Power battery is the source of electric vehicle, which directly affects the performance and use cost. Through patent retrieval and patent analysis conclusion is palpable: China's power battery technology has been growing maturity gradually in recent ten years; framework of power battery patent layout has taken shape, namely, stress has been put on the fundamental battery technology and battery-based applications is getting some attention; automobile firms, battery manufacturers, foreign-funded new-energy companies and universities are main competitors in power battery field. To break bottle-neck technology it takes not only the nation to establish industrial planning but to select appropriate technical route and strengthen cooperation between the competitors.