China‘s fast growing electrical vehicles leads to sharply rising used batteries, whose graded utilization needs to be industrialized, but its path and results are directly influenced by different technical directions. This paper, aiming at choosing appropriate investing direction and making matching policies, analyzes the key factors of industrial development from perspective of system based on practices, summarizes scales, costs, gains and profits under different technical directions by taking grid energy storage a scenario, and establishes a systematic dynamics model that is simulated for comparison. Two major technical directions, “decomposing-reconstructing” and “whole package utilization”, have their own pros and cons; however, “decomposing-reconstructing” direction prevails in expansion speed with no constraints of brands. Thanks to scale effect, “decomposing-reconstructing” direction beats the “whole package utilization” at the initial stage, but the latter will be gradually overcoming in a long term. Facilities cost and batter cost are the key factors, the former is falling while the latter is rising, facilities cost proportion has a faster/fluctuated falling compared to the “whole package utilization”, whose growing speed and gains will be largely improved if issues among different brands can be resolved and different EV makers can be united. This paper presents suggestions on selecting technical directions in accordance with national strategies, providing initial funds, offering matching allowance policies, promoting upper-to down-steam cooperation and implementing limited information sharing among different brands. 

This paper uses statistical and double wells power methods to estimate their geothermal resource of ten geothermal fields in Beijing and re-estimate their geothermal potential. The heatinfluencing range of double pumping-filling wells is 360k square meters at their space of 300m, which can hold 2.28 double pumping-filling units per square kilometer. The available heating potential will be 275 million square meters by statistical method, in Beijing’s ten geothermal fields under above conditions, and 301 million square meters by double wells power method. It could be up to 860 million square meters if geothermal graded using combined with other clean energy aids. Heating supply by using double wells system can increase well distribution density, helpful to promote the development of geothermal heating in Beijing, and in China.