Battery current collecting element and battery

Abstract

The utility model belongs to the field of batteries, and particularly relates to a battery current collecting element and a battery. The current collecting element of the battery comprises a pole group welding piece and a current collecting unit which is connected with the pole group welding piece and is integrally formed, each current collecting unit comprises a current collecting piece, a current collecting sub-piece and a current collecting tail which are connected in sequence; a pole piece is arranged on the current collecting tail; each current collection fragment comprises a current collection end and a fragment end; a first bent opening is formed in the joint of the current collecting end of the current collecting sub-sheet and the current collecting sheet; a second bent opening is formed in the connecting position of the piece separating end of the flow collecting piece and the flow collecting tail. According to the technical scheme, the double-layer structure is formed after bending, the utilization rate of the internal space of the battery can be improved on the premise of ensuring the current intensity, the energy density of the battery is effectively improved, the machinability in the cylindrical battery assembly process is not affected, the current collecting element structure of the new structure meets different equipment use requirements, and the structure is reasonable.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and in particular relates to a battery current collecting element and a battery. Background Art

[0002] Lithium-ion batteries are a type of secondary battery. Due to their outstanding advantages such as high energy density, high power factor, low self-discharge rate, good stability and long life cycle, lithium-ion batteries are widely used in electric vehicles and have become a power source with excellent performance.

[0003] The main structure of lithium-ion batteries includes outer packaging, battery cells, electrolytes that can conduct lithium ions, and other necessary internal components. The performance of lithium-ion batteries depends largely on the rationality of the battery structure design and the electrochemical properties determined by the electrode materials.

[0004] The current collecting element inside the battery is an important component that is directly connected to the electrode group to conduct current. The rationality of the current collecting element structural design will directly affect many aspects of the battery performance, especially the safety of the battery during use. Reasonable component structural design and connection method can effectively ensure the strength of safe charging and discharging of the battery and improve the reliability of the battery cell.

[0005] During the assembly process of a single cylindrical battery, multiple different parts need to be combined together. During the assembly process, due to various factors, the internal current collecting components occupy a large space inside the battery, which greatly limits the expansion of battery capacity and the improvement of battery energy density. If the internal current collecting component structure of the battery can be reasonably designed, it can not only improve the battery energy density and the utilization rate of the internal space of the battery while ensuring the same performance, but also reduce the resistance of the internal structural parts of the battery to a certain extent, and improve the battery performance. Utility Model Content

[0006] The purpose of the utility model is to overcome the defects in the prior art and provide a battery current collecting element and a battery.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0008] A battery current collecting element comprises a pole group welding sheet and an integrally formed current collecting unit connected to the pole group welding sheet; the current collecting unit comprises a current collecting sheet, a current collecting segment and a current collecting tail connected in sequence; the current collecting tail is provided with a pole sheet; the current collecting segment comprises a current collecting end and a segment end; a first bending opening is provided at the connection between the current collecting end of the current collecting segment and the current collecting sheet; a second bending opening is provided at the connection between the segment end of the current collecting segment and the current collecting tail.

[0009] After folding along the first bending opening and the second bending opening, the electrode group welding piece and the current collecting tail are in the same plane, which is the first plane, and a certain gap is maintained between the electrode group welding piece and the current collecting tail.

[0010] A third bending opening is provided at the connection between the current collecting tail and the pole piece.

[0011] The current collecting segment is provided with a slot matched with the pole piece; after being folded along the first bending opening and the third bending opening, the pole piece is arranged in the slot of the current collecting segment to form a second plane;

[0012] The first plane is arranged in parallel with the second plane.

[0013] A positioning hole is arranged at the center of the electrode group welding piece.

[0014] The utility model also includes a battery, comprising the battery current collecting element, an electrode group, a battery cover and an electrode arranged on the battery cover; the electrode group welding part of the battery current collecting element is connected to the electrode group; and the electrode sheet is connected to the electrode.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The technical solution of the utility model utilizes the setting of different bending openings, so that the pole piece and the current collecting piece are in the same plane, the pole group welding piece and the current collecting tail are in the same plane, and a double-layer structure is formed after bending, which can improve the internal space utilization of the battery while ensuring the current intensity, effectively improve the battery energy density, and do not affect the machinability during the assembly process of the cylindrical battery. The new structure of the current collecting element structure meets the use requirements of different equipment and has a reasonable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the battery current collecting element of the utility model in an unfolded state;

[0018] Figure 2 It is a schematic diagram of the overall structure of the battery current collecting element of the utility model in a folded state;

[0019] Figure 3 It is a structural schematic diagram of the battery of the utility model. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiment.

