Pin structure, cover plate assembly and battery

Abstract

The utility model provides a pin structure, cover plate subassembly and battery, pin structure includes first connecting part and second connecting part, first connecting part includes main part and mounting part that connect mutually, main part and second connecting part are laminated in the first direction, mounting part at least partially protrudes the second connecting part in the second direction; wherein the mounting part comprises a tab connecting side close to the second connecting part in the first direction, and the tab connecting side is configured to be used for mounting a tab; according to the embodiment of the invention, the space between the tab connecting side on the pin structure and the battery cell can be increased, so that the risk that the tab is inversely inserted into the battery cell after being assembled with the pin structure is reduced.

Description

Technical Field

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

[0002] In related technology, the pins on the top cover of a power battery are ultrasonically welded to the positive and negative tabs of the bare cell, allowing the bare cell current to be conducted from the inside of the cell to the outside. Typically, the top cover pins consist of a positive pin and a negative pin. After the tabs are welded, the welding area between the tabs and the pins is bent inward or outward to flatten the pins, facilitating the cell placement process.

[0003] In the horizontal assembly space of the battery, bending the welding area between the tab and the pin inward can occupy less horizontal assembly space, but the space between the welding area between the tab and the pin on the pin and the bare battery cell is too small, and there is a risk of the tab being inserted upside down into the bare battery cell. Utility Model Content

[0004] The embodiments of the present invention provide a pin structure, a cover plate assembly and a battery, which can increase the space between the tab on the pin and the welding area of ​​the pin and the bare battery cell, so as to improve the technical problem of the tab being inserted upside down into the bare battery cell.

[0005] In a first aspect, an embodiment of the present invention provides a pin structure, including a tab connection portion, the tab connection portion including a first connection portion and a second connection portion, the first connection portion including a main body portion and a mounting portion connected to each other, the main body portion and the second connection portion being stacked in a first direction, at least a portion of the mounting portion protruding from the second connection portion in a second direction, the first direction and the second direction intersecting;

[0006] The mounting portion includes a tab connection side close to the second connection portion in the first direction, and the tab connection side is configured for mounting the tab.

[0007] In one embodiment, at least a portion of the second connecting portion is hollowed out to form a receiving space, and the receiving space is configured to accommodate the tab;

[0008] The connection side of the tab is exposed from the receiving space.

[0009] In one embodiment, the mounting portion is bendably connected to the main body.

[0010] In one embodiment, the first connecting portion further includes a bending portion, and the bending portion can be bent;

[0011] Wherein, the mounting portion is connected to the main body portion through the bending portion.

[0012] In one embodiment, at least a portion of the main body is spaced apart from the mounting portion in the third direction to form a gap, and the first direction and the second direction are respectively perpendicular to the third direction.

[0013] In one embodiment, the slit extends along the second direction to the interior of the main body.

[0014] In one embodiment, the pin structure further includes a pole connecting portion, which is configured to be connected to the pole;

[0015] Wherein, at least one of the main body portion and the second connecting portion is connected to the pole connecting portion.

[0016] In one embodiment, the pole connection portion includes a third connection portion and a fourth connection portion stacked in a third direction, and the first direction and the second direction are respectively perpendicular to the third direction;

[0017] The third connection part is connected to the main body, and the fourth connection part is connected to the second connection part.

[0018] In one embodiment, the first connection portion, the second connection portion, the third connection portion, and the fourth connection portion are integrally formed.

[0019] In one embodiment, the main body portion and the second connecting portion are connected by welding;

[0020] The penetration of the welding between the main body portion and the second connecting portion is greater than the thickness of the main body portion or the second connecting portion in the first direction.

[0021] In one embodiment, the main body portion and the second connecting portion have the same thickness in the first direction;

[0022] The thickness of the main body in the first direction is defined as D, and the penetration of the main body and the second connecting part is defined as H; wherein D and H satisfy: 1.1D≤H≤2D.

