Cover member, secondary battery, battery pack, and electronic appliance

Abstract

To provide a cover member whose hermetic seal performance can be secured, and a secondary battery, a battery pack, and an electronic appliance using the cover member.SOLUTION: A cover member according to the present invention includes a cover main body where a post attachment hole is provided, an electrode terminal including a bottom plate provided on one side of the cover main body and a post provided at the bottom plate, penetrating the post attachment hole at least partially, and extending along a thickness direction of the cover main body to the other side of the cover main body, and a seal ring fitted to the post and disposed at least partially between the cover main body and the bottom plate. At least one of the electrode terminal and the seal ring includes a position restricting structure that restricts the displacement of the seal ring in the thickness direction of the cover main body. Thus, the hermetic seal performance of the cover member, and a secondary battery and a battery pack using the cover member can be secured.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention belongs to the technical field of power batteries, and particularly relates to a cover member used for a secondary battery casing, a secondary battery using the cover member, a battery pack including the secondary battery, and an electronic device including the battery pack. [Background technology]

[0002] Existing power batteries are classified into prismatic, cylindrical, and soft-pack batteries depending on the packaging type. Prismatic batteries include a metal casing and a prismatic battery core built into the casing, and the prismatic battery core usually consists of a casing, a top cover, and electrode members.

[0003] Prior art CN213716966U discloses a top cover structure for a prismatic battery core, which includes a cover with positive and negative column mounting holes, and positive and negative columns that are attached to the positive and negative column mounting holes and are higher than the top surface of the cover by a predetermined height, with sealing rings fitted to the positive and negative columns. The sealing rings ensure that there is no air leakage from the positive and negative columns, improving the airtightness of the entire prismatic battery core.

[0004] In the above-mentioned prior art, if the seal rings are misaligned after being fitted to the positive electrode column and the negative electrode column, it will affect the sealing performance of the entire battery core. Summary of the Invention [Problem to be solved by the invention]

[0005] In response to the above-mentioned problems, the present invention provides a cover member and a secondary battery using the cover member, which can ensure the sealing performance of the cover member and the secondary battery using the cover member by compressing and sealing the seal ring according to a predetermined position. [Means for solving the problem]

[0006] The cover member provided by the present invention comprises a cover body provided with a post mounting hole, an electrode terminal having a bottom plate provided on one side of the cover body and a post provided on the bottom plate, at least a portion of which passes through the post mounting hole and extends along the thickness direction of the cover body to the other side of the cover body, and a seal ring fitted onto the post and at least a portion of which is positioned between the cover body and the bottom plate, and at least one of the electrode terminal and the seal ring is provided with a position limiting structure that limits displacement of the seal ring in the thickness direction of the cover body.

[0007] According to the technical solution of the present invention, the electrode terminal or the seal ring is provided with a position limiting structure, which can limit the displacement of the seal ring fitted on the post even if shaking or collision occurs in the subsequent process. Therefore, when the seal ring is compressed and sealed, the seal ring is limited to a predetermined position, ensuring the sealing performance of the cover member.

[0008] As a preferred technical solution, in the cover member provided by the present invention, the position limiting structure includes a limiting portion provided on the outer wall of the post, and a part of the sealing ring is provided between the limiting portion and the bottom plate.

[0009] According to this preferred technical solution, the limiting portion is provided on the outer wall of the post and can be integrally molded with the post, and the space between the bottom plate and the limiting portion is used to accommodate the sealing ring, thereby realizing the positional restriction of the sealing ring with a simple structure and ensuring the sealing performance of the cover member.

[0010] As a preferred technical solution, in the cover member provided by the present invention, at least a portion of the area of the sealing ring close to the outer wall of the sealing ring is disposed between the cover body and the bottom plate, and at least a portion of the area of the sealing ring close to the inner wall of the sealing ring is disposed between the limiting part and the bottom plate.

[0011] According to this preferred technical solution, a portion of the sealing ring near its outer wall is compressed between the cover body and the bottom plate, causing the sealing ring to undergo local compressive deformation, thereby realizing sealing of the cover member; at the same time, the limiting portion and the bottom plate contact and fix a portion of the sealing ring near its inner wall, thereby restricting displacement of the sealing ring and ensuring that the sealing ring is in a predetermined, ideal position when the cover body and the bottom plate compress the sealing ring, thereby ensuring the sealing performance of the cover member.

[0012] As a preferred technical solution, in the cover member provided by the present invention, the height of at least a part of the area of the sealing ring close to the inner wall of the sealing ring is higher than the height of at least a part of the area of the sealing ring close to the outer wall of the sealing ring, and the limiting portion abuts against the sealing ring.

