according to the actual situation.

[0052] like Figure 4 As shown, in this embodiment, a positioning hole 29 is also provided at the center of the sealing member 20. Since a recess 23 is provided in the central region of this embodiment, the positioning hole 29 is actually located at the center of the second planar segment 28 of the recess 23. Furthermore, the positioning hole 29 does not penetrate the sealing member 20, and the second collecting groove 22 does not penetrate the sealing member 20, thereby allowing the sealing member 20 to maintain its function of sealing the through hole. The positioning hole 29 facilitates welding positioning during welding, thereby ensuring that the welding position of the welding equipment is at the welding point 25.

[0053] like Figure 7As shown, the specific structural form of the first collecting groove 21 in this embodiment can be set as needed, and can be in the form of triangular groove, rectangular groove, trapezoidal groove, circular groove, etc. In this embodiment, the first collecting groove 21 adopts a triangular groove. Similarly, the specific structural form of the second collecting groove 22 can also be set as needed, and can be in the form of rectangular groove, arc groove, fan-shaped groove, etc. In this embodiment, the second collecting groove 22 adopts a fan-shaped groove structure, so that it can be arranged in a circumferential manner with multiple second collecting grooves 22. In addition, in this embodiment, the sidewall of the fan-shaped groove is set at an inclination, so that the opening size of the fan-shaped groove gradually decreases from top to bottom. In this way, on the one hand, the smaller lower opening can reduce the impact on the structure of the sealing element 20, and on the other hand, the larger upper opening can increase the material capacity, thereby increasing the amount of material collected, which helps the first collecting groove 21 to continuously play the role of stress relief. Similarly, the specific structural form of the diversion groove 24 can also be set as needed, and in this embodiment, the diversion groove 24 also adopts a triangular groove.

[0054] Example 2

[0055] The difference from Embodiment 1 is that the arrangement of the first flow collection channel 21 is different.

[0056] like Figure 9 and Figure 10 As shown, in this embodiment, multiple first collecting channels 21 are provided, and the first collecting channels 21 are spaced apart along the circumference of the seal 20 on the first plane segment 26, so that the first plane segment 26 forms discontinuous first collecting channels 21 in the circumference. In this way, the first collecting channels 21 are not interconnected with each other. The specific setting position of the first collecting channels 21 can be set according to the welding point 25. Preferably, each first collecting channel 21 can cover at least one welding point 25. The non-connection distance between each first collecting channel 21 can be set as needed, so that each first collecting channel 21 independently plays the role of collecting materials without affecting each other. This avoids the problem that excessive material in some welding points 25 will lead to excessive material in the entire first collecting channel 21, which will affect the material collection of other welding points 25.

[0057] In addition to the circumferentially spaced arrangement of the first collecting grooves 21, the first collecting grooves 21 can also be arranged radially. That is, the first collecting grooves 21 can be arranged in multiple rings radially to the seal 20. Each ring of the first collecting grooves 21 can be arranged in the form of an annular groove as in Embodiment 1, or in the form of circumferential spacing as described above. In this way, the first collecting grooves 21 are divided into inner and outer rings. When there is more material in the outer ring of the first collecting grooves 21, the material can flow into the inner ring of the first collecting grooves 21, thereby increasing the holding capacity of the first collecting grooves 21. Considering that the first collecting channel 21 is set on the first plane segment 26, the material flow between the inner and outer first collecting channels 21 is worse than the flow in the guide channel 24. Therefore, a radial connecting channel can be set between two adjacent first collecting channels 21 in the inner and outer circles. The connecting channel realizes the connection between the inner and outer first collecting channels 21, so that the material in the outer first collecting channel 21 can flow more easily into the inner first collecting channel 21, and then flow from the innermost first collecting channel 21 into the second collecting channel 22 through the guide channel 24.

[0058] It should be noted that "multiple" in the above embodiments refers to at least two.

[0059] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0060] 1. This solves the problem of easy cracking during welding of battery sealing sheets in existing technologies;

[0061] 2. The material can flow into the first collection tank during welding, thereby alleviating the stress problem at the weld joint;

[0062] 3. Avoid excessive material buildup in the first flow collector, which could lead to new stress concentrations and ensure a stable welding process and reliable welding quality;

[0063] 4. The design of the first and second flow collectors can reduce the amount of material used in the seals and lower production costs.

[0064] Obviously, the embodiments described above are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort should fall within the scope of protection of this application.

[0065] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0066] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery top cover, characterized in that, include: Top cover body (10), the top cover body (10) having a through hole; A sealing element (20) is sealed and connected to the through hole and blocks the through hole. The sealing element (20) has a first collecting groove (21) near the edge of the sealing connection part. The sealing element (20) also has a second collecting groove (22), which is located inside the first collecting groove (21) and communicates with the first collecting groove (21).

2. The battery top cover according to claim 1, characterized in that, The central region of the seal (20) has a recess (23), the first collecting groove (21) and the second collecting groove (22) are located at different heights of the recess (23), and the height of the first collecting groove (21) is higher than the height of the second collecting groove (22).

3. The battery top cover according to claim 2, characterized in that, The first collecting groove (21) is located on the upper surface of the top edge of the recess (23), and the second collecting groove (22) is located on the bottom surface of the recess (23).

4. The battery top cover according to claim 3, characterized in that, The bottom surface area of ​​the recess (23) is S0, and the total area of ​​all the second collection channels (22) is S, where S / S0 < 80%.

5. The battery top cover according to claim 1, characterized in that, The first collecting groove (21) extends circumferentially along the seal (20), wherein, The first collecting groove (21) is continuously arranged along the circumference of the seal (20) and forms an annular groove; or There are multiple first collecting channels (21), and each first collecting channel (21) is arranged at intervals along the circumference of the sealing member (20); or Claim PN280433HZYWDL states that there are multiple first collection grooves (21), and each first collection groove (21) is arranged at a radial distance along the seal (20).

6. The battery top cover according to any one of claims 1 to 5, characterized in that, The sealing element (20) further includes a drainage groove (24), the two ends of which are connected to the first collection groove (21) and the second collection groove (22) respectively. The first collection groove (21) is connected to the second collection groove (22) through the drainage groove (24).

7. The battery top cover according to claim 6, characterized in that, The second collecting channel (22) and the diverting channel (24) are both one; or There is one second collecting channel (22) and multiple diversion channels (24). Each diversion channel (24) is connected to a different position of the first collecting channel (21) and is also connected to the same second collecting channel (22); or There are multiple second collection channels (22) and multiple diversion channels (24). Each second collection channel (22) is connected to the first collection channel (21) through each diversion channel (24), and each diversion channel (24) is connected to a different position of the first collection channel (21).

8. The battery top cover according to claim 6, characterized in that, The drainage channel (24) includes a first side (241) and a second side (242) that extend along the length direction and are arranged opposite to each other, with an included angle between the first side (241) and the second side (242).

9. The battery top cover according to claim 8, characterized in that, Along the flow direction from the first collecting channel (21) to the second collecting channel (22), the distance between the first side (241) and the second side (242) gradually decreases.

10. The battery top cover according to claim 8, characterized in that, The sum of the included angles of all the drainage channels (24) is less than or equal to 180°.

11. The battery top cover according to any one of claims 1 to 5, characterized in that, The sealing element (20) has a welding point (25) at its circumferential outer edge for welding to the top cover body (10), and a first distance greater than 0 is formed between the first collection groove (21) and the welding point (25).

12. A battery, characterized in that, Includes the battery top cover according to any one of claims 1 to 11.

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