Battery cover plate and battery

Abstract

The utility model relates to the field of battery, disclose battery cover plate and battery. Battery cover plate, include: board body, are equipped with through -hole, fixed block, are equipped with the surface of board body and with through -hole opposite, pole, including the first shaft section, second shaft section and third shaft section that cross section reduces gradually, first shaft section interval setting is in the one side of board body away from fixed block, third shaft section passes through through -hole and links together with fixed block, second shaft section interval setting with fixed block, sealing element, including first sealing part and second sealing part, first sealing part sets up between first shaft section and board body, second sealing part sets up between second shaft section and fixed block and / or between fixed block and board body. Through first sealing part, second sealing part respectively to the cooperation area of pole and board body, pole and fixed block form double seal, compared with single seal structure, the sealing protection is more comprehensive.

Description

Technical Field

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

[0002] In secondary batteries, the battery cover is a core component for battery sealing and electrode lead-out; its sealing performance directly determines the battery's reliability and lifespan. Within the battery cover, the terminals, as key channels for current conduction, are typically fitted with sealing rings to achieve a sealing function.

[0003] However, the terminals in related technologies usually only have a single sealing ring. Although this meets the basic sealing requirements, the reliability is low. For example, under complex conditions such as long-term battery charge and discharge cycles, high-temperature operation, or vibration and shock, the seal is prone to failure or deterioration of sealing performance due to material aging, differences in thermal expansion coefficients, or stress concentration. Utility Model Content

[0004] In view of this, the present invention provides a battery cover and a battery to solve or improve the problem of low reliability of sealing rings in related technologies.

[0005] In a first aspect, this utility model provides a battery cover, comprising: The plate body has through holes; A fixing block is disposed on the surface of the plate and opposite to the through hole; The pole includes a first shaft segment, a second shaft segment, and a third shaft segment with sequentially decreasing cross-sections. The first shaft segment is spaced apart on the side of the plate away from the fixing block. The third shaft segment passes through the through hole and is connected to the fixing block. The second shaft segment is spaced apart from the fixing block. The sealing element includes a first sealing portion and a second sealing portion, wherein the first sealing portion is disposed between the first shaft segment and the plate body, and the second sealing portion is disposed between the second shaft segment and the fixing block and / or between the fixing block and the plate body.

[0006] In one alternative embodiment, the second sealing portion includes a first sub-part and a second sub-part connected to each other, the first sub-part being disposed between the second shaft segment and the fixing block, and the second sub-part being disposed between the plate body and the fixing block.

[0007] In one alternative embodiment, the second sub-part is disposed on the side of the first sub-part away from the pole post, and a receiving groove is formed between the second sub-part and the first sealing part, and the plate is engaged in the receiving groove.

[0008] In one alternative implementation, at least when not in contact with the fixing block, the end face of the second sub-part near the fixing block extends beyond the end face of the first sub-part near the fixing block.

[0009] In one alternative embodiment, the second sub-part is connected to the end face of the first sub-part near the fixing block. Under the squeezing action of the fixing block, the second sub-part can be folded towards the side of the first sub-part away from the pole post and enter between the fixing block and the plate.

[0010] In one optional embodiment, the first sub-part has a connecting portion at one end near the first sealing part, the connecting portion being connected to the first sealing part, wherein: At least one of the connecting part and the first sub-part has a groove on the side wall away from the pole post; And / or, the connecting portion has a first profile on the side wall away from the pole post, the first profile intersects with the first sealing portion, and along the direction from the first sealing portion to the second sealing portion, the first profile is inclined to the side of the connecting portion closer to the pole post.

[0011] In one optional embodiment, the second sub-part has a third profile on its side wall near the pole post, and at least when the second sub-part is not in contact with the fixing block, the third profile is inclined away from the pole post in the direction from the first sealing part to the second sealing part. And / or, the second sub-part has a second profile on the side wall away from the pole post, and at least when the second sub-part is not in contact with the fixing block, the second profile is inclined toward the pole post in the direction from the first sealing part to the second sealing part; And / or, the sidewall of the first sub-part near the pole post is curved, and the curved surface protrudes in the direction of approaching the pole post.

[0012] In one alternative embodiment, the first shaft segment includes an abutting portion and a base plate portion connected to each other, the abutting portion abutting against the first sealing portion, and the base plate portion being used to connect a tab.