[0013] According to the cover member of this preferred technical solution, the height of at least a portion of the sealing ring near its inner wall is higher than the height of at least a portion of the sealing ring near its outer wall, i.e., the height of the sealing ring after the cover body and the base plate come into contact and press (the height of the portion of the sealing ring near its outer wall) is lower than the height of the portion of the sealing ring where the limiting portion comes into contact and fixed with the base plate (the height of the portion of the sealing ring near its inner wall), i.e., the portion of the sealing ring that comes into contact and presses with the cover body and the base plate undergoes more compressive deformation to ensure the sealing performance of the cover member, while the portion of the sealing ring that comes into contact and fixed with the limiting portion does not require excessive compressive deformation and only needs to abut the limiting portion and be fixed to prevent misalignment, thereby ensuring the positional restriction of the sealing ring and the sealing effect of the cover member.

[0014] As a preferred technical solution, in the cover member provided by the present invention, the limiting portion includes a protrusion provided on the outer wall of the post, and at least a portion of the area of the sealing ring close to the inner wall of the sealing ring is accommodated in the accommodating space formed by the protrusion, part of the outer wall of the post, and the bottom plate; alternatively, the limiting portion includes a recess provided on the outer wall of the post, and at least a portion of the area of the sealing ring close to the inner wall of the sealing ring is accommodated in the accommodating space formed by the recess and the bottom plate.

[0015] According to the cover member of this preferred technical solution, the convex or concave portion on the outer wall of the post may be integrally molded with the post, and the accommodation space may be formed using the convex portion, part of the outer wall of the post and the bottom plate, or the accommodation space may be formed using the concave portion and the bottom plate. This does not require any extra parts, and the positional restriction of the seal ring can be realized with a simple structure and low cost, thereby ensuring the sealing performance of the cover member.

[0016] As a preferred technical solution, in the cover member provided by the present invention, the protrusion or recess is provided on the outer wall of the post so as to surround the outer wall of the post.

[0017] According to the cover member of this preferred technical solution, the convex portion or concave portion corresponds to the annular seal ring and is provided on the outer wall of the post so as to surround the outer wall of the post, which can better fit with the part of the seal ring that is closer to the inner wall of the seal ring, thereby achieving stable and reliable positional restriction of the seal ring.

[0018] As a preferred technical solution, in the cover member provided by the present invention, the convex portion includes a plurality of protrusions arranged in an array on the outer wall of the post along the radial direction of the post, or the convex portion is a flange structure provided on the outer wall of the post so as to surround the outer wall of the post along the circumferential direction of the post.

[0019] According to the cover member of this preferred technical solution, the multiple protrusions arranged in an array on the outer wall of the post or the flange structure provided on the outer wall of the post do not require any extra parts, have a simple structure, are molded integrally with the post, and can realize positional restriction of the seal ring at low cost and ensure the sealing performance of the cover member.

[0020] As a preferred technical solution, in the cover member provided by the present invention, the first contact surface formed by the contact portion between the edge portion of the post mounting hole and the seal ring is closer to the bottom plate than the second contact surface formed by the contact portion between the limiting portion and the seal ring.

[0021] According to the cover member of this preferred technical solution, the first contact surface corresponding to the contact and compression between the cover body and the base plate is closer to the base plate than the second contact surface corresponding to the contact between the limiting portion and the seal ring, i.e., the seal ring portion of the first contact surface undergoes more compressive deformation to ensure the sealing performance of the cover member, while the seal ring portion of the second contact surface (the seal ring portion where the limiting portion and the base plate come into contact and are fixed) does not require excessive compressive deformation and only needs to abut against the limiting portion and be fixed so as not to cause displacement, thereby ensuring the positional restriction of the seal ring and the sealing effect of the cover member.

[0022] As a preferred technical solution, in the cover member provided by the present invention, the relationship between the thickness H1 of the cover body in the thickness direction of the part of the seal ring corresponding to the first contact surface and the thickness H2 of the cover body in the thickness direction of the part of the seal ring corresponding to the second contact surface is expressed by the formula: 0.2*H2

[0023] According to the cover member of this preferred technical solution, the formula: 0.2*H2

[0024] ​​As a preferred technical solution, in the cover member provided by the present invention, the relationship between the protruding height L1 of the convex portion protruding from the outer wall of the post or the recess depth L2 of the concave portion recessed from the outer wall of the post and the difference A between the inner and outer diameters of the sealing ring satisfies the formula: (1 / 10)A < L1 < (1 / 3)A or (1 / 10)A < L2 < (1 / 3)A.

[0025] According to the cover member of this preferred technical solution, if the difference A between the inner and outer diameters in the radial direction of the sealing ring, that is, the radial width of the sealing body, satisfies the formula: (1 / 10)A < L < (1 / 3)A, then the portion that is more than 1 / 10 and less than 1 / 3 of the radial width of the sealing body will abut against the convex portion or the concave portion to produce the effect of restricting the position and fixing the sealing ring, and in the direction perpendicular to the thickness of the cover, it combines the relationship between the compression ratio of the first contact surface that produces the sealing effect and the occupancy ratio of the second contact surface that produces the position restricting effect, and can achieve both good position restriction and ensuring compression sealing performance.

