Offset battery cell and cover plate assembly

Abstract

The utility model discloses an offset type battery cell and cover plate assembly, and belongs to the technical field of lithium battery manufacturing. The offset type battery cell comprises a cover plate assembly and a laminated core, wherein a tab of the laminated core is arranged on one side of the laminated core in an offset manner; the cover plate assembly comprises a cover plate main body and a cover plate connecting sheet, the cover plate main body is respectively provided with a terminal connecting hole and a sealing hole, an external terminal assembly is arranged in the terminal connecting hole, and the sealing hole is arranged corresponding to the position of a tab of a battery cell; the cover plate connecting sheet is positioned on the inner side of the cover plate main body, two ends of the cover plate connecting sheet respectively extend to the terminal connecting hole and the sealing hole, the outer side of one end of the cover plate connecting sheet is connected with a terminal assembly positioned in the terminal connecting hole, and the inner side of the other end of the cover plate connecting sheet is connected with a tab of a battery cell. Compared with a traditional connection mode from the battery cell to the tab, the scheme adopts an offset connection mode, so that the height between the tab and the cover plate terminal assembly is reduced, and the internal space loss of the battery cell is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, and more specifically, to a biased battery core and a cover plate assembly. Background Art

[0002] With the process of economic globalization and the continuous increase in energy demand, the pursuit of new energy storage units has quickly become the focus of attention in the field of new energy. Lithium-ion batteries, which have the advantages of no memory effect, low self-discharge, high energy density, long cycle life, clean and pollution-free, have begun to be widely used in electric and hybrid vehicles and portable mobile power sources. As the core energy storage unit, the development of batteries has attracted much attention.

[0003] The terminals, rivets and other components of traditional cover plates are mostly designed to be centered, or the terminals, rivets and the cell tabs and tab connectors of the cover plates are located in the same axial space. When the connector is bent, it is bent inside the cell and located under the cover plate rivets. This structure is prone to cause loss of space inside the cell and is not conducive to improving the energy density of the cell. Moreover, this method requires high bending technology for the tabs and tab connectors. Utility Model Content

[0004] The utility model provides an offset type battery cell and a cover plate assembly, wherein the cover plate assembly is provided with a terminal connection hole and a sealing hole respectively, and the two ends of the cover plate connecting piece extend to the terminal connection hole and the sealing hole respectively, and the pole ear of the battery cell is offset on one side of the stacked core, and the pole ear is connected to the terminal assembly located in the terminal connection hole through the cover plate connecting piece, thereby reducing the internal space loss of the battery cell.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0006] A cover plate assembly, comprising:

[0007] A cover plate body, on which a terminal connection hole and a sealing hole are respectively provided, wherein an external terminal assembly is arranged in the terminal connection hole, and the sealing hole is arranged corresponding to the position of the tab of the battery cell;

[0008] The cover plate connecting piece is located on the inner side of the cover plate body, and its two ends extend to the terminal connection hole and the sealing hole respectively. The outer side of one end is connected to the terminal assembly located in the terminal connection hole, and the inner side of the other end is used to connect to the pole ear of the battery cell.

[0009] Furthermore, an external connection end is provided at one end of the cover plate connecting piece for connecting with the pole lug, and the external connection end faces the outside of the cover plate connecting piece.

[0010] Furthermore, an insulating plate is installed in the sealing hole, a through hole is provided on the insulating plate, and the external connection end passes through the through hole to the outside of the insulating plate and is bent.

[0011] Furthermore, one side of the insulating plate is recessed toward the other side to form a groove, the through hole is located at a side of the groove, and when the external connection end is bent, it is bent into the groove.

[0012] Furthermore, the side wall of the sealing hole is stepped for mating connection with the insulating plate.

[0013] Furthermore, a sealing plate is installed on the outer side of the insulating plate, and the sealing plate is used to seal the sealing hole.

[0014] The utility model also provides a biased battery cell, comprising:

[0015] The cover plate assembly;

[0016] The stacked core, wherein the tab is biased to one side of the stacked core;

[0017] The cover plate assembly is located at one end of the stacked core, and the cover plate connecting piece is used to connect to the inner side of the pole lug of the battery cell.

[0018] Furthermore, the pole lug is also connected to a pole lug connecting piece, and the cover plate connecting piece is connected to the pole lug via the pole lug connecting piece.

