Connecting piece structure and battery assembly

Abstract

The utility model relates to the technical field of battery production processes, in particular to a connecting piece structure and a battery assembly. The utility model provides a connecting piece structure. The connecting piece structure comprises a connecting part; the sheet pressing part and the sheet supporting part are used for clamping a battery; wherein an extension sheet is arranged on one side of the sheet pressing part, and a welding position is arranged on the upper surface of the extension sheet; according to the utility model, the sheet pressing part and the sheet supporting part are connected through the connecting part, the extension sheet is arranged on one side of the sheet pressing part, and the connecting sheet is fixedly connected with the battery cover plate and the battery core pack through the welding position on the extension sheet, so that the connecting sheet can be compatible with a pole piece structure of a double-side lead-out tab under the condition that a shell structure of a traditional single-side pole column is kept; the development process of the novel battery cell structure is simplified, the development cost of the novel battery cell structure is reduced, and meanwhile, the compatibility of the battery cell at the module end is improved by reserving a traditional shell structure.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production technology, in particular to a connecting piece structure and a battery assembly. Background Art

[0002] With the continuous development of green and clean energy technology, lithium-ion battery technology has also developed rapidly. In order to meet various market demands, the battery structure of lithium-ion batteries is also being continuously optimized. Among them, the connecting plate is a connecting device arranged between the battery cover and the battery core pack. In actual production, the two are welded together through laser welding technology.

[0003] The battery cell structure usually adopts a single-sided tab structure, that is, a single battery cell only includes a shell and a cover structure. Therefore, each battery cell only needs to be provided with a connecting piece on one side of the shell. However, with the continuous changes in the battery cell structure, the traditional single-sided connecting piece can no longer meet the demand. With the demand for the development of large-capacity battery cells, the size of the battery cell pole pieces is getting larger and larger, resulting in uneven current density distribution in the traditional single-sided tab structure, which in turn leads to uneven temperature distribution, and finally affects the battery life.

[0004] In order to better match the large-capacity battery cell design, a double-sided output ear structure is proposed in the relevant technology, so that the current during the charging and discharging process can flow from both ends of the battery cell at the same time, which can effectively improve the consistency of the current density distribution on the electrode and increase the battery life. However, this kind of battery cell design requires a battery cover structure at both ends of the battery, that is, a bipolar column structure, which complicates the production process and also requires double connecting pieces to complete the welding of the cover and the battery ear, resulting in increased production costs.

[0005] Therefore, how to solve the welding problem of the bipolar column structure is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0006] The utility model provides a connecting piece structure and a battery assembly to solve the above technical problems.

[0007] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a connecting plate structure, including: a connecting part; and a pressing plate part and a supporting plate part for clamping the battery; wherein an extension plate is arranged on one side of the pressing plate part, and a welding position is arranged on the upper surface of the extension plate.

[0008] Furthermore, the pressing sheet portion and the supporting sheet portion are rectangular sheets of the same size; wherein the width of the rectangular sheet is greater than the width of the extending sheet.

[0009] Furthermore, the outer contour of the welding position is circular.

[0010] Furthermore, an embossed structure is provided on the welding position.

[0011] Furthermore, the embossed structure includes pits arranged at equal intervals.

[0012] Furthermore, a hole for reducing weight is provided at the center of the connecting portion.

[0013] Furthermore, the connection position between the pressing portion and the connecting portion and the connection position between the supporting portion and the connecting portion are both bending portions.

[0014] Furthermore, an insulating protective layer is provided on the bending portion.

[0015] Furthermore, the connecting plate structure also includes a positive connecting plate and a negative connecting plate; wherein the positive connecting plate is made of aluminum, and the negative connecting plate is made of copper.

[0016] The utility model also provides a battery assembly: adopting the connecting piece structure as described above; wherein the connected battery is a lithium battery.

[0017] Compared with the prior art, the embodiments of the utility model have the following beneficial effects: the pressing part and the supporting part are connected by the connecting part, and an extension piece is arranged on one side of the pressing part, and the connecting piece is fixedly connected with the battery cover plate and the battery core pack through the welding position on the extension piece, so that the connecting piece can be compatible with the pole piece structure with double-sided pole ears while retaining the shell structure of the traditional single-sided pole, which simplifies the development process of the new battery cell structure and reduces the development cost of the new battery cell structure. At the same time, the retention of the traditional shell structure is also conducive to improving the compatibility of the battery cell at the module end. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 A three-dimensional diagram of the optimal embodiment of the connecting piece structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the connecting piece of the utility model;

[0021] Figure 3 It is a stereoscopic diagram of the optimal embodiment of the battery assembly of the utility model.