[0026] As a preferred technical solution, in the cover member provided by the present invention, the relationship between the width W in the thickness direction of the cover body of the accommodation space and the initial thickness D of the sealing ring when it is not originally compressed satisfies the formula: 0.7D < W < 0.95D.

[0027] According to the cover member of this preferred technical solution, a part of the sealing ring provided in the accommodation space will have a compression deformation rate in the thickness direction of the cover body of 70% or more and 95% or less compared to the initial thickness D when it is not originally compressed. With this numerical range, a part of the sealing ring provided in the accommodation space can be appropriately compressed and deformed and stably position-limited, and at the same time, it can avoid unnecessary influence on other parts of the sealing ring without being overly compressed.

[0028] As a preferred technical solution, in the cover member provided by the present invention, the position restricting structure is an adhesive layer provided on the contact surface between the sealing ring and the post.

[0029] According to the cover member of this preferred technical solution, the adhesive layer has a simple structure and low cost, and can be implemented without changing the shape of the outer wall of the existing post.

[0030] As a preferred technical solution, in the cover member provided by the present invention, an adhesive layer is pre-installed on the outer wall side of the post and adheres to the inner ring side of the sealing ring, or an adhesive layer is pre-installed on the bottom plate side and adheres to the bottom side of the sealing ring, or an adhesive layer is pre-installed on the side of the sealing ring closer to the bottom plate and adheres to the bottom plate, or an adhesive layer is pre-installed on the inner ring side of the sealing ring and adheres to the outer wall of the post.

[0031] According to the cover member of this preferred technical solution, the adhesive layer can be pre-installed at different positions. If the adhesive layer is pre-installed on the outer wall side of the post or on the side close to the bottom plate of the sealing ring, the sealing ring will only be adhesively fixed once it reaches the specified position during the process of fitting the sealing ring onto the post, so there will be no deviation in the adhesive position, and accurate positioning of the sealing ring can be ensured.

[0032] In another aspect, the present invention also provides a secondary battery including a housing having an upper opening, an electrode member placed on the housing through the upper opening, and a top cover that seals the upper opening, wherein the top cover is a cover member provided by any of the above technical solutions.

[0033] In another aspect, the present invention also provides a battery pack including a secondary battery provided by any of the above technical solutions.

[0034] The present invention also provides an electronic device equipped with a battery pack provided by any of the above technical solutions.

[0035] According to the secondary battery, battery pack, and electronic device provided by the present invention, the cover member used has good sealing performance, which ensures good sealing performance of the entire secondary battery and battery pack. [Effects of the Invention]

[0036] According to the technical solution of the present invention, a position limiting structure is provided on the electrode terminal or the seal ring, so that the seal ring fitted on the post can be prevented from being displaced even if it is shaken or hit in a subsequent process, etc. Therefore, when the seal ring is compressed and sealed, the seal ring is limited to a predetermined position, thereby ensuring the sealing performance of the cover member.

[0037] According to the secondary battery, battery pack, and electronic device provided by the present invention, the cover member used has good sealing performance, which ensures good sealing performance of the entire secondary battery and battery pack. [Brief explanation of the drawings]

[0038] [Figure 1] 1 is a schematic three-dimensional view of a top cover structure in the prior art; [Figure 2] FIG. 1 is a partial cross-sectional view of a top cover structure of the prior art. [Figure 3] 1 is an exploded view of a cover member provided according to a first embodiment of the present invention; [Figure 4] FIG. [Figure 5] 5 is a cross-sectional view taken along the line AA of the cover member shown in FIG. 4. [Figure 6] FIG. 6 is a partial enlarged view of part B shown in FIG. [Figure 7] FIG. [Figure 8] FIG. 2 is a schematic structural diagram of a post. [Figure 9] FIG. 7 is a partial enlarged view of a portion D shown in FIG. [Figure 10] FIG. 2 is a schematic diagram of a seal ring structure. [Figure 11] FIG. 6 is a partial schematic view of a cover member provided according to a second embodiment of the present invention. [Figure 12] FIG. 6 is a partial schematic view of a cover member provided according to a second embodiment of the present invention. [Figure 13] FIG. 6 is a partial schematic view of a cover member provided according to a second embodiment of the present invention. [Figure 14]FIG. 6 is a partial schematic view of a cover member provided according to a second embodiment of the present invention. [Figure 15] FIG. 10 is an exploded view of a secondary battery provided according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention, but the described embodiments are only some embodiments of the present invention, and are not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are included in the scope of protection of the present invention.

