New energy storage system
On April 9, CATL released the latest powerful energy storage system products, which claimed that "technical strength breakthrough, rewrite the energy storage product decay life curve".
The new energy storage system launched by CATL is called "Tianheng". Tianheng energy storage system adopts bionic SEI and self-assembly electrolyte technology to achieve "zero attenuation" of capacity and power for 5 years. This means that the energy storage system will not experience a decline in performance for up to five years, which is a major breakthrough for an energy storage system that needs long-term stable operation.
First, three characteristics
Zero attenuation: The system can maintain zero attenuation of power and capacity for 5 years, which is very important for energy storage systems that need long-term stable operation.
High energy density: Tianheng energy storage system uses L series long-life battery cells of CATL, reaching an energy density of 430Wh/L, and the energy density per unit area has increased by 30%.
Space saving: Taking 200MWh power station as an example, the area of the energy storage equipment area is 4465 square meters, which is 20% less than the 5MWh container energy storage system of the previous generation in the CATL.
The 5-year zero decay of energy storage system capacity is a milestone for long-life lithium batteries, but it is also crucial for energy storage plants that are committed to meeting the needs of new power systems. Tianheng energy storage system adopts bionic SEI and self-assembly electrolyte technology to remove roadblocks for lithium ions, achieve zero power and capacity attenuation in 5 years, and the auxiliary power consumption can be controlled and does not increase during the whole life cycle.
Two, zero attenuation technology
Zero attenuation technology has a high technical threshold and needs to be innovated in two aspects. First of all, by adjusting the material process, such as improving the compaction density of the material, optimize the specific discharge capacity, charge and discharge efficiency, pore ratio, vibration density, particle size, specific surface area and other indicators of the battery material (positive and negative electrodes, diaphragm, electrolyte).
Secondly, more electrochemically active substances need to be used, and breakthrough innovations are made through lithium supplement, pre-lithium, doping coating, etc., which can ensure that the battery preferentially consumes excess active substances during the charge and discharge cycle, so as to ensure that its capacity does not decay.
Tianheng energy storage system adopts more efficient lithium replenishment technology, lithium ion self-healing technology, combined with bionic SEI and self-assembly electrolyte, etc., successfully solved the problem of high activity of lithium metal in "zero attenuation" batteries, effectively contained the thermal runaway phenomenon caused by oxidation reaction, and achieved large-scale production of zero attenuation system for 5 years.
Third, leading technology
In order to ensure the effectiveness of the technology, CATL has built a safety demonstration platform to simulate the safety demonstration of energy storage systems in different power grid scenarios and operating environments. After the project is put into operation, the operation status is continuously monitored through AI risk monitoring and intelligent early warning, and the PSA model is used to quantify the failure probability of the entire life cycle of the energy storage product, so as to verify the safety design objectives and continue to update.
"The cell failure efficiency of Tianheng energy storage system has achieved the industry-leading PPB level, which extends to the operation of the whole life cycle and the whole chain, which can effectively reduce operating costs and bring about a significant improvement in the IRR of the whole life cycle."
In terms of safety, in order to achieve the goal of extreme safety of energy storage, Ningde Times has established a special quality management system for energy storage based on the complete cycle of technology development, testing and verification, operation monitoring, and safety failure analysis. The system sets different security goals based on application scenarios, and then develops corresponding security technologies according to the goals.
Energy storage is a key part of energy reform and power transformation, and the advent of Tianheng energy storage system is another landmark practice to help energy transformation in the CATL.