[0013] In one alternative embodiment, the first sealing portion and the second sealing portion are connected to each other; And / or, the first sealing part has a protrusion on the side wall away from the pole post, and the protrusion abuts against the first shaft segment. The battery cover also includes a first insulating member connected to the side of the plate away from the fixing block, and has a clearance opening for the pole post to pass through. The inner wall of the clearance opening has a mating part, and the mating part is stacked with the protrusion.

[0014] In one alternative embodiment, the first sealing portion and the second sealing portion are integrally formed.

[0015] Secondly, this utility model also provides a battery, including the battery cover plate as described above.

[0016] Thirdly, this utility model also provides a battery device, including the battery described above.

[0017] Fourthly, this utility model also provides an electrical device, including the battery device described above, which is used to supply power.

[0018] The battery cover provided by this utility model has a first sealing part sandwiched between the first shaft segment and the plate body to form a sealing structure, and a second sealing part sandwiched between the fixing block and the second shaft segment and / or between the fixing block and the plate body to form another sealing structure.

[0019] This design creates a double seal between the pole and the plate, and between the pole and the fixing block, through the first and second sealing parts, providing more comprehensive sealing protection compared to a single sealing structure. Furthermore, the stepped structure of the pole adapts to different sealing parts, allowing the sealing parts to precisely correspond to the mating clearances of different shaft segments and components, improving the sealing fit.

[0020] At the same time, even if one seal fails, the other seal can maintain the sealing state, thereby improving the reliability of the battery cover seal.

[0021] The battery provided by this utility model, since it includes the battery cover of this utility model, also includes all the above-mentioned advantages of the battery cover. Attached Figure Description

[0022] 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.

[0023] Figure 1 An exploded view of the battery cover provided in an embodiment of this utility model; Figure 2 A cross-sectional view of a battery cover provided for an embodiment of this utility model; Figure 3 for Figure 2 A magnified view of part A in the diagram; Figure 4 for Figure 3 A schematic diagram of the structure of the sealing element in the diagram; Figure 5 A cross-sectional view of another battery cover provided in an embodiment of this utility model; Figure 6 for Figure 5 A magnified view of part B in the diagram; Figure 7 for Figure 6 A schematic diagram of the structure of the sealing element in the diagram; Figure 8 This is a schematic diagram of another sealing element provided in an embodiment of the present utility model; Figure 9 This is a schematic diagram of the structure of another sealing element provided in an embodiment of the present utility model; Figure 10 This is a structural schematic diagram of another sealing element provided in an embodiment of the present utility model.

[0024] Explanation of reference numerals in the attached figures: 1. Plate body; 101. Through hole; 2. Fixing block; 3. Pole post; 301. First shaft segment; 3011. Abutment portion; 3012. Base plate portion; 302. Second shaft segment; 303. Third shaft segment; 4. Sealing element; 401. First sealing part; 4011. Protrusion; 402. Second sealing part; 4021. First sub-part; 4022. Second sub-part; 4023. Connecting part; 4024. Groove; 4025. First profile; 4026. Second profile; 4027. Third profile; 4028. Curved surface; 403. Receiving groove; 5. First insulating component; 501. Limiting protrusion; 502. Mating part; 6. Second insulating component. Detailed Implementation

[0025] 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.

[0026] In related technologies, the terminal post usually has only a single sealing ring. Although it meets the basic sealing requirements, its reliability is low. For example, under complex working conditions such as long-term battery charge and discharge cycles, high-temperature operation, or vibration and shock, the seal is prone to failure or deterioration of sealing performance due to material aging, differences in thermal expansion coefficients, or stress concentration.

[0027] In order to solve or improve the problem of low reliability of sealing rings in related technologies, this utility model provides a battery cover and a battery.

[0028] The following is combined with Figures 1 to 10 This describes the battery cover provided in an embodiment of the present invention.

[0029] Specifically, the battery cover includes a plate 1, a fixing block 2, a terminal post 3, and a sealing element 4.

[0030] The plate 1 is provided with through holes 101. Optionally, there are two through holes 101, and the positive electrode post and the negative electrode post pass through the two through holes 101 respectively.

[0031] The fixing block 2 is disposed on the surface of the plate 1 and is opposite to the through hole 101. Accordingly, there are two fixing blocks 2, which correspond to the two through holes 101 respectively, and serve as the positive electrode fixing block and the negative electrode fixing block respectively.

[0032] The pole post 3 includes a first shaft segment 301, a second shaft segment 302, and a third shaft segment 303, whose cross-sections decrease sequentially.