[0040] In the description of the present invention, terms indicating positional relationships such as "upper," "lower," "front," "rear," "left," and "right" are expressions based on reference to the illustrated direction or positional relationship or relative position, and are intended to facilitate a clearer understanding of the present invention for those skilled in the art. They are not intended to teach or suggest that a device or component has a specific orientation, or is constructed or operated in a specific orientation, and therefore cannot be construed as limiting the present invention.

[0041] 1 and 2 are schematic diagrams of the top cover structure in the prior art, in which the seal ring 19 is fitted to a position close to the rectangular bottom 121 of the column body 122 and cooperates with the lower positive electrode plastic plate 17 to achieve a tight seal.

[0042] After the seal rings 19 are mounted on the positive electrode column 12 and the negative electrode column 13, the positive electrode column 12 and the negative electrode column 13 are penetrated and attached to the cover plate 11 through the first via 171 and the second via 172, and then the subsequent process is carried out.

[0043] However, in the top cover structure of the prior art, when the seal rings 19 are mounted near the rectangular bottoms 121 of the positive electrode columns 12 and the negative electrode columns 13, the seal rings 19 are only temporarily fitted. During the subsequent process of attaching the positive electrode columns 12 and the negative electrode columns 13 to the cover 11 through the vias, or during other subsequent processes, the temporarily fitted seal rings 19 may fall off or move to an incorrect position due to a collision or shaking. This may result in an inappropriate compression position or an insufficient compression area when the cover 11 is compressed to seal the seal rings 19 in the subsequent process, resulting in problems affecting the sealing performance.

[0044] Therefore, in order to solve the problem that the seal ring 19 existing in the above-mentioned prior art may be displaced after being fitted to the positive electrode column 12 and the negative electrode column 13, an embodiment of the present invention proposes a new cover member.

[0045] First Embodiment Fig. 3 is a three-dimensional exploded view of a cover member provided according to a first embodiment of the present invention, Fig. 4 is a top view of the cover member, and Fig. 5 is a cross-sectional view taken along line A-A of the cover member shown in Fig. 4. Fig. 6 is a partially enlarged view of part B shown in Fig. 5.

[0046] As shown in Figures 3, 4, 5 and 6, the cover member 200 includes a cover body 201, an electrode terminal 202a, an electrode terminal 202b, a seal ring 203a, a seal ring 203b, and a limiting portion 204a (position limiting structure) and a limiting portion 204b (position limiting structure) provided on the electrode terminal 202a and the electrode terminal 202b, respectively.

[0047] The cover body 201 is provided with post mounting holes 2011 and 2012, and the electrode terminals 202a and 202b include bottom plates 2021a and 2021b, respectively, located on one side of the cover body 201, and posts 2022a and 2022b, respectively, located on the bottom plates 2021a and 2021b, with at least a portion of them passing through the post mounting holes 2011 and 2012 and extending along the thickness direction of the cover body 201 to the other side of the cover body 201.

[0048] The limiting portions 204a (position limiting structures) and 204b (position limiting structures) on the electrode terminals 202a and 202b are formed to protrude from the outer walls of the posts 2022a and 2022b, and the sealing rings 203a and 203b are fitted into the posts 2022a and 2022b, specifically, a portion of the sealing ring 203a (the inner portion of the sealing ring 203a) is positioned between the limiting portion 204a and the bottom plate 2021a, and a portion of the sealing ring 203b (the inner portion of the sealing ring 203b) is positioned between the limiting portion 204b and the bottom plate 2021b, so as to be fitted into the posts 2022a and 2022b.

[0049] When assembling the cover member 200, the seal rings 203a and 203b are fitted onto the posts 2022a and 2022b, respectively, so that the portions of the seal rings 203a and 203b near the inner walls are positioned between the limiting portion 204a and the bottom plate 2021a, and between the limiting portion 204b and the bottom plate 2021b, thereby restricting the movement of the seal rings 203a and 203b after fitting. Even if shaking or a collision occurs in a subsequent process, the seal rings fitted onto the posts will not be displaced. Therefore, even if parts such as post 2022a and post 2022b are moved in a subsequent process, seal ring 203a and seal ring 203b are restricted to their predetermined positions and will not move or shift in the thickness direction of cover body 201 (Y direction in the figure).When cover body 201, electrode terminal 202a, and electrode terminal 202b are assembling using post 2022a and post 2022b via post mounting holes 2011 and post mounting holes 2012 in a subsequent process, a portion of cover body 201 (i.e., the cover body portion around post mounting holes 2011 and post mounting holes 2012) accurately compresses the portions of seal ring 203a and seal ring 203b near their outer walls (i.e., the compressed C portion shown in Figure 6), thereby ensuring the sealing performance of cover member 200.

