Top cover plate, cover plate assembly and cylindrical battery

Abstract

The utility model belongs to the technical field of power batteries, and discloses a top cover plate, a cover plate assembly and a cylindrical battery. The top cover piece comprises a top cover piece body and a turnover part, the turnover part is arranged on the peripheral face of the top cover piece body and comprises a flange structure and a folded edge, the flange structure is cylindrical and arranged on the periphery of the top cover piece body in a surrounding mode, and the flange structure points to the bottom wall of the top cover piece body from the top wall of the top cover piece body. A first indentation groove is formed between the inner side wall of the flange structure and the top cover piece body, and the first indentation groove is arranged in the mode that when the first indentation groove is formed, the flange structure can deform, so that the length of the vertical part of the outer side wall of the flange structure can be increased; the folded edge surrounds and protrudes out of the periphery of the flange structure. The arrangement of the first indentation groove can increase the fitting connection length of the flange structure and the shell, so that the contact area between the flange structure and the shell is increased, and the matching stability between the top cover sheet and the shell is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field especially relates to a top cover sheet, cover plate subassembly and cylindrical battery. BACKGROUND

[0002] With the increasingly mature power battery technology, power batteries have been widely used in electric vehicles and energy storage fields, and the use performance and safety of power batteries are increasingly required. Among them, the cover plate assembly as an important accessory in the power battery, its role is to make the internal and external environment isolated to play a sealing role after welding with the battery shell, and connect the internal and external circuits to play the internal current flow guiding role.

[0003] The cover plate assembly is generally mainly composed of a top cover sheet and a pole column installed on the top cover sheet. The cover plate assembly provided by the prior art is usually first abutted together by the edge of the folding part provided on the outer edge of the top cover sheet and the opening edge of the battery shell, and then fixedly connected by welding. However, the R angle of the existing top cover sheet folding part is too large, which leads to the shortness of the straight edge of the folding part, the reduction of the contact area between the folding part and the battery shell, and the insufficient contact, thereby affecting the stability of the cooperation and being not conducive to the precise alignment between the top cover sheet and the battery shell, thereby increasing the complexity of assembly.

[0004] Therefore, there is an urgent need for a top cover sheet, a cover plate assembly and a cylindrical battery to solve the problems existing in the prior art. INVENTION CONTENTS

[0005] The first purpose of the utility model is to provide a top cover sheet, which solves the technical problems of low stability and complex assembly between the existing top cover sheet and the battery shell.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The top cover sheet is applied to a cylindrical battery, and the top cover sheet comprises a top cover sheet body and a folding part. The outer peripheral surface of the top cover sheet body is provided with the folding part. The folding part comprises a flange structure and a folded edge. Wherein:

[0008] The flange structure is in a cylindrical shape and surrounds the periphery of the top cover sheet body. From the direction of the top wall of the top cover sheet body pointing to the bottom wall of the top cover sheet body, a first indentation groove is arranged between the inner side wall of the flange structure and the top cover sheet body. When the first indentation groove is formed, the flange structure can be deformed to increase the length of the vertical part of the outer side wall of the flange structure.

[0009] The folded edge surrounds and protrudes from the periphery of the flange structure.

[0010] As preferred, the depth of the first indentation groove is h1, 0.08≤h1≤0.12mm.

[0011] As preferred, a bevel is arranged between the groove bottom of the first indentation groove and the top cover sheet body.

[0012] As preferred, the projection length dimension of the bevel on the horizontal plane is m, 0.3≤m≤0.9mm.

[0013] As preferred, along the direction from the bottom wall of the folded edge to the top wall of the folded edge, the connection between the folded edge and the outer side wall of the flange structure is concavely provided with a second indentation groove.

[0014] As preferred, the depth of the second indentation groove is h2, 0.05≤h2≤0.1mm.

[0015] The second purpose of the utility model lies in providing a cover plate assembly, which can improve the assembly stability and assembly quality of the cover plate assembly and the shell of the cylindrical battery.

