HEATING CONTROL METHOD FOR ENERGY STORAGE, ENERGY STORAGE SYSTEM, AND PHOTOVOLTAIC ENERGY STORAGE SYSTEM

• Main Authors: CHEN, Aitang, WANG, Gang
• Format: Patent
• Language: English; French; German
• Published: 26.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY

The present invention relates to a heating control method for energy storage, an energy storage system, and an photovoltaic energy storage system. The energy storage system includes a controller and a plurality of battery packs connected in parallel. The battery pack includes a cell pack, a temperature sensing module, a temperature control module, and a BMS. The temperature sensing module is configured to detect a temperature of the battery pack, the temperature control module is configured to heat the battery pack, and the BMS is configured to send heating requests and SOCs of corresponding battery packs to the controller. The controller determines, based on a difference between a voltage of a direct-current bus and a charging voltage reference value of the energy storage system, a quantity of battery packs whose temperature control modules can be enabled, and determines, based on the SOCs of the battery packs, priorities for enabling the temperature control modules of the battery packs. In the present invention, power-generation power of a photovoltaic array is fully utilized. This not only avoids a waste of photovoltaic power-generation power at a low temperature, but also avoids heating the battery packs by using energy of the energy storage system, without affecting normal power scheduling of the photovoltaic array.