[0023] In one embodiment, the tab connection portion further includes a retaining portion connected to at least one of the main body portion and the second connection portion.

[0024] In a second aspect, an embodiment of the present invention provides a cover plate assembly, comprising:

[0025] A top cover, wherein a pole is provided on the top cover;

[0026] Pin structure, the pin structure is connected to the pole.

[0027] In a third aspect, an embodiment of the present invention provides a battery, comprising:

[0028] A core package, on which a tab is provided; and

[0029] Cover assembly;

[0030] The tab is fixed on the tab connection side of the mounting portion.

[0031] Beneficial effects of the embodiments of the present utility model:

[0032] In the technical solution of the present invention, by providing a stacked main body and a second connecting portion, after the pin structure and the tab on the battery cell are assembled, the second connecting portion separates the first connecting portion and the battery cell, so that there is a certain space between the mounting portion and the battery cell, thereby providing a certain accommodation space for the tab after the tab is connected to the tab connection side on the mounting portion. Compared with the related art, the embodiment of the present application can increase the space between the tab connection side on the pin structure and the battery cell, so as to reduce the risk of the tab being inserted upside down into the battery cell after being assembled with the pin structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a three-dimensional schematic diagram of the pin structure provided by an embodiment of the present utility model;

[0035] Figure 2 This is a schematic structural diagram of a pin structure provided by an embodiment of the present utility model;

[0036] Figure 3 This is a structural schematic diagram of the pin structure provided by an embodiment of the present utility model from another perspective;

[0037] Figure 4 This is a three-dimensional schematic diagram of the pin structure provided by an embodiment of the present utility model in a bent state;

[0038] Figure 5 This is a three-dimensional schematic diagram of the pin structure provided by an embodiment of the present utility model in a bent state from another perspective;

[0039] Figure 6 This is a three-dimensional schematic diagram of the pin structure provided by an embodiment of the present utility model;

[0040] Figure 7 It is a partial cross-sectional schematic diagram of the pin structure provided by an embodiment of the utility model.

[0041] Description of reference numerals:

[0042] 1. Tab connection part; 11. First connection part; 111. Main body; 112. Mounting part; 113. Bending part; 12. Second connection part; 13. Holding part; 2. Tab connection side; 3. Accommodation space; 4. Gap; 5. Pole connection part; 51. Third connection part; 52. Fourth connection part. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0044] This application proposes a pin structure. Figures 1 to 7 These are some embodiments of the present application. As shown in the accompanying drawings, the X direction is the first direction, the Y direction is the second direction, and the Z direction is the third direction. The first direction and the second direction intersect, and both the first direction and the second direction are perpendicular to the third direction. The following description will be based on the first direction X, the second direction Y, and the third direction Z.

[0045] See also Figures 1 to 3 In some embodiments of the present application, the pin structure includes a tab connection portion 1, the tab connection portion 1 includes a first connection portion 11 and a second connection portion 12, the first connection portion 11 includes a main body portion 111 and a mounting portion 112 connected to each other, the main body portion 111 and the second connection portion 12 are stacked in a first direction X, and at least a portion of the mounting portion 112 protrudes from the second connection portion 12 in a second direction Y; when the pin structure is connected to the tab on the battery cell, the second connection portion 12 faces the battery cell, and the first connection portion 11 is located on the side of the second connection portion 12 away from the battery cell in the first direction X, so that there is a space between the mounting portion 112 and the battery cell.

[0046] Among them, the mounting portion 112 includes a tab connection side 2 close to the second connection portion 12 in the first direction X, and the tab connection side 2 is configured for tab installation; after the pin structure and the battery cell are assembled, the tab on the battery cell is located in the space between the mounting portion 112 and the battery cell, that is, the space between the mounting portion 112 and the battery cell can provide a certain accommodation space for the tab, so as to reduce the risk of the tab being inserted upside down into the battery cell due to the small space between the tab connection side 2 on the mounting portion 112 and the battery cell after the pin structure and the battery cell are assembled.

