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Optimizing Charge Cycles and Battery Life
Due to its cutting-edge characteristics, Li-ion technology is the first choice for modern high-performance batteries. Li-ion batteries are up to 30 percent smaller and 50 percent lighter than conventional NiMH batteries yet store much more energy. While they offer concrete advantages in terms of size, weight, recharge speed and resistance to memory effects, Li-ion batteries do have higher cost compared to other battery types. This can be improved by using a battery management system which optimizes the battery performance. The Atmel® Li-ion battery management solution offers high accuracy analog measurement functions in combination with efficient active cell balancing ensuring optimum usage of battery capacity.
The Atmel megaAVR® ATmega32HVE2 and ATmega64HVE2 microcontrollers ( MCUs) improve the performance and longevity of 12V standard lead-acid batteries. Designed for intelligent battery sensor applications, the devices determine the state of charge and state of health for 12V standard lead-acid batteries by measuring the battery voltage, current and temperature. For cars with idle-stop-go function, this feature is mandatory to retain sufficient battery energy for a guaranteed engine start.
Combined with the Atmel ATA6870 Li-ion battery monitor IC, it forms an ideal system solution for replacing 12V standard lead-acid batteries with Li-ion batteries.
Key Features
- Active balancing — Atmel's battery management solution is the industry's first to feature active cell balancing for high cell count Li-ion batteries to prevent energy loss.
- Maximum safety — Highest accuracy due to simultaneous cell voltage measurement of the cells in the entire battery stack leading to precise state-of-charge and state-of health calculations.
- Smart sensing — Atmel's smart sensing technology enables you to measure the battery voltage, current and temperature with up to 18-bit accuracy.
- Valuable development tools — Atmel’s PC-controlled development kits help you easily build your battery management system and get the most of the battery management devices.
Battery Management Devices
| Device Family |
Summary Benefit |
Applications |
Technologies |
Key Parameters |
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Extended range for electrical vehicles at lower cost
Reduced fuel consumption and CO2 emissions for hybrid vehicles |
Li-Ion battery management
Replacement of 12V standard lead-acid batteries |
Active cell balancing
Simultaneous cell voltage measurement |
High-current active cell balancing
High-accuracy analog measurement functions |
Atmel Li-Ion battery management ICs offer simultaneous cell voltage measurement for the entire battery stack. Measuring the cell voltage of a battery stack at the same time and at the same battery current provides more precise results when calculating the battery's state-of-charge and state-of-health. Active cell balancing with currents in the range of 1A to 3 A enables customers to perform cell balancing during the charging and discharging process. During charging, weak cells can be aligned to ensure that all cells within a stack are charged to their maximum capacity. Energy-efficient active cell balancing during the discharging process allows for feeding weak cells with the energy of stronger cells. This permits to fully utilize the capacity of all cells within a stack until the last Coulomb. The cell voltage measurement and active cell balancing features help to maximize the available battery capacity, extend the cruising range of electrical vehicles, and to reduce cost.
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Improve the performance and longevity of 12V standard lead-acid batteries
Include industry's best-in-class LIN transceiver with highest EMC immunity and OEM approvals worldwide
Ensure a guaranteed engine start of cars with idle-stop-go function |
12V standard lead-acid starter batteries
Cars with stop-go functionality |
MCUs with smart sensing technology |
Measuring the battery voltage, current and temperature of 12V starter batteries with up to 18-bit accuracy |
The Atmel® ATmega32 and ATmega64HVE2 devices are system-in package solutions including a high-precision analog front end for current measurement with an 18-bit ∑∆-ADC and a programmable gain amplifier with an offset voltage of less than 5µV to measure currents ranging from several mA up to 1000A. The 17-bit/7-input-channel ADC in the device can be used for many options including battery voltage and cell temperature measurement. The circuit is based on an 8-bit AVR® core with up to 64kB Flash memory and a 32-bit math extension module enabling exceptionally short execution times for complex state-of-start algorithms, typical in battery management systems.
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