Cover plate assembly and battery monomer with same

Abstract

The cover plate assembly comprises a cover plate, a liquid injection hole penetrating through the cover plate in the thickness direction of the cover plate is formed in the cover plate, the liquid injection hole comprises a first hole section and a second hole section, the first hole section is located on the side, facing an electrode assembly, of the second hole section, and the second hole section is located on the side, facing the electrode assembly, of the second hole section; in a projection plane perpendicular to the thickness direction of the cover plate, the first hole section is positioned on the radial inner side of the second hole section; the sealing nail is in interference fit in the first hole section to seal the first hole section; the sealing cover is arranged in the second hole section and is fixed with the cover plate; the pressing block is arranged in the second hole section, and the pressing block abuts against the position between the sealing nail and the sealing cover in the axial direction of the liquid injection hole. According to the cover plate assembly disclosed by the utility model, by arranging the pressing block, the sealing reliability of the liquid injection hole can be improved, so that the reliability and the safety of the battery monomer are improved.

Description

Technical Field

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

[0002] During the battery production process, electrolyte needs to be added to the battery cell. After the electrolyte is added, a sealing nail is used to seal the injection hole. In the related art, the sealing reliability of the injection hole is poor, thereby reducing the reliability and safety of the battery cell. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a cover plate assembly, the sealing reliability of the liquid injection hole of the cover plate assembly is higher.

[0004] The utility model also provides a battery monomer having the cover plate assembly.

[0005] According to the first aspect of the utility model, the cover plate assembly includes: a cover plate, wherein the cover plate is provided with an injection hole penetrating the cover plate along the thickness direction of the cover plate, the injection hole includes a first hole segment and a second hole segment, the first hole segment is located on the side of the second hole segment facing the electrode assembly, and in a projection plane perpendicular to the thickness direction of the cover plate, the first hole segment is located on the radial inner side of the second hole segment; a sealing pin, wherein the sealing pin is interference fit in the first hole segment to seal the first hole segment; a sealing cover, wherein the sealing cover is arranged in the second hole segment and fixed to the cover plate; a pressing block, wherein the pressing block is arranged in the second hole segment, and in the axial direction of the injection hole, the pressing block abuts between the sealing pin and the sealing cover.

[0006] According to the cover plate assembly of the utility model, by providing the pressing block, the reliability of the sealing of the liquid injection hole can be improved, thereby improving the reliability and safety of the battery cell.

[0007] According to some embodiments of the present invention, a matching groove is formed on a surface of the sealing cover facing the sealing pin, and at least a portion of the pressing block is disposed in the matching groove.

[0008] According to some embodiments of the present invention, the pressing block is a heat insulating member.

[0009] According to some embodiments of the present invention, the pressing block is a ceramic piece or a bakelite piece.

[0010] According to some embodiments of the utility model, the sealing nail includes a nail cap and a nail body, the nail body is connected to one end of the nail cap in the thickness direction, the nail body is fitted in the first hole segment, the nail cap is located in the second hole segment, and the peripheral edge of the nail cap is supported on the peripheral edge of one end where the first hole segment is connected to the second hole segment.

[0011] According to some embodiments of the utility model, a surface of the nail cap on one side facing the nail body and an outer peripheral surface of the nail body are rounded to form a first rounded corner, a bottom wall of the second hole segment facing the first hole segment and a peripheral wall of the first hole segment are rounded to form a second rounded corner, and the first rounded corner and the second rounded corner are adapted and fit together in shape.

[0012] According to some embodiments of the present invention, the radii of the first rounded corner and the second rounded corner are 0.3 mm-0.8 mm.

[0013] According to some embodiments of the utility model, the nail body includes: a sealing section, one end of which is connected to the nail cap, the sealing section is in sealing contact with the inner wall of the first hole section, and the radial dimension of the sealing section decreases in the direction from the nail cap to the nail body; a guide section, the guide section is connected to the other end of the sealing section, the radial dimension of the guide section is smaller than the radial dimension of the sealing section, and a guide cone surface is formed at one end of the guide section away from the sealing section, and the guide cone surface extends obliquely toward the axis of the nail body in the direction from the nail cap to the nail body.

