Lithium battery cover plate structure and lithium battery

Abstract

The utility model provides a lithium battery cover plate structure and a lithium battery, the lithium battery cover plate structure comprises a substrate and a plurality of tabs, the plurality of tabs are arranged on the substrate at intervals and penetrate through the substrate, and the substrate and the plurality of tabs are integrally formed by injection molding; wherein each tab comprises a plurality of plate sections which are sequentially connected, colloid layers are arranged on two opposite plate surfaces of at least one plate section in the plurality of plate sections, one side of each colloid layer is bonded with the plate surface of the plate section, and the other side of each colloid layer is welded with the substrate; the lithium battery cover plate provided by the utility model solves the problem that the sealing connection between the tab and the cover plate is not firm in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a lithium battery cover plate structure and a lithium battery. Background Art

[0002] Lithium batteries have the characteristics of high energy density, no memory effect, long single-cell cycle, high efficiency, cleanliness and no pollution, and have been widely used in recent years. Lithium batteries include lithium-ion batteries, which include cover plates and tabs. Lithium-ion batteries with plastic shell materials are also called plastic-shell lithium-ion batteries.

[0003] Most lithium-ion batteries achieve a sealed connection between the tab and the cover by setting a sealing ring on the cover, then placing the tab inside the sealing ring and mechanically compressing the sealing ring. However, the above connection method is relatively complicated, and there is a problem of deformation of the sealing ring resulting in a loose sealing connection between the tab and the cover. Utility Model Content

[0004] The main purpose of the utility model is to provide a lithium battery cover plate structure and a lithium battery, so as to solve the problem of weak sealing connection between the pole ear and the cover plate in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a lithium battery cover plate structure is provided, including a substrate and a pole ear, a plurality of pole ears are arranged on the substrate at intervals and penetrate the substrate, and the substrate and the plurality of pole ears are integrally formed by injection molding; wherein each pole ear includes a plurality of plate segments connected in sequence, and a colloid layer is provided on two opposite plate surfaces of at least one plate segment of the plurality of plate segments, one side of the colloid layer is bonded to the plate surface of the plate segment, and the other side of the colloid layer is fused to the substrate.

[0006] Furthermore, each pole ear includes a first plate segment, a second plate segment and a third plate segment connected in sequence, the extension direction of the first plate segment and the third plate segment are perpendicular to the extension direction of the substrate, and at least part of the first plate segment and the third plate segment are arranged to protrude from the substrate; the extension direction of the second plate segment is parallel to the extension direction of the substrate, the second plate segment is arranged inside the substrate, and a colloid layer is arranged on two opposite plate surfaces of the second plate segment and the third plate segment, and the colloid layer extends along the extension direction of its corresponding plate segment.

[0007] Furthermore, the first plate segment has a first connecting end and a first free end that are relatively arranged along its extension direction, the first free end is arranged above the substrate, and the first connecting end is connected to the first end of the second plate segment; the third plate segment has a second connecting end and a second free end that are relatively arranged along its extension direction, the second free end is arranged below the substrate, and the second connecting end is connected to the second end of the second plate segment; the substrate has an upper end face and a lower end face that are relatively arranged in a direction perpendicular to its extension direction; the colloid layer on the second plate segment is arranged between the two ends of the second plate segment, and between the upper end face and the lower end face.

[0008] Furthermore, at least a portion of the colloid layer on the third plate segment is disposed protruding from the lower end surface of the base plate.

[0009] Furthermore, the second plate segment includes a first arc segment, a first straight segment and a second arc segment connected in sequence, the first end of the first arc segment is connected to the first connecting end, the second end of the first arc segment is connected to the first end of the first straight segment; the second end of the first straight segment is connected to the first end of the second arc segment, the second end of the second arc segment is connected to the second connecting end, and a colloid layer is provided on two opposite plate surfaces of the first straight segment.

[0010] Furthermore, the length of the first plate segment is 31.6 mm, the length of the second plate segment is 3 mm, and the length of the third plate segment is 17.9 mm; the distance between the first free end of the first plate segment and the upper end surface of the substrate is 29 mm; and the radius of the first arc segment and the second arc segment is 0.3 mm.

