Lithium-ion battery electrolyte circulation and purification closed-circuit system

A lithium-ion battery and closed-circuit system technology, which is applied in the field of electrolyte circulation and purification closed-circuit systems, can solve the problems of inability to update the electrolyte, damage the electrode material structure, and accelerate lithium-ion batteries, etc., to solve the problem that the electrolyte cannot be updated and improved. Temperature distribution, the effect of solving the life attenuation

Active Publication Date: 2021-02-05
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the cycle, the electrolyte composition of lithium-ion batteries will change, such as the electrolyte LiPF 6 content decreased, H 2 The content of harmful substances such as O, HF, and a series of free radicals increases. These changes will accelerate the occurrence of side reactions inside the lithium-ion battery, damage the structure of the electrode material, and accelerate the aging of the battery.
However, the lithium-ion battery for ultra-large-capacity energy storage in the above-mentioned patent can only monitor the operating state of the battery in real time through the monitoring module, and cannot conveniently update the electrolyte within the battery life cycle to improve the service life of the battery.

Method used

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  • Lithium-ion battery electrolyte circulation and purification closed-circuit system

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Embodiment 1

[0021] like figure 1 As shown, Embodiment 1 of the present invention provides a closed-circuit system for electrolyte circulation and purification of a lithium-ion battery, wherein the lithium-ion battery is provided with a battery case 1 and a plurality of negative plates 2 arranged alternately in the battery case 1 and a plurality of positive plates 3 , a separator 4 located between adjacent negative plates 2 and positive plates 3 , and an electrolyte 5 disposed in the battery case 1 . At the same time, the lithium-ion battery is also provided with a negative current collector 6 and a positive current collector 7, wherein the negative current collector 6 is connected to the top of the negative plate 2 and extends out of the battery case 1, and the positive current collector 7 is connected to the top of the positive plate 3. connected and extended out of the battery casing 1 to form a complete lithium-ion battery structure. The present invention also includes an electrolyte ...

Embodiment 2

[0029] This embodiment provides a working case of a lithium-ion battery using the electrolyte circulation and purification closed-circuit system 8 .

[0030] If there is no electrolyte circulation and purification closed-circuit system 8, after 1,000 cycles of charging and discharging lithium-ion batteries for ultra-large capacity energy storage, the content of HF in the electrolyte 5 will reach 120ppm, and the H 2 When the O content reaches 300ppm, the battery capacity has a capacity fading of 8%.

[0031] Set the lithium-ion battery for ultra-large capacity energy storage in the electrolyte circulation and purification closed-circuit system 8. The electrolyte 5 circulates in the system. Under normal circumstances, the monitoring probe of the HF concentration monitoring unit in the monitoring module 9 works intermittently. The purification threshold of HF Set to 10ppm. When the HF concentration in the electrolyte 5 is higher than the threshold, the monitoring probe works con...

Embodiment 3

[0035] This embodiment provides another working case of a lithium-ion battery using the electrolyte circulation and purification closed-circuit system 8 .

[0036] If there is no electrolyte circulation and purification closed-circuit system 8, after 3,000 cycles of charging and discharging lithium-ion batteries for ultra-large capacity energy storage, the electrolyte LiPF in the electrolyte 5 6 The content dropped from the original 2mol / L to 1.8mol / L.

[0037] An ultra-large-capacity lithium-ion battery for energy storage with an electrolyte circulation and purification closed-circuit system 8. The electrolyte 5 circulates in the system. Under normal circumstances, the monitoring probe of the ion concentration monitoring unit in the monitoring module 9 works intermittently to detect the electrolyte. 5 kinds of ion concentrations. When the monitored concentration of Li+ in the electrolyte 5 continues to be lower than 2% of the normal concentration, the ion concentration monit...

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Abstract

The invention provides an electrolyte circulation and purification closed-loop system for a lithium ion battery. The lithium ion battery is provided with a battery casing, a plurality of negative plates and a plurality of positive plates arranged alternately in the battery casings, separating plates located between the adjacent negative and positive plates, and an electrolyte disposed in the battery casing. The electrolyte circulation and purification closed-loop system is provided with a monitoring module, a heat exchange module, a component control module, a drive module and a management control module, wherein the monitoring module, the heat exchange module, the component control module and the drive module are all in communication with the interior of the battery casing and are electrically connected with the management control module. The electrolyte circulation and purification closed-loop system has a function of monitoring and proactively adjusting the components of the electrolyte in the battery in real time, and a function of monitoring the temperature of the electrolyte and maintaining the electrolyte stable.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte circulation and purification closed-circuit system for lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in mobile energy storage, electric vehicles, large-scale grid energy storage and other fields due to their excellent characteristics such as high energy density, high output voltage, low self-discharge rate, long service life, no memory effect and environmental friendliness. . In the prior art, most of the batteries used in large-scale power grid energy storage power stations are composed of a large number of small-capacity lithium-ion batteries connected in series and parallel, which puts forward extremely high requirements on the consistency of each lithium-ion battery cell in the battery stack. It also makes the battery management system of the energy storage power station very complicated, which makes t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/48
CPCH01M10/4214H01M10/4242H01M10/48H01M10/486Y02E60/10
Inventor 颜果春刘越李新海王志兴郭华军王接喜胡启阳彭文杰
Owner CENT SOUTH UNIV
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