[0019] Furthermore, the tab connecting piece is L-shaped, including a tab connecting end and a bent connecting end connected together; the tab connecting end is connected to the tab, and the bent connecting end is connected to the cover plate connecting piece; and the bent connecting end passes through the cover plate body and extends to its outside.

[0020] Furthermore, a stop frame is provided between the cover plate assembly and the stacked core, and the stop frame is used to fix the cover plate connecting piece and the tab connecting piece.

[0021] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0022] (1) The utility model provides an offset type battery cell and cover plate assembly, wherein the cover plate body is provided with a terminal connection hole and a sealing hole, respectively, and the two ends of the cover plate connecting piece extend to the terminal connection hole and the sealing hole, respectively, the outer side of one end is connected to the terminal assembly located in the terminal connection hole, and the inner side of the other end is used to connect to the tab of the battery cell. The tab of the stacked core is offset to one side of the stacked core. Compared with the traditional connection method of the battery cell to the tab, the offset connection method is adopted, which reduces the height between the tab and the cover plate terminal assembly, and reduces the internal space loss of the battery cell.

[0023] (2) The utility model provides an offset battery cell and cover plate assembly, in which the bent connection end of the pole tab connecting piece and the external connection end of the cover plate connecting piece extend to the outside of the cover plate body for welding and bending, which makes it easier to operate the welding and bending of the cover plate connecting piece and the pole tab connecting piece, thereby increasing the operability of the welding and bending of the cover plate connecting piece and the pole tab connecting piece.

[0024] (3) The utility model provides an offset battery cell and cover plate assembly, wherein the bent connection end of the tab connecting piece and the external connection end of the cover plate connecting piece extend to the outside of the cover plate body for bending. After bending, the cover plate connecting piece and the tab connecting piece do not occupy the space inside the battery cell, thereby further reducing the space loss inside the battery cell.

[0025] (4) The utility model provides an offset battery cell and cover plate assembly, in which an insulating plate is installed in a sealing hole, and one side of the insulating plate is recessed toward the other side to form a groove. When the external connection end is bent, it is bent into the groove, so that the bent external connection end further reduces the space occupied on the outside of the battery cell, thereby increasing the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a view of the cover assembly from the outside;

[0027] Figure 2 This is a view of the cover assembly from the inside;

[0028] Figure 3 It is a schematic diagram of the structure of the cover plate connecting piece;

[0029] Figure 4 It is an exploded view of the cover assembly and the stop frame;

[0030] Figure 5a It is a schematic diagram of the connection between the battery cell and the tab connector;

[0031] Figure 5b Schematic diagram of the stop frame for assembling the battery cell;

[0032] Figure 5c Schematic diagram of assembling the cover assembly for the battery cell;

[0033] Figure 5d It is a schematic diagram of the tab connecting piece and the cover connecting piece after bending;

[0034] Figure 5e Schematic diagram of the sealing plate for battery cell assembly.

[0035] Description of labels:

[0036] 1. Cover plate body; 10. Sealing hole; 2. Insulating plate; 21. Through hole; 3. Cover plate connecting piece; 31. External connection end; 32. Terminal connection end; 4. Tab connecting piece; 41. Tab connection end; 42. Bending connection end; 5. Sealing plate; 6. Stop frame; 7. Tab; 8. Terminal assembly. DETAILED DESCRIPTION

[0037] The present invention will be described in detail with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0038] like Figure 1 and Figure 2 As shown, this embodiment provides a cover assembly, including a cover body 1 and a cover connecting piece 3. The cover body 1 is provided with a terminal connection hole and a sealing hole 10, and an external terminal assembly 8 is arranged in the terminal connection hole. The sealing hole 10 is arranged corresponding to the position of the pole ear 7 of the battery cell. The terminal assembly 8 includes a rivet and a terminal, which is used to connect the pole ear 7 externally.

[0039] The cover connecting piece 3 is located on the inner side of the cover body 1, and the two ends of the cover connecting piece 3 extend to the terminal connection hole and the sealing hole 10 respectively. One end of the cover connecting piece 3 serves as the terminal connection end 32, and its outer side is connected to the terminal assembly 8 located in the terminal connection hole, and the inner side of the other end is used to connect with the pole ear 7 of the battery cell, so as to conduct the terminal assembly 8 with the pole ear 7.

[0040] like Figure 1 As shown, in this embodiment, the inner side is the side close to the battery cell, and the outer side is the side away from the battery cell.