[0011] Furthermore, the distance between any point on the upper surface of the second plate segment and the upper end surface of the substrate is 2.5 mm; the maximum distance between any point on the lower surface of the second plate segment and the lower end surface of the substrate along the extension direction of the third plate segment is 3.7 mm.

[0012] Further, the distance between the center of the colloid layer on the third plate segment and the first end of the second arc segment is 2.2 mm.

[0013] Furthermore, the substrate is injection-molded from an injection material, and the injection temperature of the injection material is greater than the melting point of the colloid layer.

[0014] According to another aspect of the utility model, a lithium battery is provided, comprising the above-mentioned lithium battery cover structure and a lithium battery shell, the lithium battery shell enclosing a lithium battery cavity, the substrate of the lithium battery cover structure is used to cover the lithium battery cavity to close the lithium battery cavity, and welding portions for welding connection to the lithium battery shell are provided on both sides of the substrate of the lithium battery cover structure.

[0015] By applying the technical solution of the utility model, the lithium battery cover plate structure includes a substrate and a pole ear, each pole ear includes a plurality of plate segments connected in sequence, and a colloid layer is provided on two opposite plate surfaces of at least one plate segment of the plurality of plate segments, one side of the colloid layer is bonded to the plate surface of the plate segment, and the other side of the colloid layer is fused to the substrate. By bonding one side of the colloid layer to the plate segment of the pole ear, a sealed connection between the colloid layer and the pole ear is achieved; by fusion bonding the other side of the colloid layer to the substrate, a sealed connection between the colloid layer and the substrate is achieved. By integrally molding the substrate and the plurality of pole ears through injection molding, the reliability of the sealed connection between the substrate and the plurality of pole ears is improved; by the colloid layer, a sealed connection between the pole ear and the substrate is achieved, and the reliability of the sealed connection between the pole ear and the substrate is further improved, thereby solving the problem of weak sealing connection between the pole ear and the cover plate in the prior art, and the lithium battery cover plate structure does not require mechanical compression during manufacturing, reducing the difficulty of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A cross-sectional schematic diagram of an embodiment of a lithium battery cover plate structure according to the utility model is shown;

[0018] Figure 2 A schematic diagram showing an embodiment of a lithium battery cover plate structure according to the utility model is shown;

[0019] Figure 3 A schematic diagram of a colloid layer and a tab of a lithium battery cover structure according to the present invention is shown.

[0020] The above drawings include the following reference numerals:

[0021] 10. Base plate; 11. Upper end surface; 12. Lower end surface; 20. Tab; 30. Colloidal layer; 21. First plate segment; 22. Second plate segment; 23. Third plate segment; 211. First connecting end; 212. First free end; 231. Second connecting end; 232. Second free end; 221. First arc segment; 222. First straight segment; 223. Second arc segment; 15. Welding portion. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] The utility model provides a lithium battery cover structure, please refer to Figures 1 to 3 , including a substrate 10 and a tab 20, wherein a plurality of tabs 20 are arranged on the substrate 10 at intervals and penetrate the substrate 10, and the substrate 10 and the plurality of tabs 20 are integrally formed by injection molding; wherein each tab 20 includes a plurality of plate segments connected in sequence, and a colloid layer 30 is arranged on two opposite plate surfaces of at least one plate segment of the plurality of plate segments, one side of the colloid layer 30 is bonded to the plate surface of the plate segment, and the other side of the colloid layer 30 is fused to the substrate 10.