[0047] In the technical solution of the present invention, by providing a stacked main body portion 111 and a second connecting portion 12, after the pin structure and the tab on the battery cell are assembled, the second connecting portion 12 separates the first connecting portion 11 and the battery cell, so that there is a certain space between the mounting portion 112 and the battery cell, thereby providing a certain accommodation space for the tab after the tab is connected to the tab connection side 2 on the mounting portion 112. Compared with the related art, the embodiment of the present application can increase the space between the tab connection side 2 on the pin structure and the battery cell, so as to reduce the risk of the tab being inserted upside down into the battery cell after being assembled with the pin structure.

[0048] It should be supplemented that, in the embodiment of the present application, at least a portion of the mounting portion 112 protrudes from the first connecting portion 11 in the second direction Y, including the following two situations:

[0049] In one embodiment of the present application, the main body 111 and the second connecting portion 12 are opposite to each other and stacked in the first direction X, and the installation portion 112 is located at a position protruding from the periphery of the first connecting portion 11; at this time, the structure of the second connecting portion 12 will not be processed or adjusted.

[0050] In another embodiment of the present application, the main body 111 and the mounting portion 112 may be arranged opposite to and stacked with the second connection portion 12 in the first direction X, so that part of the second connection portion 12 needs to be hollowed out so that the mounting portion 112 will not be blocked by the second connection portion 12; at this time, the second connection portion 12 is processed and adjusted.

[0051] In some embodiments of the present application, the main body 111 and the second connecting portion 12 both extend along the third direction Z, and the mounting portion 112 is connected to one side of the main body 111 in the second direction Y.

[0052] In addition, the tab connection portion 1 is also connected to the pole so as to conduct the cell current from the inside of the cell to the outside of the cell.

[0053] Please refer again Figures 1 to 3In some embodiments of the present application, at least a portion of the second connecting portion 12 is hollowed out to form a receiving space 3, and the receiving space 3 is configured to accommodate the pole ear; that is, in this embodiment, the main body 111 and the mounting portion 112 are both opposite to the second connecting portion 12 in the first direction X and are stacked, and a portion of the second connecting portion 12 is hollowed out so that the pole ear connection side 2 on the mounting portion 112 is not blocked by the second connecting portion 12, and the space between the pole ear connection side 2 on the mounting portion 112 and the battery cell is the receiving space 3. The receiving space 3 can provide a receiving space for the pole ear after the pin structure and the battery cell are assembled, so as to reduce the risk of the pole ear being inserted upside down into the battery cell after being assembled with the pin structure.

[0054] See also Figures 3 to 5 In some embodiments of the present application, the mounting portion 112 can be bent and connected to the main body 111; that is, in this embodiment, the mounting portion 112 can be bent to Figures 4 and 5 In the state shown, at this time, the mounting portion 112 extends along the first direction X, the tab extends from the core package along the first direction X, and the tab and the tab connection side 2 on the mounting portion 112 are opposite in the second direction Y, so that it is convenient for the operator or the operating tool to weld the tab to the tab connection side 2. After completing the welding of the mounting portion 112 and the tab, the mounting portion 112 is bent to the position shown in FIG. Figure 3 The state shown in FIG. 1 is shown, thereby preventing the pin structure from occupying too much lateral assembly space in the battery; at this time, the tab welded on the tab connection side 2 is located in the receiving space 3, thereby reducing the risk of the tab being inserted upside down into the battery cell after being assembled with the pin structure.

[0055] In some embodiments of the present application, the first connecting portion 11 also includes a bending portion 113, which can be bent, and the mounting portion 112 is connected to the main body 111 through the bending portion 113; that is, the mounting portion 112 is connected to the main body 111 through the bending portion 113 to achieve an angle bending of the mounting portion 112 relative to the main body 111.

