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| Compare energy storage battery and power battery in all aspects! Can scene excha |
| Release time:2023-03-11 10:22:34| Viewed： |
In recent years, China's new energy sector has erupted in an all-round way, not only in the field of photovoltaic energy storage, but also in the field of new energy vehicles. In 2022, the production and sales of new energy vehicles will reach 7.058 million and 6.887 million respectively, and the market share of new energy vehicles will reach 25.6%. It is estimated that the sales volume of new energy vehicles in China will exceed 9 million in 2023. In 2022, the shipment volume of lithium battery for energy storage in China will reach 135GWh, with a year-on-year increase of about 172%.
Having said this, some people can't help asking whether the lithium battery used in the energy storage power station can be used in new energy vehicles. On the contrary, can the electric vehicle battery be used as the energy storage battery? Today, the small box will come to share with you a plate of energy storage batteries and power batteries to see if they can be replaced.
The complete energy storage battery system is mainly composed of battery pack, battery management system (BMS), energy management system (EMS), energy storage converter (PCS) and other electrical equipment. The battery pack is the main component of the energy storage system; The battery management system is mainly responsible for battery monitoring, evaluation, protection and balance; The energy management system is responsible for data acquisition, network monitoring and energy scheduling; The energy storage converter can control the charging and discharging process of the energy storage battery pack and carry out AC/DC conversion.
distinguish
In the cost composition of energy storage system, battery is the most important component of energy storage system, accounting for 60% of the cost; The second is energy storage inverter, accounting for 20%, EMS (energy management system) cost accounting for 10%, BMS (battery management system) cost accounting for 5%, and others accounting for 5%.
The cost of power battery system is composed of comprehensive costs such as battery core, structural parts, BMS, box, auxiliary materials, manufacturing costs, etc. Battery cells account for about 80% of the cost, while pack (including structural parts, BMS, box, accessories, manufacturing costs, etc.) accounts for about 20% of the cost of the entire battery pack.
BMS (battery management system), as the core component of the battery system, determines whether the components and functions of the battery pack can be coordinated, and directly relates to whether the battery pack can provide power output for electric vehicles safely and reliably.
The energy storage battery management system is similar to the power battery management system, but the power battery system is in a high-speed electric vehicle. It has higher requirements for the power response speed and power characteristics of the battery, the accuracy of SOC estimation, and the number of state parameter calculations. The relevant adjustment functions also need to be realized through BMS.
Lithium-ion batteries can be classified into consumption, power and energy storage batteries according to their application fields.
Application Scenario Differences
From the perspective of application scenarios, lithium energy storage battery is mainly used in the pool for power peak regulation, off-grid photovoltaic energy storage or peak-valley price difference energy storage scenarios on the user side. Generally, it needs to be continuously charged or discharged for more than two hours, so it is suitable to use capacity-type battery with charge-discharge ratio ≤ 0.5C.
If the energy storage power station is charged and discharged at the frequency of once a day, the cycle life of the energy storage lithium battery is generally required to be more than 3500 times. If the charging and discharging frequency is increased, the cycle life is generally required to be more than 5000 times.
Since the energy storage power station has been renovated only once in more than ten years, there is no requirement for portability, but the requirement for battery life is very high. Therefore, lithium batteries used as energy storage power stations are relatively bulky, but their service life is very long.
Although the power battery is a kind of energy storage battery, it is mainly used in electric vehicles. Due to the volume and weight limitations of electric vehicles and the requirements of starting acceleration, the power battery has higher performance requirements than the general energy storage battery. For example, the energy density should be as high as possible, the charging speed of the battery should be faster, and the discharge power should be greater, so as to achieve a more durable endurance.
Taking the electric vehicle as an example, the theoretical life of the lithium iron phosphate battery pack is 1200 times. According to the use frequency, the lithium iron phosphate battery pack is fully charged and discharged once every three days, 120 times a year, and the calendar life of the lithium iron phosphate battery pack is 10 years.
Cost variance
Although the energy storage battery and power battery use the same type of battery material - both lithium batteries, the energy storage battery is generally cheaper than power battery in terms of overall price because of its poor quality and high internal resistance.
In terms of technical competition, the power battery also faces the competition with the traditional fuel power source, while the energy storage battery needs to face the cost competition of the traditional peak-shaving frequency modulation technology. The traditional peak-shaving technology can even use the entire reservoir as a battery, with extremely huge capacity.
In addition, the scale of energy storage power stations is basically more than megawatts or even 100 megawatts, so the cost of energy storage lithium batteries is lower than that of power lithium batteries, and the safety is also higher.
last
After that, let's look at the question raised at the beginning. Can the energy storage battery be used for electric vehicles, and can the power battery be used for energy storage?
If the energy storage battery is to be used in electric vehicles, it is necessary to first confirm whether the battery type and capacity are consistent, and then check whether the stable discharge current supported by the energy storage battery can meet the requirements of the electric vehicle lithium battery when driving, and whether the maximum allowable current meets the requirements of the electric vehicle for short time use. If these conditions are met, it is also necessary to adjust the electric control system of the electric vehicle when replacing the battery.
Of course, this is only in theory. The actual conventional battery power cannot meet the starting requirements of electric vehicles. If it is installed on electric vehicles, it will not only be unable to go on the road, but also affect the service life of batteries to a certain extent. Secondly, the power battery is used for energy storage.
After the control system corresponding to the discharge size of lithium battery is designed and configured, the power battery can be used as an energy storage battery. After all, the cost of battery and power control system is high, so it may not be ideal in terms of economic benefits.
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