Announcing the release of the New Generation Active BMS Series – ENJBMS series BMS, an improved version of the JK series active BMS. The ENJBMS series BMS comes with the following optimizations: Contact online >>
Announcing the release of the New Generation Active BMS Series – ENJBMS series BMS, an improved version of the JK series active BMS. The ENJBMS series BMS comes with the following optimizations:
To purchase this BMS series, our factory is currently seeking foreign sales agents with BMS technical knowledge to assist in direct international distribution. Sales Model: To deliver high-end service and long-term technical support to premium clients, this series will be sold through a factory direct-sales model, not currently available through domestic third-party trade companies. International customers can contact our factory directly (E&J Technology Group Co., LTD – / ) for inquiries and purchasing.
JK BMS held a professional BMS engineer team have more than 10 years experience in the electronics/battery BMS field, strength to design and produce the most innovative and high quality active battery balancer and active balancer BMS for li-ion,lifepo4, NMC, Ni-MH,Ni-Cd, Lead-acid batteries, red-flow batteries, VRLA and AGM batteries,etc..
Manufacturing plant(China)
Beiyi industrial park, Longhu,
Shantou, Guangdong, China.
BCI Group 24 | Self-heating | Bluetooth App
2 Wheels E-Scooter Battery
2 Wheels Electric Scooter Battery
5kWh~36kWh | High Quality | Europe CE Certification
Highly popular in Asia and Eastern Europe.CE Certification | Home-ESS
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Understanding Passive BalancingPassive balancing is a straightforward method where excess energy from higher-voltage cells is dissipated as heat through resistors. This method equalizes the charge among cells by discharging the more charged cells until they match the voltage of the less charged ones.
Understanding Active BalancingActive balancing involves transferring energy between cells rather than dissipating it as heat. This method uses additional circuitry to move charge from higher-voltage cells to lower-voltage ones, maintaining a more uniform state of charge across the pack.
Benefits of Passive Balancing
Benefits of Active Balancing
Importance of Cell BalancingCell balancing is crucial for maximizing battery performance and lifespan. Imbalances can lead to overcharging or over-discharging of individual cells, resulting in reduced capacity, increased wear, and potential safety hazards like thermal runaway.
Choosing the Right MethodThe choice between active and passive balancing depends on several factors:
What is the main difference between active and passive balancing?Active balancing redistributes energy between cells, while passive balancing dissipates excess energy as heat.When should I use active balancing?Active balancing is ideal for larger battery systems or applications where efficiency and longevity are critical.Is passive balancing sufficient for all applications?While passive balancing works well for smaller or less demanding applications, it may not be adequate for high-performance scenarios.
Recent advancements in battery management technologies have highlighted the importance of efficient cell balancing methods. Companies are increasingly adopting active balancing solutions to enhance the performance and lifespan of lithium-ion batteries used in electric vehicles and renewable energy storage systems. Innovations in semiconductor technology are also making active balancing more cost-effective, paving the way for broader adoption across various industries.
“Understanding the differences between active and passive cell balancing is vital for optimizing battery performance. As technology evolves, we see a shift towards more efficient solutions that not only enhance safety but also extend the life of battery systems. The future lies in smart battery management that adapts to user needs while maximizing efficiency.”
Lithium-ion (Li-ion) batteries play a crucial role in various applications, including energy storage and electric vehicles. However, they are prone to cell voltage imbalance over time, which can significantly reduce battery capacity and overall performance. To address this issue and improve the lifetime of battery packs, cell balancing methods have been developed. These methods can be broadly categorized into four types: passive cell balancing, active cell balancing using capacitors, Lossless Balancing, and Redox Shuttle. Each Cell Balancing Technique approaches cell voltage and state of charge (SOC) equalization differently. Dig into the types of Battery balancing methods and learn their comparison!
Likewise, the active cell balancing transfers the energy from the highest SOC cell 4 (SOC L4 of 100%) to the lowest SOC cell 2 (SOC L1 of 40%) and SOC of cell 1 (SOC L3 of 80%) into SOC of cell 3 (SOC L2 of 60%), hence all the cells SOC level will be equal to 70% (SOC Lb). This battery pack balancing method is suitable for nickel and lead-acid batteries, as it avoids overcharge damage, and is cost-effective, but may result in energy losses due to dissipation as heat during balancing.
This battery balancing method uses resistors in a balancing circuit that equalizes the voltage of each cell by the dissipation of energy from higher cell voltage and formulates the entire cell voltages equivalent to the lowest cell voltage. This technique can be classified as a fixed shunt resistor and switching shunt resistor method. Also, this method should be used when charging mode only. Because discharge mode does not have reverse direction switching which results in a higher aggregated imbalance in each cycle.
The fixed shunt resistor cell balancing circuit, shown in the picture below, utilizes fixed shunt resistors (R1, R2, R3, R4, … Rn) connected in parallel with each series connected cell (V1, V2, V3, V4, … Vn) to balance each cell’s voltage. In this technique, the balancing current is effectively dispersed through the resistor, which in turn controls the voltage of each cell.
It is worth noting that this method is particularly well-suited for nickel and lead-acid battery balancing circuits. These battery types are capable of handling overcharge conditions without incurring any damage.
The switching shunt resistor cell balancing circuit, shown in the picture below, uses semiconductor switches (Q1, Q2, Q3, Q4, Qn) and fixed shunt resistors (R1, R2, R3, R4, Rn) to balance each cell’s voltage. In this circuit, each series-connected cell is linked to the resistor in parallel through controlled on/off switches or relays. The value of the resistor is carefully selected to match the required balancing current. A controller operates the circuit in two modes: continuous mode, where the switches are controlled simultaneously, and sensing mode, where a voltage sensor detects cell imbalances and decides which resistor should be shunted.
This technique, often referred to as “charge shutting,” is a popular battery balancing method for balancing Li-ion batteries. It offers increased reliability compared to the fixed shunt resistor approach. However, it’s essential to be aware that this passive cell balancing algorithm may result in some energy losses as higher currents flow through the switches and resistors during the balancing process.
Hence, these two battery balancing methods can be executed for low-power applications, with a balance current lesser than 10 mA per Ah capacity of the cell. The general comparison among passive cell balancing methodologies proposed in this article is listed in the Table above.
This method is known as a non-dissipative balancing technique that uses storage elements such as capacitors or inductors which transfer the energy from a higher charge cell to a lower charge cell until all the cells are balanced. This method can be classified based on capacitors, inductors, and power electronic converters. Also, this method can be used in both charging and discharging operations. This balancing circuit balances the cells in a shorter time and high efficiency than the passive balancing technique. But this circuit is a very complex system which increases the system cost high.
In the capacitor-based active balancing method, capacitors act as external energy storage devices to facilitate the transfer of energy between cells, thereby balancing their state of charge (SOC).
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