Electrification as the first of the new four, the battery is not only the core technology of electrification, but more importantly, there are too many problems that have not been solved. "What did the Premier see when he visited Japan that made his face heavy? Is the gap really that big?" Although talking about the matter of fuel cells, but our lithium-ion battery gap it! Undeniably, in terms of battery integration technology, there is still a small gap. From foreign battery technology quietly cultivated over the years, "the technology of the cell Japan and South Korea dominate, Europe and the United States integration technology is far beyond my over", this statement is not empty. Technology, they use material advantages, vehicle integration advantages and experience, applied to power battery development and application. Of course, there is no denying the great progress of the domestic level. The rapid follow-up and improvement of standards is a typical sign. Our advantages are still very obvious, we can use the market to pull the industrialization (the market is right in front of us); use the policy concentration and unification, deployment of resources. However, how to make good use of the advantages and opportunities to catch up quickly, still need to increase the "innovation" efforts.
How can lithium batteries and integrated technology better adapt and match the progress of the "four"? Today, as China's new "four" automobiles are being proposed and developed, highly integrated features are bound to be the trend of future development. The core technology and parts of electrification, battery and integration technology, how to better adapt and match the progress of the "four", not only need the breakthrough of electric core technology, but also need the integration technology to show its characteristics. As the saying goes, "one tree does not make a forest", and this has been fully evidenced in the development of new energy over the years, which is the battery integration technology that cannot be ignored.
Ryding Electronics believes that electrification as the first of the new four, power lithium battery is not only the core technology of electrification, but there are too many problems have not been solved, compared with foreign batteries and integrated technology is still a small gap. The phrase "cell technology depends on Japan and South Korea, and integration technology depends on Europe and the United States" is not an empty talk.
Technology, with the advantage of materials, vehicle integration advantages and experience, applied to power battery development and application, of course, there is no denying the domestic level of progress, the rapid follow-up and improvement of standards, is a typical sign. Our advantages are still very obvious, we can use the market we have to pull the industrialization; use the policy to focus and unify the deployment of resources. But how to use the advantages and opportunities to catch up quickly, still need to increase the "innovation" efforts.
The "four" trends of power battery
①Intelligence: In the development of electric bicycle, the biggest difference between lithium battery itself and lead-acid battery is the BMS, the battery control, interaction, monitoring of the battery, digitalization is the unique advantage of lithium battery, now lithium battery through the BMS to it for accurate calculation, more accurate and efficient than the original, which is the representative of intelligence.
② lithium: lead-acid battery development is very strong when the development of lithium batteries is relatively slow, mainly due to the immaturity and imperfection of battery technology, we have taken many detours in the development of lithium batteries, just started to do lithium batteries, its failure is very fast, unlike the lead-acid battery failure is relatively smooth, of course, now the technology breakthrough, the second is the lead-acid battery and lithium batteries than the price, because the cost of lithium batteries is bound to Higher than lead-acid batteries.
③Networking: is the lithium battery electric bicycle and manufacturers, stores, user interconnection, including each piece of battery, each electric car, each consumer all data through, this is its core.
④ Digitalization: based on the previous intelligent, networked, accurate analysis of their data, such as who our batteries are sold to, analysis of the user, for example, the first major group is now 2B, their requirements for lithium batteries is a long range, long life, the original lithium battery standard delivery boy, for example, our original lead-acid batteries usually underwrite a year, the charging life of lithium batteries Now can do 800 times, 1000 times, 1500 times, 2000 times, which is another advantage of lithium batteries than lead-acid batteries.
Higher requirements for lithium battery integration technology
1, the safety of lithium batteries: on the one hand, from the internal nature of the core breakthrough, on the other hand, from the "integration" technology to seek a breakthrough. Currently the most applied monitoring technology, power failure technology, fusing technology, thermal isolation technology, it seems to be unable to stop the fire of tesla. Still need to work hard.
2, BMS management technology: many times the accuracy of SOC estimation is not much progress, can not accurately capture the difference between the chemical energy work and resting state, had to leave the head and tail of battery charging and discharging to absorb the capacity deviation margin, so that the battery cost wasted 5 ~ 10%; foreign products in this area to do more detailed. The new "four" promote, BMS is not only the problem of accurate estimation, its management function, diagnostic function, software strategy, hardware architecture and integration, modularization, all need to have innovation and breakthrough. The development of lithium batteries in addition to the technical progress of the core, more intelligent BMS management system is equally important, the rationalization of the battery control, and can be well bolted to the lithium battery with a certain degree of danger, the stability of the BMS management system, reliability is particularly important.
