On the intelligent manufacture of lithium battery post-processing technology

In recent years, with the rapid development of new energy industry, new energy vehicles power battery Industry grows, The battery Factory is becoming more and more high to the requirement of automation and compatibility.

On December 27-28, by the starting point for research data, sponsored by the starting point of electric network, lithium TV university "2017 apec & new energy cars lithium battery leaders summit starting point and the third international awards "in the crowne plaza Shenzhen longgang pearl river Julong hall.

From automobile enterprise, the core components, spare parts enterprises, etc. 1000 + senior elite gathered, explore the new mode of cooperation, strengthen the depth of the new energy automotive industry chain integration, and promote the healthy development of the industry.

Shenzhen Heng wing can technology co., LTD., vice President of Shao-hua Zhao issued at the meeting period after the "smart lithium battery manufacturing process" the theme of the speech, speech content mainly from the lithium battery after a period of automatic line technology overview, process section detail, three aspects of technological innovation.

The following content according to the speech.

Everybody is good!Today my speech is divided into three aspects, one is for lithium battery after the period of transfer machine technology to do an overview, the second is the detail of process section, finally, the technological innovation.

Overview of lithium battery production after the period of transfer machine body

Lithium battery production mainly include into, OCV test (play ball, spot welding, labeling or hot pressing, gas cutting, trimming, plastic, etc.), quiet place, capacity, step, battery storage, and other processing, processing for by conveyor, hoist, RGV, stacker and other logistics equipment connected, realize fully automatic solutions.

Detailed process section

The first is to process.After the completion of the injection fluid, through a small current charging activation active substances;Carbon negative generated on the surface of solid electrolyte interface (SEI) film;SEI film features can be cycle life, self-discharge, stability, security, etc;The key factors of SEI film materials, into the environment temperature, forming current and voltage accuracy;Into the way of negative pressure into, opening into the, into into normal temperature pressure and high temperature stress.

Secondly about the SEI.liquid Lithium ion batteries For the first time in the process of charging and discharging, electrode materials and electrolyte, forming a layer of covering the passivation layer on the surface of the electrode materials.Passivation layer is a kind of interface layer, has the characteristics of solid electrolyte.

Its role is: first, the electrical insulators is a good conductor, Li + Li + can through the passivation layer embedding and out freely;Second, organic solvent insoluble, prevent solvent molecules were embedded, avoided because of the damage caused by solvent molecules were embedded to the electrode material, greatly improving the cycle performance and service life of the electrode.

Opening into the filler is the feature of open mouth, advantage is simple equipment, low cost, the drawback is easy into the water and impurities.Negative pressure into compared with those of opening into the characteristics of vacuum negative pressure into from the liquid injection mouth!What are the benefits of it?It is fully enclosed environment, gas emissions are very fully;The disadvantage is that equipment is complicated, the cost is higher.Another is according to the temperature of high temperature and room temperature into, high temperature to be 45 degrees in the temperature, complete into 60 degrees and 80 degrees, the purpose is to accelerate the speed, the disadvantage is that the SEI film loose and unstable.Room temperature into is 20 degrees, complete into 25 and 30 degrees, advantage is the SEI film density stable, defect is to turn into a long time.Large current into a side, it is 0.5 C, 1 C, 2 C, advantage is speed up the electrochemical reaction and the SEI film growth rate, shorten to time;The disadvantage is that the SEI film loose, consistency is bad, and unstable.Small current is 0.02 C and 0.05 C, it has the advantage of the SEI film density uniformity and stability, the disadvantage is that into a long time.

Mainly into equipment has a high precision power supply cabinet and automatic needle bed.High precision power cupboard is full of charge and discharge mode, support 5 v, 0-100 - a variety of charging and discharging work step.The characteristics of the automatic needle bed equipment is customized.Suitable for automation of customer demand components should the needle bed equipment, USES the multi-touch technology, make the sample more stable and accurate, greatly saves battery time, improve the utilization rate of equipment.

The third is a metal shell negative pressure into process, is characterized by imported professional pressure solution, good air tightness, long service life, use body positioning precision, independent intellectual property rights and the probe small contact resistance, dual fire solution bringing exhaust drainage system, smoke and temperature monitoring.Another process is soft bag, soft package of battery need servo motor closed-loop control + sensor, pressure maintain performance is very good.

Completed into later, usually there will be a below NG separation process, many manufacturers will use OCV test.

Technology innovation

When it comes to technology innovation, constant wing can recently studied a new technology, and application of a small scale technology.At present, in the constant volume process needs to be more than 1.5 to charge and discharge to complete a full process, and we use half of the charge and discharge cycle data accurate reconstruction of a complete charge and discharge curve, can shorten the time of constant volume more than half.

Heng wing can set up a multiple parameter matching of sorting system, solve the problem of single parameter can't reflect comprehensively the battery quality, greatly increase the consistency of the battery sorting and accurate rate.

At present, the industry's pain points?Is the battery in the explosion in the process of production or thermal runaway.Heng wing can after half a year time to develop an effective thermal runaway early warning and management system, which do a body control in the whole system, from the voltage to the temperature of the track, and the smoke alarm, protection, stacker, etc., to minimize the possibility of accident, the system may be in about two months to push on the market.

Finally, a brief introduction of Heng wing can: Heng wing can be set up in 2006.At present, the constant wing can be square cylinder, soft bag, after a period of automatic production line, and module with PACK automatic production line, welcome everybody to know.

The page contains the contents of the machine translation.