[0033] The first shaft segment 301 is disposed on the side of the plate 1 away from the fixing block 2, and the first shaft segment 301 is spaced apart from the plate 1, that is, there is a first preset gap between the end face of the first shaft segment 301 near the second shaft segment 302 and the plate 1.

[0034] The third shaft segment 303 passes through the through hole 101 and is connected to the fixing block 2, for example, by welding the two together. The second shaft segment 302 is spaced apart from the fixing block 2. For example, the second shaft segment 302 also passes through the through hole 101, and there is a second preset gap between the end face of the second shaft segment 302 facing away from the first shaft segment 301 and the fixing block 2.

[0035] Optionally, there are two pole posts 3, one of which is a positive pole post and the other is a negative pole post, and the two pole posts 3 are respectively disposed in the corresponding through holes 101.

[0036] The sealing element 4 includes a first sealing portion 401 and a second sealing portion 402. The first sealing portion 401 is disposed between the first shaft segment 301 and the plate 1, i.e., the first sealing portion 401 is disposed within a first preset gap. Optionally, the first sealing portion 401 is annular and surrounds the outer periphery of the second shaft segment 302.

[0037] The second sealing part 402 is disposed between the second shaft segment 302 and the fixing block 2 and / or between the fixing block 2 and the plate 1, that is, the second sealing part 402 is disposed within the second preset gap between the second shaft segment 302 and the fixing block 2, or the second sealing part 402 is disposed between the fixing block 2 and the plate 1. Alternatively, the second sealing part 402 is disposed both within the second preset gap between the second shaft segment 302 and the fixing block 2 and between the fixing block 2 and the plate 1.

[0038] Optionally, the second sealing part 402 is annular and is disposed around the outer periphery of the third shaft segment 303.

[0039] In this embodiment, the first sealing part 401 is sandwiched between the first shaft segment 301 and the plate 1 to form a sealing structure, and the second sealing part 402 is sandwiched between the fixing block 2 and the second shaft segment 302 and / or between the fixing block 2 and the plate 1 to form another sealing structure.

[0040] This configuration, through the first sealing part 401 and the second sealing part 402, forms a double seal for the mating areas of the pole post 3 and the plate 1, and the pole post 3 and the fixing block 2, respectively. Compared with a single sealing structure, the sealing protection is more comprehensive. In addition, the stepped structure of the pole post 3 is adapted to different sealing parts, allowing the sealing parts to accurately correspond to the mating gaps of different shaft segments and components, thereby improving the sealing fit.

[0041] At the same time, even if one seal fails, the other seal can maintain the sealing state, thereby improving the reliability of the battery cover seal.

[0042] For example, refer to Figure 3 and Figure 6 When a gap is formed between the third shaft segment 303 and the fixed block 2, the electrolyte in the battery needs to pass through two seals to leak from between the terminal post 3 and the fixed block 2. Similarly, external impurities need to pass through two seals to enter the battery from between the terminal post 3 and the fixed block 2. Obviously, this can reduce the possibility of electrolyte leakage or impurities entering the battery.

[0043] In addition, the electrolyte inside the battery needs to pass through two seals before it can leak from between the fixing block 2 and the plate 1. Similarly, external impurities need to pass through two seals before they can enter the battery from between the fixing block 2 and the plate 1, making it less likely that the electrolyte will leak or impurities will enter the battery.

[0044] It should be noted that, since the positive and negative terminals have similar structures, for ease of explanation, unless otherwise specified, the structure of terminal 3 and fixing block 2 can be used for both positive and negative terminals.

[0045] Optionally, the cross-section of the pole post 3 can be circular, rectangular, or oblong, etc. Correspondingly, the cross-sectional shapes of the first shaft segment 301, the second shaft segment 302, and the third shaft segment 303 are determined according to the cross-sectional shape of the pole post 3. At the same time, the shapes of the sealing element 4 and the through hole 101 of the plate 1 are also determined according to the cross-sectional shape of the pole post 3. For example, when the cross-sectional shape of the pole post 3 is circular, the shapes of the sealing element 4 and the through hole 101 of the plate 1 are also circular.

[0046] refer to Figure 3 and Figure 6 As shown, in some embodiments provided by this utility model, the battery cover also includes a second insulating member 6.

[0047] The second insulating member 6 is arranged around the outer periphery of the fixing block 2, and the end of the second insulating member 6 near the plate 1 is provided with a flange. The flange is annular and is arranged between the fixing block 2 and the plate 1.

