10results about How to "Shorten equalization time" patented technology

The invention provides a series-parallel reconfigurable topology-based battery equalization system and a control method, the system comprises a flyback conversion unit and a working mode control unit, and the flyback conversion unit transmits energy from one side of a primary winding to one side of a secondary winding to complete battery equalization; the working mode control unit is used for controlling the working mode of the flyback conversion unit and comprises a charging control unit, a discharging control unit and a series-parallel connection switching unit, the charging control unit controls the single battery to be connected to one side of a secondary winding of the flyback conversion unit, and at the moment, the battery is in a charging state; the discharge control unit controls the single battery to be connected to one side of the primary winding of the flyback conversion unit, and the battery is in a discharge state at the moment; the switch of the series-parallel switching unit is switched off, the single batteries are respectively connected in parallel to two sides of the flyback conversion unit for battery equalization, after equalization is finished, the switch of the series-parallel switching unit is switched on, and the single batteries are sequentially connected in series to the battery pack to participate in discharging.

The invention discloses a charging and discharging power distribution method and system for fast equalization of SOC of multiple energy storage modules, and the method comprises the steps: calculating the sum Esumt of the total target electric quantity of a system according to the load power PLoad, the remaining electric quantity Eir of each battery pack and the equalization time T, then distributing Esumt according to the proportion of the maximum available capacity Eimax of each battery pack, obtaining the target electric quantity Eit of each battery pack, and obtaining the maximum available capacity Eimax of each battery pack; finally determining the reference power of each battery pack; carrying out capacity over-limit judgment on the Esumt, determining whether an over-discharge problem occurs to a single energy storage module of the energy storage system or not, and if the corresponding problem exists, reducing the reference power of the energy storage module with the over-discharge problem by adopting a power distribution method under capacity over-limit; according to the invention, the SOC balance of the multi-energy storage module system can be realized under the condition of balancing the load power, and a good balance effect is achieved when the SOC difference value is small; when it is judged that the over-discharge problem exists, the normal operation time of the system can be prolonged, and the SOC balance degree of the system can be improved.

The invention discloses a battery energy storage system equalization device and equalization method based on a reconfigurable converter, and belongs to the technical field of battery management. The device comprises a battery pack formed by connecting N single batteries in series, a switch array, a reconfigurable converter, a current monitoring circuit, an SOC monitoring circuit and a control circuit, N is larger than or equal to 1, each single battery is connected with the input end of the SOC monitoring circuit, the switch array comprises 2N gating switches, and the control circuit is connected with the input end of the SOC monitoring circuit. The two ends of each single battery are respectively provided with a gating switch and are connected with the primary side of the reconfigurable converter and the input end of the current monitoring circuit through the gating switches arranged at the two ends, and the secondary side of the reconfigurable converter is connected with the two ends of the battery pack; the control circuit is connected with the reconfigurable converter, the reconfigurable converter is provided with at least two circuit structures, and the two circuit structures correspond to different gains respectively; the control circuit is further connected with the output end of the SOC monitoring circuit, the output end of the current monitoring circuit and the switch array.

The invention discloses a multi-module parallel DC micro-grid system and a droop control method thereof, and relates to the field of DC micro-grid systems. According to the method, the parameter k and the quality factor Q are optimized and selected under the condition that the voltage gain is met, the optimized droop coefficient is obtained in combination with the balance coefficient and the speed regulation factor, and droop control is performed through the optimized droop coefficient. According to the invention, the bus voltage offset can be compensated, and the power balance is realized on the premise of not sacrificing the response speed.

The invention discloses a liquid metal battery module active equalization device and a control method, and the device comprises an equalization controller which is used for controlling the selection of equalization channels, combining a plurality of adjacent batteries with the same SOC into a battery segment, and taking the battery segment as a basic unit for active equalization control; performing charging equalization on each battery section, selecting a group of non-adjacent battery sections as active equalization of the current round, and ending active equalization of the current round when the battery section with the maximum SOC in the selected basic unit for equalization is charged to the maximum SOC value of the single battery in the series battery module; updating the SOC of each single battery in the current series module, and repeating the battery segment merging and battery equalization operations until the SOC of each single battery in the battery module is equal; the charger is used for charging the battery segments. The equalization device disclosed by the invention can solve the problems of difficulty in series module equalization and low efficiency caused by inconsistency of high-capacity liquid metal batteries.