[0022] Among them, 1. pressing part; 11. extension piece; 12. welding position; 2. supporting part; 3. connecting part; 31. missing hole; 4. bending part; 5. battery. DETAILED DESCRIPTION

[0023] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0024] See also Figure 1 , Figure 1 This is a stereogram of the optimal embodiment of the connecting piece structure of the utility model. Figure 1 As shown, at least one embodiment provides a connecting plate structure, including: a connecting part 3; and a pressing plate part 1 and a supporting plate part 2 for clamping a battery 5; the pressing plate part 1 and the supporting plate part 2 are respectively fixed at both ends of the connecting part 3, and the connecting plate structure also includes a positive connecting plate and a negative connecting plate; a battery 5 has a positive connecting plate and a negative connecting plate, wherein the material of the positive connecting plate is aluminum, and the material of the negative connecting plate is copper.

[0025] Please continue reading Figure 1 Combined with Figure 2 , Figure 2 Schematic diagram of the structure of the connecting piece of the utility model. Figure 1 to Figure 2 As shown, an extension sheet 11 is provided on one side of the pressing sheet 1. The extension sheet 11 protrudes from one side of a rectangular sheet. This position is used to connect the battery and the cover plate by welding. A welding position 12 is provided on the upper surface of the extension sheet 11. The outer contour of the welding position 12 is circular. In order to make the welding position more firm after welding, an embossing structure is provided on the welding position 12. The embossing structure includes pits arranged at equal intervals. The pits and protrusions are formed at intervals to reduce the reflection phenomenon during laser welding and improve the welding yield.

[0026] Please continue reading Figure 1 Combined with Figure 2 .like Figure 1 to Figure 2 As shown, the pressing sheet portion 1 and the supporting sheet portion 2 are rectangular sheets of the same size; the two rectangular sheets are used to be attached to the two side surfaces of the battery 5 , wherein the width of the rectangular sheets is greater than the width of the extending sheet 11 .

[0027] Please continue reading Figure 1 .like Figure 1 As shown, a weight-reducing hole 31 is provided at the center of the connecting portion 3. The weight-reducing hole 31 is beneficial to reducing the overall mass of the connecting piece, thereby improving the overall energy density of the battery cell.

[0028] Please continue reading Figure 1 .like Figure 1 As shown, the connection position between the pressing part 1 and the connecting part 3 and the connection position between the supporting part 2 and the connecting part 3 are both the bending part 4. In order to avoid short circuit problems when the pole piece contacts them, an insulating protective layer is provided on the bending part 4.

[0029] See also Figure 3 , Figure 3 1 is a stereogram of the optimal embodiment of the battery assembly of the utility model. Figure 3 As shown, some embodiments further provide a battery assembly: using the connecting sheet structure as described above; wherein the connected battery 5 is a lithium battery.

[0030] In summary, the connecting piece can be compatible with the pole piece structure with double-sided output ears while retaining the shell structure of the traditional single-sided pole, which simplifies the development process of the new battery cell structure and reduces the development cost of the new battery cell structure. At the same time, the retention of the traditional shell structure is also conducive to improving the compatibility of the battery cell at the module end.

[0031] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A connecting sheet structure, characterized in that: include: A connecting portion (3); and A pressing sheet portion (1) and a supporting sheet portion (2) for clamping a battery (5); wherein An extension sheet (11) is provided on one side of the pressing sheet portion (1), and a welding position (12) is provided on the upper surface of the extension sheet (11).

2. The connecting sheet structure according to claim 1, characterized in that: The pressing sheet portion (1) and the supporting sheet portion (2) are rectangular sheets of the same size; wherein The width of the rectangular piece is greater than the width of the extension piece (11).

3. The connecting piece structure according to claim 2, characterized in that: The outer contour of the welding position (12) is circular.

4. The connecting sheet structure according to claim 3, characterized in that: An embossing structure is provided on the welding position (12).

5. The connecting sheet structure according to claim 4, characterized in that: The embossed structure includes equally spaced pits.

6. The connecting sheet structure according to claim 5, characterized in that: A weight-reducing hole (31) is provided at the center of the connecting portion (3).

7. The connecting sheet structure according to claim 6, characterized in that: The connection position between the pressing portion (1) and the connecting portion (3) and the connection position between the supporting portion (2) and the connecting portion (3) are both bending portions (4).

8. The connecting sheet structure according to claim 7, characterized in that: An insulating protective layer is provided on the bent portion (4).

9. The connecting sheet structure according to claim 8, characterized in that: The connecting piece structure also includes a positive connecting piece and a negative connecting piece; wherein The positive electrode connecting piece is made of aluminum. The negative electrode connecting piece is made of copper.

10. A battery assembly: characterized in that, A connecting piece structure as described in any one of claims 1 to 9 is adopted; wherein The connected battery (5) is a lithium battery.

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