[0016] To achieve the purpose, the utility model adopts the following technical scheme:

[0017] The cover plate assembly comprises a liquid injection sealing nail and the above-mentioned top cover sheet, the top cover sheet body of the top cover sheet is provided with a liquid injection groove, the groove bottom of the liquid injection groove is provided with a liquid injection hole, the liquid injection sealing nail is sealingly inserted into the liquid injection hole, and the outer circumferential surface of the liquid injection sealing nail is attached to and welded to the side wall of the liquid injection groove.

[0018] As preferred, along the direction from the bottom wall of the top cover sheet to the top wall of the top cover sheet, the connection between the bottom wall of the top cover sheet body and the side wall of the liquid injection groove is concavely provided with a third indentation groove, the third indentation groove is arranged in such a manner that when the third indentation groove is formed, the side wall of the liquid injection groove can be deformed, so that the angle of the chamfer between the inner side wall of the liquid injection groove and the top cover sheet body can be reduced.

[0019] As preferred, the depth of the third indentation groove is h3, 0.08≤h3≤0.12mm.

[0020] To achieve the purpose, the utility model adopts the following technical scheme:

[0021] The cylindrical battery comprises a shell, an electric core and the above-mentioned cover plate assembly, the shell is built-in with the electric core, and the cover plate assembly is sealingly covered on the shell.

[0022] Beneficial effect: Since a first indentation groove is provided during the production of the top cover sheet, and the first indentation groove is formed during the process of being driven to deform the flange structure so as to reduce the R angle between the outer wall of the flange structure and the main body of the top cover sheet, the length of the vertical portion of the outer wall of the flange structure is increased, thereby increasing the length of the fitting connection between the flange structure and the shell, so that the contact area between the flange structure and the shell is increased, the contact is more sufficient, and the matching stability between the top cover sheet and the shell is ensured, which also helps to improve the assembly accuracy between the top cover sheet and the shell and reduce the complexity of assembly. By providing the above-mentioned top cover sheet on the cover plate assembly, the assembly stability and assembly quality of the cover plate assembly and the shell of the cylindrical battery can be improved, thereby improving the production quality and assembly stability of the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a cylindrical battery provided by an embodiment of the present utility model;

[0024] Figure 2 1 is a top view of a cylindrical battery provided by an embodiment of the present utility model;

[0025] Figure 3 It is along Figure 2 Cross-sectional view at AA in the middle;

[0026] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0027] Figure 5 yes Figure 3 A partial enlarged view of point C in the middle.

[0028] In the picture:

[0029] 100, cylindrical battery; 110, housing; 120, cover assembly; 121, liquid injection sealing nail;

[0030] 10. R angle;

[0031] 1. Top cover body; 11. First indentation groove; 12. Bevel; 13. Third indentation groove;

[0032] 2. Folding portion; 21. Flange structure; 22. Folding edge. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0034] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship.For the ordinary skilled in the art, the above-mentioned terms can be understood in the specific meaning in the utility model according to the specific circumstances.

[0035] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.

[0036] In the description of the embodiment, the terms "on", "under", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0037] The top cover sheet, the cover plate assembly 120 and the cylindrical battery 100 provided by the utility model embodiment are described below with reference to the drawings and specific embodiments.In the embodiment, the cylindrical battery 100 includes a shell 110 and the cover plate assembly 120 described above, when the cover plate assembly 120 is connected to the shell 110, the top cover sheet in the cover plate assembly 120 can be sealed and arranged on the opening edge of the shell 110, and then the top cover sheet is fixed on the shell 110 by welding or other methods, so as to complete the purpose of fixing and connecting the cover plate assembly 120 on the shell 110.

[0038] In combination with Figures 1 to 5As shown, the top cover sheet provided by the embodiment includes a top cover sheet body 1 and a folded portion 2, the cross-sectional shape of the top cover sheet body 1 is circular, and the folded portion 2 described above is arranged on the outer peripheral surface of the top cover sheet body 1. The folded portion 2 includes a flange structure 21 and a folded edge 22, wherein the flange structure 21 is in a cylindrical shape and surrounds the peripheral edge of the top cover sheet body 1, and from the direction in which the top wall of the top cover sheet body 1 points to the bottom wall of the top cover sheet body 1, a first indentation groove 11 is arranged between the inner side wall of the flange structure 21 and the top cover sheet body 1, and when the first indentation groove 11 is formed, the flange structure 21 can be deformed to increase the length of the vertical part of the outer side wall of the flange structure 21; and the folded edge 22 surrounds and protrudes from the peripheral edge of the flange structure 21.