[0026] The lithium battery cover plate structure of the utility model includes a substrate 10 and a pole ear 20, each pole ear 20 includes a plurality of plate segments connected in sequence, and a colloid layer 30 is provided on two opposite plate surfaces of at least one plate segment of the plurality of plate segments, one side of the colloid layer 30 is bonded to the plate surface of the plate segment, and the other side of the colloid layer 30 is welded to the substrate 10. By bonding one side of the colloid layer 30 to the plate segment of the pole ear 20, a sealed connection between the colloid layer 30 and the pole ear 20 is achieved; by welding the other side of the colloid layer 30 to the substrate 10, a sealed connection between the colloid layer 30 and the substrate 10 is achieved. By the substrate 10 and the plurality of pole ears 20 being integrally molded by injection molding, the reliability of the sealed connection between the substrate 10 and the plurality of pole ears 20 is improved; by the colloid layer 30, a sealed connection between the pole ear 20 and the substrate 10 is achieved, and the reliability of the sealed connection between the pole ear 20 and the substrate 10 is further improved, thereby solving the problem of weak sealed connection between the pole ear and the cover plate in the prior art, and the lithium battery cover plate structure does not require mechanical compression during manufacturing, reducing the difficulty of production.

[0027] Specifically, two pole tabs 20 are arranged on the substrate 10 at intervals, one pole tab 20 is an aluminum pole tab, and the other pole tab 20 is a copper-plated nickel pole tab.

[0028] In this embodiment, if Figure 1As shown, each pole ear 20 includes a first plate segment 21, a second plate segment 22 and a third plate segment 23 which are connected in sequence. The extension directions of the first plate segment 21 and the third plate segment 23 are perpendicular to the extension direction of the substrate 10, and at least part of the first plate segment 21 and the third plate segment 23 protrude from the arrangement of the substrate 10; the extension direction of the second plate segment 22 is parallel to the extension direction of the substrate 10, and the second plate segment 22 is arranged inside the substrate 10. The colloid layer 30 is arranged on two opposite plate surfaces of the second plate segment 22 and the third plate segment 23, and the colloid layer 30 extends along the extension direction of its corresponding plate segment.

[0029] Specifically, by arranging the extension direction of the first plate segment 21 and the third plate segment 23 to be perpendicular to the extension direction of the second plate segment 22 , the welding area between the substrate 10 and the colloid layer 30 can be increased, further ensuring the reliability of the sealing connection between the substrate 10 and the tab 20 .

[0030] Specifically, the colloid layer 30 disposed on the second plate segment 22 extends along the extension direction of the second plate segment 22 , and the colloid layer 30 disposed on the third plate segment 23 extends along the extension direction of the third plate segment 23 .

[0031] In this embodiment, if Figure 1 As shown, the first plate segment 21 has a first connecting end 211 and a first free end 212 which are arranged opposite to each other along its extension direction, the first free end 212 is arranged above the substrate 10, and the first connecting end 211 is connected to the first end of the second plate segment 22; the third plate segment 23 has a second connecting end 231 and a second free end 232 which are arranged opposite to each other along its extension direction, the second free end 232 is arranged below the substrate 10, and the second connecting end 231 is connected to the second end of the second plate segment 22; the substrate 10 has an upper end face 11 and a lower end face 12 which are arranged opposite to each other in a direction perpendicular to its extension direction; the colloid layer 30 on the second plate segment 22 is arranged between the two ends of the second plate segment 22, and between the upper end face 11 and the lower end face 12.

[0032] Specifically, the colloid layer 30 on the second plate segment 22 is arranged between the two ends of the second plate segment 22 and between the upper end surface 11 and the lower end surface 12, so that the colloid layers 30 on the two plate surfaces of the second plate segment 22 are tightly welded to the substrate 10, thereby ensuring the reliability of the sealing connection between the second plate segment 22 and the substrate 10.

[0033] In this embodiment, if Figure 2 and Figure 3As shown, at least part of the colloid layer 30 on the third plate segment 23 is protruding from the lower end surface 12 of the substrate 10. Such a configuration can ensure that at least part of the colloid layer 30 protruding from the lower end surface 12 of the substrate 10 can block the gap between the third plate segment 23 and the substrate 10, and prevent the electrolyte in the cavity from entering the interior of the substrate 10 through the gap between the tab 20 and the substrate 10 when the substrate 10 is covered on the battery cavity, causing damage to the substrate 10.