[0021] Figure 1-2A battery current collecting element is shown, including a pole group welding sheet 10, and an integrally formed current collecting unit connected to the pole group welding sheet 11; the current collecting unit includes a current collecting sheet 12, a current collecting segment 20, and a current collecting tail 22 connected in sequence; the current collecting segment 20 includes a current collecting end 21 and a segment end 22; a pole sheet 31 is arranged on the current collecting tail 22; a first bending opening 13 is arranged at the connection between the current collecting end 21 of the current collecting segment 22 and the current collecting sheet 12; a second bending opening 32 is arranged at the connection between the segment end 22 of the current collecting segment 22 and the current collecting tail 30.

[0022] The bending position is determined by the second bending openings 13 and 32, and the bending angle is determined according to actual needs.

[0023] The pole piece 31 is arranged at the middle position of the side of the current collecting tail 30 and is equidistant from the segment ends 22 on both sides.

[0024] After folding along the first bending opening 13 and the second bending opening 32 ( Figure 2 As shown, the electrode group welding sheet 11 and the current collecting tail 30 are in the same plane, which is the first plane, and there is a certain gap between the electrode group welding sheet 11 and the current collecting tail 30. The current collecting tail 30 is in a parallel overlapping relationship with the segment end 22 through bending;

[0025] A third bending opening 32 is provided at the connection between the current collecting tail 20 and the pole piece 31 .

[0026] The current collecting segment 22 is provided with a slot matched with the pole piece 31; after being folded along the first bending opening 13 and the third bending opening 32; the pole piece is arranged in the slot of the current collecting segment 22 to form a second plane;

[0027] The first plane is arranged in parallel with the second plane.

[0028] A positioning hole 11 is provided at the center of the electrode group welding piece 10 .

[0029] Figure 3 A battery is shown, including the battery current collector, the pole group 40, the battery cover 50 and the pole 51 arranged on the battery cover 50; the pole group welding part 10 of the battery current collector is connected to the pole group connection 10; the pole sheet 31 is connected to the pole 51. The battery current collector structure is a piece of stamped and bent metal material, and the battery current collector is connected and fixed to the pole group 40, the battery cover 50 and other components by laser welding. The pole group welding part 10, the current collecting sheet 12, the current collecting sheet 20, and the current collecting tail 30 are made of aluminum or copper-plated nickel material. .

[0030] From the above, it can be seen that the technical solution of the utility model utilizes the setting of different bending openings to make the pole piece and the current collecting piece in the same plane, the pole group welding piece and the current collecting tail in the same plane, and form a double-layer structure after bending, which can improve the internal space utilization of the battery while ensuring the current intensity, effectively improve the battery energy density, and do not affect the machinability during the assembly process of the cylindrical battery. The new structure of the current collecting element structure meets the use requirements of different equipment and has a reasonable structure.

[0031] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery current collecting element, characterized in that: It comprises a pole group welding sheet and an integrally formed current collecting unit connected to the pole group welding sheet; the current collecting unit comprises a current collecting sheet, a current collecting segment and a current collecting tail connected in sequence; the current collecting tail is provided with a pole sheet; the current collecting segment comprises a current collecting end and a segment end; a first bending opening is provided at the connection between the current collecting end of the current collecting segment and the current collecting sheet; a second bending opening is provided at the connection between the segment end of the current collecting segment and the current collecting tail.

2. The battery current collecting element according to claim 1, characterized in that: After folding along the first bending opening and the second bending opening, the electrode group welding piece and the current collecting tail are in the same plane, which is the first plane, and a certain gap is maintained between the electrode group welding piece and the current collecting tail.

3. The battery current collecting element according to claim 2, characterized in that: A third bending opening is provided at the connection between the current collecting tail and the pole piece.

4. The battery current collecting element according to claim 3, characterized in that: The current collecting segment is provided with a slot matched with the pole segment; after being folded along the first bending opening and the third bending opening, the pole segment is arranged in the slot of the current collecting segment to form a second plane.

5. The battery current collecting element according to claim 4, characterized in that: The first plane is arranged in parallel with the second plane.

6. The battery current collecting element according to claim 1, characterized in that: A positioning hole is arranged at the center of the electrode group welding piece.

7. A battery, characterized in that: It comprises the battery current collecting element, pole group, battery cover and pole arranged on the battery cover as claimed in any one of claims 1 to 6; the pole group welding part of the battery current collecting element is connected to the pole group; and the pole sheet is connected to the pole.

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