End cover assembly, battery monomer and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides an end cover assembly, a battery monomer and electric equipment. The end cover assembly comprises a first pole and a first connecting piece, the first connecting piece is provided with a first surface and a second surface which are oppositely arranged in the thickness direction of the first connecting piece, the first surface is provided with a mounting groove, and the first pole is welded in the mounting groove. The first pole is welded in the mounting groove of the first connecting piece, and at least part of the first connecting piece and at least part of the first pole share a space in the thickness direction of the first connecting piece. The overall thickness of the end cover assembly is reduced while the thickness of the first connecting piece is not reduced and the first connecting piece is ensured to have high overcurrent capacity, so that the energy density of the single battery adopting the end cover assembly is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an end cover assembly, a battery cell and electrical equipment. Background Art

[0002] At present, battery cells generally include square battery cells, cylindrical battery cells and soft-pack battery cells, etc. In general, a square battery cell includes a shell, a battery cell and an end cover assembly. One end of the shell is open to form an opening, and the battery cell is accommodated in the shell. The end cover assembly is sealed and connected to the shell to seal the opening. The end cover assembly includes a cover plate, a positive electrode column, a negative electrode column, a positive electrode connecting piece and a negative electrode connecting piece. The positive electrode column and the negative electrode column are both mounted on the cover plate. One side of the positive electrode connecting piece is used to weld the positive ears of the two battery cells, and the other side of the positive electrode connecting piece is used to weld with the positive electrode column. One side of the negative electrode connecting piece is used to weld the negative ears of the two battery cells, and the other side of the negative electrode connecting piece is used to weld with the negative electrode column. However, the connecting piece in the prior art will take up more internal space of the battery cell, increase the height of the battery cell, and cause the energy density of the battery cell to decrease. Utility Model Content

[0003] The purpose of the utility model is to provide an end cover assembly, a battery cell and an electrical device, aiming to solve the technical problem of low energy density of existing battery cells.

[0004] In a first aspect, the present application provides an end cover assembly, comprising a first pole and a first connecting piece, wherein the first connecting piece has a first surface and a second surface arranged opposite to each other in its thickness direction, and an installation groove is provided on the first surface, and the first pole is welded in the installation groove.

[0005] The end cap assembly provided by the present invention has the following beneficial effects: In the prior art, the pole is directly welded to the top surface of the connecting piece. In contrast, in the present application, the first pole is welded within the mounting groove of the first connecting piece. In the thickness direction of the first connecting piece, at least a portion of the first connecting piece and at least a portion of the first pole share space. This reduces the overall thickness of the end cap assembly while ensuring high current flow capacity without reducing the thickness of the first connecting piece, effectively increasing the energy density of the battery cell incorporating the present end cap assembly.

[0006] Optionally, the mounting groove passes through at least one side of the first connecting piece in a horizontal direction, and the horizontal direction is perpendicular to a thickness direction of the first connecting piece.

[0007] Optionally, the mounting groove passes through two opposite sides of the first connecting piece in the horizontal direction.

[0008] Optionally, the mounting groove extends through the second surface.

[0009] Optionally, the first pole is welded to a wall surface of the installation groove.

[0010] Optionally, the end cover assembly further includes a cover plate and a lower insulating structure, the first pole passes through the cover plate, the lower insulating structure is located between the first connecting plate and the cover plate, the surface of the lower insulating structure facing away from the cover plate protrudes to form a first boss, the first pole passes through the lower insulating structure and the first boss, wherein the shape of the mounting groove is adapted to the outer shape of the first boss to position the first boss.

[0011] Optionally, the mounting groove includes a first groove section and a second groove section, the first groove section is located on the side of the second groove section close to the cover plate, the second groove section passes through the second surface, and in the thickness direction of the first connecting piece, the projection of the first groove section covers the projection of the second groove section. The shape of the first groove section is adapted to the shape of the first boss, and the first pole is welded to the wall of the second groove section.

[0012] Optionally, the end cover assembly also includes a second connecting plate and a second pole passing through the cover plate, the second connecting plate is located on the side of the lower insulating structure away from the cover plate, the second pole is welded to the second connecting plate, the overcurrent coefficient of the first connecting plate is smaller than the overcurrent coefficient of the second connecting plate, and the thickness of the first connecting plate is greater than the thickness of the second connecting plate.