[0014] According to some embodiments of the utility model, a concave groove is formed on a surface of the sealing cover facing away from the sealing pin; or the sealing cover is welded to the cover plate.

[0015] A battery cell according to a second aspect of the present invention comprises the cap plate assembly according to the first aspect of the present invention.

[0016] According to the battery cell of the second aspect of the utility model, by providing the cover plate assembly according to the first aspect of the utility model, the reliability of the battery cell during operation can be improved.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded view of a cover plate assembly according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 A cross-sectional view of the cover plate assembly shown in ;

[0020] Figure 3 yes Figure 2 An enlarged view of A shown in FIG.

[0021] Figure 4 yes Figure 1 Schematic diagram of the sealing nail shown in .

[0022] Reference numerals:

[0023] 100. Cover plate assembly;

[0024] 10. Cover plate; 11. Liquid injection hole; 111. First hole section; 1111. Second chamfer; 112. Second hole section;

[0025] 20. Sealing nail; 21. Nail cap; 22. Nail body; 221. Sealing section; 222. Guide section; 2221. Guide cone surface; 2222. Weight reduction groove; 23. First chamfer;

[0026] 30. Sealing cover; 31. Matching groove; 32. Groove;

[0027] 40. Briquetting. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] Reference below Figure 1-Figure 4 A cover plate assembly 100 according to an embodiment of the first aspect of the present invention is described.

[0030] like Figure 1-Figure 3 As shown, the cover plate assembly 100 according to the first embodiment of the utility model includes: a cover plate 10, a sealing nail 20, a sealing cover 30 and a pressing block 40.

[0031] Specifically, the cover plate 10 is provided with a plurality of Figure 1 The liquid injection hole 11 of the cover plate 10 (in the up-down direction shown in FIG. 1 ) penetrates the cover plate 10. The liquid injection hole 11 includes a first hole segment 111 and a second hole segment 112. The first hole segment 111 is located on a side of the second hole segment 112 facing the electrode assembly (for example, Figure 3), in a projection plane perpendicular to the thickness direction of the cover plate 10, the first hole section 111 is located radially inside the second hole section 112, the sealing pin 20 is interference-fitted in the first hole section 111 to seal the first hole section 111, the sealing cover 30 is disposed in the second hole section 112 and fixed to the cover plate 10, the pressing block 40 is disposed in the second hole section 112, and in the axial direction of the injection hole 11 (e.g. Figure 3 In the up-down direction shown in FIG, the pressing block 40 abuts between the sealing pin 20 and the sealing cover 30.

[0032] During the production process, electrolyte is added to the battery cell through the injection hole 11. After the electrolyte is added, the sealing nail 20 is assembled into the first hole section 111, and then the pressing block 40 is pressed on the sealing nail 20. Subsequently, the sealing cover 30 is placed into the second hole section 112 so that the sealing cover 30 presses the pressing block 40 and fixes the sealing cover 30 to the cover plate 10, thereby completing the sealing of the injection hole 11.

[0033] Among them, the sealing cover 30 can provide protection for the sealing pin 20 to prevent impurities in the external environment from damaging the sealing pin 20. A first hole segment 111 and a second hole segment 112 are set in the injection hole 11. In the projection plane perpendicular to the thickness direction of the cover plate 10, the first hole segment 111 is located radially inside the second hole segment 112, that is, the radial dimension of the first hole segment 111 is smaller than the radial dimension of the second hole segment 112. In this way, the area of ​​the sealing cover 30 can be larger, which can improve the shielding effect of the sealing cover 30 on the pressing block 40 and the sealing pin 20, and in the thickness direction of the cover plate 10, the space occupied by the sealing cover 30 can be reduced, thereby facilitating the arrangement of the cover plate assembly 100.