[0056] In some embodiments of the present application, at least a portion of the main body 111 is spaced apart from the mounting portion 112 in the third direction Z to form a gap 4; that is, in this embodiment, the setting of the gap 4 makes there is only one connection between the main body 111 and the mounting portion 112, that is, the mounting portion 112 is connected to the main body 111 through the bending portion 113, so that the main body 111 will not interfere with the bending movement of the mounting portion 112.

[0057] In some embodiments of the present application, the first connecting portion 11 is arranged in a rectangular shape. By providing a gap 4 on the first connecting portion 11, a main body portion 111, a mounting portion 112 and a bending portion 113 can be formed at the same time to simplify the processing steps of the pin structure.

[0058] In some embodiments of the present application, the gap extends along the second direction Y to the interior of the main body; such a configuration can reduce the stress concentration of the bending portion 113 when bending, and avoid the phenomenon of tearing at the end of the boundary line between the bending portion 113 and the main body 111 when bending.

[0059] Among them, the positional relationship between the opening position of the slit 4 and the second connecting portion 12 is not restricted. In one embodiment, the position at which the slit 4 is provided on the main body 111 is opposite to the second connecting portion 12 in the first direction X; in another embodiment, the position at which the slit 4 is provided on the main body 111 is located at the portion of the main body 111 protruding from the periphery of the second connecting portion 12 in the second direction Y, that is, the position at which the slit 4 is provided on the main body 111 is not opposite to the second connecting portion 12 in the first direction X.

[0060] See also Figure 2 In some embodiments of the present application, the position where the slit 4 is provided on the main body 111 is opposite to the second connecting portion 12 in the first direction X. In this manner, the size of the second connecting portion 12 in the second direction Y can be increased while the size of the main body 111 in the second direction Y remains unchanged, thereby enhancing the current flow capacity of the tab connecting portion 1.

[0061] In some embodiments of the present application, the pin structure further includes a post connection portion 5, which is configured to connect to a post; wherein at least one of the main body 111 and the second connection portion 12 is connected to the post connection portion 5; that is, in this embodiment, the tab connection portion 1 is connected to the post through the post connection portion 5 to conduct the cell current from the inside of the cell to the outside of the cell. In one embodiment, either the main body 111 or the second connection portion 12 may be directly connected to the post connection portion 5; in another embodiment, both the main body 111 and the second connection portion 12 may be connected to the post connection portion 5.

[0062] See also Figure 6 In some embodiments of the present application, the pole connecting portion 5 extends along the first direction X, and one end of the main body 111 and the second connecting portion 12 in the second direction Y is connected to one end of the pole connecting portion 5 in the first direction X.

[0063] In some embodiments of the present application, the pole connection portion 5 includes a third connection portion 51 and a fourth connection portion 52 stacked in the third direction Z; wherein the third connection portion 51 is connected to the main body portion 111, and the fourth connection portion 52 is connected to the second connection portion 12; that is, in this embodiment, the third connection portion 51 and the first connection portion 11 are integrally arranged, and the fourth connection portion 52 and the second connection portion 12 are integrally arranged. When assembling to form the pole ear structure, the plate composed of the third connection portion 51 and the first connection portion 11 and the plate composed of the fourth connection portion 52 and the second connection portion 12 are overlapped and bent and cut to form a plate as shown in FIG. Figure 6 The pin structure is shown.

[0064] In some embodiments of the present application, the first connecting portion 11, the second connecting portion 12, the third connecting portion 51 and the fourth connecting portion 52 are integrally formed; that is, in this embodiment, the plate composed of the first connecting portion 11, the second connecting portion 12, the third connecting portion 51 and the fourth connecting portion 52 is laminated once and then bent and cut to form the following. Figure 6 The pin structure shown in FIG. 1 is a schematic diagram of a pin structure in which the first connecting portion 11 , the second connecting portion 12 , the third connecting portion 51 and the fourth connecting portion 52 are integrally formed, thereby simplifying the production process and improving the production efficiency and material utilization of the pin structure.

