Dynamic lithium battery ladder use technology: difficult point and solution

　　Author ：Iflowpower – Portable Power Station Supplier

From a technical point of view, the core requirements of the ladder utilization technology are the quality and safety of the target product. Specifically, the first is the quality safety control of the incoming material, and the other is the production process control of the target product, and the control and design of the target product. How to control the quality and safety of retired batteries? I think, first build a big data traceability system platform.

The platform includes three sets of systems, which are battery-core development and production data systems, battery pack research and development production data systems, battery packs car operation monitoring data systems. The three sets of systems are systematically analyzed by retired batteries, and the data can be entered into the market, and the data includes design information, performance data security, incoming detection, etc. The battery core R & D production data system includes preliminary detection data and deep process control data.

In terms of initial detection data, each cell has a unique code, and the initial design information and production information can be found through code. The module information includes all of the ladder lists, from which you can find out what parameters in the assembly process. At the same time, the battery pack car operation monitoring data system is also critical, monitoring the data and operating status of the battery pack in the actual use process.

These data, in addition to helping batteries do not monitor the warning of the warning, it is very meaningful to the company's ladder. In addition to establishing a three sets of systems, there is also a test technical requirement. Ningde Times conduct health index evaluation for retired battery packs, including battery-core assessment, battery packing performance detection, reliability detection of battery packs, battery pack / module appearance detection.

Under normal circumstances, the performance assessment of the battery is divided into life evaluation, safety assessment and reliability assessment, including the reliability of battery packs, reliability of battery pack connector, and management system hardware. Battery Package Performance Detection can eliminate safety hazards. In addition, the change in DC internal resistance, changes in voltage differences, and changes in the shape of the battery pack, etc.

, all in the evaluation content of the health index. Among them, from the shape of the battery pack, it will inevitably occur in the car accident, such as a car accident, and there will be a variation of a series of external components, so the formation of battery packs should also be assessed. For new testing technology, it is important to exclude safety hazards.

From the battery point of view, what state is the most dangerous battery, how to detect whether the deposition of lithium dendrite occurs without turning on the battery? Ningde era has developed a test technology, by determining whether it has a deposition of lithium delegated crystals by negative reactions of the battery. If the battery pack is retired, the company cannot judge whether the battery has undergone a harsh environment, or in a charging situation has exceeded a canned range, there is a possibility to leave the safety hazard to the next stage. Therefore, this testing technology must first ensure that safety hazards will not remain in the next stage.

It is worth noting that including plastic parts, positive and negative protective covers, modules, wire harness isolation plates, insulating films, etc. If these components do not evaluate, they have experienced environmental impact, car vibration, etc., will bring unpredictable results.

Therefore, when screening the ladder, the company should be careful. At present, the amount of lithium iron phosphate ion battery is large in the market, and the battery leads to the battery is also a lithium iron ion battery. The Ningde era has been experimenting at a temperature of 25 ¡ã C, 45 ¡ã C, 60 ¡ã C, and tests the battery life.

After experimental testing, at normal temperature, the battery is used to 80%, and the frequency is 2,800 to 3,000 times. Maximum can reach 5000 ~ 6000 times; the temperature is at 45 ¡ã C, in general, the battery is at 45 ¡ã C, The conditions for recycling the recycling requirements are 1,500; 60 ¡ã C high temperatures can also be used again to reach 1000 times. According to these three types of working conditions, the current battery can use for at least five years after retiring from the car.

From this point of view, the battery of the Ningde Times has competitive advantage in consistency and service life. my country is in the starting stage of battery ladder, technical difficulties are also restructuring technology, life prediction and discrete integration technology. Life prediction is the key point of the entire ladder to use the product technology.

If you don't master the service life of the product, how do you supply quality assurance for our customers? Therefore, from the perspective of the battery company, overcome the life prediction technology is the top priority of the ladder utilization project. Of course, life prediction technology is difficult, because many key technologies are concentrated, such as attenuation mechanism, testing, consumption, etc. There is also a difficult point.

Under different situations, under different areas, the battery consumption is not the same, a batch of batteries retired at the same time will have different attenuation rates, and the uneven battery will be re-distributed Applying in a product, this is a difficult point in the entire industry. The key point of discrete integration technology is how to make the system more effectively applied the remaining energy in the management system. At present, the industry is concentrated on this difficult point, focusing on how different discrete is how to run efficiently in a system.

For now, research institutions first solve the technical level, the company should consider practical applications, so it is recommended to produce. In this way, the research results of colleges and universities can be converted into actual application technology. From the essence of discrete integration technology, the key to the DC internal resistance of the decommissioned battery, so how to control the change in DC resistance, and can effectively reduce the cost of discrete integration.

From the whole company, it is currently trying some demonstration projects. In terms of battery material recycling, Ningde Times cooperates with companies with materials recovery. From the operational process, it is important to include battery pack classification, disassembly and material recycling.

At present, the dismantling environment, transportation conditions, and the company are developing standards for materials recycling, and the standards for materials recovery and packaging and transportation can be launched this year. Specifically, the battery dismantling is by breaking into electrode powder, and then the associated metal is recovered; the material recovery is important by electrode powder, passing through a acid base, extract, then becoming a ternary material, and finally presented product is nickel sulfate. , Manganese sulfate, cobalt sulfate, etc.

In this regard, ensuring that the recycling process is also an important standard for the measurement of the ladder, so the process monitoring is very important. Based on this, the country has corresponding requirements for the venue, dismantling the environment, dismantling equipment, and dismantling. The company also involves the production of equipment, personnel qualification, dismantling environment, oil and water separation during the development of standards.

All in all, material recovery is to achieve high recovery while ensuring environmental protection. Finally, the battery material recovery is through "physical + chemistry" method, the vehicle company does not have to consider the problem of backend processing. I think that the company's temporary battery is not a long-lasting solution.

After the ladder is mature, including the battery failure, some companies have explored the corresponding, profitable business model. At present, Ningde Times has jointly formed a circular economy of a complete green manufacturing industry with Bangup .