Interlaced power cell groups

Abstract

The invention discloses interlaced power cell groups. The interlaced power cell groups comprise unit cells and parallel elements, wherein the unit cells are divided into N groups; each unit cell group has M unit cells; unit cells of the two adjacent unit cell groups have a one-to-one correspondence relationship; M unit cells are connected in series successively; both N and M are integers greater than or equal to 2; both N and M are not equal to 2 at a same time; the parallel elements are divided into e groups; a first end of any parallel element of an eth parallel element group is connected between two adjacent unit cells of the eth unit cell group of an Nth group; a second end of the any parallel element of the eth parallel element group is connected between two adjacent unit cells of an (e plus one)th unit cell group; and the N unit cell groups are made to be connected in parallel through the multiple parallel elements. The interlaced power cell groups have great security and high reliability, can assist in managing precisely every unit cell and have a self-balancing function.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to an interleaved group power battery pack. Background technique [0002] With the continuous development of science and technology, cars have gradually entered ordinary family life. In recent years, global car production and sales have been steadily increasing. At the same time, the global oil resources are depleted and the greenhouse effect is becoming more and more serious. The two major issues of energy and environment have become major challenges for various countries and major automobile manufacturers in the world. Therefore, the development of new energy vehicles that are energy-saving and environmentally friendly It must be done. Among many types of new energy vehicles, electric vehicles (including pure electric vehicles and hybrid vehicles) gradually stand out, and power batteries are one of the most critical components of electric vehicles, but the voltage and cap...

AI Technical Summary

Problems solved by technology

When the scheme of paralleling first and then series is adopted, if a single cell has a short-circuit fault, all the battery cells connected in parallel will be short-circuited by it, and the short-circuit current is very large, which will cause very serious safety problems. The terminal voltage of each battery cell is exactly the same under any circumstances. The battery management system cannot obtain the terminal voltage of each battery cell separately, let alone perform accurate state estimation and fault diagnosis for each battery cell. resulting in a safety hazard

Using the scheme of series first and then parallel, if a single battery has an open circuit fault, all the single batteries connected in series cannot continue to work, the reliability of the battery pack is low, and the battery pack lacks self-balancing function

[0004] It can be seen from the above that the traditional power battery group technology has disadvantages such as low reliability, poor safety and lack of self-balancing function.

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