
Lithium Battery 3.7V Lithium Polymer Battery 3.2V LifePo4 Battery 1.2V Ni-MH Battery Button Coin Battery

3.7V Battery Pack 7.4V Battery Pack 11.1V Battery Pack 14.8V Battery Pack Other Battery Pack
Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .

Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales

Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc

Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.

Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc

Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.

release time:2024-03-13 Hits: Popular:AG11 battery
Research on SOC of automotive NiMH No.7 battery
In order to estimate the state of charge (SOC) of NiMH No.7 battery, based on the analysis of factors affecting the SOC value and traditional SOC estimation methods, a new idea was adopted based on the actual situation, that is, the working status of the battery is divided into static , recovery, charging and discharging three states, and SOC estimation is performed for the three states respectively. In the estimation process, factors that affect the SOC value are dispersed and eliminated. Especially in the charge and discharge state, the dynamic recovery amount of electricity based on the Coulomb efficiency factor is used to improve the ampere-hour metering method, which solves the problem of the ampere-hour metering method. The problem of cumulative error. Experiments show that this method improves the accuracy of battery SOC calculation and meets the application requirements of power vehicles.
Lithium batteries have been widely used in industry, daily life and other fields, and the estimation of battery state of charge (SOC) has become an important part of battery management. However, due to the complex structure of the battery, the state of charge of the battery is affected by factors such as discharge current, battery internal temperature, self-discharge, aging, etc., making it difficult to estimate SOC. Current SOC estimation methods include: open circuit voltage method, ampere-hour measurement method, internal resistance method, neural network and Kalman filter method. Foreign V.Pop and others proposed the EMF-SOC model, which is a model of the relationship between battery electromotive force and state of charge to estimate SOC, which is equivalent to the open circuit voltage method. This method is used to estimate the battery after it has been left standing for a long enough time, and cannot be estimated in real time; Some people also use the ampere-hour measurement method or the Kalman filter method to estimate SOC. The ampere-hour measurement method leads to inaccurate estimation due to large current fluctuations or long-term accumulation of measurement errors; the Kalman filter method has many problems in establishing an accurate and practical battery dynamic model. Therefore, this article adopts a new idea to estimate SOC based on the actual situation of lithium batteries in application, that is, dividing the working status of the battery into three states, and estimating the SOC of each state one by one. During the estimation process The factors that affect SOC are eliminated, and the SOC values in the three states are mutually premised, thereby improving the estimation accuracy of SOC.
1. Battery working status and SOC estimation
The battery status can be divided into three states according to the actual situation, which are defined here as static, recovery, and charge and discharge. Their relationship is shown in Figure 1.
1.1 Stationary state
The static state of the battery refers to the state in which the battery has completely recovered after the battery stops working. It is converted from the recovery state and can be directly transferred to the charge and discharge state. The calculation amount of SOC in this state is used as the initial value of SOC estimation in the charge and discharge state. Since this state is characterized by zero current and no polarization, its SOC value has a good correspondence with the open circuit voltage. Therefore, the open circuit voltage method can be used to directly estimate the SOC value of the battery. The relationship between the open circuit voltage of the battery and the SOC value The curve is shown in Figure 2.
The relationship between the battery's open circuit voltage and SOC value
In the static state, the battery capacity is mainly affected by the self-discharge phenomenon, which causes the battery power to decrease with time. Using the corresponding relationship between the open circuit voltage and the SOC value to estimate the SOC can eliminate the power loss caused by self-discharge. influence, so that the SOC value can more accurately reflect the state of the battery.
1.2 Restoration status
The recovery state refers to the transition stage of the battery from a discharged or charged state to a resting state. Generally, the time spent in this stage is 8 hours (this value is an empirical value). The calculation amount of SOC in this state is used as the initial value of SOC estimation in the charging and discharging state. The SOC estimation at this time mainly considers the change of battery power after discharge or charging. quantity. After entering the recovery state from the discharge or charging state, the battery power will increase with time. The reason for the change is that the polarization phenomenon occurs inside the battery during the discharging or charging process, and part of the power is not used for actual charging and discharging. Slowly accumulating, when the battery stops working, the polarization phenomenon will slowly disappear and the accumulated power will be restored.
Read recommendations:
Nickel -hydride batteries have the following characteristics.home solar energy storage lithium batte
The disadvantages of using LCD batteries in UPS UPS.energy storage battery for solar system Processi
Last article:Nickel Hydride No. 5 battery
Next article:R6 Carbon battery
Popular recommendation
battery pack lifepo4
2023-05-09Ni-MH battery pack direct sales
2023-03-223.7v 18650 lithium battery
2023-03-2218650 3500mah battery
2023-03-22AA NiMH battery maker
2023-03-22Coin Battery LR 726
2022-10-15502030 200MAH 3.7V
2023-06-125/AA USB 1.5V 2035mWh
2023-06-29Lithium-ion battery GN200 222wh
2022-08-23Bluetooth headset
2022-09-22505060 2000MAH 7.4V
2023-06-10402427 260MAH 3.7V
2023-06-12Coin Cell BR 2032
2022-10-15Bluetooth headset
2022-09-22Cabinet type energy storage battery 25KWH
2022-11-083.7v battery 18650
2023-06-25home solar energy storage lithium battery
2023-06-251.2V NiMH battery
2023-06-2518650 battery pack direct sales
2023-06-252025 button cell battery
2023-06-25Applications of Lithium - Ion Batteries in Electric Vehicles
2025-03-25How to choose a high -quality lithium battery?
2023-03-06Do you know all these terms in the battery industry
2024-08-2218650 battery 3.7v 6000mah.Lithium battery waterproof grade
2023-10-11Technical requirements for batteries
2024-05-10The European patent of Limpo4 lithium batteries was revoked by the judgment.cr2032 3v lithium batter
2023-07-19Lithium battery overcurrent protection.household energy storage battery
2023-03-25Introduction to semi -solid lithium batteries.household energy storage lithium battery company
2023-04-14AG1 battery.What is the process for customizing 18650 lithium-ion battery packs?
2023-10-13High -mortivity battery in the car mold.lifepo14 battery for solar energy storage wholesaler
2023-04-22
360° FACTORY VR TOUR