[0048] Furthermore, there is a gap between the inner ring wall of the flange and the hole wall of the through hole 101, so that a receiving space is formed between the inner ring wall of the flange and the hole wall of the through hole 101, into which the second sealing part 402 can extend. By providing the second insulating member 6, contact short circuit between the pole post 3 and the plate 1 can be prevented.

[0049] Optionally, a limiting groove is provided on the surface of the plate 1, and a flange is provided between the fixing block 2 and the bottom of the limiting groove. In this embodiment, the limiting groove can limit the position of the second insulating member 6 and the fixing block 2, so that their position relative to the plate 1 is accurate on the one hand, and the second insulating member 6 or the fixing block 2 can be prevented from lateral displacement relative to the plate 1 on the other hand, thereby ensuring the stability of the second insulating member 6 and the fixing block 2.

[0050] In some embodiments provided by this utility model, the first sealing part 401 and the second sealing part 402 are connected to each other.

[0051] In this embodiment, the first sealing part 401 and the second sealing part 402 are connected to each other, so that the sealing member 4 forms a strong integral structure, so that the first sealing part 401 and the second sealing part 402 can always maintain a stable relative position relationship, reduce the probability of the first sealing part 401 or the second sealing part 402 shifting during assembly or use, and improve the sealing reliability of the sealing member 4.

[0052] In addition, the first sealing part 401 and the second sealing part 402 are connected to each other, and the first sealing part 401 and the second sealing part 402 can be installed simultaneously during the installation process, thereby optimizing the assembly process and improving the assembly efficiency.

[0053] refer to Figures 3-10As shown, optionally, the second sealing portion 402 has a connecting portion 4023 at one end near the first sealing portion 401. The maximum wall thickness of the connecting portion 4023 is less than the maximum wall thickness of the first sealing portion 401, and the maximum wall thickness of the connecting portion 4023 is less than the maximum wall thickness of the second sealing portion 402. The connecting portion 4023 is connected to the first sealing portion 401. For example, the first sealing portion 401, the second sealing portion 402, and the connecting portion 4023 are integrally formed.

[0054] In some embodiments provided by this utility model, the sealing element 4 is a rubber part, and the first sealing part 401 and the second sealing part 402 are configured as an integrally formed structure.

[0055] In some embodiments provided by this utility model, the second sealing part 402 includes a first sub-part 4021 and a second sub-part 4022.

[0056] The first sub-part 4021 and the second sub-part 4022 are connected to each other. The first sub-part 4021 is located between the second shaft segment 302 and the fixing block 2, and the second sub-part 4022 is located between the plate 1 and the fixing block 2.

[0057] In this embodiment, the first sub-part 4021 can seal the gap between the second shaft segment 302 and the fixing block 2, and the second sub-part 4022 can seal the gap between the plate 1 and the fixing block 2, thereby covering two potential leakage points and improving sealing reliability. Furthermore, the first sub-part 4021 and the second sub-part 4022 can be independently designed for different fitting gaps, thereby ensuring a tighter seal and more uniform compression.

[0058] Of course, the first sealing part 401 and the second sealing part 402 can also be connected by means of bonding or vulcanization.

[0059] refer to Figure 3 and Figure 4 As shown, in some embodiments of this utility model, the second sub-part 4022 is disposed on the side of the first sub-part 4021 away from the pole post 3, that is, the second sub-part 4022 is disposed on the outer periphery of the first sub-part 4021. A receiving groove 403 is formed between the second sub-part 4022 and the first sealing part 401, and the plate 1 is engaged in the receiving groove 403. It can be understood that the sealing member 4 passes through the through hole 101, and the hole wall portion of the through hole 101 is disposed within the receiving groove 403.

[0060] In this embodiment, the second sub-part 4022 can cooperate with the receiving groove 403 formed by the first sealing part 401 on the outer periphery of the first sub-part 4021, and can wrap the plate 1 from multiple directions from the upper and lower surfaces of the plate 1 and the hole wall of the through hole 101, so that the connection between the sealing member 4 and the plate 1 is more firm, and the sealing member 4 is prevented from shifting or falling off due to long-term vibration or thermal expansion and contraction.

[0061] refer to Figure 3 As shown, in some embodiments provided by this utility model, at least in the state where it is not in contact with the fixing block 2, the end face of the second sub-part 4022 near the fixing block 2 extends beyond the end face of the first sub-part 4021 near the fixing block 2. It can be understood that when the second sub-part 4022 is in contact with the fixing block 2, it may still extend beyond the first sub-part 4021 due to the pressure from the fixing block 2, or it may be flush with the first sub-part 4021.