[0039] Through the above-mentioned top cover sheet, when connected with the shell 110 of the cylindrical battery 100, the outer side wall of the flange structure 21 in the top cover sheet can be connected with the inner side wall of the shell 110, and the folded edge 22 in the top cover sheet can be connected with the opening edge of the shell 110, so that the top cover sheet can be tightly connected with the shell 110, and the assembly between the two is completed, and then a weld is formed by laser welding at the connection between the folded edge 22 and the opening edge of the shell 110, so that the fixed connection between the top cover sheet and the shell 110 is completed.

[0040] In addition, since the first indentation groove 11 described above is arranged during the production of the top cover sheet, and the first indentation groove 11 can drive the flange structure 21 to deform during formation to reduce the R angle between the outer side wall of the flange structure 21 and the top cover sheet body 1, thereby increasing the length of the vertical part of the outer side wall of the flange structure 21, and further increasing the length of the flange structure 21 connected with the shell 110, increasing the contact area between the flange structure 21 and the shell 110, and making the contact more sufficient, ensuring the stability of the cooperation between the top cover sheet and the shell 110, and also helping the assembly precision between the top cover sheet and the shell 110, and reducing the complexity of the assembly.

[0041] Optionally, in this embodiment, the depth of the first indentation groove 11 is set to h1, 0.08≤h1≤0.12mm, and the preferred values ​​of h1 are 0.08mm, 0.09mm, 0.1mm, 0.11mm, and 0.12mm. If the depth of the first indentation groove 11 is too small, the flange structure 21 cannot be fully fitted and contacted with the shell 110. If the depth of the first indentation groove 11 is too large, there is a risk of crushing the top cover sheet body 1. By controlling the depth h1 of the first indentation groove 11 between 0.08mm and 0.12mm, it is possible to ensure that the flange structure 21 is fully in contact with the side wall of the shell 110 and the safety of the top cover sheet body 1. Of course, in other embodiments of the present invention, the depth range of the first indentation groove 11 can be selected according to the actual thickness of the top cover sheet body 1 and is not limited to the 0.08mm-0.12mm of this embodiment.

[0042] Optionally, in this embodiment, reference Figure 4 As shown, a bevel 12 is provided between the bottom of the first indentation groove 11 and the top cover sheet body 1. The provision of the bevel 12 can change the geometric shape of the top cover sheet body 1, thereby making the transition of the first indentation groove 11 more natural, reducing its visual prominence, and diluting the visual effect of the first indentation groove 11 on the top cover sheet, making the top cover sheet more beautiful. For example, this embodiment achieves the effect of changing the appearance of the top cover sheet by adjusting the inclination length or inclination angle of the bevel 12, and sets the projection length of the bevel 12 on the horizontal plane to m, 0.3≤m≤0.9mm, and the preferred value of m is 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm. It is understandable that if the projection length of the bevel 12 on the horizontal plane is too large, it may cause the top cover sheet structure to be unstable or visually inconsistent, and if it is too small, the first indentation groove 11 cannot be effectively diluted and still appears abrupt. Controlling the projected length m of the oblique edge 12 on the horizontal plane to between 0.3 mm and 0.9 mm can not only ensure the strength and visual harmony of the top cover sheet structure, but also effectively reduce the indentation of the first indentation groove 11. Of course, in other embodiments of the present invention, the value range of m can be selected according to the actual structure of the top cover sheet and is not limited to the 0.3 mm to 0.9 mm of this embodiment.