[0034] The sealing pin 20 is interference fit in the first hole section 111 to seal the first hole section 111. The matching method of the sealing pin 20 and the first hole section 111 is relatively simple. During the assembly process, the sealing pin 20 can be inserted into the first hole section 111 into place to achieve the sealing of the first hole section 111 by the sealing pin 20, thereby improving production efficiency.

[0035] It is understandable that during the use of the battery cell, the cover plate 10 will inevitably vibrate. As the vibration time becomes longer, the sealing nail 20 may loosen in the first hole section 111, thereby affecting the reliability of the sealing of the liquid injection hole 11.

[0036] In this embodiment, a pressure block 40 is provided, and the pressure block 40 abuts between the sealing cover 30 and the sealing pin 20. In this way, when the sealing pin 20 is displaced toward the sealing cover 30 and loosens in the first hole section 111, the pressure block 40 can abut against the sealing pin 20, thereby improving the reliability of the interference fit of the sealing pin 20 in the first hole section 111, and further improving the reliability of the sealing of the injection hole 11.

[0037] According to the cover plate assembly 100 of the first embodiment of the utility model, by providing the pressing block 40, the reliability of the sealing of the liquid injection hole 11 can be improved, thereby improving the reliability and safety of the battery cell.

[0038] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, a mating groove 31 is formed on one side of the sealing cover 30 facing the sealing pin 20, and at least a portion of the pressing block 40 is disposed in the mating groove 31. In this way, when the pressing block 40 is displaced from the sealing pin 20, the inner wall of the mating groove 31 can abut against the pressing block 40 to prevent the displacement of the pressing block 40, thereby improving the reliability of the abutment of the pressing block 40 against the sealing pin 20, and further improving the reliability of the sealing of the injection hole 11. In addition, during the assembly process, the mating groove 31 cooperates with the pressing block 40 to provide positioning, thereby reducing the difficulty of assembly and improving assembly efficiency and assembly accuracy.

[0039] In some embodiments of the utility model, the pressing block 40 is a heat insulating member. During the welding process of the sealing cover 30 and the cover plate 10, a large amount of heat is generated, so that the temperature of the sealing cover 30 is relatively high. By setting the pressing block 40 as a heat insulating member, the heat transferred to the sealing pin 20 can be reduced, thereby preventing the sealing pin 20 from being overheated, causing excessive deformation and sealing failure, thereby improving the product yield.

[0040] In some embodiments of the present invention, the pressing block 40 is a ceramic piece or a bakelite piece. The ceramic piece and the bakelite piece have good thermal insulation performance and high hardness, so that the thermal insulation performance of the pressing block 40 can meet the use requirements and the abutment effect of the pressing block 40 on the sealing nail 20 can be guaranteed.

[0041] In some embodiments of the present invention, Figure 3 and Figure 4As shown, the sealing nail 20 includes a nail cap 21 and a nail body 22. The nail body 22 is connected to one end of the nail cap 21 in the thickness direction. The nail body 22 fits in the first hole section 111. The nail cap 21 is located in the second hole section 112, and the periphery of the nail cap 21 is supported on the periphery of one end of the first hole section 111 connected to the second hole section 112. During assembly, when the sealing nail 20 is assembled in place in the first hole section 111, the periphery of the nail cap 21 and the end of the first hole section 111 connected to the second hole section 112 abut against each other. In this way, the sealing nail 20 can be prevented from passing through the first hole section 111 and entering the battery cell, and the operator can more easily know whether the sealing nail 20 is assembled in place. At the same time, the nail cap 21 can also seal the first hole section 111, thereby further improving the sealing reliability of the injection hole 11. In addition, the nail cap 21 can increase the contact area between the sealing nail 20 and the pressure block 40, so that the force exerted by the pressure block 40 on the sealing nail 20 is more uniform, and then the degree of abutment between the sealing nail 20 and the inner wall of the first hole section 111 is more uniform, further improving the sealing reliability of the injection hole 11.