[0065] In addition, the pin structure in the embodiment of the present application is integrally formed, and the third connecting portion 51 and the fourth connecting portion 52 always remain connected at one end away from the first connecting portion 11 and the second connecting portion 12 in the first direction X. The connection points between the main body 111 and the second connecting portion 12, and the third connecting portion 51 and the fourth connecting portion 52 can also be reduced to effectively simplify the production process.

[0066] It should be noted that since the pin structure in the embodiment of the present application is a double-layer material stack, that is, the first connection part 11 and the third connection part 51, the second connection part 12 and the fourth connection part 52 are stacked, the flow area of ​​the pin structure is increased.

[0067] In addition, since the first connecting portion 11 is arranged in a rectangular shape as a whole, there is a gap between one end of the bending portion 113 in the third direction Z and the main body 111, and the size of the part of the main body 111 connected to the bending portion 113 in the second direction Y is smaller than the size of the part of the main body 111 not connected to the bending portion 113 in the second direction Y, so the current flow capacity of the main body 111 is relatively weak, but in this application, a second connecting portion 12 is provided to be stacked with the main body 111, so that the current can be conducted to the pole through the main body 111 and the second connecting portion 12 at the same time, thereby increasing the current flow capacity of the pole ear connecting portion 1.

[0068] See also Figures 6 and 7In some embodiments of the present application, the main body 111 and the second connecting portion 12 are welded together; that is, in this embodiment, the main body 111 and the second connecting portion 12 are welded to each other so that the main body 111 and the second connecting portion 12 are firmly fixed to each other. At the same time, since the main body 111 and the second connecting portion 12 are welded to each other, the contact impedance between the main body 111 and the second connecting portion 12 can be reduced.

[0069] Among them, the penetration depth of the welding between the main body 111 and the second connecting part 12 is greater than the thickness of the main body 111 or the second connecting part 12 in the first direction X; in this embodiment, it is ensured that the penetration depth of the welding between the main body 111 and the second connecting part 12 is greater than the thickness of the main body 111 or the second connecting part 12 in the first direction X, so that the main body 111 and the second connecting part 12 can be firmly fixed.

[0070] See also Figure 6 , Figure 6 Point A in the middle is the welding position of the main body 111 and the second connecting part 12. The welding position of the main body 111 and the second connecting part 12 is far away from the edges of the main body 111 and the second connecting part 12 to avoid deformation between the main body 111 and the second connecting part 12 during welding; and welding the main body 111 and the second connecting part 12 at point A can also avoid the risk of deformation of the tab connecting part 1 due to the full-surface welding of the main body 111 and the second connecting part 12.

[0071] It is understandable that the welding position of the main body 111 and the second connecting portion 12 is not limited to Figure 6 Point A in the figure can be adjusted in actual production.

[0072] In addition, no welding is performed between the third connection portion 51 and the fourth connection portion 52 to avoid unevenness after welding between the third connection portion 51 and the fourth connection portion 52 and thus affecting the installation of the pole connection portion 5 and the pole.

[0073] See also Figure 7 In some embodiments of the present application, the thickness of the main body 111 and the second connecting portion 12 in the first direction X is equal; the thickness of the main body 111 in the first direction X is D, and the penetration depth of the welding between the main body 111 and the second connecting portion 12 is H; wherein D and H satisfy: 1.1D≤H≤2D. In this embodiment, the penetration depth H of the welding between the main body 111 and the second connecting portion 12 and the thickness D of the main body 111 are designed to satisfy the range of 1.1D≤H≤2D to ensure a secure weld between the main body 111 and the second connecting portion 12. If the H value is less than 1.1D, there may be a risk of an unreliable weld between the main body 111 and the second connecting portion 12. At the same time, due to the material thickness limitation of the main body 111 and the second connecting portion 12 in the first direction X, H is also less than or equal to 2D.