[0043] As known from the prior art, in the existing cylindrical battery 100, the surface of the shell 110 and the surface of the top cover are usually plated with a nickel layer to prevent corrosion. In the process of assembling the cover assembly 120 on the shell 110, in order to prevent the nickel layer from being scraped off, in this embodiment, Figure 4As shown, along the direction from the bottom wall of the flange 22 to the top wall of the flange 22, the junction between the flange 22 and the outer side wall of the flange structure 21 is concavely provided with a second indentation groove 221. The provision of the second indentation groove 221 can prevent the corner of the side wall of the shell 110 from directly contacting the junction between the bottom wall of the flange 22 and the outer side wall of the flange structure 21, thereby avoiding the possibility of the nickel layer provided at the corner of the side wall of the shell 110 and the nickel layer at the junction between the bottom wall of the flange 22 and the outer side wall of the flange structure 21 being abraded and falling off, and thus maintaining the anticorrosion function of the cylindrical battery 100.

[0044] Exemplarily, in the embodiment, the depth h2 of the second indentation groove 221 is set to be 0.05mm-0.1mm, and the preferred values of h2 are 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm and 0.1mm. It can be understood that if the depth of the second indentation groove 221 is too large, there is a risk of penetrating and damaging the flange 22, and if the depth of the first indentation groove 11 is too small, it cannot achieve the effect of avoiding the corner of the edge of the shell 110. Controlling the depth h2 of the second indentation groove 221 to be 0.05mm-0.1mm can ensure that the nickel layer is not abraded and fallen off, and can also ensure the safety of the flange 22. Of course, in other embodiments of the utility model, the depth of the second indentation groove 221 can be selected according to actual conditions, and is not limited to 0.05mm-0.1mm in the embodiment.

[0045] Another purpose of the embodiment is to provide a cover plate assembly 120, which comprises the liquid injection sealing nail 121 and the top cover sheet described above. The top cover sheet body 1 of the top cover sheet is provided with a liquid injection groove, the groove bottom of the liquid injection groove is provided with a liquid injection hole, electrolyte can be input into the cylindrical battery 100 through the liquid injection hole, and the liquid injection sealing nail 121 is sealingly inserted into the liquid injection hole and is welded and connected to the side wall of the liquid injection groove. Since the cover plate assembly 120 is provided with the top cover sheet described above, the assembly stability and assembly quality of the cover plate assembly 120 and the shell 110 of the cylindrical battery 100 can be improved.

[0046] It should be noted that the cover plate assembly 120 provided in the embodiment further comprises a pole, a sealing ring and other components. Since the pole, the sealing ring and other components are all conventional structures, the components will not be described herein.

[0047] Further, as shown in FIG. 6, the cover plate assembly 120 further comprises a liquid injection sealing nail 121. The liquid injection sealing nail 121 is sealingly inserted into the liquid injection hole of the liquid injection groove of the top cover sheet body 1, and the outer circumferential surface of the liquid injection sealing nail 121 is welded and connected to the side wall of the liquid injection groove. Figure 5In the embodiment, the junction of the bottom wall of the top cover sheet body 1 and the side wall of the liquid injection groove is concavely provided with a third indentation groove 13 in the direction from the bottom wall to the top wall of the top cover sheet. When the third indentation groove 13 is formed, the side wall of the liquid injection groove can be deformed to reduce the angle of the chamfer between the inner side wall of the liquid injection groove and the top cover sheet body 1. The third indentation groove 13 increases the contact area between the side wall of the liquid injection groove and the end of the liquid injection sealing nail 121, thereby reducing the welding gap between the side wall of the liquid injection groove and the end of the liquid injection sealing nail 121, and further increasing the welding yield and the connection stability between the top cover sheet and the liquid injection sealing nail 121.

[0048] In the embodiment, the depth of the third indentation groove 13 is h3, 0.08mm≤h3≤0.12mm, and the preferred values of h3 are 0.09mm, 0.1mm, 0.11mm and 0.12mm. It can be understood that if the depth of the third indentation groove 13 is too large, the top cover sheet may be penetrated to cause liquid leakage. If the depth of the third indentation groove 13 is too small, the effect of reducing the welding gap is not sufficient. Controlling the depth h3 of the third indentation groove 13 to be between 0.08mm and 0.12mm can ensure that the welding gap is small enough to meet the connection strength requirement between the top cover sheet and the liquid injection sealing nail 121 in actual working conditions, and can ensure that the top cover sheet is safe and will not be damaged. Of course, in other embodiments of the present application, the depth of the third indentation groove 13 can be selected according to actual conditions, and is not limited to 0.08mm-0.12mm in the embodiment.