3, lightweight: electric vehicle weight reduced by 10%, corresponding to the range can be increased by 5.5%. There are also traces of lightweighting in the LEAF 2018 model, reducing the weight of the battery housing, reducing the number of screws used to fix the battery module, and removing the excess wall thickness of the bracket, and also reducing the external installation of the battery module. The weight of the battery is always a big problem, to fundamentally solve the problem, energy density by more and more manufacturers concern, when the concept is proposed, the subtle has quietly in the change, cell energy density is no longer in the first place, but before energy density, and also added the word system.
4, integrated standardization process: standardization of lithium batteries is the most effective way to reduce costs, standardization in the early stages of development is required to rely on a certain platform to survive, the domestic status quo even the most basic cell shape, still stuck in diverse forms. Too many shape sizes in the standard is too much to take into account the diverse system needs, which is equal to no standard, the standardization of the battery can strongly promote the development of modularity in battery integration.
Battery integration standardization process
Battery standardization, is the most effective way to reduce costs. This problem, some manufacturers in the country, early to see the problem, and has a standard module products are born. However, the market efficiency is not too good. The reason, standardization in the early stages of development, is the need to rely on a certain platform to survive. The domestic status quo, even the most basic shape of the battery core, still in a diverse form. Although there are domestic standards, but the implementation effect is not ideal. Personally, I believe that too many form factors in the standard, too much to take into account the needs of diverse systems, equal to no standard. On the contrary, VDA single square shell battery size standard, why can get many battery companies recognized? It is worth pondering. The standardization of batteries can strongly promote the development of modularity in battery integration.
Modular "integration" technology innovation development
1. the "new modular" trend of the module, horizontal "versatility" multi-platform applications
The concept of modularity is not a new term, as early as 2012 VW's new platform MMB/MQB/MLB in the powertrain modular multi-brand applications, has been proposed and tasted sweet: reduce the development cycle and risk, significantly reduce the redundancy on the model. In fact, itself reduces the cost increases the reliability and safety of the vehicle.
In terms of battery module design, VW has adopted the same idea: to create a modular platform for battery packs. That is, there is no need to design modules for every model. "Heinz-Jakob Neusser, the Volkswagen Group board member responsible for research and development, told the media: Although battery car models have different specifications, a unified battery cell can be packaged in different numbers and ways to meet all kinds of needs. The group's goal is to reduce battery costs by 66 percent by simplifying battery cell design." This was a few years ago, and we won't dwell on whether this goal has been met, but the modularity idea is the right one.
The new modularity, in addition to the structural perspective to achieve modularity, to achieve cost reduction, increase reliability for the purpose, more importantly, the need to achieve modularity in the functional control. Emphasize the independence and integrity of the function. For example, the realization of the module's terminal collection, charge and discharge management, safety management, and thermal functions in one. In a narrow view, the electronic components of the battery need to have the functions of the battery management module BCU in addition to the collection and equalization functions. The use of interconnection communication, more effective supervision of battery safety.
Modularity not only achieves a high degree of unity in structure and function, but also, when the module becomes the "energy block" concept, it can be completely based on the needs of the vehicle to take the power size. If the new four vehicles, equipped with a flexible, safe, lightweight energy block, the power source will no longer be a bottleneck of concern.
2, the electric core connection technology revolution.
The connection of the battery cells into groups, from the initial bolt connection to the current welding process, the advantages, in terms of stability, consistency, life has been greatly improved, the structure volume has also become smaller, the internal resistance is significantly reduced, so that the power of the battery cells can be released to the maximum. The disadvantage, is that in the lithium-ion battery-specific gradient utilization and recycling applications, causing trouble and increasing costs. The welding process, at the front end of production, requires special equipment and tooling to complete; maintenance, recursive utilization, and terminal disassembly at the back end, are also very inconvenient. At present, in the recursive utilization link, generally disassembling to the module is over. Recursive utilization is not complete. Therefore, although welding is the main process of connecting and forming groups of existing cells, the analysis of the value chain shows that the welding process is only a one-way process, which hinders the reuse of lithium-ion batteries. However, the advantages of welding can reduce the size of Li-ion battery and make more efficient use of space. In summary, a new linkage technology is also imminent.
In recent years, some manufacturers are trying new linking technology. This innovation is worthy of recognition. Combining the cells at will is not only a matter of greatly reducing the cost, but more importantly, it promotes the modularization and standardization process of the modules. It is also in line with the thinking of the new four development. The upgrade of technology never stops, the content of the article only represents the current known situation, innovative technology will change the future, for the time being, for the battery technology, we may also just get started. The future of battery technology must be more applicable in every aspect, so we'll see what happens.
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