Lg Chem, Ltd

Shoji Tanina

Yasuhito Eguchi

Ju-Hyun Kang

Jee-Ho Kim

Dal-Hoon Lee

Young Joon Shin

Jin Seok Heo

Eguchi Yasuhito

Chang Eon Jin

Disclosed is a battery management system for transmitting a secondary protection signal and a diagnosis signal using a small number of insulation elements. N battery management units included in the battery management system transmit at least two pieces of data via one communication line through time division. N data signals transmitted from the N battery management units are transmitted in a sequential order or are mixed to one signal and transmitted to an external device.

Battery management system for transmitting secondary protection signal and diagnosis signal using a small number of insulation elements

Disclosed is a battery management system for outputting a signal, capable of determining whether an error has occurred. The battery management system, according to the present invention, includes a plurality of battery management units measuring the voltage of a secondary battery and controlling the charging and discharging thereof. The battery management units output signals when the secondary battery managed thereby is overcharged or overdischarged and errors occur in the units themselves. At this time, the plurality of battery management units output the signals to lines connected in series. In the battery management system, according to the present invention, the waveforms of the signals to be output change according to the amount of current flowing in the lines connected in series.

Battery management system for outputting signal, capable analyzing whether error has occured, and battery driving system including same

Disclosed are a communication system and a synchronization method for enabling synchronization of units included in the communication system in case of a communication line failure. In the communication system according to the present invention, all units are synchronized with the period of an ADSYNC outputted from a master unit when the ADSYNC, in which a data transmission preparation period and a data transmission period make a single cycle, is outputted from the master unit; slave units output a free-run ADSYNC when an ADSYNC is not outputted from the master unit; and, when a plurality of the slave units output free-run ADSYNCs, the slave units are synchronized with any one free-run ADSYNC from among the outputted free-run ADSYNCs.

Communication system having synchronized units and synchronization method for units

Disclosed is an apparatus and method for diagnosing an abnormality in a cell balancing circuit in a battery pack including a plurality of cells corresponding to each cell balancing circuit. The present disclosure turns off cell balancing switches included in a cell balancing circuit to be diagnosed and an adjacent cell balancing circuit among the cell balancing circuits. Also, the present disclosure stores a voltage value between nodes of the cell (hereinafter referred to as a 'diagnosis voltage value') by turning on the cell balancing switch of the cell balancing circuit to be diagnosed. Also, the present disclosure calculates a difference value between adjacent cell voltage values (hereinafter referred to as a 'cell difference value') and a difference value between adjacent diagnosis voltage values (hereinafter referred to as a &#x2018;diagnosis difference value&#x2019;).

Apparatus and method for diagnosing abnormality in cell balancing circuit

A circuit current balancing apparatus balances circuit currents among units of a battery device. The circuit current balancing apparatus is provided with a plurality of cell stacks respectively composed of at least one cell. The apparatus balances a circuit current of a control circuit connected to each of the plurality of cell stacks for controlling and monitoring a status of the cell stack. The apparatus also includes a comparator for calculating and outputting a voltage difference between an output voltage of the corresponding cell stack and a voltage of the control circuit connected to the corresponding cell stack, and a current source for adding or subtract a dummy current to/from a circuit current of the control circuit in correspondence with the output of the comparator.

Circuit current balancing method and apparatus for battery apparatus

Disclosed are a multi-battery pack system, a method for controlling battery packs, and a battery pack, in which plural battery packs provided in the multi-battery pack system can be set as a master battery pack and slave battery packs by themselves. The method for controlling the battery packs constructing the multi-battery pack system includes: a first step of checking if a communication line is maintained at a first level for a first desired amount of time when an activation signal or a message of setting a master battery pack is received; and a second step of outputting signals of a second level to the communication line for a second desired amount of time when the communication line is maintained at the first level for the first desired amount of time, and setting a battery pack as a master battery pack.

Growing community of inventors

Daejeon, South Korea

Shoji Tanina