Power battery pack management system

Abstract

The invention discloses a power battery pack management system. A single cell is a single battery in a power battery pack; a plurality of single cells are first connected with each other in series toform a battery pack; the battery pack is connected with a main control module in parallel; each single cell part is connected to each single cell in parallel; a collection circuit and an equalizationcircuit are electrically connected with a carrier circuit; the collection circuit is electrically connected with the equalization circuit; a BMS main control part circuit is electrically connected with the carrier circuit; and a direct current carrier chip is electrically connected with a peripheral circuit. The power battery pack management system realizes one-cell one-cell part management; the communication mode is electric wire direct current carrier communication, problems of common-ground and power supply isolation caused by a one-to-more collection mode of the traditional BMS are avoidedand advantages that wiring harnesses are less, the structure is simple, the system is beneficial for design and quantity production are realized. And meanwhile, the one-cell one-cell part managementmode is convenient to monitor the state of the cell while being convenient to detach the battery pack and is also beneficial for cascade utilization and secondary development of the battery.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a power battery group management system. Background technique [0002] With the consumption of energy, the reduction of resources, and the demand for the environment, the automotive industry is no longer limited to old-fashioned fuel-efficient vehicles, but has begun to develop towards new energy vehicles. However, in the development of new energy, the development of electric energy is rapid, so power batteries development is very important. [0003] At present, the power batteries of the most commonly used electric vehicles in China mainly rely on the battery management system (BMS) for unified management, that is, all batteries are divided into several battery packs, and each pack is equipped with a terminal module, which is collected by the acquisition chip on the terminal module. The temperature and voltage data of a group of batteries are balanced, and finally each ...

AI Technical Summary

Problems solved by technology

[0003] At present, the power batteries of the most commonly used electric vehicles in China mainly rely on the battery management system (BMS) for unified management, that is, all batteries are divided into several battery packs, and each pack is equipped with a terminal module, which is collected by the acquisition chip on the terminal module. The temperature and voltage data of a group of batteries are balanced, and finally each terminal module is connected to a central control module through the internal CAN bus for later data processing. However, the structure of this BMS system has its inevitable disadvantages: a collection The module collects n battery voltages, the acquisition module and each battery need to share the same ground, and the acquisition module power supply needs to be isolated from each battery. The demand for isolated power supply increases the complexity of the design, and the price of the isolated power supply further increases the manufacturing of the battery management system. cost

At the same time, the one-to-n acquisition method requires n acquisition lines, n common ground lines for batteries and acquisition modules, plus CAN lines for data transmission and reception, resulting in many and complex wiring harnesses for the BMS, extremely complicated installation and disassembly, and high safety. also decreases with increasing complexity

At the same time, the wiring harness of each BMS product is very different, and the installation complexity is high, making it difficult to achieve mass production of BMS

[0004] When it comes to the reuse of power batteries, once the battery pack is disassembled and removed, each battery will be disconnected from the terminal module and the central control, and the battery status data will be lost immediately, making it impossible to realize battery evaluation and cascade utilization in a timely and effective manner.

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