[0050] In a preferred embodiment, the limiting portion 204a (position limiting structure) and the limiting portion 204b (position limiting structure) provided on the outer wall of the post 2022a and the post 2022b are convex portions provided on the outer wall of the post 2022a and the post 2022b, respectively. FIG. 7(a) shows a state in which the convex portion 205 is provided to protrude from the outer wall of the post 2022a, using the post 2022a as an example. The shape of the convex portion 205 itself is not particularly limited, and it may be any shape that protrudes from the outer wall of a portion of the post 2022a and the post 2022b and can form an accommodation space with the outer wall of the portion of the post 2022a and the post 2022b and the bottom plate 2021a and the bottom plate 2021b, respectively, and the accommodation space can accommodate at least a partial region near the inner wall of the seal ring 203a and the seal ring 203b, respectively.

[0051] In another preferred embodiment, the limiting portions 204a (position limiting structures) and 204b (position limiting structures) provided on the outer walls of the posts 2022a and 2022b may be recesses provided on the outer walls of the posts 2022a and 2022b. FIG. 7(b) is a partial cross-sectional view of the post 2022a as an example. As shown in FIG. 7(b), a recess 206 is formed surrounding the outer peripheral surface of the column body of the post 2022a. The recess 206 and the bottom plate 2021a jointly form a storage space that can accommodate at least a portion of the area near the inner wall of the seal ring 203a. Similarly, the shape of the recess 206 itself is not particularly limited, and it need only match the shape of the portion of the seal ring 203a near the inner wall.

[0052] In a preferred embodiment, the protrusions 205 may be a plurality of protrusions arranged in an array on the outer wall of each of the posts 2022a and 2022b along the radial direction of the posts. Fig. 8 shows, using the post 2022a as an example, a situation in which three protrusions 205a are arranged at intervals around the outer surface of the post 2022a. Simply providing at least two, and preferably three or more, protrusions 205a can act to limit displacement of the seal ring 203a on the surface of the post 2022a, ensuring the sealing performance of the cover member 200 with a simple structure that does not require any extra parts.

[0053] In addition, the convex portion 205 may be a flange structure (not shown) that surrounds the entire outer wall of the post 2022a, and the flange structure can be easily formed using cutting technology. By molding it integrally with the post 2022a, it is possible to achieve positional restriction around the entire circumference of the seal ring 203a at low cost, thereby further improving the reliability of the positional restriction and ensuring the sealing performance of the cover member 200.

[0054] Furthermore, the protrusions 205 or recesses 206 and the posts 2022a and 2022b may all be integrally formed, specifically, the protrusions 205 or recesses 206 may be integrally formed during the pressing or cutting process for manufacturing the posts 2022a and 2022b.

[0055] Figure 9 is a partial enlarged view of part D shown in Figure 6. Figure 9(a) shows a state in which the seal ring 203a is restricted in position by the restricting portion 204a but has not yet been compressed by the cover main body 201, and Figure 9(b) shows a state in which the cover member 200 is sealed after the seal ring 203a has been compressed by the cover main body 201.

[0056] 9(b), when the cover member 200 is in a sealed state, the contact surface between the edge of the post mounting hole 2011 on the cover main body 201 and the seal ring 203a is a first contact surface X, and the contact surface between the limiting portion 204a and the seal ring 203a is a second contact surface Y. A height H1 of a portion of the seal ring 203a corresponding to the first contact surface X (i.e., a region close to its outer wall) is lower than a height H2 of a portion of the seal ring 203a corresponding to the second contact surface Y (i.e., a region close to its inner wall). In other words, the height of the portion of the seal ring 203a after it comes into contact with and is compressed by the cover main body 201 is lower than the height of the portion of the seal ring 203a whose position is restricted by the contact of the limiting portion 204a and the bottom plate 2021a. In other words, in a sealed state, the first contact surface X is closer to the bottom plate 2021a than the second contact surface Y.

[0057] Therefore, the portion of the seal ring 203a that is compressed by contact with the cover body 201 (i.e., the portion corresponding to the first contact surface X) undergoes more compressive deformation than other portions of the seal ring 203a, ensuring the sealing performance of the cover member 200, while the portion of the seal ring 203a that comes into contact with the limiting portion 204a (i.e., the portion corresponding to the first contact surface Y) does not require excessive compressive deformation, as long as it can come into contact without causing displacement of the limiting portion 204a. This ensures the positional restriction of the seal ring 203a while also ensuring the sealing effect of the cover member 200.

[0058] As a preferred embodiment, the relationship between the height H1 of a part of the seal ring 203a corresponding to the first contact surface X (i.e., the region near its inner wall) and the height H2 of a part of the seal ring 203a corresponding to the second contact surface Y (i.e., the region near its outer wall) satisfies the numerical relationship of 0.2*H2 < H1 < 0.8*H2. Among them, preferably 0.3*H2 < H1 < 0.7*H2, and more preferably 0.4*H2 < H1 < 0.6*H2.