[0034] In this embodiment, as 1 and Figure 3 As shown, the second plate segment 22 includes a first arc segment 221, a first straight segment 222 and a second arc segment 223 which are connected in sequence. The first end of the first arc segment 221 is connected to the first connecting end 211, and the second end of the first arc segment 221 is connected to the first end of the first straight segment 222; the second end of the first straight segment 222 is connected to the first end of the second arc segment 223, and the second end of the second arc segment 223 is connected to the second connecting end. The colloid layer 30 is provided on two opposite plate surfaces of the first straight segment 222.

[0035] Specifically, the first arc segment 221 and the second arc segment 223 are respectively used to connect the first plate segment 21 and the third plate segment 23 , and the first straight segment 222 is used to set the colloid layer 30 , thereby making the second plate segment 22 sealed and connected to the substrate 10 .

[0036] In this embodiment, if Figure 1 As shown, the length of the first plate segment 21 is 31.6 mm, the length of the second plate segment 22 is 3 mm, and the length of the third plate segment 23 is 17.9 mm; the distance between the first free end of the first plate segment 21 and the upper end surface 11 of the substrate 10 is 29 mm; the radius of the first arc segment 221 and the second arc segment 223 is 0.3 mm.

[0037] Specifically, the length range of the first plate segment 21 is greater than 2.6 mm and less than 46.8 mm; the length range of the second plate segment 22 is greater than 0 mm and less than 18.2 mm; the length range of the third plate segment 23 is greater than 3.7 mm and less than 46.9 mm; the radius range of the first arc segment 221 and the second arc segment 223 is greater than 0 mm and less than 0.6 mm; the distance range between the first free end of the first plate segment 21 and the upper end surface 11 of the substrate 10 is greater than 0 mm and less than 43.2 mm.

[0038] In this embodiment, if Figure 1 As shown, the distance between any point on the upper plate surface of the second plate segment 22 and the upper end surface 11 of the substrate 10 is 2.5 mm; the maximum distance between any point on the lower plate surface of the second plate segment 22 and the lower end surface 12 of the substrate 10 along the extension direction of the third plate segment 23 is 3.7 mm.

[0039] Specifically, the distance between any point on the upper plate surface of the second plate segment 22 and the upper end surface 11 of the substrate 10 is greater than 0 mm and less than 6.2 mm; the maximum distance between any point on the lower plate surface of the second plate segment 22 and the lower end surface 12 of the substrate 10 along the extension direction of the third plate segment 23 refers to the distance between any point on the lower plate surface of the second plate segment 22 and the lower end surface 12 directly opposite to it, and the value range is greater than 0 mm and less than 6.2 mm.

[0040] Specifically, the upper plate surface of the second plate segment 22 refers to the plate surface close to the first plate segment 21 ; and the lower plate surface of the second plate segment 22 refers to the plate surface close to the third plate segment 23 .

[0041] In this embodiment, the distance between the center of the colloid layer 30 on the third plate segment 23 and the first end of the second arc segment 223 is 2.2 mm. Such a configuration can ensure that at least part of the colloid layer 30 protrudes from the lower end surface 12 of the substrate 10, thereby ensuring that the colloid layer 30 can block the gap between the third plate segment 23 and the substrate 10.

[0042] Specifically, the distance between the center of the colloid layer 30 on the third plate segment 23 and the first end of the second arc segment 223 is in the range of greater than 0 mm and less than 17.9 mm.

[0043] Specifically, such a configuration can ensure that the colloid layer 30 can be fully bonded to the tab 20 , thereby ensuring that the tab 20 can be fully sealed and connected to the substrate 10 .

[0044] In this embodiment, the substrate 10 is injection molded by an injection molding material, and the injection molding temperature of the injection molding material is greater than the melting point of the colloid layer 30. Such a setting can ensure that when the tab 20 and the substrate 10 are integrally molded by injection molding, the colloid layer 30 can be melted with the injection molding material, so that the colloid layer 30 and the substrate 10 are fused, thereby ensuring the reliability of the sealed connection between the tab 20 and the substrate 10.

[0045] Optionally, the substrate 10 is injection molded from polypropylene; the melting point of the colloid layer 30 is 145° C., and the temperature of the injection material when it reaches the mold is 160-180° C.

