Floating charge protection type lithium iron phosphate storage battery and application thereof to direct current system of electric power engineering

A technology of lithium iron phosphate and storage battery, which is applied in the field of floating-charge protection type lithium iron phosphate storage battery to achieve the effects of improving durability, realizing independent chemical balance, and solving the problem of small balanced current

Inactive Publication Date: 2014-11-12
上海凯华电源成套设备有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to carry out theoretical analysis and propose test content for lithium iron phosphate battery through feasibility study, use test data to verify and compile design practical d

Method used

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  • Floating charge protection type lithium iron phosphate storage battery and application thereof to direct current system of electric power engineering
  • Floating charge protection type lithium iron phosphate storage battery and application thereof to direct current system of electric power engineering
  • Floating charge protection type lithium iron phosphate storage battery and application thereof to direct current system of electric power engineering

Examples

Experimental program
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Effect test

Embodiment 1

[0148] The electrolyte uses a five-component solvent, and the mass ratio of the solvent is EC (ethylene carbonate): EMC (ethyl methyl carbonate): DMC (dimethyl carbonate): DEC (diethyl carbonate): PC (propylene carbonate) 60:5:15:15:5, add redox shuttle additive DDB (2,5-di-tert-butyl-1,4-dimethoxybenzene), its weight percentage is 1%, to obtain redox-containing Electrolyte with Fraxel additive. The electrolytic solution obtained above, together with the positive electrode, the negative electrode and the diaphragm, is made into a fresh initial state self-balancing battery according to the above-mentioned battery manufacturing method.

Embodiment 2

[0150] After recycling the battery prepared in Example 1 for 1000 times, it was maintained in a low dew point environment in the liquid injection room, and the detachable safety valve 5 was disassembled. Electrolyte (the electrolyte prepared in Example 1) supplement and waste gas release, check the state of the sealing gasket, assemble the detachable safety valve 5 according to the set torque after maintenance, and press the sealing gasket 6 to complete the internal maintenance.

Embodiment 3

[0161] like Figure 18 As shown, the battery pack system consists of N modules connected in series to form a battery pack system. Each module is equipped with a BPD. The BPD communicates with the control host computer.

[0162] The composition of BPD is as follows Figure 19 As shown, the entire BPD is composed of a connector, a sampling circuit, a balanced charging circuit, a balanced discharging circuit, and a communication chip. Figure 19 The entire BPD device 100 consists of multiple parts. The connector 200 is used to connect the temperature sensor reserved in the module, the wiring harness for collecting single voltage and the communication wiring harness with other BPDs. The sampling circuit 300 converts the collected analog signal into a digital signal and transmits it to the single chip microcomputer for calculation and processing. Balanced discharge circuit 400, when the information collected by the sampling circuit is sent to the single-chip microcomputer, the ...

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Abstract

The invention discloses a floating charge protection type lithium iron phosphate storage battery which comprises a lithium iron phosphate positive electrode, a lithium iron phosphate negative electrode, an isolating membrane, an electrolyte and a shell, wherein the shell comprises a cover plate component and a shell body; the cover plate component comprises a cover plate, a positive pole component, a negative pole component, a liquid injection hole and a detachable safety valve; the liquid injection hole is formed in the center of the cover plate and is provided with a threaded flange; the liquid injection hole is raised towards the outer side of the cover plate to form a tubular cavity; the diameter of the tubular cavity is greater than that of a needle head of a liquid injection machine; the inner wall of the tubular cavity is provided with threads; the detachable safety valve is arranged at the liquid injection hole; after the safety valve is detached down, the electrolyte of the battery can be repeatedly supplemented. When being applied to the direct current system of electric power engineering, the battery can be used as a standby power supply of a power plant and a transformer substation. As for the wiring mode of the direct current system of the lithium iron phosphate battery, except that a storage battery body externally adopts automatic current sharing, storage battery protection devices are connected in parallel at two ends of each storage battery; the capacity of a lithium iron phosphate storage battery pack is properly no more than 200Ah when the battery is used in the substations of 110KV or below. By adopting the floating charge protection type lithium iron phosphate storage battery, the potential safety hazard of the storage battery in long-term floating charge operation is eliminated.

Description

technical field [0001] The invention relates to a floating-charge protection type lithium iron phosphate storage battery, especially the battery is used in a direct current system of electric power engineering, and can be used as a backup power supply of a power plant and a substation. Background technique [0002] With the advancement of the national smart grid, the application of advanced technologies for environmental protection, energy conservation and emission reduction. The development of new equipment with high efficiency, energy conservation, advanced environmental protection, and resource recycling has become the first choice. Lithium iron phosphate battery has long-term significance as a battery for substation DC power supply system. [0003] With the development of modern industrial society, the consumption of fossil fuels has expanded rapidly, especially the fuel consumption of transportation. As a new type of electric energy storage carrier, lithium-ion battery...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M2/12H01M2/04H01M2/36H02J7/00H02J9/00
CPCH01M10/0525H01M2220/10H02J7/00H01M50/147H01M50/325H01M50/60H01M50/636Y02E60/10
Inventor 孙茗於崇干刘百震盛和乐杨忠亮侯耀华王东蒋新华陈萍贾江涛刘思刘扬侯敏赵文鹏曹辉
Owner 上海凯华电源成套设备有限公司
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