[0041] like Figure 3 As shown, one end of the cover plate connecting piece 3 for connecting with the pole ear 7 is provided with an external connection end 31, and the external connection end 31 faces the outside of the cover plate connecting piece 3. In this embodiment, two external connection ends 31 are provided, which are respectively located on both sides of the cover plate connecting piece 3.

[0042] like Figure 4 As shown, an insulating plate 2 is installed in the sealing hole 10, a through hole 21 is provided on the insulating plate 2, and the external connection end 31 passes through the through hole 21 to the outside of the insulating plate 2 and is bent. One side of the insulating plate 2 is recessed toward the other side to form a groove, and the through hole 21 is located on one side of the groove. When the external connection end 31 is bent, it is bent into the groove. The side wall of the sealing hole 10 is stepped, and is used to cooperate with the insulating plate 2. A sealing plate 5 is installed on the outside of the insulating plate 2, and the sealing plate 5 is used to seal the sealing hole 10.

[0043] The utility model also provides a biased electric core, comprising a stacked core and the above-mentioned cover plate assembly.

[0044] The stacked core in this embodiment is a double stacked core, and the double stacked core leads to two pole ears 7. In other embodiments, a single stacked core or multiple stacked cores can also be provided, and the cover plate connecting piece 3 is provided according to the number of stacked cores.

[0045] like Figure 5a-Figure 5e As shown, in this embodiment, the pole ear 7 is offset to one side of the stacked core, and the cover plate assembly is located at one end of the stacked core, wherein the cover plate connecting piece 3 is used to connect to the inner side of the pole ear 7 of the battery cell and to the pole ear 7 .

[0046] Each pole lug 7 is also connected to a pole lug connecting piece 4, and the cover plate connecting piece 3 is connected to the pole lug 7 through the pole lug connecting piece 4. Specifically, the pole lug connecting piece 4 is L-shaped, including a pole lug connecting end 41 and a bent connecting end 42 connected together. The pole lug connecting end 41 is connected to the pole lug 7, and the bent connecting end 42 is connected to the cover plate connecting piece 3; and the bent connecting end 42 passes through the cover plate body 1 and extends to the outside thereof.

[0047] In this embodiment, the bent connection end 42 is specifically connected to the external connection end 31 on the cover plate connection sheet 3, and passes through the through hole 21 together with the external connection end 31 to the outside of the insulating plate 2, and is bent together into the groove of the insulating plate 2. After the bent connection end 42 is connected to the external connection end 31, the end of the bent connection end 42 is flush with the end of the external connection end 31.

[0048] A stop frame 6 is also provided between the cover plate assembly and the stacked core, and the stop frame 6 is used to fix the cover plate connecting piece 3 and the tab connecting piece 4.

[0049] Recombination Figure 5a-Figure 5e As shown, first see Figure 5a The stacked core is a double stacked core, the pole lug 7 is offset to one side of the stacked core and symmetrically gathered in two clusters, the pole lug connecting piece 4 is initially L-shaped, and two pole lug connecting pieces 4 are provided, and the pole lug connecting end 41 of each pole lug connecting piece 4 is respectively connected to the pole lug 7 by ultrasonic welding, and the two pole lugs 7 are bent in a direction close to each other.

[0050] See Figure 5b , install the stop frame 6 , and the bent connecting end 42 of the pole ear connecting piece 4 passes through the stop frame 6 and extends to the other side of the stop frame 6 .

[0051] See Figure 5c , install the cover plate assembly. The bent connection end 42 passes through the through hole 21 of the insulating plate 2 and is closely connected to the external connection end 31 of the cover plate connecting piece 3 .

[0052] See Figure 5dThe bent connection end 42 and the external connection end 31 are bent together into the groove of the insulating plate 2. The insulating plate 2 is provided with a groove for accommodating the bent bent connection end 42 and the external connection end 31, which can better save space and better insulate the bent connection end 42 and the external connection end 31 from the cover plate body 1.

[0053] The tab connecting piece 4 is bent into a Z shape, and the stop frame 6 can fix and limit the bent cover plate connecting piece 3 and the tab connecting piece 4 .

[0054] See Figure 5e The sealing plate 5 is installed at the sealing hole 10, and the sealing hole 10 is sealed by welding the surrounding of the sealing plate 5.

