Data collecting system of battery pack

Abstract

The invention discloses a data collecting system of a battery pack, which comprises a plurality of data collecting devices and at least one power collecting unit. Each data collecting device is connected with a plurality of batteries, and at least one power collecting unit is connected with all the batteries in the battery pack. All the data collecting devices are connected with a communication network bus, and all the power collecting units are connected with the communication network bus. The communication network bus performs data interaction with each data collecting device according to the addresses of accessed data collecting devices. By means of the data collecting system, collection of charging and discharging current, total voltage and monomer voltage of the battery pack can be synchronously performed, and uniformity of data can be ensured.

Description

technical field [0001] The invention relates to a data acquisition system for a battery pack, in particular to a data acquisition system for a power battery pack. Background technique [0002] Since electric vehicle battery packs (usually referred to as power battery packs) are usually composed of dozens or even hundreds of single cells, the working status of each single cell has a great impact on the entire battery pack. Whether the working state is normal or not not only reflects the quality of the battery pack, but also affects the battery pack. Practice has shown that during the operation of electric vehicles, if the inconsistent batteries are not detected in time and replaced or adjusted, the capacity of the battery pack will be reduced and the battery life will be shortened, which will affect the efficient and safe operation of the entire battery pack. Therefore, the consistency of the battery pack is of great significance for the application of the power battery pack...

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art, when testing a group of batteries, there will be a problem of how many batteries are connected in series. Therefore, for high-power batteries, the total voltage acquisition range is very wide, ranging from a few volts to hundreds of volts. volts, the existing acquisition system cannot meet the higher accuracy requirements under lower or higher total voltage conditions

[0006] In the collection of single cell voltage, while ensuring high precision, the existing method of itinerantly collecting the voltage value of each battery makes the data of each battery not collected at the same time, and there is a certain time delay. Checking the consistency of the battery has a certain impact, and also affects the speed of collection

[0007] Similarly, since the current acquisition is independent of the total voltage and single cell voltage acquisition, the acquisition of current and voltage is not performed synchronously, and the power and watt-hour data calculated according to the current and voltage values ​​cannot represent the real state of the battery pack or single battery. Checking the consistency of the battery has a certain impact

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