[0013] Optionally, the cross section of the mounting groove is rectangular, elliptical or polygonal.

[0014] In a second aspect, the present application provides a battery cell comprising the above-mentioned end cover assembly.

[0015] In a third aspect, the present application provides an electrical device comprising the above-mentioned battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 A cross-sectional view of a battery cell provided by an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 A magnified view of middle A;

[0019] Figure 3 A schematic structural diagram of a first connecting piece provided in an embodiment of the present utility model;

[0020] Figure 4 Another structural schematic diagram of the first connecting piece provided in an embodiment of the present utility model;

[0021] Figure 5 Another structural schematic diagram of the first connecting piece provided in an embodiment of the present utility model;

[0022] Figure 6 This is an exploded view of the end cover assembly provided in an embodiment of the present utility model.

[0023] Among them, the reference numerals in the figures are:

[0024] 100. End cap assembly; 10. Cover plate; 20. First pole;

[0025] 30. Second pole; 40. First connecting piece; 50. Second connecting piece;

[0026] 60. Lower insulation structure; 70. First upper plastic; 80. Second upper plastic;

[0027] 11. First mounting hole; 12. Second mounting hole; 41. First surface;

[0028] 42. Second surface; 43. Mounting groove; 431. First groove section;

[0029] 432, second slot section; 61, first lower plastic; 62, second lower plastic;

[0030] 611, first boss; 612, first receiving groove; 621, second receiving groove;

[0031] 200. Battery cell; 201. Battery casing; 202. Electrode assembly. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present invention, examples of which 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 explain the present invention, and should not be construed as limiting the present invention.

[0033] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout this specification, not all references are to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0036] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0037] Please refer to Figures 1 to 6 Now, the end cover assembly 100, the battery cell 200 and the electrical equipment in the embodiment of the present invention are described.

[0038] Please refer to Figure 1 The thickness direction of the first connecting piece 40 is parallel to the Z axis, and the length direction of the end cover assembly 100 is parallel to the X axis.

[0039] Please refer to Figure 1 The present application provides a battery cell 200 comprising an end cap assembly 100, a housing 201, and an electrode assembly 202. The housing 201 has a mounting cavity with one end open, and the electrode assembly 202 is accommodated within the mounting cavity. The electrode assembly 202 is the component within the battery cell 200 where the electrochemical reaction occurs. The end cap assembly 100 is hermetically connected to the housing 201 to seal the mounting cavity.

[0040] In order to solve the technical problem of low energy density of the existing battery cell 200, the present application improves the end cap assembly 100.

[0041] Please refer to Figure 1 and Figure 3The present application provides an end cap assembly 100 including a first electrode 20 and a first connecting piece 40. The first connecting piece 40 has a first surface 41 and a second surface 42 disposed opposite to each other in its thickness direction. The first surface 41 defines a mounting groove 43, into which the first electrode 20 is welded. Specifically, the surface of the first connecting piece 40 away from the electrode assembly 202 is the first surface 41, and the surface of the first connecting piece 40 close to the electrode assembly 202 is the second surface 42.

[0042] In the prior art, the pole is directly welded to the top surface of the connecting piece. In the present application, the first pole 20 is welded within the mounting groove 43 of the first connecting piece 40. In the thickness direction of the first connecting piece 40, at least a portion of the first connecting piece 40 and at least a portion of the first pole 20 share space. Without reducing the thickness of the first connecting piece 40, while ensuring that the first connecting piece 40 has a large flow capacity, the overall thickness of the end cap assembly 100 is reduced. Since the thickness direction of the first connecting piece 40 is the height direction of the battery cell 200, reducing the overall thickness of the end cap assembly 100 can reduce the height of the battery cell 200, thereby increasing the energy density of the battery cell 200.

[0043] It should be noted that the thicker the connecting piece is, the stronger its current-carrying capacity is.

[0044] In another embodiment of this application, please refer to Figure 3 The mounting groove 43 extends through at least one side of the first connecting piece 40 in the horizontal direction, with the horizontal direction being perpendicular to the thickness direction of the first connecting piece 40. This arrangement not only meets the requirement of lightweighting the first connecting piece 40, but also allows the battery cell 200 using the end cap assembly 100 to be filled with more electrolyte.

