A battery pack application node and matrix battery management system and implementation method

Abstract

The invention provides a battery pack application node, a matrix battery management system and an implementation method. The node is a circuit board composed of a first switch, a second switch and a third switch line connection, and five switches are arranged on the circuit board. four connection points, A, B, C, and D are single contacts, which are used to connect power lines; Z is a composite contact, which is used to connect communication buses and selectively connect sensors. Nodes in the matrix battery management system The two sides are respectively connected with battery cells, wherein the first connection point of the battery pack application node is connected to the positive pole of the left end battery cell, the second connection point is connected to the negative pole of the right end battery cell, and the fifth connection point of the battery pack application node The connection point is connected to the general controller line through the communication bus, and the operation of parallel connection or combined charging and combined discharging is realized by uniformly switching the three switches of the node. When the battery pack is composed of multiple groups in series, through flexible control The status of each node can realize the charging, discharging and disconnecting operations of any series group.

Description

technical field [0001] The invention relates to the application field of medium and large-scale battery pack management, in particular to a battery pack application node, a matrix battery management system and an implementation method. Background technique [0002] Battery packs are widely used in our daily life, ranging from small TV remote controls, electronic toys and flashlights to electric vehicles, bank backup power supplies, communication rooms, radar stations, and radio and television rooms. However, with the application of medium and large-scale battery packs, the disadvantages of the existing battery management system are revealed. [0003] In the battery pack, the difference between the monomers always exists. Taking the capacity as an example, the difference will never disappear, but will gradually deteriorate. The same current flows in the battery pack, and the capacity is relatively large. Those with relatively small currents tend to be shallowly charged and d...

AI Technical Summary

Problems solved by technology

However, with the application of medium and large-scale battery packs, the disadvantages of the existing battery management system are revealed

[0003] In the battery pack, the difference between the monomers always exists. Taking the capacity as an example, the difference will never disappear, but will gradually deteriorate. The same current flows in the battery pack, and the capacity is relatively large. Those with relatively small currents tend to be shallowly charged and discharged with a relatively small current, tending to slow capacity decay and prolong life, while those with small capacity are always in relatively high current overcharge and over discharge, tend to accelerate capacity decay, and shorten life. The parameter difference is getting bigger and bigger, forming a positive feedback characteristic, and the small capacity will fail early, resulting in shortened battery pack life

[0004] It can be seen that whether the battery pack is connected in parallel first and then in series or first in series and then in parallel, the following problems will be involved: for the series connection, it is currently impossible to control the current of each series unit, so when the charging is completed, there is no guarantee. Each series unit is fully charged, and the total capacity of the battery pack will be determined by the series unit with the smallest capacity, which directly affects the working efficiency and service life of the entire battery pack

As for the use problem after the life of the battery pack is shortened, it can only be solved by replacing the new battery pack at this stage, which inevitably increases the cost of use.

[0005] The matrix battery pack is to arrange the battery pack in a matrix shape. The performance of the battery pack has been optimized in the patent application documents of application numbers 200910096144.0, 201010161351.2, and 201210136094.6, but the above technical problems still cannot be well solved

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