[0042] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the side surface of the nail cap 21 facing the nail body 22 and the outer peripheral surface of the nail body 22 are rounded to form a first rounded corner, and the bottom wall of the second hole section 112 facing the first hole section 111 and the peripheral wall of the first hole section 111 are rounded to form a second rounded corner, and the first rounded corner and the second rounded corner are adapted and fit. In this way, the contact area between the sealing nail 20 and the first hole section 111 can be increased, and the first rounded corner section of the sealing nail 20 and the second rounded corner section of the injection hole 11 can be abutted in multiple directions to achieve sealing. When a gap appears between the portion of the nail body 22 extending along the thickness of the cover plate 10 and the first hole section 111, the first rounded corner section of the sealing nail 20 and the second rounded corner section of the injection hole 11 can also cooperate to achieve sealing of the injection hole 11, thereby further improving the reliability of the sealing of the injection hole 11.

[0043] In some embodiments of the present invention, the radius of the first fillet and the second fillet is 0.3mm-0.8mm. For example, the radius of the first fillet and the second fillet can be 0.3mm, 0.5mm, 0.6mm, 0.65mm or 0.8mm, so that the sealing effect of the sealing nail 20 on the injection hole 11 can meet the use requirements, and the peripheral edge of one end of the first hole section 111 connected to the second hole section 112 can better support the sealing nail 20, so as to prevent the sealing nail 20 from entering the battery cell from the first hole section 111 when the battery cell is in normal working state.

[0044] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the nail body 22 includes a sealing section 221 and a guide section 222 .

[0045] Specifically, one end of the sealing segment 221 is connected to the nail cap 21, and the sealing segment 221 is sealingly abutted against the inner wall of the first hole segment 111. In the direction from the nail cap 21 to the nail body 22, the radial dimension of the sealing segment 221 decreases. The guide segment 222 is connected to the other end of the sealing segment 221. The radial dimension of the guide segment 222 is smaller than the radial dimension of the sealing segment 221. A guide cone surface 2221 is formed at one end of the guide segment 222 away from the sealing segment 221. In the direction from the nail cap 21 to the nail body 22, the guide cone surface 2221 extends obliquely toward the axis of the nail body 22.

[0046] In this way, during the assembly process, the guide cone surface 2221 of the guide section 222 can be easily extended into the first hole section 111. Under the guidance of the guide cone surface 2221 and the guide section 222, the sealing section 221 can be extended into the first hole section 111 more easily, thereby reducing the difficulty of assembly and improving the assembly efficiency. Among them, in the direction from the nail cap 21 to the nail body 22, the radial dimension of the sealing section 221 is reduced, which can further reduce the difficulty of installing the sealing section 221 into the first hole section 111, and can increase the abutment surface between the sealing section 221 and the first hole section 111, thereby further improving the sealing reliability of the injection hole 11.

[0047] In some embodiments of the present invention, Figure 4 As shown, the guide segment 222 is formed with a plurality of weight-reducing grooves 2222. For example, the number of the weight-reducing grooves 2222 may be two, three or four. The plurality of weight-reducing grooves 2222 are arranged at intervals around the axis of the guide segment 222. By providing the weight-reducing grooves 2222, the weight of the sealing nail 20 can be reduced, and the production materials of the sealing nail 20 can be saved, which is beneficial to achieving lightweight battery cells and reducing production costs.

[0048] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, a concave groove 32 is formed on the surface of the sealing cover 30 facing away from the sealing pin 20, or the sealing cover 30 is welded to the cover plate 10. The groove 32 can release the thermal stress of the sealing cover 30 during welding, reduce the deformation degree of the sealing cover 30 during welding, and improve the yield rate. In addition, one side wall of the groove 32 can be formed as the side wall of the matching groove 31. During the production process, one side wall of the groove 32 can be integrally formed with the matching groove 31, thereby reducing the number of steps in the production process, reducing production costs, and improving production efficiency. The welding connection between the sealing cover 30 and the cover plate 10 can ensure the reliability of the connection between the sealing cover 30 and the cover plate 10, and can realize the sealing connection between the sealing cover 30 and the cover plate 10. In this way, the sealing cover 30 can also realize the sealing of the injection hole 11, thereby further improving the sealing reliability of the injection hole 11.

