Recoverable lithium ion battery with high expansion rate

Abstract

The embodiment of the invention provides a recoverable lithium ion battery with a high expansion rate; the battery is characterized by comprising at least two lithium ion battery monomers (1) and conductive wires (2); conductive tabs (101) on the lithium ion battery monomers are bent to be 7-shaped (102), and the at least two lithium ion battery monomers are stacked and combined to form a lithium ion battery pack; and the conductive wires (2) are bent into S shapes and are connected to the planes of the tops of the corresponding 7-shaped tabs of the lithium ion battery monomers. According to the invention, the S-shaped flexible multi-strand wire technology is combined with the 7-shaped plane tab bending technology and a multi-strand wire welding resistance welding and flexibility enhancing technology, so that the problem that the charge-discharge cycle volume change of the recoverable high-expansion-rate lithium ion battery cannot be met by the conductive bridging of the existing common bridging sheet, especially the problem of conductive bridging of a metal lithium ion battery pack, is solved.

Description

technical field [0001] The invention belongs to the technical field of batteries and relates to a lithium-ion battery with a recoverable high expansion rate. Background technique [0002] With the gradual maturity of metal lithium secondary battery technology, metal lithium secondary battery can also realize charge and discharge within a certain period, and the specific energy is as high as 430Wh / kg or more, especially the soft-packed metal lithium ion battery, its specific energy is even As high as 530Wh / kg, it has great application value in the field of high specific energy. However, the thickness of the soft-pack type lithium metal secondary battery will change during the charging and discharging process every week. The thickness change rate is as high as 8%, and the thickness change is quite obvious. When the number of single batteries connected in parallel is large enough, there is no deformable It is difficult for the jumper to adapt to the volume expansion, which wil...

AI Technical Summary

Problems solved by technology

However, the thickness of the soft-pack type lithium metal secondary battery will change during the charging and discharging process every week. The thickness change rate is as high as 8%, and the thickness change is quite obvious. When the number of single batteries connected in parallel is large enough, there is no deformable It is difficult for the jumper to adapt to the volume expansion, which will either lead to the breakage of the tab or the jumper, or the excessive strength of the jumper will cause fan-shaped deformation, and even further lead to a shortened charge-discharge cycle life and a significant drop in power supply capacity.

[0003] CN109065777A "A Lightweight Design Lithium-ion Battery Pack for Launch Vehicles", the bridge between monomers is tiled, which cannot adapt to the volume expansion of soft-packed batteries; CN201021513Y "A The bridge structure between the battery packs adopts a direct connection mode without buffering, which cannot solve the problem of volume expansion during the expansion process of the bridge plates; image 3 It can be seen that the bridging mode between the single cell and the single cell is an "Ω" type bridging mode, which can adapt to the volume expansion, but cannot adapt to the high volume expansion of the pouch battery

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