[0045] In some embodiments, please refer to Figure 4 The mounting groove 43 passes through two opposite sides of the first connecting piece 40 in the horizontal direction. This arrangement can further reduce the weight of the first connecting piece 40 and can also further fill more electrolyte inside the battery cell 200 using the end cap assembly 100.

[0046] It is understood that the horizontal direction may be parallel to the length direction of the end cap assembly 100, may be parallel to the width direction of the end cap assembly 100, or may be inclined to the length direction of the end cap assembly 100, and is not limited here. In this embodiment, specifically, the horizontal direction is parallel to the length direction of the end cap assembly 100.

[0047] In another embodiment of this application, please refer to Figure 5The mounting groove 43 extends through the second surface 42. This configuration allows the first terminal 20 to be inserted deeper into the mounting groove 43. That is, in the thickness direction of the first connecting piece 40, the space shared by the first connecting piece 40 and the first terminal 20 is larger, which can further improve the energy density of the battery cell 200.

[0048] In another embodiment of the present application, if the mounting groove 43 extends through the second surface 42 of the first connecting piece 40, the first pole 20 is welded to the wall of the mounting groove 43. This ensures a sufficient welding area between the first pole 20 and the first connecting piece 40, thereby improving welding quality.

[0049] It is understandable that if the installation groove 43 does not penetrate the second surface 42 of the first connecting piece 40 , the first pole 20 may be welded to the bottom wall of the installation groove 43 .

[0050] In some embodiments, the surface of the first electrode post 20 close to the electrode assembly 202 is flush with the second surface 42 of the first connecting tab 40 , so as to further improve the energy density of the battery cell 200 .

[0051] In another embodiment of this application, please refer to Figure 6 The end cover assembly 100 also includes a cover plate 10 and a lower insulating structure 60. The first pole 20 passes through the cover plate 10. The lower insulating structure 60 is located between the first connecting piece 40 and the cover plate 10. The surface of the lower insulating structure 60 facing away from the cover plate 10 protrudes to form a first boss 611. The first pole 20 passes through the lower insulating structure 60 and the first boss 611, wherein the shape of the mounting groove 43 is adapted to the outer shape of the first boss 611 to position the first boss 611.

[0052] Specifically, a first mounting hole 11 is provided on the cover plate 10, and the first mounting hole 11 passes through the cover plate 10 along the thickness direction of the cover plate 10, and the first pole 20 passes through the first mounting hole 11. A first accommodating groove 612 is provided on the surface of the first boss 611 away from the cover plate 10, and the first accommodating groove 612 passes through the first boss 611 and the lower insulating structure 60 along the thickness direction of the lower insulating structure 60, and the first pole 20 is accommodated in the first accommodating groove 612. The lower insulating structure 60 is used for insulation to prevent the first pole 20 from being electrically connected to the cover plate 10. The shape of the mounting groove 43 is adapted to the shape of the first boss 611, which means that the shape of the mounting groove 43 is the same as the shape of the first boss 611, and the two can be plugged into each other. For example, when the mounting groove 43 is circular, the first boss 611 is also circular. The provision of the first boss 611 can improve the installation accuracy of the first connecting piece 40 , thereby improving the welding quality between the first connecting piece 40 and the first pole 20 , and improving the welding quality between the first connecting piece 40 and the tab of the electrode assembly 202 .

[0053] In another embodiment of this application, please refer to Figure 5 The mounting groove 43 includes a first groove section 431 and a second groove section 432. The first groove section 431 is located on the side of the second groove section 432 closest to the cover plate 10, while the second groove section 432 extends through the second surface 42. In the thickness direction of the first connecting piece 40, the projection of the first groove section 431 overlaps the projection of the second groove section 432. The shape of the first groove section 431 matches the profile of the first boss 611, and the first terminal 20 is welded to the wall of the second groove section 432. In this embodiment, the second groove section 432 extends through the second surface 42. As previously described, this effectively improves the energy density of the battery cell 200. The first terminal 20 is welded to the wall of the second groove section 432. By matching the shape of the first groove section 431 with the profile of the first boss 611, the installation accuracy of the first connecting piece 40 can be effectively improved.