[0046] In specific implementation, the colloid layer 30 is first hot-pressed and bonded to each plate segment of the tab 20 , and then the tab 20 is inserted into a mold for making the substrate 10 , and then the injection molding material is injected into the mold to wrap the tab 20 to form a lithium battery cover structure.

[0047] The utility model also provides a lithium battery, including the lithium battery cover structure and the lithium battery shell in the above embodiment, the lithium battery shell surrounds a lithium battery cavity, the substrate 10 of the lithium battery cover structure is used to cover the lithium battery cavity to close the lithium battery cavity, and welding parts 15 for welding connection with the lithium battery shell are arranged on both sides of the substrate 10 of the lithium battery cover structure.

[0048] The lithium battery of the utility model includes the lithium battery cover plate structure and the lithium battery shell in the above-mentioned embodiment. The substrate 10 of the lithium battery cover plate structure is used to cover the lithium battery cavity to close the lithium battery cavity. At this time, the pole ear 20 below the substrate 10 is located in the lithium battery cavity. The two sides of the substrate 10 of the lithium battery cover plate structure are provided with welding parts 15 for welding and connecting with the lithium battery shell. The lithium battery shell is tightly connected to the substrate 10 through the welding part 15 to prevent the lithium battery cover plate structure from being separated from the lithium battery cavity. The lithium battery cover plate structure includes a substrate 10 and a pole ear 20, each pole ear 20 includes a plurality of plate segments connected in sequence, and a colloid layer 30 is provided on two opposite plate surfaces of at least one plate segment of the plurality of plate segments, one side of the colloid layer 30 is bonded to the plate surface of the plate segment, and the other side of the colloid layer 30 is fused to the substrate 10. By bonding one side of the colloid layer 30 to the plate section of the pole tab 20, a sealed connection between the colloid layer 30 and the pole tab 20 is achieved; by fusing the other side of the colloid layer 30 to the substrate 10, a sealed connection between the colloid layer 30 and the substrate 10 is achieved. By integrally molding the substrate 10 and the plurality of pole tabs 20 by injection molding, the reliability of the sealed connection between the substrate 10 and the plurality of pole tabs 20 is improved; the sealed connection between the pole tab 20 and the substrate 10 is achieved by the colloid layer 30, and the reliability of the sealed connection between the pole tab 20 and the substrate 10 is further improved, thereby solving the problem of weak sealing connection between the pole tab and the cover plate in the prior art, and the lithium battery cover plate structure does not require mechanical compression during manufacturing, reducing the difficulty of production.

[0049] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0050] The lithium battery cover plate structure of the utility model includes a substrate 10 and a pole ear 20, each pole ear 20 includes a plurality of plate segments connected in sequence, and a colloid layer 30 is provided on two opposite plate surfaces of at least one plate segment of the plurality of plate segments, one side of the colloid layer 30 is bonded to the plate surface of the plate segment, and the other side of the colloid layer 30 is welded to the substrate 10. By bonding one side of the colloid layer 30 to the plate segment of the pole ear 20, a sealed connection between the colloid layer 30 and the pole ear 20 is achieved; by welding the other side of the colloid layer 30 to the substrate 10, a sealed connection between the colloid layer 30 and the substrate 10 is achieved. By the substrate 10 and the plurality of pole ears 20 being integrally molded by injection molding, the reliability of the sealed connection between the substrate 10 and the plurality of pole ears 20 is improved; by the colloid layer 30, a sealed connection between the pole ear 20 and the substrate 10 is achieved, and the reliability of the sealed connection between the pole ear 20 and the substrate 10 is further improved, thereby solving the problem of weak sealed connection between the pole ear and the cover plate in the prior art, and the lithium battery cover plate structure does not require mechanical compression during manufacturing, reducing the difficulty of production.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0053] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A lithium battery cover structure, comprising a substrate (10) and a tab (20), wherein a plurality of tabs (20) are arranged on the substrate (10) at intervals and penetrate the substrate (10), characterized in that: The substrate (10) and the plurality of tabs (20) are integrally formed by injection molding; Each of the pole lugs (20) comprises a plurality of plate segments connected in sequence, and a colloid layer (30) is provided on two opposite plate surfaces of at least one of the plurality of plate segments, one side of the colloid layer (30) is bonded to the plate surface of the plate segment, and the other side of the colloid layer (30) is welded to the substrate (10).