[0059] The cover member 200 satisfying the above mathematical relationship has, in the thickness direction of the cover body, the relationship between the compression rate of the seal ring 203a at the first contact surface X where the sealing action occurs and the compression rate of the seal ring 203a at the location corresponding to the second contact surface Y where the position limiting action occurs. That is, the seal ring 203a at the first contact surface X can ensure the sealing performance by appropriate compression, and does not undergo excessive compression, and the seal ring 203a at the location corresponding to the second contact surface Y can be avoided from being affected by unnecessary excessive deformation and affecting the position limitation, and it is possible to achieve both a good position limiting action and ensuring the compression sealing performance.

[0060] FIG. 10 is a schematic view of the seal ring structure in an embodiment of the present invention (taking the seal ring 203a as an example), in which FIG. 10(a) is a side sectional view of the seal ring 203a, and FIG. 10(b) is a front view of the seal ring 203a. The material of the seal ring 203a is not particularly limited as long as it can be compressed and deformed to obtain a sealing action. As shown in FIG. 10, the difference A (the difference between the inner and outer radii) in the radial direction of the seal ring 203a, that is, the radial width of the seal ring 203a body, and the protruding height L1 where the convex portion 205 protrudes from the outer wall of the post, or the recess depth L2 where the concave portion 206 depresses from the outer wall of the post satisfy the relationship of the formula: (1 / 10)A < L1 < (1 / 3)A or (1 / 10)A < L2 < (1 / 3)A. Preferably, it satisfies the relationship of the formula: (1 / 9)A < L1 < (1 / 4)A or (1 / 9)A < L2 < (1 / 4)A, and more preferably, it satisfies the relationship of the formula: (1 / 7)A < L1 < (1 / 3)A or (1 / 7)A < L2 < (1 / 3)A.

[0061] Corresponding to the radial width A of the seal ring 203a body, the greater the protruding height L1 by which the convex portion 205 protrudes from the outer wall of the post, or the greater the recess depth L2 by which the concave portion 206 is recessed from the outer wall of the post, the greater the proportion of the portion of the seal ring 203a body that is restricted in position by the convex portion 205 or the concave portion 206, and the more favorable the effect of the position restriction. However, correspondingly, the proportion of the portion that contacts the cover body 201 of the seal ring 203a to produce a sealing effect decreases, and the sealing effect is affected. On the contrary, the smaller the protruding height L1 or the recess depth L2, the smaller the portion of the seal ring 203a body that is restricted in position, the position restriction effect becomes less desirable, and there is a possibility of affecting the sealing effect. Therefore, in a situation that satisfies the above mathematical relationship, both the position restriction action and the sealing effect can be兼备, and better sealing performance of the cover member 200 can be ensured.

[0062] In another preferred embodiment, in the present invention, the relationship between the width W in the thickness direction of the cover body 201 of the accommodation space and the initial thickness D of the original seal ring 203a when not compressed satisfies the formula: 0.7D < W < 0.95D.

[0063] According to this preferred embodiment, a part of the seal ring 203a provided in the accommodation space has a compression deformation rate in the thickness direction of the cover body 201 of 70% or more and 95% or less compared to its original initial thickness D when not compressed. With this numerical range, a part of the seal ring 203a provided in the accommodation space is appropriately compressed and deformed and is stably position-restricted, and at the same time, it is possible to avoid the other parts of the seal ring 203a being overly compressed and having an unnecessary impact on the sealing performance. Preferably, it satisfies the formula: 0.75D < W < 0.90D, and more preferably, it satisfies the formula: 0.8D < W < 0.85D.

[0064] Each of the above embodiments has been mainly described by taking the seal ring 203a as an example, but the above description can also be applied to the seal ring 203b, and repeated description is omitted.

[0065] <Second Embodiment> The basic structure of the cover member provided by the second embodiment of the present invention is essentially the same as that of cover member 200 of the first embodiment, so the same structure and symbols will be used and repeated description will be omitted. The difference from cover member 200 in the first embodiment is that in the second embodiment, limiting portions 204a and 204b as position limiting structures and convex portion 205 or concave portion 206 in the more preferred embodiment are eliminated, and instead the position limiting structures are adhesive layers 207a and 207b provided at the contact surfaces between seal ring 203a and seal ring 203b and the post, respectively.

