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Battery system for distributing flow energy storage current or voltage and control method

A battery system and liquid flow energy storage technology, which is applied in the direction of fuel cells, secondary batteries, fuel cell additives, etc., can solve the problems of reduced battery life, large module polarization, and system performance degradation, so as to prolong the service life, Improved performance, simple operation

Active Publication Date: 2011-08-10
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. There are individual differences in the battery modules or subsystems that make up the battery system, mainly in electrode area, electrode polarization, liquid pipelines, and circuit connections. Therefore, the current of each module or subsystem that makes up the battery system during charging and discharging Cannot be distributed proportionally or the voltage cannot be distributed according to the number of cells
[0006] 2. The battery module or subsystem has a certain design current density, and the performance and life of the battery system are directly related to the working current density of the system. For example, the current of each module or subsystem during the charging and discharging process cannot be proportionally distributed Make some battery modules or subsystems work outside the design current density range, which reduces the performance and service life of the battery system
[0007] 3. The battery module or subsystem has a certain design voltage working range, which is determined by the number of single batteries in the module or system. If the voltage of each module or subsystem is not distributed according to the number of batteries, some battery modules or subsystems will The system works outside the designed voltage range and some battery modules or subsystems do not reach the designed voltage range, which makes some modules overpolarized and reduces the performance and service life of the battery system
[0008] 4. Differences in battery modules or subsystems may change continuously during the charging and discharging process of the battery system, which may cause the current of each module or subsystem that makes up the battery system to be unable to be distributed proportionally or the voltage to be proportional to the charging and discharging process. The phenomenon of battery cell allocation is further exacerbated, and this accumulation will lead to a decrease in system performance and a reduction in the life of some batteries in the system
From the current technology point of view, a simple, easy and relatively low-cost method has not been found to distribute the current and voltage of the flow battery system.

Method used

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  • Battery system for distributing flow energy storage current or voltage and control method

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Experimental program
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Effect test

Embodiment 1

[0038] as attached figure 2The current distribution system shown is composed of two battery modules, 15 and 16 are two liquid flow battery modules with the same number of battery cells, the electrode area of ​​each battery module can be the same or different, and the two modules are connected in parallel through the circuit The electrolyte pipelines of the two battery modules are also connected in parallel.

[0039] The positive electrode electrolyte flows out from the positive electrode electrolyte storage tank 3, flows through the positive electrode pump 5 and the positive electrode electrolyte inlet master valve 7 in sequence, then flows through the positive electrode inlet valves 11 and 13 respectively and enters the positive electrodes of the battery modules 15 and 16, and after charging and discharging After the electrochemical reaction in the process, the positive electrode electrolyte solution flows out from the battery modules 15 and 16 into the positive electrode el...

Embodiment 2

[0047] as attached image 3 The voltage distribution system shown is composed of two battery modules, 15 and 16 are two liquid flow battery modules with the same number of battery cells, the number of battery cells in each battery module can be the same or different, and the two modules are connected in series through a circuit However, the electrolyte pipelines of the two battery modules are still connected in parallel.

[0048] The positive electrode electrolyte flows out from the positive electrode electrolyte storage tank 3, flows through the positive electrode pump 5 and the positive electrode electrolyte inlet master valve 7 in sequence, then flows through the positive electrode inlet valves 11 and 13 respectively and enters the positive electrodes of the battery modules 15 and 16, and after charging and discharging After the electrochemical reaction in the process, the positive electrode electrolyte solution flows out from the battery modules 15 and 16 into the positive...

Embodiment 3

[0056] Figure 4 The shown liquid flow energy storage battery current distribution system is composed of several battery modules 11 with the same number of batteries connected in parallel. In addition to the battery modules 11, the current distribution system also includes current detectors 12, electromagnetic flowmeters 13 and The electric valve 14, and the current detector 12, the electromagnetic flowmeter 13 and the electric valve 14 are connected with the controller 2 through the control circuit. The electrolyte pipelines of each battery module are connected in parallel.

[0057] The positive electrode electrolyte flows out from the positive electrode electrolyte storage tank 3, flows through the positive electrode pump 5 and the positive electrode electrolyte inlet master valve 7 in sequence, and then is distributed to each battery module 11, after the electrochemical reaction in the charging and discharging process, it is discharged from each battery module 11 The posit...

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Abstract

The invention relates to design of a system formed by parallel connection, series connection or series-parallel connection of modules or sub-systems and a corresponding current or voltage distribution control method thereof. The flow energy storage battery system is formed by parallel connection or series connection of a plurality of the flow energy storage battery modules or the sub-systems which are in line with certain requirements by circuits, and current or voltage detection devices are arranged in the circuits. The modules or the sub-systems are connected through liquid pipelines, identical or different electrolyte storage tanks are used, and flow rate detection and regulation devices are arranged in the liquid pipelines. By connecting a control circuit with a controller, the purpose of controlling current and voltage by controlling flow rate can be achieved. By adopting the current and voltage control method of the flow energy storage battery system, the distribution of the current of all the modules in the flow energy storage battery system according to requirements and the distribution of the charge-discharge voltage of all the battery modules according to the number of batteries can be ensured, so that all the battery modules have the same charge-discharge state.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage battery system integration, in particular to a system design with modules or subsystems connected in parallel or in series in a circuit and a corresponding current or voltage distribution control method. Background technique [0002] With the increasingly prominent energy contradictions in the world, the demand for renewable energy such as wind energy and solar energy in various countries is increasing. For our country, the development of renewable energy power generation technologies such as solar energy and wind energy is the key to solving my country's energy security and realizing energy conservation. An important way to arrange the basic national policy. [0003] Since the electric energy provided by wind energy or solar energy is not stable and continuous, it is impossible to directly supply power to the load and provide the required electric energy. Therefore, it is necessary to dev...

Claims

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Application Information

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IPC IPC(8): H01M8/24H01M8/18H01M8/04H01M10/36H01M10/48H01M10/42H01M8/04746H01M8/04858
CPCY02E60/528Y02E60/12Y02E60/10Y02E60/50
Inventor 邹毅张华民刘宗浩马相坤史丁泰
Owner DALIAN RONGKE POWER