A hybrid energy storage system using a retired battery pack and its control method
An energy storage system and control method technology, applied in the field of energy storage systems, can solve problems such as difficulty in ensuring the reliability and durability of energy storage systems, large differences in performance of battery packs, and inability to solve the consistency of performance of battery cells, etc., to achieve Effects of system cost reduction, total capacity increase, and durability improvement
Active Publication Date: 2022-08-02
TSINGHUA UNIV
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Problems solved by technology
[0003] However, due to the different production companies and batches of power batteries, and the different working conditions of batteries before retirement, the performance of retired battery packs varies greatly.
On the one hand, generally speaking, retired batteries can only be disassembled at the module level, and the sorting and reorganization of retired batteries with modules as the basic unit cannot solve the performance consistency of battery cells; on the other hand, simply composed of retired batteries It is difficult to guarantee the reliability and durability of the energy storage system with large-capacity energy storage battery packs
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[0031] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
[0032] The invention provides a hybrid energy storage system using a retired battery pack. In the system, the echelon utilization of the retired battery is mainly small capacity, and the "controlled low current" method is charged and discharged. For the hybrid energy storage system , the retired battery pack acts as an "energy supplement" unit. Therefore, while increasing the total capacity of the entire energy storage system, the system cost per unit capacity is reduced.
[0033] like figure 1 As shown, the present invention provides a hybrid energy storage system utilizing a retired battery pack, which includes a minimum energy storage system, a retired battery pack and a bidirectional DC / DC (bidirectional power converter). Among them, the minimum energy storage system includes PCS (power conversion unit), EMS (energy management unit) and energy sto...
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The invention relates to a hybrid energy storage system using a retired battery pack and a control method thereof, comprising: a minimum energy storage system, a retired battery pack and a bidirectional power converter; the minimum energy storage system includes a power conversion unit, an energy management unit and a Energy storage battery pack; the DC side of the power conversion unit is respectively connected to the output of the energy storage battery pack and the high voltage side of the bidirectional power converter, and the AC side of the power conversion unit is merged into the user side power grid as the output end of the hybrid energy storage system; The low-voltage side of the bidirectional power converter is connected to the output of the retired battery pack, which is used for charging or discharging management of the retired battery pack in different working modes of the hybrid energy storage system; the energy management unit is used to meet the power demand of the user-side grid load. As well as the state of charge of the retired battery pack and the energy storage battery pack, the working mode of the hybrid energy storage system is determined as "discharge mode" or "charge mode". The invention can be widely used in the field of energy storage system design.
Description
technical field [0001] The invention relates to a hybrid energy storage system using a retired battery pack and a control method thereof, belonging to the technical field of energy storage systems. Background technique [0002] In recent years, with the arrival of the decommissioning tide of power batteries, the cascade utilization of retired power batteries has been paid more and more attention by related industries. [0003] However, due to the different production enterprises and production batches of power batteries, the battery usage conditions before retirement are different, and the performance of retired battery packs is quite different. On the one hand, generally speaking, retired batteries can only be disassembled to the module level, and the sorting and reorganization of retired batteries with modules as the basic unit cannot solve the performance consistency of battery cells; It is difficult to ensure the reliability and durability of the energy storage system w...
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IPC IPC(8): H02J15/00H02J3/32H02J7/00
CPCH02J15/00H02J3/32H02J7/0068
Inventor 黄勇田光宇孔令召
Owner TSINGHUA UNIV