[0066] Figures 11 to 14 show various installation states of the adhesive layer 207a in the second embodiment. Of these, Figure 11 shows a state in which the adhesive layer 207a is pre-applied to the outer wall side of the post 2022a and adheres to the inner ring side of the seal ring 203a. Of these, Figure 11(a) is a schematic diagram showing the adhesive layer 207a pre-applied to the outer wall side of the post 2022a but the seal ring 203a has not yet been fitted. Figure 11(b) is a schematic diagram showing the seal ring 203a and the adhesive layer 207a in contact with each other, fitted to the post 2022a, and compressed. Figure 12(a) is a schematic diagram showing the adhesive layer 207a pre-applied to the bottom plate 2021a but the seal ring 203a has not yet been fitted. Figure 12(b) is a schematic diagram showing the seal ring 203a in contact with the adhesive layer 207a, fitted to the post 2022a, and compressed.

[0067] As shown in Figures 11 and 12, during the process of inserting the sealing ring 203a from the opposite side of the bottom plate 2021a and fitting it onto the post 2022a, the adhesive layer 207a does not come into contact with other parts until the sealing ring 203a reaches a predetermined position, i.e., a predetermined position on the adhesive layer 207a. Therefore, there is no deviation in the adhesive position, and accurate positioning of the sealing ring 203a can be ensured.

[0068] Fig. 13 shows a state in which an adhesive layer 207a is provided in advance on the side of the seal ring 203a closest to the bottom plate 2021a, and the state after the seal ring 203a in Fig. 13 has been adhered to the bottom plate 2021a is the same as Fig. 12(b), so a repeated description will be omitted. Fig. 14 shows a state in which an adhesive layer 207a is provided in advance on the inner ring side of the seal ring 203a, and the state after the seal ring 203 in Fig. 14 has been adhered to the outer wall of the post 2022a is the same as Fig. 11(b), so a repeated description will be omitted.

[0069] In the situation shown in Figures 13 and 14, an adhesive layer 207a is provided in advance on the main body of the seal ring 203a as a position restriction structure, so that the adhesive layer 207a can be produced and managed together with the seal ring 203a as a single component, thereby reducing the number of components and improving production management efficiency.

[0070] Furthermore, in each of the above embodiments, the adhesive layer 207a is used as the position limiting structure, which is a very simple and low-cost structure that can be implemented without changing the shape of the existing outer wall of the post.

[0071] Furthermore, there are no particular restrictions on the dimensional relationship between adhesive layer 207a and seal ring 203a, such as the length, width, and thickness of adhesive layer 207a, as long as adhesive layer 207a adheres to seal ring 203a and does not cause displacement.

[0072] Although the adhesive layer 207a has been described above as an example, the positional relationship and principle of the adhesive layer 207b corresponding to the electrode terminal 202b are similar to those of the adhesive layer 207a, and therefore will not be described again.

[0073] In the above first and second embodiments, the position restriction structure is described using the restricting portion 204a, 204b as an example, the convex portion 205, the protrusion 205a, the concave portion 206, the adhesive layer 207a, and the adhesive layer 207b. From the above description, a person skilled in the art can understand that any structure, regardless of shape or material, that is provided on at least one side of the electrode terminal 202a, the electrode terminal 202b or the sealing ring 203a, the sealing ring 203b and can restrict the movement of the sealing ring 203a, the sealing ring 203b in the thickness direction of the cover body 201 falls within the scope of protection of the technical solution of the present invention.

[0074] <Third embodiment> Fig. 15 is an exploded schematic view of a secondary battery provided according to a third embodiment of the present invention. In Fig. 15, 208 is a housing having an upper opening 209, 210 is an electrode member placed on housing 208 via upper opening 209, and 211 is a top cover that seals upper opening 209. Of these, top cover 211 is the same as any cover member 200 provided in the first and second embodiments.

[0075] The secondary battery provided according to the third embodiment of the present invention uses the cover member 200 of the first or second embodiment, and therefore can fully ensure the sealing performance of the secondary battery.

[0076] <Fourth embodiment> The fourth embodiment of the present invention provides a battery pack (not shown) including the secondary battery provided by the third embodiment. The battery pack, which is composed of a plurality of secondary batteries, is not limited in terms of the series / parallel connection relationship, quantity, or arrangement.

[0077] At the same time, the fourth embodiment of the present invention also provides an electronic device (not shown) equipped with a battery pack as a power supply source for the electronic device. The type of the electronic device is not particularly limited.

[0078] According to the battery pack and electronic device provided in this embodiment, the cover member of the secondary battery used has good sealing performance, which ensures good sealing performance for the secondary battery and the battery pack as a whole, and ensures the usability of the battery pack and electronic device.