[0054] In another embodiment of the present application, the cross-section of the mounting groove 43 is rectangular, elliptical, or polygonal. Because the shape of the mounting groove 43 matches the outer shape of the first boss 611, the outer shape of the first boss 611 is also rectangular, elliptical, or polygonal. In this embodiment, the cross-section of the mounting groove 43 is rectangular, and the outer shape of the first boss 611 is rectangular. This arrangement prevents relative rotation between the first connecting piece 40 and the first terminal 20 during welding, thereby improving the welding quality.

[0055] In another embodiment of this application, please refer to Figure 6 The end cap assembly 100 further includes a second connecting piece 50 and a second pole 30 that penetrates the cover plate 10. The second connecting piece 50 is located on the side of the lower insulating structure 60 facing away from the cover plate 10. The second pole 30 is welded to the second connecting piece 50. Specifically, the cover plate 10 is provided with a second mounting hole 12 that penetrates the cover plate 10 along its thickness. The second pole 30 passes through the second mounting hole 12. The polarity of the first pole 20 is opposite to that of the second pole 30.

[0056] It is understood that in some embodiments, the first electrode 20 is a positive electrode, the first connecting piece 40 is a positive electrode connecting piece, the second electrode 30 is a negative electrode, and the second connecting piece 50 is a negative electrode connecting piece. In other embodiments, the first electrode 20 may be a negative electrode, the second connecting piece 50 may be a negative electrode, the second electrode 30 may be a positive electrode, and the second connecting piece 50 may be a positive electrode, and this is not limited here.

[0057] In addition, the surface of the second connecting piece 50 close to the cover plate 10 can be provided with a mounting groove 43 for accommodating the second pole 30, or the surface of the second connecting piece 50 close to the cover plate 10 can also be provided with the above-mentioned mounting groove 43, that is, the surface of the second connecting piece 50 close to the cover plate 10 is a continuous plane.

[0058] Furthermore, if the second connecting piece 50 is provided with a mounting groove 43 for accommodating the second pole 30, the structure of the mounting groove 43 on the second connecting piece 50 can be the same as the structure of the mounting groove 43 on the first connecting piece 40. Of course, the structures of the two can also be different. That is, in some embodiments, the mounting groove 43 on the first connecting piece 40 passes through the surface of the first connecting piece 40 away from the cover plate 10, while the mounting groove 43 on the second connecting piece 50 does not pass through the surface of the second connecting piece 50 away from the cover plate 10. In other embodiments, the mounting groove 43 on the first connecting piece 40 passes through the surface of the first connecting piece 40 away from the cover plate 10, while the mounting groove 43 on the second connecting piece 50 also passes through the surface of the second connecting piece 50 away from the cover plate 10, so this is not limited here.

[0059] In this embodiment, the flow coefficient of the first connecting plate 40 is smaller than that of the second connecting plate 50, and the thickness of the first connecting plate 40 is greater than that of the second connecting plate 50. Specifically, the first terminal 20 is a positive terminal and is made of aluminum, with the first connecting plate 40 being the positive electrode connecting plate. The second terminal 30 is a negative terminal and is made of copper, with the second connecting plate 50 being the negative electrode connecting plate. To facilitate welding between the first terminal 20 and the first connecting plate 40, the first connecting plate 40 is made of aluminum. To facilitate welding between the second terminal 30 and the second connecting plate 50, the second connecting plate 50 is made of copper. Because the flow coefficient of aluminum is smaller than that of copper, the thickness of the first connecting plate 40 is configured to be greater than that of the second connecting plate 50. This ensures that the flow capacity of the first connecting plate 40 and the second connecting plate 50 is equal, thereby ensuring the performance of the battery cell 200.

