A current sharing structure of a large-capacity lithium-ion battery system

Abstract

The current sharing structure of a large-capacity lithium-ion battery system of the present invention is a network matrix in which the battery cells are connected in series and parallel, so that the current flows on average through a plurality of parallel branches divided into several columns, and each parallel branch The multiple battery cells in the parallel branch are connected in parallel; the multiple battery cells in each parallel branch are connected to the multiple battery cells in the adjacent parallel branch in the same column through stacked series conductors to achieve series connection; Multiple battery cells in parallel branches at the head end of the first row and the end of the last row are connected to multiple connection contacts of the total negative or total positive conductor bus bar of the power supply bus through equal-length bus wires; The multiple battery cells in the parallel branch at the head end or end of the row are connected to the multiple battery cells in the parallel connection branch at the end or head end of an adjacent row through a plurality of busbars of equal length to achieve series connection. In the present invention, the stacked series conductors do not need to use thick conductors, which can reduce the weight of the battery pack and heat generation of the conductors, and improve reliability.

Description

technical field [0001] The invention relates to a large-capacity lithium-ion battery pack, in particular to a current-sharing structure of a special engineering vehicle battery system suitable for high-current charging and discharging. Background technique [0002] At present, the power drive of special vehicles for engineering applications mainly adopts two modes of diesel power and pure electric power. With the continuous improvement of environmental protection requirements and the continuous introduction of new policies for energy conservation and emission reduction in the country, pure electric special engineering vehicles are more and more favored by users. . Its power supply device is generally composed of multiple large-capacity batteries connected in series, which often experience a charge and discharge current of several hundred amperes. In order to ensure that the battery pack has excellent cycle performance, the series-parallel combination method and connection ma...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of inhomogeneous thermoelectricity in multi-stage series-parallel combinations of large-capacity batteries in special engineering vehicles, the present invention proposes a battery pack current sharing structure, which is connected through the parallel branch connection and confluence connection of the power supply bus, based on the safety design of the system The series-parallel connection bar design makes the battery pack have higher power, reliability and safety in practical application

Images