[0079] It should be noted that the above first to fourth embodiments are merely preferred embodiments of the present invention and cannot be used to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention are all included in the protection scope of the present invention. [Industrial Applicability]

[0080] The cover member, secondary battery, battery pack, and electronic device of the present invention can be applied to the technical field of power batteries. [Explanation of symbols]

[0081] 200: Cover member 201: Cover body 2011: Post mounting hole 2012: Post mounting hole 202a: Electrode terminal 202b: Electrode terminal 2021a: Bottom plate 2021b: Bottom plate 2022a: Post 2022b: Post 203a: Seal ring - Seal ring 203b: Seal ring - Seal ring 204a: Restriction section (position restriction structure) 204b: Restriction section (position restriction structure) 205: Convex part (position limiting structure) 205a: Protrusion (position limiting structure) 206: Recess (position limiting structure) 204a: Adhesive layer (position limiting structure) 207b: Adhesive layer (position restriction structure) 208: Cabinet 209:Top opening 210: Electrode member 211: Top cover X: 1st contact surface Y: 2nd contact surface

Claims

1. a cover body provided with a post mounting hole; an electrode terminal having a bottom plate provided on one side of the cover body, and a post provided on the bottom plate, at least a portion of which passes through the post mounting hole and extends to the other side of the cover body along the thickness direction of the cover body; a seal ring fitted to the post and at least a portion of which is disposed between the cover body and the bottom plate; A cover member, characterized in that at least one of the electrode terminal and the seal ring is provided with a position limiting structure that limits displacement of the seal ring in the thickness direction of the cover body.

2. The cover member according to claim 1 , wherein the position limiting structure includes a limiting portion provided on an outer wall of the post, and a portion of the seal ring is provided between the limiting portion and the bottom plate.

3. At least a portion of the seal ring near the outer wall is disposed between the cover body and the bottom plate; The cover member according to claim 2 , wherein at least a portion of the seal ring near the inner wall of the seal ring is disposed between the restrictor and the bottom plate.

4. a height of at least a portion of the seal ring near an inner wall of the seal ring is greater than a height of at least a portion of the seal ring near an outer wall of the seal ring; The cover member according to claim 3 , wherein the restricting portion abuts against the seal ring.

5. The limiting portion includes a protrusion provided on the outer wall of the post, and at least a portion of the seal ring near the inner wall of the seal ring is accommodated in an accommodating space formed by the protrusion, a portion of the outer wall of the post, and the bottom plate, or 5. The cover member according to claim 2, wherein the limiting portion includes a recess provided in the outer wall of the post, and at least a portion of the seal ring near the inner wall of the seal ring is accommodated in an accommodating space formed by the recess and the bottom plate.

6. The cover member according to claim 5 , wherein the protrusion or the recess is provided on the outer wall of the post so as to surround the outer wall of the post.

7. The protrusion includes a plurality of protrusions arranged in an array on the outer wall of the post along the radial direction of the post, or The cover member according to claim 6 , wherein the protrusion has a flange structure that is disposed on the outer wall of the post so as to surround the outer wall of the post along the circumferential direction of the post.

8. a portion where the edge of the post mounting hole and the seal ring come into contact forms a first contact surface; a portion where the limiting portion and the seal ring come into contact forms a second contact surface; The cover member according to claim 2 , wherein the first contact surface is closer to the base plate than the second contact surface.

9. 9. The cover member of claim 8, wherein the relationship between the thickness H1 of the portion of the seal ring corresponding to the first contact surface in the thickness direction of the cover body and the thickness H2 of the portion of the seal ring corresponding to the second contact surface in the thickness direction of the cover body satisfies the formula: 0.2*H2<H1<0.8*H2.

10. 7. The cover member of claim 6, wherein the relationship between a protruding height L1 of the convex portion protruding from the outer wall of the post or a recess depth L2 of the recess recessed from the outer wall of the post and a difference A between the inner and outer diameters of the seal ring satisfies the formula: (1 / 10)A<L1<(1 / 3)A or (1 / 10)A<L2<(1 / 3)A.

11. The cover member according to claim 5, wherein the relationship between the width W of the storage space in the thickness direction of the cover body and the initial thickness D of the seal ring when uncompressed satisfies the formula: 0.7D<W<0.95D.

12. The cover member according to claim 1 , wherein the position limiting structure is an adhesive layer provided on the contact surface between the seal ring and the post.

13. The adhesive layer is provided in advance on the outer wall side of the post and adheres to the inner ring side of the seal ring, or The adhesive layer is pre-applied to the bottom plate and adheres to the bottom side of the seal ring; or The adhesive layer is provided in advance on a side of the seal ring that is close to the bottom plate and adheres to the bottom plate, or The cover member according to claim 12, wherein the adhesive layer is provided in advance on the inner ring side of the seal ring and adheres to the outer wall of the post.

14. a housing having an upper end opening, an electrode member placed on the housing via the upper end opening, and a top cover that seals the upper end opening; The secondary battery, wherein the top cover is the cover member according to claim 1 .

15. A battery pack comprising the secondary battery according to claim 14.

16. An electronic device comprising the battery pack according to claim 15.

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