Lithium battery connecting strip

Abstract

The invention discloses a lithium battery connecting strip which comprises a connecting part A and a connecting part B. The two ends of the connecting part B are connected with the connecting parts A respectively, and the connecting parts A at the two ends of the connecting part B are symmetrically arranged. Through the arrangement of the arch structure of the main body, the lithium battery can have certain movement allowance in the mechanical influence process, the welding spot position cannot be pulled, and the mechanical adaptability is improved; and through the arrangement of the rectangular opening, current can fully pass through the surface of the battery when the connecting strip and the cylindrical lithium battery are subjected to resistance welding, and reliable welding fusion is ensured. The structure is simple, the reliability of lithium battery connection can be improved, and the lithium battery connection can better adapt to complex environment requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium battery connecting strip. Background Art

[0002] Lithium batteries are widely used in various fields due to their high energy density, fast charging, long life, lightness, convenience, safety, and low cost. Based on standardized and modular design ideas, the commonly used structures of lithium batteries on the market are 18650 cylindrical lithium batteries and 26650 cylindrical lithium batteries. The voltage of a single cylindrical lithium battery is about 4V and the capacity is about 3Ah. When a higher voltage capacity is required for normal use, the cylindrical lithium batteries need to be connected in series or in parallel. Due to the excellent conductivity and weldability of nickel materials, nickel strips are commonly used. However, during the connection process of lithium batteries, nickel strips have problems such as poor welding reliability, poor mechanical adaptability, and poor insulation.

[0003] The patent document with announcement number CN208157560U discloses an intelligent open-type lead-acid battery, in which multiple cells are arranged in a box, a liquid filling plug is set on the top of the cell, a connecting strip is set between adjacent cells, both ends of the connecting strip are fixed to the cell, and then covered with a connecting strip cover, and all the cells are connected in series to form a battery pack.

[0004] The patent document with the announcement number CN105810867A discloses a solid polymer lithium battery pack and its preparation method. The lithium battery pack includes: single cells, connection kits, cables, battery boxes and potting glue, and has the functions of power supply, storage and multiple charge / discharge. The patent uses the connection strips, insulating blocks and fasteners of the welding installation wires to combine multiple single cells into a lithium battery pack according to a certain connection method.

[0005] The above patented connecting strip is long and does not allow for the movement of the lithium battery under mechanical influence, which can easily cause the solder joint to be pulled. At the same time, no special insulation layer is provided to avoid battery short circuit. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a lithium battery connecting strip.

[0007] The present invention is achieved through the following technical solutions.

[0008] The present invention provides a lithium battery connecting bar, comprising a connecting portion A and a connecting portion B, wherein both ends of the connecting portion B are respectively connected to the connecting portion A, and the connecting portions A at both ends of the connecting portion B are symmetrically arranged.

[0009] Preferably, the connecting part B includes a main body and a connecting part C, both ends of the main body are connected to the connecting part C respectively, and the connecting part C is connected to the connecting part A.

[0010] Preferably, the main body is V-shaped, the connecting portion B is prepared by stamping, and the connecting portion C and the connecting portion A are arranged in parallel.

[0011] Preferably, insulating plastic powder is sprayed on the connecting portion B, and the components of the insulating plastic powder include, in parts by mass: 15-30 parts of resin and 2-8 parts of pigment.

[0012] Preferably, the pigment components include, in parts by mass, 18-30 parts of mica and 0.3-9 parts of SiO2.

[0013] Preferably, the resin is EVA resin.

[0014] Preferably, an opening is provided on the connecting portion A, and the opening is rectangular.

[0015] Preferably, a chamfer is provided on a side of the connection portion A away from the connection portion B.

