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Safe discharging method for waste lithium ion battery

A lithium-ion battery, battery voltage technology, applied in the direction of secondary battery charging/discharging, secondary battery, battery recycling, etc., can solve the problems of unguaranteed discharge efficiency, potential safety hazards, incomplete discharge, etc., to achieve low cost, Improve efficiency and safety, high-efficiency discharge effect

Active Publication Date: 2021-07-23
SHENZHEN QINGYAN EQUIP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductive powder discharge technology also has the problems of small discharge current, slow discharge speed and unguaranteed discharge efficiency.
Chinese patent documents CN210956909U and CN106207297B adopt resistive loads to discharge, but it is easy to have problems such as excessive temperature in the discharge process, potential safety hazards and incomplete discharge.

Method used

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  • Safe discharging method for waste lithium ion battery
  • Safe discharging method for waste lithium ion battery
  • Safe discharging method for waste lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] S1 Treat a waste square aluminum shell ternary lithium-ion battery with an open circuit voltage of 3.78V in a liquid nitrogen freezing environment at -30°C for 10 minutes;

[0040] S2 Connect the frozen waste square aluminum shell ternary lithium-ion battery to a 1Ω resistance load discharge circuit, then connect the battery to a battery voltage detector to form a discharge device, and paste it on the surface of the waste square aluminum shell ternary lithium-ion battery shell The upper thermocouple is used to verify the change trend of the surface temperature of the waste square aluminum shell ternary lithium-ion battery;

[0041] S3 Immediately put the discharge device into the low-temperature box, connect it to the temperature controller, and connect the battery voltage detector, temperature controller and thermocouple to the main controller, set the temperature of the low-temperature box to 0°C, and after discharging for 6 hours, the battery voltage detection The de...

Embodiment 2

[0046] S1 Treat 4 waste lithium manganese oxide 18650 steel case lithium-ion batteries with an open circuit voltage of 3.65V in a liquid nitrogen cooling environment at -20°C for 15 minutes;

[0047] S2 Connect the frozen battery to a graphite powder discharge frame with a resistance of 5Ω, and then connect the battery to a battery voltage detector to form a discharge device;

[0048] S3 Put the discharge device into the low temperature box immediately, connect it to the temperature controller, and connect the battery voltage detector and the temperature controller to the main controller, set the temperature of the low temperature box to -5°C, and after discharging for 3 hours, the battery voltage detector detects When the battery voltage drops below 3.5V, adjust the temperature of the incubator to 30°C and continue discharging.

[0049] S4 After continuing to discharge for 2 hours, the battery voltage detector detects that the battery voltage drops below 1.0V, the discharge i...

Embodiment 3

[0051] S1 Process a waste lithium iron phosphate soft-packed lithium-ion battery with an open circuit voltage of 3.42V in a liquid nitrogen cooling environment at -10°C for 30 minutes;

[0052] S2 Connect the frozen battery to a resistance discharge circuit with a resistance of 3Ω, and then connect the battery to a battery voltage detector to form a discharge device;

[0053] S3 Put the discharge device into the low temperature box immediately, connect the battery voltage detector and thermocouple to the main controller, set the temperature of the low temperature box to 0°C, and after 4 hours of discharge, it is detected that the battery voltage drops below 3.2V, and the temperature of the low temperature box is adjusted to 35°C, continue to discharge.

[0054] S4 After continuing to discharge for 2 hours, the battery voltage detector detects that the battery voltage drops below 1.0V, the discharge is completed, and the battery is taken out.

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Abstract

The invention provides a safe discharging method for a waste lithium ion battery, which comprises the following steps of: freezing a waste lithium ion battery to temporarily inactivate the battery; connecting the frozen battery to a solid load discharging loop to form a discharging device; putting the discharging device into a low-temperature box, carrying out real-time voltage detection on the waste lithium ion battery to be discharged, adjusting the temperature of the low-temperature box according to the detected voltage value, controlling the discharging rate of the battery, and starting discharging; and when the voltage of the battery drops below a set value, stopping discharging, taking the battery out, and entering a subsequent procedure. The waste lithium ion battery connected with the discharging loop is put into the low-temperature box, the temperature during discharge is adjusted in a segmented manner according to the voltage monitored in real time, the discharge rate at the initial stage of discharge can be reduced, the safety during discharge is ensured, the discharge degree is judged through a battery voltage detection controller, the discharge rate at the later stage of discharge is improved, and safe and efficient discharging of the waste lithium ion battery is realized.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium ion batteries, in particular to a method for safely discharging waste lithium ion batteries. Background technique [0002] With the advancement of new energy product technology, especially the demand for lithium-ion batteries in the electronic market and electric vehicle market is increasing year by year. As of the end of 2017, my country has promoted more than 1.8 million new energy vehicles and assembled about 86.9GWh of power batteries. Since 2018, lithium-ion batteries will gradually enter a large-scale decommissioning period, and the problem of lithium-ion battery disposal is imminent. [0003] At present, the lithium-ion battery recycling method is mainly to carry out physical crushing and sorting first, and then carry out wet recovery of valuable metal elements. When waste lithium-ion batteries are mechanically and physically crushed, because some batteries contain residual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/54
CPCH01M10/44H01M10/448H01M10/54Y02W30/84Y02E60/10
Inventor 叶利强田勇傅婷婷陈建军符冬菊张维丽闵杰
Owner SHENZHEN QINGYAN EQUIP TECH CO LTD
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