Lanshishi Semiconductor, a world-renowned semiconductor manufacturer under the ROHM Group, has developed a lithium-ion battery monitoring LSI " ML5245 " that supports 13 series cells. It is very suitable for LEV lithium for electric bicycles, electric balance cars and electric shopping carts. Ion battery pack.
The ML5245 is a stand-alone battery monitoring LSI that supports up to 13 series-connected batteries without the need for microcontroller control. The development of battery packs is made easier by eliminating the need for professional and time-consuming microcontroller program development, helping to shorten the customer's product development cycle. In addition to the basic functions of the battery monitoring LSI, the temperature detection function, the overheat prevention function of the FET (NMOS-FET) for charging and discharging, the forced OFF function of the discharge FET, and the battery voltage reading function are added. With battery monitoring and adding peripheral circuits, the reliability of the system and the safety of the battery pack are further improved. Not only that, but the current consumption during the shutdown, which affects the power consumption during long-term storage, is only 0.1 μA.
The LSI began selling samples in April 2017 (sample price: 800 yen/piece: excluding tax), and plans to start mass production in July 2017 with a monthly capacity of 100,000 units. The production base of the pre-process is Lashibi Semiconductor Miyazaki Co., Ltd. (Miyazaki Prefecture, Japan), and the production base of the post-process is ROHM Integrated Systems (Thailand) Co., Ltd. (Thailand).
In the future, LPT will continue to meet the needs of customers for high-voltage battery monitoring systems in the industrial equipment market, using battery monitoring LSIs for lithium-ion battery packs with multi-cell series structure.
It is understood that in China, where the market scale has significantly expanded, the number of electric bicycles sold has reached 30 million units/year*2 or more, and the number of electric bicycles using lithium-ion batteries is about 2.7 million units/year, including emerging countries. The future demand growth is highly anticipated.
On the other hand, the most popular smartphones for lithium-ion batteries have experienced problems such as self-ignition and overheating of battery packs. Therefore, the safety requirements for lithium-ion battery packs such as electric bicycles are becoming higher and higher.
As a countermeasure, in the past, the safety of the battery pack was ensured by adding a peripheral circuit to the battery monitoring LSI, and the newly developed ML5245 integrated these peripheral circuit functions, thereby achieving system miniaturization and higher reliability, and Further improve the safety of the battery pack.
1. Adopting independent design to make the development of lithium-ion battery pack easier
The "ML5245" uses a stand-alone design that does not require microcontroller control. It does not require a microcontroller program, making battery pack development easier and helping to shorten the development cycle of customer products.
2. Equipped with a variety of functions to make lithium-ion battery packs more secure
In addition to the overcharge/overdischarge, charge/discharge overcurrent, and short-circuit current detection functions of each battery included in the battery monitor LSI, the following functions are installed to improve the safety of the battery pack. Thereby, the number of peripheral circuits and components constituting the battery pack is reduced, miniaturization and higher reliability are achieved.
Built-in temperature detection
It is equipped with a temperature sensor installed in the battery module to directly detect the temperature inside the module to monitor and protect the high temperature/low temperature state. These detection functions control the ON/OFF of the charge/discharge FET without the need for microcontroller control.
Built-in charge and discharge FET overheat prevention function
In an electric bicycle or the like, a large current exceeding 30 A to 50 A may flow in the battery pack. Therefore, as a countermeasure against overheating of the body diode of the charge/discharge FET, a plurality of FETs are connected in parallel (the FET for heat dissipation measures), and there is a measure. The problem of increased installation area and size. The "ML5245" has a function of turning on the FET when the body diode of the charge/discharge FET exceeds a certain amount of current, thereby preventing overheating. Therefore, an FET for heat dissipation countermeasure is not required.
Built-in charge and discharge FET forced OFF function
When an abnormality occurs in a system other than the lithium-ion battery pack, it is necessary to safely stop the operation of the battery pack. In this regard, a function of forcibly turning off the charge/discharge control FET from an input signal such as an external MCU is added.
Equipped with battery voltage reading function
The "ML5245" is equipped with a function to output the battery voltage of each section. For example, using an external microcontroller, the voltage value of each battery output from the LSI can be used to calculate the remaining battery capacity of the battery pack and predict the life of each battery.
3. Low current consumption when shutting down
Like the other battery monitoring LSIs of our company, the "ML5245" achieves the industry's lowest current consumption of 0.1μA (typ.) at shutdown. Therefore, the current loss during storage of the battery pack can be kept to a minimum, thereby achieving long-term storage of the battery pack.
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