Used lithium battery capacity measurement device, with SD card (HK-LF85)
HK-LF85・Release Battery (HL8-5)・Add Battery (KB-LF84-50)
A charger tailored for the battery and a discharger set with microcontroller-controlled discharge, achieving accuracy comparable to constant current load devices, while also being low-cost and capable of measuring battery capacity (SOH).
The measurement principle is the same as measuring the water volume by discharging after the dam is full. Regarding charging, even at the same full water level (voltage), the water retention varies depending on whether the water is poured in like a flood or gently. The charging system initially charges in bulk (8.4V-50A, CC charging) and then gently charges towards the end (CV charging), allowing for the rapid creation of fully charged batteries. At the end of the process, the microcontroller detects the drop in current and automatically terminates the charging, resulting in a consistent charging state. Discharge occurs with the same resistance body releasing the same power. A computer software is included that saves the voltage at every moment to an SD card and automatically calculates the total energy discharged during operation. The HK-LF85 is a model developed for used NISSAN LEAF batteries (LIB) with a capacity of 500Wh, capable of charging and discharging at a maximum of 50A, with a charging and discharging test for one module taking about 3 hours. Customization for other lithium batteries is also possible. (Patent application pending)
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basic information
<<Charger>>: 1) Equipped with a temperature sensor for safety considerations. 2) Automatically stops when detecting a decrease in current during CV charging (below 1A). <<Discharger>>: 1) Capable of discharging large currents (approximately 7.5V-50A [around 400W]) with resistance (current) tailored to the battery and precise discharge stop. 2) Discharges all energy up to the specified voltage (in 1/100V units, 12-bit AD conversion). No over-discharge. 3) Current interruption is done with FETs, preventing sparks. 4) GND is floating with a phot coupler (allowing multiple simultaneous controls). 5) Lightweight aluminum casing, weighing 1.9 kg. 6) Principle for calculating chargeable energy (SOH) based on voltage and discharge time every second. 7) Simple operation with one button for discharge activation and automatic stop. 8) The attached software allows printing of discharge curves and analysis values. 9) Customizable resistance values, operating programs, and aggregation programs.
Price information
List price: 273,000 yen (set including charger, discharger, and software... excluding tax) Customization will incur an additional charge.
Price range
P3
Delivery Time
※It will vary depending on the quantity and specifications over a period of two months, so please feel free to contact us.
Applications/Examples of results
Measure multiple used LEAF lithium batteries, combine those with the same capacity (SOH) into a package, and use them instead of 12V or 24V lead batteries. When using used batteries in series, it is essential to match the SOH of each module to achieve adequate performance. Using them in an unbalanced state can lead to early damage of the batteries. The reuse of EV batteries is expected as a substitute for lead batteries in applications such as golf carts, mobility scooters, and backup batteries for solar power generation.
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Company information
Hamamatsu Computing Co., Ltd. provides computer repair services for businesses and word processor repairs, while also developing and selling a battery capacity measuring device (diagnostic machine) with its own unique technology. Since the programs are developed in-house, various original specifications are possible. Please feel free to contact us.