[0062] In this embodiment, reference is made to Figure 3 and Figure 4 As shown, the end face of the second sub-part 4022 extends beyond the first sub-part 4021. During the assembly process, the fixing block 2 presses the second sub-part 4022 downward, and the second shaft segment 302 presses the first sub-part 4021 upward, so that the second sealing part 402 forms a torque balance, ensuring that both the first sub-part 4021 and the second sub-part 4022 can be effectively pressed.

[0063] It is understood that the second sub-part 4022 is not limited to being disposed on the outer periphery of the first sub-part 4021, for example, referring to Figures 6-10 As shown, in some other embodiments provided by this utility model, the second sub-part 4022 is connected to the end face of the first sub-part 4021 near the fixing block 2. Furthermore, under the squeezing action of the fixing block 2, the second sub-part 4022 can fold towards the side of the first sub-part 4021 away from the pole post 3 and enter between the fixing block 2 and the plate 1.

[0064] In this embodiment, in the initial state, the second sub-part 4022 is not folded and is integrated into the end face of the first sub-part 4021. The overall structure of the seal 4 is more compact and the outline is more regular. There is no protruding outer peripheral extension. When passing through the through hole 101 of the plate body 1, it is not easy to get stuck or interfere with the hole wall.

[0065] For example, when assembling the seal 4, there is no need to excessively squeeze or deform the seal 4. The initial insertion can be completed simply by pushing the seal 4 along the axis of the through hole 101, which can reduce the assembly difficulty of the seal 4 and facilitate automated assembly.

[0066] Correspondingly, after the second sub-part 4022 is folded towards the side of the first sub-part 4021 away from the pole post 3, a receiving groove 403 can also be formed between the second sub-part 4022 and the first sealing part 401. It can be understood that the hole wall portion of the through hole 101 is provided in the receiving groove 403.

[0067] In this embodiment, the receiving groove 403 formed by the second sub-part 4022 in conjunction with the first sealing part 401 can wrap the plate 1 from multiple directions from the upper and lower surfaces of the plate 1 and the wall of the through hole 101, making the connection between the seal 4 and the plate 1 more secure and avoiding displacement or detachment of the seal 4 due to long-term vibration or thermal expansion and contraction.

[0068] refer to Figures 6-10 As shown, in some embodiments of this utility model, a connecting portion 4023 is provided at one end of the first sub-part 4021 near the first sealing portion 401. The connecting portion 4023 is connected to the first sealing portion 401, that is, the connecting portion 4023 and the second sub-part 4022 are distributed at both ends of the first sub-part 4021. Optionally, the maximum wall thickness of the connecting portion 4023 is less than the maximum wall thickness of the first sub-part 4021, and the maximum wall thickness of the connecting portion 4023 is less than the maximum wall thickness of the first sealing portion 401.

[0069] Further, refer to Figures 6-10 As shown, at least one of the connecting portion 4023 and the first sub-portion 4021 has a groove 4024 on its side wall away from the pole post 3. Optionally, referring to... Figure 7 and Figure 10 As shown, the outer peripheral wall of the first sub-part 4021 is provided with a groove 4024. For example, the groove 4024 is provided in the portion of the first sub-part 4021 near the second sub-part 4022. Alternatively, refer to... Figure 8 As shown, the outer peripheral wall of the connecting part 4023 is provided with a groove 4024. For example, the groove 4024 is provided in the part of the connecting part 4023 near the first sealing part 401.

[0070] In this embodiment, the presence of the groove 4024 can increase the local flexibility of the seal 4, so that when the seal 4 is squeezed by the fixing block 2, it can fit more closely to the complex interface between the pole post 3, the fixing block 2 and the plate 1, thereby improving the sealing fit and sealing reliability.

[0071] In addition, when the second sub-part 4022 is folded or the seal 4 is deformed due to thermal expansion and contraction, the groove 4024 can provide reserved space for the deformation of the seal 4, preventing the seal 4 from being excessively squeezed or torn.

[0072] Optionally, such as Figure 7 As shown, groove 4024 is set as a V-groove, or as... Figure 8 and Figure 10 As shown, groove 4024 is configured as an arc-shaped groove.

[0073] Optionally, refer to Figure 9 and Figure 10 As shown, the connecting part 4023 has a first profile 4025 on the side wall away from the pole post 3. The first profile 4025 intersects with the first sealing part 401, and along the direction from the first sealing part 401 to the second sealing part 402, the first profile 4025 is inclined toward the side of the connecting part 4023 closer to the pole post 3.