2. The lithium battery cover structure according to claim 1, characterized in that: Each of the pole lugs (20) comprises a first plate segment (21), a second plate segment (22) and a third plate segment (23) which are connected in sequence, the extension direction of the first plate segment (21) and the third plate segment (23) are both perpendicular to the extension direction of the base plate (10), and at least part of the first plate segment (21) and the third plate segment (23) are arranged to protrude from the base plate (10); The extension direction of the second plate segment (22) is parallel to the extension direction of the substrate (10); the second plate segment (22) is arranged inside the substrate (10); the colloid layer (30) is arranged on two opposite plate surfaces of the second plate segment (22) and the third plate segment (23); and the colloid layer (30) extends along the extension direction of its corresponding plate segment.

3. The lithium battery cover structure according to claim 2, characterized in that: The first plate segment (21) has a first connecting end (211) and a first free end (212) which are arranged opposite to each other along its extension direction; the first free end (212) is arranged above the base plate (10); and the first connecting end (211) is connected to the first end of the second plate segment (22); The third plate segment (23) has a second connecting end (231) and a second free end (232) which are arranged opposite to each other along its extension direction, the second free end (232) is arranged below the base plate (10), and the second connecting end (231) is connected to the second end of the second plate segment (22); The substrate (10) has an upper end surface (11) and a lower end surface (12) which are arranged opposite to each other in a direction perpendicular to its extension direction; The colloid layer (30) on the second plate segment (22) is arranged between the two ends of the second plate segment (22) and between the upper end surface (11) and the lower end surface (12).

4. The lithium battery cover structure according to claim 2, characterized in that: At least a portion of the colloid layer (30) on the third plate segment (23) is arranged to protrude from the lower end surface (12) of the substrate (10).

5. The lithium battery cover structure according to claim 3, characterized in that: The second plate segment (22) comprises a first arc segment (221), a first straight segment (222) and a second arc segment (223) which are connected in sequence; the first end of the first arc segment (221) is connected to the first connecting end (211), and the second end of the first arc segment (221) is connected to the first end of the first straight segment (222); the second end of the first straight segment (222) is connected to the first end of the second arc segment (223), and the second end of the second arc segment (223) is connected to the second connecting end (231); and the colloid layer (30) is provided on two opposite plate surfaces of the first straight segment (222).

6. The lithium battery cover structure according to claim 5, characterized in that: The length of the first plate segment (21) is 31.6 mm, the length of the second plate segment (22) is 3 mm, and the length of the third plate segment (23) is 17.9 mm; The distance between the first free end of the first plate segment (21) and the upper end surface (11) of the base plate (10) is 29 mm; The radius of the first arc segment (221) and the second arc segment (223) is 0.3 mm.

7. The lithium battery cover structure according to claim 5, characterized in that: The distance between any point on the upper plate surface of the second plate segment (22) and the upper end surface (11) of the base plate (10) is 2.5 mm; The maximum distance between any point on the lower plate surface of the second plate segment (22) and the lower end surface (12) of the base plate (10) along the extension direction of the third plate segment (23) is 3.7 mm.

8. The lithium battery cover structure according to claim 5, characterized in that: The distance between the center of the colloid layer (30) on the third plate segment (23) and the first end of the second arc segment (223) is 2.2 mm.

9. The lithium battery cover structure according to claim 5, characterized in that: The substrate (10) is injection-molded from an injection material, and the injection temperature of the injection material is greater than the melting point of the colloid layer (30).

10. A lithium battery, characterized in that: It comprises a lithium battery cover plate structure and a lithium battery shell as described in any one of claims 1 to 9, wherein the lithium battery shell encloses a lithium battery cavity, and a substrate (10) of the lithium battery cover plate structure is used to cover the lithium battery cavity to close the lithium battery cavity, and welding portions (15) for welding connection to the lithium battery shell are provided on both sides of the substrate (10) of the lithium battery cover plate structure.

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