Battery cell pole

Abstract

The utility model relates to a battery cell pole, and belongs to the field of power lithium batteries and energy storage lithium batteries. The battery cell pole comprises a connecting part, the connecting part comprises a pole body, one end of the pole body is provided with a welding surface, the welding surface is connected with a Busbar busbar, one end, far away from the welding surface, of the pole body is compressed with a sealing body, and the interior of the pole body is connected with a tab or an adapter plate; the end, provided with the welding face, of the column body is fixedly connected with a fixing ring, and the welding face of the column body is exposed at the in-ring hollow-out position of the fixing ring. The end, provided with the welding face, of the column body is fixedly connected with the fixing ring through an insulating ring. According to the utility model, through the arrangement of the connecting part, the tabs or the adapter sheets and the Busbar busbars are sequentially connected from inside to outside, so that the penetration of the battery cell poles from inside to outside is realized, riveting structures are reduced, the internal resistance of pole connection is reduced, the rate capability is improved, and meanwhile, the heat generated by overcurrent of the poles is reduced, and the self consumption of the battery cell is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of power lithium batteries and energy storage lithium batteries, and particularly relates to a battery core pole. Background Art

[0002] Power batteries usually include multiple independent storage units, namely cells. The cell is usually composed of a cover assembly, a shell and a core encapsulated in the shell. The core is used to store electrical energy. The cover assembly is mainly responsible for exporting the electrical energy stored in the core to the outside of the cell, and sealing the cell shell and ensuring the insulation between the circuit and the cell shell to ensure the safe output of current. Usually, positive and negative electrodes are arranged on the cover assembly of the cell, and the positive and negative pole ears of the core are respectively connected to the positive and negative electrodes of the cover assembly, and the current is output through the positive and negative electrodes of the cover assembly. The traditional cell cover is formed by riveting rivets and rivet blocks. The pole ears of the core are connected to the rivets through connecting sheets. The current flows from the core to the rivets, and from the rivets to the rivet blocks. The module bus of the power battery is welded to the rivet blocks of multiple cells. The current flowing out of the cell electrodes flows to the module bus via the rivet blocks, and the power battery outputs electrical energy through the bus. Since the rivet and the rivet block are connected by riveting, the connection internal resistance of the pole is large, which makes the battery cell self-consumption too large. Therefore, it is necessary to provide a battery cell pole with smaller internal resistance. Utility Model Content

[0003] In view of the above problems, the utility model provides a battery cell pole.

[0004] The utility model aims to provide a battery pole, comprising a connecting portion, wherein the connecting portion comprises a column, one end of the column is provided with a welding surface, the welding surface is connected to a busbar, one end of the column away from the welding surface is compressed with a sealing body, and a pole ear or a transfer sheet is connected inside the column;

[0005] One end of the column provided with a welding surface is fixedly connected to a fixing ring, and the welding surface of the column is exposed in the hollow portion of the fixing ring.

[0006] Furthermore, the sealing body is ring-shaped.

[0007] Furthermore, the sealing body is square.

[0008] Furthermore, the length of the column is 1-5 mm.

[0009] Furthermore, the column is made of pure aluminum or a copper-aluminum composite material.

[0010] Furthermore, one end of the column provided with a welding surface is fixedly connected to the fixing ring via an insulating ring;

[0011] One end of the insulating ring matches with one end of the column provided with a welding surface, and the other end is embedded in the fixing ring.

[0012] Furthermore, a rotation stopper is provided on the side wall of the column;

[0013] The outer periphery of the insulating ring is provided with a groove body matched with the anti-rotation body.

[0014] Furthermore, an extension portion is provided on the peripheral side of one end of the sealing body close to the column;

[0015] One end of the sealing body away from the column is connected to the base body;

[0016] The base is provided with a groove matched with the extension part.

[0017] Furthermore, the compression amount of the sealing body is at least 1%.

[0018] Furthermore, the outer periphery of the fixing ring is fixed to the base body by laser welding.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a battery pole, which connects the pole ear or the adapter and the busbar from the inside to the outside in sequence through the setting of the connection part, so as to realize the connection of the battery pole from the inside to the outside, reduce the riveting structure, reduce the internal resistance of the pole connection, improve the rate performance, reduce the overcurrent heat generation of the pole, and reduce the self-consumption of the battery cell;

[0021] The combination of the fixing ring, the insulating ring and the connecting part column fixes the cell pole, preventing the rotation of the components of the cell technology during subsequent use. At the same time, the cooperation of the fixing ring and the insulating ring not only realizes the fixing function, but also retains the welding function of the connecting part and the busbar, as well as the safety during welding (setting of the insulator);

[0022] The sealing and insulation of the entire battery cell pole are ensured by combining the fixing ring, the connecting part column, the sealing body and the base body.

[0023] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a battery cell pole according to an embodiment of the utility model is shown;

[0026] Figure 2 A top view of a battery cell pole according to an embodiment of the utility model is shown;

[0027] Figure 3 A cross-sectional view of an assembled battery cell pole according to an embodiment of the utility model is shown;

[0028] In the figure: 10, fixing ring; 20, insulating ring; 30, connecting part; 31, column; 32, anti-rotation body; 40, sealing body; 50, base body. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be understood that terms such as "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] like Figure 1 As shown, a battery cell pole according to an embodiment of the utility model includes a connecting portion 30, wherein the connecting portion 30 includes a column 31, one end of the column 31 is provided with a welding surface, and the welding surface is connected to the busbar busbar, and the end of the column 31 away from the welding surface is compressed with a sealing body 40,

[0032] The column 31 is internally connected to a tab or a switching piece;

[0033] One end of the column 31 provided with a welding surface is fixedly connected to the fixing ring 10, and the fixing of the fixing ring 10 ensures the compression amount of the sealing body 40 by the column 30;

[0034] The welding surface of the column 31 is exposed in the hollow part of the fixing ring 10, and the welding surface is kept connected with the busbar. Figure 2 shown.