[0074] In this embodiment, during the assembly of the seal 4, for example when the fixing block 2 presses and folds the second sub-part 4022, the inclined first profile 4025 can provide a clear deformation guide for the seal 4. For example, when the connecting part 4023 is under force, the material is more likely to shrink or extend inward toward the pole post 3 along the inclined direction, avoiding local accumulation or tearing caused by disordered deformation, and ensuring the stability of the sealing structure.

[0075] refer to Figures 8-10 As shown, in some embodiments of this utility model, the second sub-part 4022 has a second profile 4026 on its side wall away from the pole post 3, that is, the outer peripheral wall of the second sub-part 4022 has a second profile 4026. And at least when the second sub-part 4022 is not connected to the fixing block 2, the second profile 4026 is inclined towards the pole post 3 along the direction from the first sealing part 401 to the second sealing part 402. Further, the second profile 4026 intersects with the end face of the second sub-part 4022 away from the first sealing part 401.

[0076] In this embodiment, the second surface 4026 is inclined toward the pole post 3, which can reduce the outer peripheral size and wall thickness of the second sub-part 4022 away from the first sealing part 401. This helps guide the second sub-part 4022 to pass smoothly through the through hole 101 of the plate body 1 and into the gap between the fixing block 2 and the plate body 1, thereby reducing possible obstruction or jamming during assembly.

[0077] refer to Figures 8-10 As shown, in some embodiments provided by this utility model, the second sub-part 4022 has a third profile 4027 on its side wall near the pole post 3, that is, the inner peripheral wall of the second sub-part 4022 has a third profile 4027. And at least when the second sub-part 4022 is not attached to the fixing block 2, the third profile 4027 is inclined away from the pole post 3 in the direction from the first sealing part 401 to the second sealing part 402.

[0078] In this embodiment, by providing an inclined third profile 4027 on the inner peripheral wall of the second sub-part 4022, when the fixing block 2 abuts against the third profile 4027 during the assembly process, the second sub-part 4022 can be better folded outward to ensure that the second sub-part 4022 can enter between the plate 1 and the fixing block 2.

[0079] In addition, the third surface 4027 is inclined in the direction away from the pole post 3, which can reduce the wall thickness of the second sub-part 4022 away from the first sealing part 401, and help guide the second sub-part 4022 to smoothly enter the gap between the fixing block 2 and the plate 1, thereby reducing the possible obstruction or jamming during the assembly process.

[0080] It is understood that, for the case where the second sub-part 4022 is disposed on the end face of the first sub-part 4021, the features in the corresponding embodiments described above can be combined with each other. For example, in some embodiments, the second sub-part 4022 has a second profile 4026 on the side wall away from the pole post 3, and the second profile 4026 is inclined towards the pole post 3 along the direction from the first sealing part 401 to the second sealing part 402. The second sub-part 4022 has a third profile 4027 on the side wall near the pole post 3, and the third profile 4027 is inclined away from the pole post 3 along the direction from the first sealing part 401 to the second sealing part 402.

[0081] Furthermore, the outer peripheral wall of the first sub-part 4021 is provided with a groove 4024. Alternatively, the first sub-part 4021 is provided with a connecting part 4023 at one end near the first sealing part 401, the connecting part 4023 is connected to the first sealing part 401, and the outer peripheral wall of the connecting part 4023 is provided with a groove 4024, the groove 4024 being provided in the portion of the connecting part 4023 near the first sealing part 401. The outer peripheral wall of the connecting part 4023 is provided with a first profile 4025, which, along the direction from the first sealing part 401 to the second sealing part 402, is inclined towards the side of the connecting part 4023 near the pole post 3; for example, the first profile 4025 is provided with a groove 4024.

[0082] In this embodiment, the groove 4024 in the first sub-part 4021 and the groove 4024 in the connecting part 4023 can weaken the strength of the first sealing part 401, thereby allowing the second sub-part 4022 to fold and fill between the fixing block 2 and the plate 1 better under the combined guiding action of the first surface 4025, the second surface 4026 and the third surface 4027.

[0083] In some embodiments provided by this utility model, the sidewall of the first sub-part 4021 near the pole post 3 is a curved surface 4028, and the curved surface 4028 protrudes in the direction close to the pole post 3. For example, the curved surface 4028 can disperse and transmit the radial force generated by the vibration and thermal expansion and contraction of the pole post 3 along the curvature of the curved surface, avoiding stress concentration at local contact points that could cause premature wear or cracking of the seal 4, and significantly improving the fatigue resistance under long-term cyclic conditions.