The utility model relates to supercapacitor active equalization field discloses a kind of supercapacitor active equalization circuit, including MCU, AFE (analog front end), light MOS tube drive circuit, H bridge circuit, DC / DC isolated bidirectional power supply and rechargeable battery, the light MOS tube drive circuit includes Q1 pipe, Q2 pipe, Q3 pipe and Q4 pipe, the Q1 pipe, Q2 pipe, Q3 pipe and Q4 pipe are connected with the both ends of single supercapacitor monomer respectively, the input end of AFE (analog front end) is connected with RC filter network, the MCU is connected with light MOS tube drive circuit by SPI, the MCU is electrically connected with rechargeable battery.The utility model in the high voltage supercapacitor monomer is stored energy by rechargeable battery, avoid energy loss consumptive waste, reach the goal of active equalization, using rechargeable battery and the fast power supply mode of DC / DC isolated bidirectional power supply, active equalization for low voltage average value voltage's battery, shortens equalization time.

An equalization control circuit for prolonging the service life of a battery energy storage system comprises a battery management system and an equalization circuit module electrically connected with the battery management system. The equalization circuit module comprises an inter-cell equalization circuit and an inter-module equalization circuit; the n single batteries of the whole module are averagely divided into m battery packs, each battery pack comprises k single batteries, m is greater than or equal to 2, and k is greater than or equal to 2; the inter-cell equalization circuit is arranged between every two adjacent single batteries in the battery pack; k single batteries connected in series in each battery pack are regarded as a whole, the positive electrode of the first battery serves as the positive electrode of the battery pack, the negative electrode of the kth battery serves as the negative electrode of the battery pack, the inter-module equalization circuit is connected between the positive electrode and the negative electrode of each battery pack, and the inter-module equalization circuit is further connected with the whole module through the transformer. According to the utility model, the electric quantity transfer between the adjacent single batteries in the battery pack and the bidirectional electric quantity transfer from any battery pack between the battery modules to the whole can be realized.

The embodiment of the invention discloses an electric energy balancing method and device, electronic equipment and a storage medium. The charge states of a plurality of electric energy storage units included in the energy storage system are obtained, and the electric energy storage units have a connection relation; based on the charge state, determining a first electric energy storage unit needing to be discharged and a second electric energy storage unit needing to be charged in the plurality of electric energy storage units; determining a first target charge state and a second target charge state based on the number of the first electric energy storage units and the number of the second electric energy storage units; and controlling the first electric energy storage unit to discharge the second electric energy storage unit by taking the first target charge state as a discharge target of the first electric energy storage unit and the second target charge state as a charge target of the second electric energy storage unit. Therefore, the electric energy equalization rate and the electric energy equalization efficiency can be improved.

The utility model discloses a modularized layered fast equalization circuit, comprising 4N batteries, the 4N batteries are connected in series, every four adjacent batteries form a battery pack, each battery pack is connected with an intra-pack equalization module to form a battery module, N battery modules are connected in series, each battery module is connected with an inter-pack equalization module, and the N inter-group equalization modules are connected in parallel. According to the utility model, the equalization time is shortened, and the equalization efficiency is improved. According to the utility model, a plurality of single batteries in the battery pack can be equalized, and a battery module composed of a plurality of single batteries can be equalized, so that the battery equalization accuracy and equalization efficiency are improved.

This invention relates to the field of battery monitoring technology, specifically to an external access charging and discharging data acquisition module for a power battery pack. The method includes: a cell group, a single cell voltage monitoring unit, an equalization unit, a microcontroller unit, a communication unit, and a power supply unit. The cell group consists of N cells connected in series. The single cell voltage monitoring unit has a differential channel for each cell and converts it to a single-ended voltage via differential / single-ended conversion. The equalization unit has a dissipation branch for each cell containing an isolated gate driver, an MCU-controlled N-channel MOSFET, and a power resistor, along with an overcurrent fuse and overvoltage clamp. The microcontroller unit collects the single-ended voltage of each cell via a low-pass filter and controls the equalization. The algorithm averages and calibrates the voltage for each cell ≥10 times, using the lowest voltage as a reference. The equalization is activated when the difference is ≥ a threshold. The collection is paused during the hold period and then cycled again. This method is applicable to both charging and discharging. The communication unit connects to a CAN controller and transceiver via SPI, encapsulating the single cell voltage into a two-byte CAN frame for uploading to the bus. The power supply unit obtains a first bus from the total voltage drop for monitoring and equalization, and then linearly regulates it to obtain a second bus for the MCU and communication. This invention can solve the problems of inconsistent voltage / SOC during the charging and discharging process of series-connected power cells, making it difficult to accurately collect and quickly equalize the data without modifying the original system; the data collection process is easily affected by the equalization current; and there is a lack of remote online monitoring.