[0055] The position of the pole lug 7 of the battery cell in this embodiment is completely staggered with the position of the terminal assembly 8 for external connection on the cover assembly, which is different from the traditional method in which the pole lug 7 and the terminal assembly 8 are located on the same axis. In this solution, a conductive path between the pole lug 7-pole lug connecting piece 4-cover connecting piece 3-terminal assembly 8 is formed through the pole lug connecting piece 4 and the cover connecting piece 3. The position of the pole lug 7 and the terminal assembly 8 is staggered, which reduces the space of the battery cell in the height direction after the pole lug 7 and the terminal assembly 8 are connected as in the traditional method. Moreover, the bent connection end 42 of the pole lug connecting piece 4 in this embodiment and the external connection end 31 of the cover connecting piece 3 are led out to the outside of the cover body 1 for welding and bending, which saves the internal space of the battery cell, and increases the operability and operable space of the bending and welding process of the connecting piece, making it easier to weld and bend.

[0056] The bent connection end 42 and the external connection end 31 pass through the through hole 21 of the insulating plate 2 and are bent together into the groove of the insulating plate 2, and are located within the thickness space of the cover plate body 1, thereby reducing the thickness of the cover plate assembly and reducing the space occupied by the cover plate assembly.

[0057] The pole lug 7 is connected to the cover plate connecting piece 3 via the pole lug connecting piece 4 and finally connected to the terminal assembly 8 , thereby reducing the length setting of the pole lug 7 .

[0058] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the 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.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The protection scope of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will easily recognize that alternative structures to the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate body (1) is provided with a terminal connection hole and a sealing hole (10) respectively, wherein an external terminal assembly (8) is arranged in the terminal connection hole, and the sealing hole (10) is arranged corresponding to the position of the pole ear (7) of the battery cell; The cover plate connecting piece (3) is located on the inner side of the cover plate body (1), and its two ends extend to the terminal connection hole and the sealing hole (10) respectively. The outer side of one end is connected to the terminal assembly (8) located in the terminal connection hole, and the inner side of the other end is used to connect to the pole ear (7) of the battery cell.

2. The cover plate assembly according to claim 1, characterized in that: An end of the cover plate connecting piece (3) used for connecting to the pole lug (7) is provided with an external connection end (31), and the external connection end (31) faces the outside of the cover plate connecting piece (3).

3. The cover plate assembly according to claim 2, characterized in that: An insulating plate (2) is installed in the sealing hole (10), a through hole (21) is provided on the insulating plate (2), and the external connection end (31) passes through the through hole (21) to the outside of the insulating plate (2) and is bent.

4. The cover plate assembly according to claim 3, characterized in that: One side of the insulating plate (2) is recessed in a direction toward the other side to form a groove, the through hole (21) is located at the side of the groove, and when the external connection end (31) is bent, it is bent into the groove.

5. The cover plate assembly according to claim 3, characterized in that: The side wall of the sealing hole (10) is stepped and is used for matching and connecting with the insulating plate (2).

6. The cover plate assembly according to claim 3, 4 or 5, characterized in that: A sealing plate (5) is installed on the outer side of the insulating plate (2), and the sealing plate (5) is used to seal the sealing hole (10).

7. A biased battery cell, characterized in that: include, The cover plate assembly according to any one of claims 1 to 6; The stacked core, the pole ear (7) is offset to one side of the stacked core; The cover plate assembly is located at one end of the stacked core, and the cover plate connecting piece (3) is used to connect to the inner side of the pole lug (7) of the battery cell.

8. The biased battery cell according to claim 7, characterized in that: The pole lug (7) is also connected to a pole lug connecting piece (4), and the cover plate connecting piece (3) is connected to the pole lug (7) via the pole lug connecting piece (4).

9. The biased battery cell according to claim 8, characterized in that: The pole lug connecting piece (4) is L-shaped, and comprises a pole lug connecting end (41) and a bent connecting end (42) connected together; the pole lug connecting end (41) is connected to the pole lug (7), and the bent connecting end (42) is connected to the cover plate connecting piece (3); and the bent connecting end (42) passes through the cover plate body (1) and extends to the outside thereof.

10. The biased battery cell according to claim 8, characterized in that: A stop frame (6) is also provided between the cover plate assembly and the stacked core, and the stop frame (6) is used to fix the cover plate connecting piece (3) and the tab connecting piece (4).

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