[0060] It is understandable that the lower insulating structure 60 can be an integrated structure or a split structure, which is not limited here. Figure 6 The lower insulating structure 60 is a split structure. Specifically, the lower insulating structure 60 includes a first lower plastic 61 and a second lower plastic 62. A first boss 611 is provided on the first lower plastic 61, and a first receiving groove 612 passes through the first boss 611 and the first lower plastic 61. A second receiving groove 621 is provided on the second lower plastic 62. The second receiving groove 621 passes through the second lower plastic 62 along the thickness direction of the second lower plastic 62, and the second pole 30 is received in the second receiving groove 621. Because plastic parts are easily deformed after molding, if the lower insulating structure 60 is a one-piece structure, the center distance between the first receiving groove 612 and the second receiving groove 621 will easily change, making it difficult to assemble the lower insulating structure 60 with the cover plate 10. By configuring the lower insulating structure 60 as a split structure, the above problem can be solved.

[0061] In some embodiments, please refer to Figure 6The end cap assembly 100 also includes a first upper plastic member 70 and a second upper plastic member 80. Both the first upper plastic member 70 and the second upper plastic member 80 are disposed on the side of the cover plate 10 facing away from the lower insulating structure 60. The first upper plastic member 70 is located in the first mounting hole 11. The first pole 20 is passed through the first upper plastic member 70. The first upper plastic member 70 and the first lower plastic member 61 together clamp the first pole 20, providing insulation. The second upper plastic member 80 is located in the second mounting hole 12. The second upper plastic member 80 is passed through the second pole 30. The second upper plastic member 80 and the second lower plastic member 62 together clamp the second pole 30, also providing insulation.

[0062] In summary, the battery cell 200 provided in the present application effectively improves the energy density of the battery cell 200 due to the adoption of the above-mentioned end cover assembly 100 .

[0063] The present application also provides an electrical device that utilizes the aforementioned battery cell 200. The electrical device may include, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and the like. The electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the spacecraft may include airplanes, rockets, space shuttles, and spacecraft, among others.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An end cap assembly, characterized in that: include: a first pole (20); The first connecting piece (40) has a first surface (41) and a second surface (42) arranged opposite to each other in its thickness direction; the first surface (41) is provided with a mounting groove (43); and the first pole (20) is welded in the mounting groove (43).

2. The end cap assembly according to claim 1, wherein: The mounting groove (43) passes through at least one side of the first connecting piece (40) in a horizontal direction, and the horizontal direction is perpendicular to the thickness direction of the first connecting piece (40).

3. The end cap assembly according to claim 2, wherein: The mounting groove (43) passes through two opposite sides of the first connecting piece (40) in the horizontal direction.

4. The end cap assembly according to claim 1, wherein: The mounting groove (43) extends through the second surface (42).

5. The end cap assembly according to claim 4, wherein: The first pole (20) is welded to the wall surface of the installation groove (43).

6. The end cap assembly according to any one of claims 1 to 5, characterized in that: Also includes: a cover plate (10), wherein the first pole (20) passes through the cover plate (10); a lower insulating structure (60) located between the first connecting piece (40) and the cover plate (10); a surface of the lower insulating structure (60) facing away from the cover plate (10) protrudes to form a first boss (611); and the first pole (20) passes through the lower insulating structure (60) and the first boss (611); The shape of the mounting groove (43) is adapted to the outer shape of the first boss (611) so as to position the first boss (611).

7. The end cap assembly according to claim 6, wherein: The mounting groove (43) comprises a first groove section (431) and a second groove section (432), wherein the first groove section (431) is located on a side of the second groove section (432) close to the cover plate (10), and the second groove section (432) passes through the second surface (42). In the thickness direction of the first connecting piece (40), the projection of the first groove section (431) covers the projection of the second groove section (432), the shape of the first groove section (431) is adapted to the outer shape of the first boss (611), and the first pole (20) is welded to the wall surface of the second groove section (432).

8. The end cap assembly according to claim 6, wherein: The end cover assembly (100) further comprises a second connecting piece (50) and a second pole (30) passing through the cover plate (10), the second connecting piece (50) being located on a side of the lower insulating structure (60) facing away from the cover plate (10), the second pole (30) being welded to the second connecting piece (50), the overflow coefficient of the first connecting piece (40) being smaller than the overflow coefficient of the second connecting piece (50), and the thickness of the first connecting piece (40) being larger than the thickness of the second connecting piece (50); and / or, The cross section of the mounting groove (43) is rectangular, elliptical or polygonal.

9. A battery cell, characterized in that: The invention comprises the end cover assembly (100) according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The invention comprises the battery cell (200) according to claim 9.

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