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Restore method of liquid-state metal battery

A technology of a liquid metal battery and a repair method, applied in the field of energy storage, can solve the problems of waste of liquid metal batteries, reduce the difficulty and cost of operation and maintenance of battery stacks, etc., so as to reduce the difficulty and cost of operation and maintenance, save battery costs, and reduce battery wasteful effect

Active Publication Date: 2018-02-23
CHINA XD ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a repair method for liquid metal batteries, which solves the serious waste of liquid metal batteries and reduces the difficulty and cost of battery stack operation and maintenance. The performance of liquid metal batteries repaired by this method is not obvious. Attenuation, still can continue to use normally

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0048]Adopt the present invention to repair short-circuited Li / Pb liquid metal battery (operating temperature 350 ℃, cut-off voltage 0.9V), repair method mainly comprises the following steps:

[0049] (1) Stop the battery and raise the battery temperature to 450°C;

[0050] (2) Leave the battery at 450°C for 6 hours;

[0051] (3) Charge the battery at a constant voltage of 0.9V;

[0052] (4) The current density of the battery is lower than 100mA / cm 2 Then turn to constant current discharge, the discharge current is 0.5C, and the discharge depth is 10% DOD;

[0053] (5) After discharging, charge the battery with a constant current until it is fully charged, and the charging current is 0.5C;

[0054] (6) Go to step (4), and cycle 10 times like this;

[0055] (7) Discharge the battery with a constant current, the discharge current is 0.05C, and the discharge depth is 10% DOD;

[0056] (8) Charge the battery with a constant current until it is fully charged after discharge, a...

Embodiment 2

[0060] Using the present invention to repair micro-short-circuit Li-Sn / Sb liquid metal batteries (working temperature 450°C, cut-off voltage 1.2V), the repair method mainly includes the following steps:

[0061] (1) Stop the battery and raise the working temperature of the battery to 650°C;

[0062] (2) Leave the battery at 650°C for 7 hours;

[0063] (3) Charge the battery at a constant voltage of 1.2V;

[0064] (4) The current density of the battery is lower than 100mA / cm 2 Then turn to constant current discharge, the discharge current is 0.75C, and the discharge depth is 20% DOD;

[0065] (5) After discharging, charge the battery with a constant current until it is fully charged, and the charging current is 0.75C;

[0066] (6) Go to step (4), so circulate 15 times;

[0067] (7) Discharge the battery with a constant current, the discharge current is 0.075C, and the discharge depth is 30% DOD;

[0068] (8) After discharging, charge the battery with a constant current unt...

Embodiment 3

[0072] Using the present invention to repair micro-short-circuit Li-Pb / Sb liquid metal batteries (working temperature 500°C, cut-off voltage 1.1V), the repair method mainly includes the following steps:

[0073] (1) Stop the battery and raise the working temperature of the battery to 800°C;

[0074] (2) Leave the battery at 800°C for 8 hours;

[0075] (3) Charge the battery at a constant voltage of 1.1V;

[0076] (4) The current density of the battery is lower than 100mA / cm 2 Then turn to constant current discharge, the discharge current is 0.75C, and the discharge depth is 25% DOD;

[0077] (5) After discharging, charge the battery with a constant current until it is fully charged, and the charging current is 0.75C;

[0078] (6) Go to step (4), so cycle 20 times;

[0079] (7) Discharge the battery with a constant current, the discharge current is 0.075C, and the discharge depth is 35% DOD;

[0080] (8) After discharging, charge the battery with a constant current until i...

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Abstract

The invention discloses a restore method of a liquid-state metal battery. The restore method comprises the steps of 1) stopping working when a fault occurs in the battery; 2) increasing a working temperature of the battery, and allowing the battery to stand; 3) performing constant-voltage charging on the battery, wherein a charging voltage is a cutoff voltage when the battery normally works; 4) performing constant-current discharging on the battery; 5) performing constant-current charging on the battery until the battery is charged fully after discharging is ended; 6) forwarding to the step 4)and circulating for many times; 7) performing constant-current discharging on the battery; 8) performing constant-current charging on the battery until the battery is charged fully after dischargingis ended; and 9) forwarding to the step 7) and circulating for many times, wherein the restore of the battery is completed when the single-circle coulombic efficiency of the battery is larger than orequal to 90%. The performance of the liquid-state metal battery after being restored by the method is not obviously reduced, and the liquid-state metal battery still can continue to normally use. By the method, other restore devices are not needed, restore can be completed only by directly changing a temperature and a working parameter of the battery, the method is simple and practical, and the restore cost is low.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a repair method for a liquid metal battery. Background technique [0002] Liquid metal battery is an emerging battery energy storage technology for grid-level energy storage applications. Because of its low material cost, simple manufacturing process, and easy capacity expansion, it has attracted extensive attention in the field of energy storage technology research and energy investment. . However, although liquid metal batteries have made great progress in the field of monomer and stack technology, there are still many problems to be solved. Among them, the lack of an effective and reasonable battery repair technology is a major bottleneck restricting its development. . [0003] The most common failure mode of liquid metal batteries is short circuit or micro-short circuit during operation. Generally speaking, except for a small number of batteries that are short-circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44
CPCH01M10/4242H01M10/446H01M10/448Y02E60/10
Inventor 张坤蒋凯彭勃郭姣姣王康丽李侠王玉平
Owner CHINA XD ELECTRIC CO LTD
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