[0016] Preferably, the connecting portion A is made of nickel.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a certain amount of movement margin for the lithium battery during mechanical influence by means of the arched structure of the main body, which will not pull the welding point position and improve the mechanical adaptability; the rectangular opening can ensure that the current fully passes through the battery surface when the connecting strip is welded with the cylindrical lithium battery resistance, ensuring reliable welding and melting. The present invention has a simple structure, can improve the reliability of lithium battery connection, and allows the lithium battery connection to better adapt to complex environmental requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] In the figure: 1-connection part A, 2-opening, 3-connection part B, 31-main body, 32-connection part C, 4-chamfer. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0022] Example:

[0023] like Figure 1 As shown, a lithium battery connecting bar includes a connecting portion A1 and a connecting portion B3, wherein both ends of the connecting portion B3 are respectively connected to the connecting portion A1, and the connecting portions A1 at both ends of the connecting portion B3 are symmetrically arranged.

[0024] The connection portion B3 includes a main body 31 and a connection portion C32. Both ends of the main body 31 are respectively connected to the connection portion C32, and the connection portion C32 is connected to the connection portion A1.

[0025] The main body 31 is V-shaped, and the connecting portion B3 is prepared by stamping. The shape of the main body 31 allows the connecting strip to have a certain amount of mobility when the lithium battery is subjected to mechanical influences after being connected to the lithium battery, and will not pull the welding point position, thereby improving the mechanical adaptability. The connecting portion C32 is arranged in parallel with the connecting portion A1.

[0026] The insulating plastic powder is sprayed on the connecting portion B3 to provide insulation protection and prevent short circuit. The insulating plastic powder components are in parts by mass, including: 15-30 parts of resin, 2-8 parts of pigment and 2-3 parts of additives, preferably 22 parts of resin, 5 parts of pigment and 2 parts of additives. The additives are used in existing processes and can be added and selected as needed. The thickness of the sprayed insulating plastic powder layer is 0.1-0.2 mm, preferably 0.15 mm.

[0027] The pigment component includes, in parts by mass, 18-30 parts of mica and 0.3-9 parts of SiO2, preferably 26 parts of mica and 5 parts of SiO2.

[0028] The resin is EVA resin, which has good insulation performance.

[0029] The connecting portion A1 is provided with an opening 2 which is rectangular and can ensure that the current fully passes through the battery surface when the connecting strip is welded to the cylindrical lithium battery resistor, thereby ensuring reliable welding and melting.

[0030] A chamfer 4 is provided on the side of the connection portion A1 away from the connection portion B3 to ensure that the fingers of the operator will not be cut during the operation of the connection strip.

[0031] The connecting portion A1 is made of nickel.

Claims

1. A lithium battery connecting strip, characterized in that: The invention comprises a connecting portion A (1) and a connecting portion B (3), wherein two ends of the connecting portion B (3) are respectively connected to the connecting portion A (1), and the connecting portions A (1) at the two ends of the connecting portion B (3) are symmetrically arranged.

2. A lithium battery connecting strip as claimed in claim 1, characterized in that: The connecting part B (3) comprises a main body (31) and a connecting part C (32), two ends of the main body (31) are respectively connected to the connecting part C (32), and the connecting part C (32) is connected to the connecting part A (1).

3. A lithium battery connecting strip as claimed in claim 2, characterized in that: The main body (31) is V-shaped, the connecting portion B (3) is prepared by stamping, and the connecting portion C (32) is arranged parallel to the connecting portion A (1).

4. A lithium battery connecting strip as claimed in claim 1, characterized in that: Insulating plastic powder is sprayed on the connecting portion B (3), and the components of the insulating plastic powder include, in parts by mass, 15-30 parts of resin and 2-8 parts of pigment.

5. A lithium battery connecting strip as claimed in claim 4, characterized in that: The pigment components include, in parts by mass, 18-30 parts of mica and 0.3-9 parts of SiO2.

6. A lithium battery connecting strip as claimed in claim 4, characterized in that: The resin is EVA resin.

7. A lithium battery connecting strip as claimed in claim 1, characterized in that: The connecting portion A (1) is provided with an opening (2), and the opening (2) is rectangular.

8. A lithium battery connecting strip as claimed in claim 1, characterized in that: A chamfer (4) is provided on the side of the connection portion A (1) away from the connection portion B (3).

9. A lithium battery connecting strip as claimed in claim 1, characterized in that: The connecting portion A (1) is made of nickel.

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