你的位置：Serial Number | Model | Resistance（mΩ) | TCR（ppm/℃) | Accuracy（%） | Encapsulation |
1 | 1206ML10FR002 | 2 | ±75 | ±1 | 1206 |
2 | 1206ML10FR005 | 5 | ±75 | ±1 | 1206 |
3 | 1206ML10FR010 | 10 | ±75 | ±1 | 1206 |
4 | 2512MA03FR001S | 1 | ±75 | ±1 | 2512 |
5 | 2512MA03FR002S | 2 | ±50 | ±1 | 2512 |
6 | 2512MA03FR005S | 5 | ±50 | ±1 | 2512 |
7 | 2512MA03FR010S | 10 | ±50 | ±1 | 2512 |
CSR Typical Application - Multi cell Lithium Battery BMS
Current sensing resistor (CSR) is mainly used in multi cell lithium battery management systems (BMS) to accurately measure the current in the battery pack. By monitoring the current, BMS can prevent overcharging and overdischarging of the battery, thereby extending its lifespan and ensuring safe use. CSR is usually connected in series with the battery and calculates the current value by detecting the voltage drop generated by the current flowing through the resistor. This measurement is crucial for achieving efficient management of batteries, protecting batteries from damage, and optimizing battery performance.
- Current monitoring and control
- Improve energy efficiency
- Overcurrent protection
- Accurate voltage reference
- thermal management
- Improve system reliability
How to maintain CSR in BMS to ensure long-term stability?
Chemical composition and physical structure:
Lithium ion batteries typically use liquid electrolytes, while lithium polymer batteries use solid polymer electrolytes. This means that when designing BMS, it is necessary to consider the impact of different electrolytes on current sensing and thermal management. Lithium polymer batteries, due to their plasticity, can be designed in different shapes and sizes, which may affect the layout and integration of CSR.
Thermal management:
The thermal management requirements for lithium-ion batteries and lithium polymer batteries may differ. Lithium ion batteries may require more complex cooling systems to prevent overheating, while lithium polymer batteries may have relatively relaxed requirements for thermal management due to their lower risk of thermal runaway. Therefore, the role of CSR in monitoring and controlling battery temperature may vary.
Charge and discharge characteristics:
The charging and discharging characteristics of lithium-ion batteries and lithium polymer batteries may differ, which can affect the configuration of CSR in BMS. For example, certain types of lithium-ion batteries may require more precise charging control to prevent overcharging, while lithium polymer batteries may require stricter current limitations during discharge.
Energy density and power density:
Lithium polymer batteries typically have higher energy density and power density, which may affect the design of CSR to ensure accurate sensing of current even under high current loads.
Security performance:
Due to the differences in safety between lithium-ion batteries and lithium polymer batteries, CSR in BMS may require different safety strategies. For example, lithium-ion batteries may require stricter overcurrent and short-circuit protection, while lithium polymer batteries may focus more on preventing overheating.
How to choose CSR suitable for BMS applications?
Choosing the appropriate CSR is crucial for ensuring the performance of BMS and the safety of the battery. When designing, it is necessary to consider the rated power, accuracy, temperature coefficient, size, and cost of CSR. CSR that can withstand expected current and power, while having sufficient accuracy to ensure accurate current monitoring, should be selected. A low temperature coefficient helps maintain stability at different ambient temperatures. In addition, it is necessary to consider the physical dimensions of CSR to ensure its compatibility with other components in the battery pack.
How to maintain CSR in BMS to ensure long-term stability?
Choosing the appropriate CSR is crucial for ensuring the performance of BMS and the safety of the battery. When designing, it is necessary to consider the rated power, accuracy, temperature coefficient, size, and cost of CSR. CSR that can withstand expected current and power, while having sufficient accuracy to ensure accurate current monitoring, should be selected. A low temperature coefficient helps maintain stability at different ambient temperatures. In addition, it is necessary to consider the physical dimensions of CSR to ensure its compatibility with other components in the battery pack.
Generic Application
- CSR is used to improve energy efficiency and power management across all types of adapters. By precise current monitoring and optimizing the thermal design of the adapter, the product life can be extended. Support the miniaturization design of adapters while maintaining high performance and reliability.
What are the considerations for CSR in design?
Factors to consider during design include resistance value, power rating, temperature coefficient, packaging size, and cost. Low resistance values can reduce power loss, but may require more precise amplifiers. In addition, resistors with low temperature coefficients can provide more stable measurements, but the cost may be higher.
What are the possible problems that CSR may encounter in practical applications?
Possible problems encountered in practical applications include the influence of parasitic resistance, errors caused by PCB layout, and changes in resistance values due to environmental temperature fluctuations. To reduce these effects, Kelvin connections (four terminal connections) can be used to minimize the impact of parasitic resistance, and the performance of the signal chain can be optimized through carefully designed PCB layouts.