Although both power batteries and energy storage lithium batteries are lithium batteries, their properties are completely different. We believe that everyone will have a deep understanding of the difference between power batteries and energy storage batteries after reading the breakdown below. When we use batteries, we can choose according to our needs.
1. The difference between the capacity of power battery and energy storage battery
In the case of all new batteries, the battery capacity is tested by a discharge meter. Generally, the capacity of power lithium battery is about 1000-1500mAh; the capacity of energy storage lithium battery pack is above 2000mAh, and some can reach 3400mAh.
2. Different application industries of power batteries and energy storage batteries
Power lithium battery is used as the driving power battery for electric vehicles, electric bicycles, electric motorcycles, electric equipment and tools; used in power transmission substations to provide closing current for power devices; energy storage battery packs are mainly used for hydropower, thermal power, wind power, solar power station and other energy storage power supply, peak and frequency modulation power supply auxiliary services, digital products, power products, medical security, UPS power supply, etc.
3. Power battery and energy storage battery management system BMS have different positions
In the energy storage system, the energy storage lithium battery only interacts with the energy storage converter at high voltage, and the converter takes electricity from the AC grid to charge the battery pack; or the battery pack supplies power to the converter, and the electrical energy is supplied by the converter. It is converted into alternating current and sent to the alternating current grid; the BMS of the electric vehicle has an energy exchange relationship with the motor and the charger under high voltage. In terms of communication, there is information interaction with the charger during the charging process, and the most detailed information interaction with the vehicle controller in the entire application process.
4. The performance and design of power batteries and energy storage batteries are different
Power lithium batteries pay more attention to charging and discharging power. It requires fast charging speed, high output power and impact resistance, with special emphasis on high safety and high energy density to achieve long-lasting battery life, as well as lightweight requirements in weight and volume; The preparation of energy storage batteries emphasizes battery capacity, especially requires operation stability and service life, and more considers the consistency of battery modules. In terms of battery materials, attention should be paid to expansion rate, energy density, and uniformity of electrode material performance. In order to pursue the long life and low cost of the entire energy storage device.
Power lithium batteries with different properties refer to batteries that provide power for transportation vehicles, generally compared with small batteries that provide energy for portable electronic devices; ordinary energy storage lithium batteries are a kind of lithium metal or lithium alloy as the positive electrode material. Primary batteries with aqueous electrolyte, different from rechargeable lithium-ion batteries and lithium-ion polymer batteries.