[0049] The battery cell according to the embodiment of the second aspect of the utility model includes the cap plate assembly 100 according to the embodiment of the first aspect of the utility model.

[0050] The battery cell according to the second embodiment of the present invention can improve reliability and safety by providing the cap plate assembly 100 according to the first embodiment of the present invention.

[0051] In some embodiments of the utility model, the battery cell further includes: a shell and an electrode assembly, the shell is formed with an installation cavity, the installation cavity has an opening, the cover plate assembly 100 is covered on the opening, and the electrode assembly is arranged in the installation cavity. By providing the shell, the shell can provide support for the components in the battery cell and isolate the components in the battery cell from the outside, so that the battery cell can work normally, and by providing the electrode assembly, the electrode assembly can realize the charging and discharging functions of the battery cell.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that: include: a cover plate, the cover plate being provided with a liquid injection hole penetrating the cover plate along a thickness direction of the cover plate, the liquid injection hole comprising a first hole segment and a second hole segment, the first hole segment being located on a side of the second hole segment facing the electrode assembly, and the first hole segment being located radially inward of the second hole segment in a projection plane perpendicular to the thickness direction of the cover plate; a sealing pin, the sealing pin being interference-fitted in the first hole section to seal the first hole section; a sealing cover, the sealing cover being disposed in the second hole section and fixed to the cover plate; A pressing block is provided in the second hole segment, and in the axial direction of the liquid injection hole, the pressing block abuts between the sealing pin and the sealing cover.

2. The cover plate assembly according to claim 1, wherein: A matching groove is formed on a surface of the sealing cover facing the sealing pin, and at least a portion of the pressing block is disposed in the matching groove.

3. The cover plate assembly according to claim 1, wherein: The pressing block is a heat insulating member.

4. The cover plate assembly according to claim 3, wherein: The pressing block is a ceramic piece or a bakelite piece.

5. The cover plate assembly according to claim 1, wherein: The sealing nail includes a nail cap and a nail body, the nail body is connected to one end of the nail cap in the thickness direction, the nail body is fitted into the first hole segment, the nail cap is located in the second hole segment, and the peripheral edge of the nail cap is supported on the peripheral edge of one end connecting the first hole segment and the second hole segment.

6. The cover plate assembly according to claim 5, wherein: The corner between the side surface of the nail cap facing the nail body and the outer peripheral surface of the nail body is rounded to form a first rounded corner, and the corner between the bottom wall of the second hole segment facing the first hole segment and the peripheral wall of the first hole segment is rounded to form a second rounded corner, and the first rounded corner and the second rounded corner are adapted and fit together.

7. The cover plate assembly according to claim 6, wherein: The radii of the first rounded corner and the second rounded corner are 0.3 mm to 0.8 mm.

8. The cover plate assembly according to claim 5, wherein: The nail body comprises: a sealing segment, one end of which is connected to the nail cap, the sealing segment sealingly abutting against the inner wall of the first hole segment, and the radial dimension of the sealing segment decreasing in the direction from the nail cap to the nail body; A guide segment, wherein the guide segment is connected to the other end of the sealing segment, the radial dimension of the guide segment is smaller than the radial dimension of the sealing segment, and a guide cone surface is formed at one end of the guide segment away from the sealing segment, and in the direction from the nail cap to the nail body, the guide cone surface extends obliquely toward the axis of the nail body.

9. The cover plate assembly according to claim 1, wherein: A concave groove is formed on a surface of the sealing cover facing away from the sealing pin; or the sealing cover is welded to the cover plate.

10. A battery cell, characterized in that: The invention comprises a cover plate assembly according to any one of claims 1 to 9.

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