[0035] In the embodiment of the present utility model, illustratively, the column 31 is a cylinder.

[0036] In the embodiment of the utility model, the length of the column 31 is 1-5 mm; the column 31 is made of pure aluminum or a copper-aluminum composite material.

[0037] In some embodiments of the present invention, one end of the column 31 provided with a welding surface is fixedly connected to the fixing ring 10 via an insulating ring 20;

[0038] One end of the insulating ring 20 matches with one end of the column 31 provided with a welding surface, and the other end is embedded in the fixing ring 10;

[0039] In this embodiment, the column 31 is a cylinder. In order to cooperate with the column 31, illustratively, the insulating ring 20 is configured as a ring that cooperates with one end of the column 31 provided with a welding surface.

[0040] In some embodiments of the present invention, in order to further fix the rotation of the column 31 (i.e., to further prevent the rotation of the connecting portion 30), a rotation stopper 32 is provided on the side wall of the column 31;

[0041] The outer periphery of the insulating ring 20 is provided with a groove body that matches the anti-rotation body 32. During assembly, the anti-rotation body 32 is embedded in the groove body, further preventing the rotation of the column 31 during subsequent use;

[0042] The shape of one end of the insulating ring 20 away from the anti-rotation body 32 matches the shape of the fixing ring 10 , so that the end of the insulating ring 20 away from the anti-rotation body 32 can be embedded in the fixing ring 10 .

[0043] In some embodiments of the present invention, an extension portion is provided around one end of the sealing body 40 away from the column 31;

[0044] One end of the sealing body 40 away from the column 31 is connected to the base 50;

[0045] The base 50 is provided with a groove matching with the extension part;

[0046] like Figure 3As shown, during assembly, the end of the column 31 away from the welding surface is compressed on the ring-shaped sealing body 40, and the end of the sealing body 40 away from the column 31 is embedded in the groove on the base 50. On the one hand, it isolates the connecting part 30 and the base 50, and on the other hand, it realizes the sealing and insulation of the bottom of the sealing body 40. The anti-rotation body 32 on the column 31 is embedded in the groove body on the insulating ring 20 to prevent the rotation of the column 31 during subsequent use. At the same time, the end of the insulating ring 20 away from the anti-rotation body 32 is embedded in the fixing ring 10 to complete the fixed connection between the fixing ring 10 and the connecting part 30. The fixing of the fixing ring 10 ensures the compression amount of the sealing body 40 by the column 30, so that in the embodiment of the utility model, the compression amount of the sealing body 40 is at least 1%.

[0047] In the embodiment of the utility model, exemplarily, the sealing body 40 is ring-shaped, and the groove provided on the base body 50 and matched with the extension portion of the sealing body 40 is correspondingly provided in a ring shape.

[0048] In other embodiments of the present invention, the sealing body 40 is in the shape of an inner circle and an outer square, and the groove provided on the base 50 and matching with the extension portion of the sealing body 40 is correspondingly set to a square shape.

[0049] In certain embodiments of the present invention, the outer periphery of the fixing ring 10 is fixed to the base 50 by laser welding, so as to further improve the fixity and sealing of the entire battery cell pole.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A battery cell pole, characterized in that: The connecting part includes a column, one end of the column is provided with a welding surface, the welding surface is connected to the busbar, one end of the column away from the welding surface is compressed with a sealing body, and the inside of the column is connected with a pole ear or a transfer sheet; One end of the column provided with a welding surface is fixedly connected to a fixing ring, and the welding surface of the column is exposed in the hollow portion of the fixing ring.

2. A battery cell pole according to claim 1, characterized in that: The sealing body is ring-shaped.

3. A battery cell pole according to claim 1, characterized in that: The sealing body is in the shape of an inner circle and an outer square.

4. A battery cell pole according to claim 1, characterized in that: The length of the column is 1-5 mm.

5. The battery cell pole according to claim 1, characterized in that: The column is made of pure aluminum or a copper-aluminum composite material.

6. A battery cell pole according to claim 1, characterized in that: One end of the column provided with a welding surface is fixedly connected to the fixing ring via an insulating ring; One end of the insulating ring matches with one end of the column provided with a welding surface, and the other end is embedded in the fixing ring.

7. A battery cell pole according to claim 6, characterized in that: A rotation stopper is provided on the side wall of the column; The outer periphery of the insulating ring is provided with a groove body matched with the anti-rotation body.

8. A battery cell pole according to any one of claims 1 to 7, characterized in that: An extension portion is provided on the peripheral side of one end of the sealing body close to the column; One end of the sealing body away from the column is connected to the base body; The base is provided with a groove matched with the extension part.

9. A battery cell pole according to claim 8, characterized in that: The compression of the sealing body is at least 1%.

10. The battery cell pole according to claim 8, characterized in that: The outer periphery of the fixing ring is fixed to the base body by laser welding.

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