Battery charging and discharging test method and system based on energy storage PCS (Power Conversion System) + BMS (Battery Management System)

Abstract

The invention discloses a battery charging and discharging test method and a system based on energy storage PCS (Power Conversion System) + BMS (Battery Management System). The method comprises the following steps: constructing a common DC bus required for charging and discharging a battery through an energy storage PCS; when the battery is being charged, extracting energy from the network side bythe energy storage PCS, and when the battery is discharged, feeding the power quantity on the DC bus back to a power grid by the energy storage PCS; hooking the battery to be tested to the DC bus, wherein each group of batteries to be tested is equipped with a set of BCMU (Battery Control Management Unit) for monitoring the state of the battery to be tested and controlling inputting in and removal from the charge and discharge circuit of the battery to be tested; and summarizing the battery charge and discharge information, completing a protection and control strategy for the battery chargingand discharging, and uploading relevant information to a host computer by all battery branches to be tested through the BSMU. The investment of the battery charging and discharging test method and the system based on the energy storage PCS + BMS is low and the expandability thereof is strong, and the invention can be used for battery testing by using PCS and BMS of an engineering project. After the battery testing is completed, the PCS and the BMS can enter the warehouse together with the battery, thereby reducing the investment of fixed assets.

Description

technical field [0001] The invention relates to the technical field of battery charging and discharging testing. Background technique [0002] Energy storage technology, especially electrochemical energy storage technology, has developed rapidly in recent years due to its characteristics of reactive power compensation and improving the stability of power systems. Energy storage batteries are the core and foundation of electrochemical energy storage systems, and the quality and stability of energy storage batteries are the basis for the stability of electrochemical energy storage systems. [0003] Before the energy storage battery enters the warehouse, the energy storage battery needs to be carefully tested, including the detection of internal resistance, the detection of sampling accuracy, and the charge and discharge test of the battery (capacity calibration), etc. For the charge and discharge test of the energy storage battery, it is necessary to use the battery charge an...

AI Technical Summary

Problems solved by technology

This battery detection solution requires the outsourcing of a complete set of equipment or the targeted development of related battery charging and discharging equipment. The investment is large and the scalability is poor. A bidirectional DCDC branch can only complete the charging and discharging detection and capacity calibration of one battery pack at the same time.

[0004] The disadvantages of battery charging and discharging solutions currently on the market mainly include: 1. High cost. Energy storage manufacturers need to purchase a complete set of battery charging and discharging testing equipment, or develop bidirectional power supplies, bidirectional DCDC converters and supporting PC software. Two ways to invest are larger

2. Poor scalability. The current battery charge and discharge detection equipment on the market is generally single-channel or dual-channel. One channel can detect the charge and discharge of one battery, and the number of channels cannot be expanded.

When the number of test channels cannot meet the needs of battery testing, it can only be solved by increasing the number of testing devices

3. The voltage range is limited. The output voltage range of some battery charge and discharge detection equipment on the market is limited. When the battery voltage specification exceeds the rated output voltage range of the equipment, the battery charge and discharge and capacity calibration tests cannot be performed.

4. Testing equipment is a fixed investment, and its cost can only be recovered gradually through project products

There are less testing equipment, which will lead to delivery risks when there is a peak production capacity

When there are many testing equipment and low production capacity, resources are wasted

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