[0084] In some embodiments provided by this utility model, the first shaft segment 301 includes an abutment portion 3011 and a substrate portion 3012.

[0085] The abutment portion 3011 and the substrate portion 3012 are connected to each other. The abutment portion 3011 abuts against the first sealing portion 401, and the substrate portion 3012 is used to connect the electrode tab. It is understood that the abutment portion 3011 can be welded to the substrate portion 3012, or the abutment portion 3011 and the substrate portion 3012 can be configured as an integral molding structure, such as sheet metal integral molding, machining integral molding, or forging integral molding.

[0086] In this embodiment, the abutting portion 3011 is specifically designed to abut against the first sealing portion 401. The shape of the abutting portion 3011 can be specifically designed to fit the first sealing portion 401. For example, in this embodiment, the abutting portion 3011 protrudes from the surface of the substrate portion 3012. This ensures that the compressive pressure on the first sealing portion 401 is evenly distributed, avoiding uneven force on the sealing portion and the appearance of gaps.

[0087] In addition, the substrate 3012 serves as a dedicated area for electrode connection, and its structure can be optimized according to the connection methods such as welding and riveting of the electrode to ensure stable electrical connection between the electrode and the electrode post 3 and reduce contact resistance.

[0088] In some embodiments provided by this utility model, the first sealing part 401 has a protrusion 4011 on the side wall opposite to the pole post 3, that is, the outer peripheral wall of the first sealing part 401 has a protrusion 4011. Specifically, the protrusion 4011 abuts against the first shaft segment 301. For example, the end face of the protrusion 4011 near the first shaft segment 301 is flush with the end face of the first sealing part 401.

[0089] Furthermore, the battery cover also includes a first insulating member 5. The first insulating member 5 is connected to the side of the plate 1 away from the fixing block 2, and the first insulating member 5 is provided with a clearance opening for the terminal post 3 to pass through. The inner wall of the clearance opening is provided with a mating part 502, and the mating part 502 is stacked with the protrusion 4011. For example, the protrusion 4011 is stacked on the side of the mating part 502 away from the plate 1.

[0090] In this embodiment, the protrusion 4011 and the mating part 502 are stacked, which can block the direct conductive path between the electrode post 3 and the plate 1, and prevent the electrode post 3 from making conductive contact with the plate 1 through the clearance or from becoming conductive through the electrolyte. In addition, it can further block the path of electrolyte leakage from the outer periphery of the electrode post 3 to the outside of the plate 1, forming an additional sealing barrier.

[0091] In some embodiments provided by this utility model, the surface of the first insulating member 5 away from the plate body 1 is provided with a limiting protrusion 501, the limiting protrusion 501 abuts against the first shaft segment 301, specifically, the limiting protrusion 501 abuts against the substrate portion 3012.

[0092] In this embodiment, by the limiting protrusion abutting against the first shaft segment 301, the compression stroke of the first shaft segment 301 against the first sealing part 401 is reduced, ensuring that the compression amount is always in the optimal sealing range, preventing excessive compression, thereby reducing the risk of fatigue, hardening or cracking of the sealing material due to long-term overload, and improving the durability of the seal 4 throughout the battery's entire life cycle.

[0093] In some embodiments provided by this utility model, the third shaft segment 303 includes a first sub-segment and a second sub-segment, and the cross-sections of the first sub-segment and the second sub-segment decrease sequentially along the direction away from the second shaft segment 302. The second sub-segment extends into the connecting hole and is welded to the hole wall of the connecting hole. Correspondingly, the second sealing part 402 is sleeved around the outside of the first sub-segment. Further, a countersunk hole is provided at the end of the connecting hole near the second shaft segment 302, and the end of the first sub-segment near the second segment extends into the countersunk hole.

[0094] In this embodiment, by making the cross-section of the first segment larger than that of the second segment, when the second sealing part 402 is fitted onto the outside of the first segment, it can be offset from the gap between the second segment and the connecting hole, thus avoiding the problem of welding heat directly hitting the second sealing part 402 and causing damage to the second sealing part 402.

[0095] This utility model also provides a battery.

[0096] Specifically, the battery is shown in the image above.

[0097] It should be noted that the battery includes the battery cover, and therefore also includes all the advantages of the battery cover mentioned above, so this will not be elaborated further.

