With the rapid development of economy and the continuous improvement of living standards, human demand for energy continuously expanding. The traditional energy brings to the society is a two problems: the energy crisis, the traditional energy decrease as the environmental pollution, 2 it is traditional energy - the damage of environmental increasingly whole world is focused on renewable energy, hope renewable energy can change the energy structure, maintain human long-term and sustainable development. Solar energy with its unique advantages and become the focus of attention. Plenty of solar radiation is an important energy, solar radiation is the inexhaustible renewable energy, which is a kind of green clean energy, no pollution, no region of human freedom, can use energy. In the effective use of solar energy utilization, sun arises to photoelectric in recent years, the fastest development is the most vigorous area of topic is a use of photovoltaic cells as power and control circuit of the charger. Solar battery control circuit design is the light into electrical energy directly, and the thought of secondary battery charging control for the purpose of constant flow. This design, use BQ2057C chip as lithium battery control chip, when there is enough sun radiate light, solar battery control circuit system can be filled with solar battery, lithium batteries for the rechargeable battery monitoring system and the protection circuit design to avoid being rechargeable batteries charging depth caused by their permanent damage.