A liquid metal battery pack balance control method and fault-tolerant system
A liquid metal battery, liquid metal technology, applied in the field of electrochemical energy storage, can solve problems such as battery failure, and achieve the effects of preventing overcharge and overdischarge, prolonging working life, and improving available capacity
Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0005] In view of the defects of the prior art, the purpose of the present invention is to solve the reliability and safety problems caused by the failure of the battery in the liquid metal battery pack in the prior art due to the failure of the battery in the pack or the serious decline in performance during the actual use, and provide A liquid metal battery pack system structure design scheme with redundant batteries and its control strategy. This structure enables the liquid metal battery pack to have fault tolerance, thereby improving the reliability of the battery pack. Carry out effective balance control, improve energy utilization, prevent overcharge and overdischarge of single cells in the battery pack, and prolong their service life
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[0069] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0070] The present invention provides a system structure of a liquid metal battery pack with redundant batteries and its control method for the failure or failure of the batteries in the liquid metal battery pack to cause the entire battery pack to fail to work normally and even cause safety problems. The battery pack has fault tolerance capability, thereby improving the working reliability of the battery pack. At the same time, its control method can effectively balance the batteries in the battery pack, improve energy utilization, prevent overcharging and over-discharging of the battery cells in t...
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A liquid metal battery pack equalization control method and fault-tolerant system are disclosed. The method comprises the following steps: (1) collecting the information of each battery cell, whereinN is the number of battery cells required for normal operation, M is the number of spare battery cells; 2, judging whether the battery cell is invalids or not according to the information of each battery cell, if so, entering the step 3, otherwise, enter the step 4; 3) bypassing the invalid battery cell and connecting the invalidated battery cell to the standby battery to ensure the normal operation of the battery pack; (4) judging the charging and discharging state of the battery pack according to the positive and negative battery current, and if the current is negative, proceeding to step (5); If the current is positive, proceeding to step (6); (5) performing charge equalization control; and (6) performing discharge equalization control. The fault-tolerant structure and the control strategy thereof can effectively solve the problem that the battery pack cannot continue to serve due to the failure or excessive aging of the battery cell, and equalization control of the battery pack isimplemented in an active reconfiguration mode.
Description
technical field [0001] The invention belongs to the field of electrochemical energy storage, and more specifically relates to a method for balancing a liquid metal battery pack and a fault-tolerant system. Background technique [0002] As a new type of electrochemical energy storage technology, liquid metal battery has the advantages of large capacity, high efficiency, low cost and long life due to its special structure design. It has broad application prospects in the field of large-scale energy storage. In order to meet the voltage and capacity level requirements of a large-capacity energy storage system, it is generally necessary to connect a large number of battery cells in series and parallel to form a group. However, during the use of the battery pack, the inconsistency of each battery cell is further enlarged due to the differences in the manufacturing process and application environment, and the battery has different aging degrees. The battery cell with faster perfor...
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IPC IPC(8): H02J7/00
CPCH02J7/0016H02J7/0019H02J7/0022
Inventor 王康丽张娥蒋凯徐成刘国安程时杰
Owner HUAZHONG UNIV OF SCI & TECH