[0098] 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 cover, characterized in that, include: The plate (1) is provided with a through hole (101); A fixing block (2) is provided on the surface of the plate (1) and is opposite to the through hole (101); The pole post (3) includes a first shaft segment (301), a second shaft segment (302) and a third shaft segment (303) with the cross-section decreasing sequentially. The first shaft segment (301) is spaced apart on the side of the plate (1) away from the fixing block (2). The third shaft segment (303) passes through the through hole (101) and is connected to the fixing block (2). The second shaft segment (302) is spaced apart from the fixing block (2). The sealing element (4) includes a first sealing part (401) and a second sealing part (402). The first sealing part (401) is disposed between the first shaft segment (301) and the plate body (1), and the second sealing part (402) is disposed between the second shaft segment (302) and the fixing block (2) and / or between the fixing block (2) and the plate body (1).

2. The battery cover according to claim 1, characterized in that, The second sealing part (402) includes a first sub-part (4021) and a second sub-part (4022) connected to each other. The first sub-part (4021) is disposed between the second shaft segment (302) and the fixing block (2), and the second sub-part (4022) is disposed between the plate (1) and the fixing block (2).

3. The battery cover according to claim 2, characterized in that, The second sub-part (4022) is located on the side of the first sub-part (4021) away from the pole post (3), and a receiving groove (403) is formed between the second sub-part (4022) and the first sealing part (401), and the plate (1) is engaged in the receiving groove (403).

4. The battery cover according to claim 3, characterized in that, At least in the state where it is not in contact with the fixing block (2), the end face of the second sub-part (4022) near the fixing block (2) extends beyond the end face of the first sub-part (4021) near the fixing block (2).

5. The battery cover according to claim 2, characterized in that, The second sub-part (4022) is connected to the end face of the first sub-part (4021) near the fixing block (2). Under the squeezing action of the fixing block (2), the second sub-part (4022) can be folded to the side of the first sub-part (4021) away from the pole post (3) and enter between the fixing block (2) and the plate (1).

6. The battery cover according to claim 5, characterized in that, The first sub-part (4021) has a connecting part (4023) at one end near the first sealing part (401), and the connecting part (4023) is connected to the first sealing part (401), wherein: At least one of the connecting part (4023) and the first sub-part (4021) has a groove (4024) on its side wall away from the pole post (3). And / or, the connecting part (4023) is provided with a first profile (4025) on the side wall away from the pole post (3), the first profile (4025) intersects with the first sealing part (401), and along the direction from the first sealing part (401) to the second sealing part (402), the first profile (4025) is inclined toward the side of the connecting part (4023) closer to the pole post (3).

7. The battery cover according to claim 5, characterized in that, The second sub-part (4022) has a third profile (4027) on its side wall near the pole post (3), and at least when the second sub-part (4022) is not in contact with the fixing block (2), the third profile (4027) is inclined in the direction away from the pole post (3) along the direction from the first sealing part (401) to the second sealing part (402); And / or, the second sub-part (4022) has a second profile (4026) on the side wall away from the pole post (3), and at least when the second sub-part (4022) is not in contact with the fixing block (2), the second profile (4026) is inclined toward the pole post (3) in the direction from the first sealing part (401) to the second sealing part (402); And / or, the sidewall of the first sub-part (4021) near the pole post (3) is a curved surface (4028), and the curved surface (4028) protrudes in the direction of the pole post (3).

8. The battery cover according to claim 1, characterized in that, The first shaft segment (301) includes an abutting portion (3011) and a base plate portion (3012) connected to each other. The abutting portion (3011) abuts against the first sealing portion (401), and the base plate portion (3012) is used to connect the electrode tab.

9. The battery cover according to claim 1, characterized in that, The first sealing part (401) and the second sealing part (402) are connected to each other; And / or, the first sealing part (401) has a protrusion (4011) on the side wall away from the pole post (3), and the protrusion (4011) abuts against the first shaft segment (301). The battery cover also includes a first insulating member (5), which is connected to the side of the plate body (1) away from the fixing block (2) and has a clearance opening for the pole post (3) to pass through. The inner wall of the clearance opening is provided with a mating part (502), and the mating part (502) and the protrusion (4011) are stacked.

10. The battery cover according to claim 9, characterized in that, The first sealing part (401) and the second sealing part (402) are integrally formed.

11. A battery, characterized in that, Includes the battery cover as described in any one of claims 1-10.

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