10results about How to "Improve uniform efficiency" patented technology

The invention belongs to the field of battery health state monitoring, and discloses a lithium battery multi-threshold active and passive equalization control method and system.According to the method, by collecting current, voltage and SOC data of a lithium battery in real time and combining a multi-threshold judgment mechanism, the dynamic change of a battery pack can be reflected more accurately, equalization operation is triggered in time, and the equalization efficiency is improved. The problem of over-equalization or under-equalization possibly caused by a single-threshold strategy is effectively avoided; meanwhile, the intelligent screening of the active equalization strategy and the passive equalization strategy further improves the equalization efficiency and effect, and ensures that the voltage difference and the SOC difference between the single batteries in the battery pack are kept in a reasonable range, thereby prolonging the service life of the battery pack, improving the overall performance, and reducing the potential safety hazard. The method can provide powerful guarantee for stable operation of the energy storage system.

The invention relates to a storage battery dynamic balance management method and device, a storage medium and electronic equipment. The balance efficiency and the balance precision of storage battery dynamic balance management can be improved. The method comprises: determining a first difference value between a working parameter of each single battery in a storage battery pack and an average working parameter of the storage battery pack, the average working parameter of the storage battery pack being an average value of the working parameters of each single battery in the storage battery; under the condition that the absolute value of the first difference value is greater than a first threshold value, performing dynamic balance management on the storage battery pack based on a constant current control strategy; and under the condition that the absolute value of the first difference value is greater than a second threshold value and less than the first threshold value, carrying out dynamic balance management on the storage battery pack based on a constant voltage control strategy.

The invention discloses a small-size high-efficiency large-current lithium battery active equalization circuit and a control method thereof, the small-size high-efficiency large-current lithium battery active equalization circuit comprises active equalization modules which are connected in parallel between two connected battery cells, and each active equalization module is composed of four switching tubes and a group of resonance branch circuit which is formed by connecting an inductor and a capacitor in series; n-1 active equalization modules are needed for a battery pack composed of N battery cells. The LC series branch serves as an energy temporary storage unit to replace a traditional inductance type single inductor or capacitance type multiple capacitors, the number of elements is reduced, meanwhile, low-loss energy transfer is achieved through resonance characteristics, and the equalization scheme has the advantages of being small in size, large in equalization current, small in equalization energy loss between battery cells, high in efficiency and the like.

This utility model discloses a cell balancing system, including a balancing module and a balancing control module. The balancing module includes multiple independently configured isolated power supply units and power supply units that supply power to each isolated power supply unit. Each cell in the cell pack is equipped with an isolated power supply unit, and each isolated power supply unit is connected to a balancing control module. The balancing control module sends independent balancing control signals to each isolated power supply unit. Under the control of the balancing control module, each isolated power supply unit starts or stops charging its corresponding cell, thereby achieving capacity balancing among the cells in the cell pack. The cell pack includes multiple cells connected in series, and the cell pack forms a loop with a bidirectional inverter to achieve charging and discharging operations with the power grid through the bidirectional inverter. The cells are lithium iron phosphate batteries. This utility model can achieve efficient balancing of the cells in the cell pack, with no limit on the number of cells to be balanced, low cost, and is suitable for widespread application.

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.

This invention discloses a method for generating battery balancing strategies in energy storage BMS based on temperature compensation, belonging to the field of battery management technology, and is used to solve the problem of strategy misjudgment caused by passive balancing heat interference with temperature acquisition. First, a thermal coupling matrix is ​​constructed based on the PCB thermal conduction characteristics, fusing global Joule heat and local balancing residual heat to reconstruct the core temperature of a single cell. Then, the core temperature is used to decouple the dynamic internal resistance voltage drop, mapping the measured voltage to a virtual isothermal voltage, eliminating temperature difference interference. Finally, a game-theoretic cost function including consistency gain and thermally induced observation noise is constructed to predict the adverse impact of balancing heat on measurement accuracy. Commands are generated only when the gains cover the measurement risks, effectively preventing strategy oscillations and improving the balancing efficiency and operational stability of the energy storage system.

The application provides a battery charging management control system, method, device and medium, and belongs to the technical field of battery management. The system comprises: a first battery CELL1 and a second battery CELL2 connected in series; a first capacitor module connected in parallel across the first battery CELL1; a second capacitor module connected in parallel across the second battery CELL2; a first equalization circuit connected in parallel between the first capacitor module and the first battery CELL1; a second equalization circuit connected in parallel between the second capacitor module and the second battery CELL2; a first voltage detection circuit connected in parallel across the first battery CELL1; a second voltage detection circuit connected in parallel across the second battery CELL2; and a microcontroller MCU connected with the first equalization circuit, the second equalization circuit, the first voltage detection circuit and the second voltage detection circuit respectively. Intelligent management of multiple series-connected batteries is realized.

The embodiment of the present invention provides a balancing strategy and system based on SOC maximum value, which relates to the field of power battery technology. The balancing strategy includes: obtaining the single SOC value and the average SOC value of the battery pack; judging whether the battery pack needs to perform a balancing operation; in the case where it is judged that the battery pack needs to perform a balancing operation, determining the single SOC extreme value and the single SOC sub-extreme value of the battery pack; taking the intermediate value of the average SOC value and the single SOC sub-extreme value as the target SOC, balancing the battery pack. The balancing strategy and system predict the SOC of the battery pack, and timely balance the single cell with the highest SOC during charging and the single cell with the lowest SOC during discharging, thereby ensuring full utilization of the battery pack capacity, achieving balancing of the entire battery pack, and achieving high balancing efficiency.

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.

The embodiment of the invention provides an electric quantity balancing method, a chip, equipment and a storage medium, and the method comprises the steps: carrying out the electric quantity detection of a plurality of battery cells connected in series in a battery pack, and determining a first battery cell with the highest electric quantity and a second battery cell with the lowest electric quantity from the plurality of battery cells; under the condition that the number of the separated battery cells between the first battery cell and the second battery cell is greater than or equal to a preset number threshold value and the battery pack is in a charging state, determining a first target battery cell of which the electric quantity is lower than that of the first battery cell from other battery cells adjacent to the first battery cell; and controlling the first battery cell to transmit energy to the first target battery cell. According to the scheme, the equalization efficiency and the response speed can be improved, the equalization control logic is simplified, and the application requirements of a high-capacity and multi-cell battery pack are met.