How to distinguish between energy storage lithium battery an
Writer： admin Time：2022-09-06 21:18 Browse：℃
How to distinguish between energy storage lithium battery and power lithium battery, engineer professional answer
What is the difference between energy storage lithium battery and power lithium battery? How to choose these two lithium-ion batteries according to the actual application? This article will make a detailed comparison and explanation through the definition, scope of use, management system, type of battery and other aspects of the two, so as to help you better distinguish, choose and use.
1) Definition of energy storage lithium battery and power lithium battery
Energy storage lithium battery: It is a power supply with lithium battery as energy storage. It is a secondary lithium battery that uses carbon material as negative electrode, lithium-containing compound as positive electrode, and uses non-aqueous electrolyte solution. Lithium iron phosphate is common. Battery.
Power lithium battery: Power lithium battery refers to the battery that provides power for transportation. Generally, compared with the small battery that provides energy for portable electronic devices, it is basically used in electric vehicles, electric trains, electric bicycles, and golf carts. Powered battery.
2) Difference between the two
The definition of power battery and energy storage battery is relatively broad, which category do you refer to in terms of application. The energy storage battery generally has a small current and belongs to the energy type, and the power battery generally needs to be able to discharge at 3C. The discharge capacity or discharge curve and plateau can be compared by 3C discharge or 1.5C discharge. The price is expected to be 1.2 times that of the latter for the same specifications.
The internal resistance of the battery is different
The internal resistance of the battery of the same capacity is smaller than that of the energy storage battery
The total amount of batteries varies
For batteries of the same capacity, the weight of the power battery will be heavier than that of the energy storage battery (the design process is different)
The price of the power battery will be more than 1.5 times that of the energy storage (according to the different requirements of customers)
Different scope of use
Lithium-ion batteries for energy storage are used in low-current devices (usually 0.5-1C discharge range)
Such as power storage power station, mobile communication power supply, new energy storage power supply, aerospace and military power supply, solar power generation equipment and wind power generation equipment.
Power lithium batteries are generally used in equipment that requires high current discharge (3C-5C)
The automobile and motorcycle industries mainly provide electrical energy for the starting ignition of the engine and the use of on-board electronic equipment;
Industrial power system, used for power transmission and substations, providing closing current for power units, providing backup power for public facilities and power for communication;
In the electric vehicle and electric bicycle industry, instead of gasoline and diesel, there are mainly new energy vehicles, which are used as driving power sources for electric vehicles or electric bicycles.
The hardware logic structure of the energy storage management system is different
Energy storage lithium battery energy storage management system: The scale of the energy storage system is very large, and the hardware generally adopts a two-layer or three-layer model, and the larger scale tends to be a three-layer management system.
Power lithium battery energy storage management system: The power battery system is in a high-speed electric vehicle, and has higher requirements for the battery's power response speed and power characteristics, SOC estimation accuracy, and the number of state parameter calculations. There is only one layer of centralized or two layers of distributed, and basically there will be no three-layer situation. Small cars mainly use a one-layer centralized battery management system, and currently there are few two-layer distributed power battery management systems.
Different types of lithium batteries are used
Lithium iron phosphate batteries are mainly used in energy storage lithium batteries, because lithium iron phosphate batteries are better than other batteries in terms of safety, environmental protection, volume, and weight. Lead-acid batteries and lead-carbon batteries are also used in some energy storage power stations.
The current mainstream battery types for power lithium battery electric vehicles are lithium iron phosphate batteries and ternary lithium batteries, which have many options and are not very stable in terms of safety.
Different volume requirements
The energy storage lithium battery is mainly used to provide power, and it is required to be able to output high power. Lithium battery packs are small in size and light in weight. The energy density of lithium batteries is 3 to 4 times that of lead-acid batteries, 2.5 times that of nickel-cadmium batteries, and 1.8 times that of nickel-metal hydride batteries.
Power lithium batteries are mainly used for energy storage, with large capacity requirements, long life requirements, and low self-discharge. Power tool batteries do not have a large capacity and do not need to provide high power output.
Different current usage ranges
Power lithium batteries are generally used in equipment that requires high current discharge (3 ~ 5C), and the damage to the battery is relatively small. Energy storage lithium batteries are used in small current devices (usually 0.5 ~ 1C discharge range), where C refers to the charge and discharge rate, and the charge and discharge rate is a measure of the speed of discharge. Generally, the capacity of the battery can be detected by different discharge currents. For example, when a battery with a battery capacity of 100Ah is discharged with 15A, its discharge rate is 0.15C.