Equalizing charging circuit for battery pack, and control circuit for equalizing charging circuit

A technology of balanced charging and battery packs, applied in the field of electric power, can solve the problems of large number of switches, large losses, and inapplicability to large-scale battery packs, etc., and achieve the effect of improving the equalization effect and reducing energy consumption

Pending Publication Date: 2018-02-02
STATE GRID JIANGSU ELECTRIC POWER CO LTD TAIZHOU POWER SUPPLY BRANCH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the past ten years, equalization strategies based on various types of circuits and electronic devices have emerged, but there are various deficiencies due to the limitations of circuit structures and electronic components: for example, the LC oscillation circuit equalization strategy based on the principle of power tra...

Method used

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  • Equalizing charging circuit for battery pack, and control circuit for equalizing charging circuit
  • Equalizing charging circuit for battery pack, and control circuit for equalizing charging circuit
  • Equalizing charging circuit for battery pack, and control circuit for equalizing charging circuit

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Embodiment Construction

[0020] The invention will be described in detail below in conjunction with specific embodiments.

[0021] Due to the difference between the single cells, the internal voltage difference will be caused during the recharging and discharging process of the battery inside the battery pack. This difference will increase sharply with the increase in the number of uses, destroying the effectiveness of the battery pack, and causing economic and technical problems. This phenomenon is called unbalanced phenomenon, including one or more single battery voltages that are too high (compared to most of the single batteries in the battery pack, the same below), too low, and high-low mixing. For the above unbalanced phenomenon, we need to adopt the necessary balanced control strategy. No matter what kind of circuit structure or electronic components are used in technology, we can classify the common balanced control methods in principle, the most important of which is to compare method and mea...

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Abstract

The invention relates to the field of electric power technology, in particular to a battery pack equalizing charging circuit and its control structure. Based on the above equalization structure, when the voltage of individual battery cells is too low, the inverter module is used to charge the low-voltage battery unit, and then the chopper module is used to charge the whole to complete the key task of balancing. When it is high, use the chopper module to transfer the power of the high-voltage battery unit to other low-voltage battery units, and then use the inverter module to charge and discharge the whole to achieve balanced charging. Through the balanced structure of this scheme, the two modules are combined with each other The synergistic effect reduces the equalization time and at the same time ensures the equalization accuracy, avoids the unfavorable situation that a single equalization module cannot adapt to various unbalanced situations, and realizes the improvement of the equalization function and effect.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a battery pack equalizing charging circuit and its control structure. Background technique [0002] During the normal operation of the power system, it is inevitable to encounter unexpected situations such as power outages and voltage instability, which lead to the need to cut off the power supply to ensure the safety of the equipment. In order to avoid abnormal operation of power equipment caused by cutting off the power supply, it is often necessary to use Various types of battery energy storage systems, battery energy storage systems as backup power sources and energy storage devices are an important part of the power industry. With the improvement of battery types and performance, the capacity and power of batteries continue to increase, but At this stage, the capacity of a single battery and the ability to store power are still insufficient to meet the voltage and po...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0018
Inventor 祁晖冯伟杨乐蒋伟吴倩段小峰
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD TAIZHOU POWER SUPPLY BRANCH
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