[0074] In some embodiments of the present application, the tab connector 1 further includes a retaining portion 13, which is connected to at least one of the main body 111 and the second connecting portion 12. The retaining portion 13 is designed to facilitate clamping of the lead structure with a fixture, thereby allowing for machining of the lead structure. In one embodiment, the retaining portion 13 is connected to either the main body 111 or the second connecting portion 12 and is integrally formed with the corresponding main body 111 or second connecting portion 12. In another embodiment, the retaining portion 13 is connected to both the main body 111 and the second connecting portion 12.

[0075] The present invention also proposes a cover assembly, which includes a top cover and a pin structure. The top cover is provided with a pole, and the pin structure is as described above. Since the cover assembly adopts all the technical solutions of all the above embodiments, it has at least the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0076] The present invention further provides a battery comprising a core pack and a cover plate assembly, wherein the core pack is provided with a tab, and the cover plate assembly is as described above; wherein the tab is fixed to the tab connection side 2 of the mounting portion 112. Because this battery utilizes all the technical solutions of all the above embodiments, it at least has the beneficial effects brought about by the technical solutions of the above embodiments, which will not be detailed here.

[0077] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A pin structure, characterized in that: The tab connection portion includes a first connection portion and a second connection portion, the first connection portion includes a main body portion and a mounting portion connected to each other, the main body portion and the second connection portion are stacked in a first direction, at least a portion of the mounting portion protrudes from the second connection portion in a second direction, and the first direction intersects the second direction; The mounting portion includes a tab connection side close to the second connection portion in the first direction, and the tab connection side is configured for tab installation.

2. The pin structure according to claim 1, characterized in that: At least a portion of the second connecting portion is hollowed out to form a receiving space, and the receiving space is configured to accommodate the tab; Wherein, the tab connection side is exposed from the accommodating space.

3. The pin structure according to claim 1 or 2, characterized in that: The mounting portion is bendably connected to the main body portion.

4. The pin structure according to claim 3, characterized in that: The first connecting portion further includes a bending portion, and the bending portion can be bent; Wherein, the mounting portion is connected to the main body portion through the bending portion.

5. The pin structure according to claim 4, characterized in that: At least a portion of the main body is spaced apart from the mounting portion in a third direction to form a gap, and the first direction and the second direction are respectively perpendicular to the third direction.

6. The pin structure according to claim 5, characterized in that: The slit extends along the second direction to the interior of the main body.

7. The pin structure according to claim 1 or 2, characterized in that: The pin structure further includes a pole connecting portion, wherein the pole connecting portion is configured to be connected to the pole; Wherein, at least one of the main body and the second connecting portion is connected to the pole connecting portion.

8. The pin structure according to claim 7, characterized in that: The pole connecting portion includes a third connecting portion and a fourth connecting portion stacked in a third direction, wherein the first direction and the second direction are respectively perpendicular to the third direction; Wherein, the third connecting portion is connected to the main body, and the fourth connecting portion is connected to the second connecting portion.

9. The pin structure according to claim 8, characterized in that: The first connection portion, the second connection portion, the third connection portion, and the fourth connection portion are integrally formed.

10. The pin structure according to claim 1 or 2, characterized in that: The main body portion and the second connecting portion are welded; The penetration depth of welding between the main body portion and the second connecting portion is greater than the thickness of the main body portion or the second connecting portion in the first direction.

11. The pin structure according to claim 10, characterized in that: The main body portion and the second connecting portion have the same thickness in the first direction; The thickness of the main body in the first direction is defined as D, and the penetration of the main body and the second connecting portion is defined as H; wherein D and H satisfy: 1.1D≤H≤2D.

12. The pin structure according to claim 1 or 2, characterized in that: The tab connection portion further includes a holding portion connected to at least one of the main body portion and the second connection portion.

13. A cover plate assembly, characterized in that: include: A top cover, wherein a pole is provided on the top cover; The pin structure according to any one of claims 1 to 12, wherein the pin structure is connected to the pole.

14. A battery, characterized in that: include: A core package, wherein the core package is provided with a tab; and The cover plate assembly according to claim 13; Wherein, the tab is fixed on the tab connection side of the mounting portion.

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