[0049] It should be noted that the first indentation groove 11, the second indentation groove 221 and the third indentation groove 13 provided in the embodiment are all protruding ribs added on the mold insert for manufacturing the top cover sheet, which are convenient, have good molding effect and low cost.

[0050] Another purpose of the embodiment is to provide a cylindrical battery 100, which comprises a shell 110, an electric core and the above-mentioned cover plate assembly 120. The shell 110 is internally provided with the electric core, and the cover plate assembly 120 is sealingly arranged on the shell 110, and the pole column on the cover plate assembly 120 is electrically connected to the tab on the electric core to achieve the effect of guiding the internal current to the external power equipment. By arranging the above-mentioned cover plate assembly 120 on the cylindrical battery 100, the production quality and assembly stability of the cylindrical battery 100 can be improved.

[0051] In the description of the specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0052] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not intended to limit the implementation modes of the present disclosure. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present disclosure. Here, it is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the claims of the present disclosure.

Claims

1. A top sheet applied to a cylindrical battery (100), characterized by, The top cover sheet comprises a top cover sheet body (1) and a folded part (2), the outer peripheral surface of the top cover sheet body (1) is provided with the folded part (2), the folded part (2) comprises a flange structure (21) and a folded edge (22), wherein: The flange structure (21) is in a cylindrical shape, surrounds the periphery of the top cover sheet body (1), and points from the top wall of the top cover sheet body (1) to the bottom wall of the top cover sheet body (1), a first indentation groove (11) is arranged between the inner side wall of the flange structure (21) and the top cover sheet body (1), and the first indentation groove (11) is arranged such that when the first indentation groove (11) is formed, the flange structure (21) can be deformed to increase the length of the vertical part of the outer side wall of the flange structure (21). The folded edge (22) surrounds and protrudes from the periphery of the flange structure (21).

2. The cap sheet of claim 1, wherein The depth of the first indentation groove (11) is h1, and 0.08≤h1≤0.12mm.

3. The cap sheet of claim 1, wherein A bevel (12) is arranged between the groove bottom of the first indentation groove (11) and the top cover sheet body (1).

4. The cap sheet of claim 3, wherein The projection length dimension of the bevel (12) on the horizontal plane is m, and 0.3≤m≤0.9mm.

5. The cap sheet according to any one of claims 1-4, characterized in that, In the direction from the bottom wall of the folded edge (22) to the top wall of the folded edge (22), a second indentation groove (221) is concavely arranged at the connection between the folded edge (22) and the outer side wall of the flange structure (21).

6. The cap sheet of claim 5, wherein The depth of the second indentation groove (221) is h2, and 0.05≤h2≤0.1mm.

7. A cover assembly characterized by, The top cover sheet of any one of claims 1-6, wherein the top cover sheet body (1) is provided with a liquid injection groove, the groove bottom of the liquid injection groove is provided with a liquid injection hole, and a liquid injection sealing nail (121) is sealingly inserted into the liquid injection hole and welded to the side wall of the liquid injection groove.

8. The cover plate assembly of claim 7, wherein, In the direction from the bottom wall of the top cover sheet to the top wall of the top cover sheet, a third indentation groove (13) is concavely arranged at the connection between the bottom wall of the top cover sheet body (1) and the side wall of the liquid injection groove, and the third indentation groove (13) is arranged such that when the third indentation groove (13) is formed, the side wall of the liquid injection groove can be deformed to reduce the angle of the chamfer between the inner side wall of the liquid injection groove and the top cover sheet body (1).

9. The cover plate assembly of claim 8, wherein, The depth of the third indentation groove (13) is h3, and 0.08≤h3≤0.12mm.

10. A cylindrical battery characterized by The cover plate assembly (120) of any one of claims 7-9, wherein the housing (110) is internally provided with an electric core, and the cover plate assembly (120) is sealingly arranged on the housing (110).

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