Charge and discharge management of lithium battery

Due to the lithium ion batteries advantage in energy density, lithium ion battery compared with using nickel cadmium battery and nickel metal hydride batteries, can reduce the complexity of the system and the comprehensive cost.However, the use of the quality of the charging system for battery life and working reliability has an important influence.

Intelligent battery

Currently in the rechargeable battery charge/discharge management, widely used for a variety of facilitating and MCU/CPU for data exchange, processing all kinds of bus technology, such as a bus (Bitbus) (SMBus), integrated circuit, system management bus data exchange between the bus (I2C), universal serial bus (USB) and simple peripheral bus (SPI), etc.

In a laptop, for example, by using can bus technology for the battery status, battery, battery, battery soc available time is normal battery parameters, such as management and detection, and work on the battery state data show, when the battery power after use, the computer can be automatically shut down, save the data.Also in the widely used mobile phone, the technology has been widely used, has made great user use.

Someone smart battery is defined as: under the battery + + electronic components control bus = smart battery.Intelligent battery, SMBus and intelligent battery charger of the smart battery system (SBS).

Multiple class lithium ion battery charge/discharge protection control integrated circuit

Because the lithium ion rechargeable battery has a series of advantages, scope of application is more extensive, some of the major integrated circuit manufacturing companies in the world (e.g., TI, Maxim, SII, Linear, Freescal, National and Intersil corporation, etc.) have launched a lot of various types of lithium ion batteries management with integrated circuit.The company production of lithium ion rechargeable batteries management with different characteristics of integrated circuits, excellent performance, can be in each section of the lithium ion battery charge/discharge working status and charge/discharge temperature detection and protection.Some using 8-bit MCU kernel and the lithium ion battery charge/discharge work status register of lithium ion battery charge/discharge working status register and the analysis judgment, to ensure that each section lithium ion battery sufficient electricity, and extend its service life.

Such as Japanese seiko corporation (SII) recently launched the S - 8204 - a/B series section 3/4 section lithium-ion battery charge/discharge control integrated circuit.S - 8204 - a/B series integrated circuit with built-in precision voltage detector and delay circuit, and can be used in lithium ion batteries and battery charge/discharge management, has a lithium-ion battery charge/discharge temperature detection, overcharge, over discharge, over current protection control function, can be implemented for each section of the lithium ion battery charge/discharge protection control.S - 8204 - a/B series integrated circuit with simple to use, convenient and less use of peripheral components etc.

When using, if the two S - 8204 - a/B series integrated circuit in series, can achieve section 5 ~ 8 series of lithium ion battery charge/discharge protection control.If more of the S - 8204 - a/B series, could be used to more section of the lithium ion battery charge/discharge protection control applications.The electric car, electric tools and UPS need high voltage applications is very attractive.In these applications, often need to 5 ~ 12 lithium-ion batteries in series, the average power supply voltage range from 18 to 43.2 V.

SII S - 8204 a/B series integrated circuit can be respectively used for p-channel MOSFET tube lithium-ion battery pack high charge/discharge protection control and n-channel MOSFET tube low-end lithium ion battery charge/discharge protection control applications.

Again such as TI company launched bq2150H lithium ion battery charge/discharge detection and protection control integrated circuit, it can be used for 2 ~ 5 lithium-ion batteries in series with the charge/discharge applications, can be used alone, and can take five LED the working state of charge/discharge instructions.

TI's UCC3957 section is used for 3/4 of lithium ion battery charge/discharge protection of integrated circuit, through the state of the internal mechanism, can achieve for each section tandem charge/discharge of the lithium ion battery charge/discharge detection protection and lithium ion battery discharge current protection.UCC3957 by answer the p-channel MOSFET tube to realize the control of the management of the lithium ion battery charge/discharge, using two levels of charge/discharge current management control.If in lithium ion batteries with lithium ion battery charge/discharge process not connected, through UCC3957 detection can realize corresponding protection control.

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