Lg Chem, Ltd

Lg Energy Solution, Ltd.

Se-Wook Seo

Jin-Hyung Lim

Yo-Han Ko

Yong-Seok Choi

Dal-Mo Kang

Seung-Hun Jung

Won-Tae Joe

Du-Seong Yoon

Sang-Il Son

Gi-Min Nam

Su-Hyun Chae

Yong-Jun Kim

Cheol-Soo Lee

Hyeong-Seok Kim

An apparatus estimating a state of charge (SOC)-open circuit voltage (OCV) profile, including: a storage unit storing: a beginning of life (BOL) positive electrode (PE) half-cell SOC-OCV profile and available range (AR), a BOL negative electrode (NE) half-cell SOC-OCV profile and AR, and a BOL full-cell SOC-OCV profile and total capacity (TC), and a control unit estimating a full-cell SOC-OCV profile at middle of life (MOL), including: an AR determination module for: calculating an MOL full-cell TC while a secondary battery is fully charged/discharged at MOL, and determining the MOL PE and NE ARs so a ratio of the MOL to the BOL full-cell TCs equals a ratio of the MOL to the BOL PE ARs and a ratio of the MOL to the BOL NE ARs, and a profile management module for: estimating, as an MOL full-cell SOC-OCV profile, a differential profile, and updating the BOL full-cell SOC-OCV profile.

Method and apparatus for estimating SOC-OCV profile

An apparatus for estimating a state of a secondary battery (SB), including: a charging unit electrically connected to two terminals of the SB, the charging unit charging the SB, a voltage measuring unit electrically connected to and measuring a voltage across the two terminals of the SB, a time measuring unit for: receiving a voltage value of the SB from the voltage measuring unit, and during charging of the SB, in a predefined voltage range, measuring a charge time of the SB corresponding to the voltage range multiple times, and a control unit for: transmitting/receiving an electrical signal to/from the charging unit, the voltage measuring unit, and the time measuring unit, calculating a ratio of a first charge time and a second charge time measured by the time measuring unit sequentially at a time interval, and estimating a state of the SB.

Apparatus and method for estimating state of secondary battery

An apparatus for estimating a capacity retention rate of a secondary battery from a degree of calendar aging and a degree of cycle aging of the secondary battery included in a battery pack, including a control unit that receives current information and temperature information of the secondary battery from a sensing unit installed in the battery pack in each cycle having a preset time length, and performs a first main process and a second main process in a sequential order, a memory that stores a predetermined weighting factor, and further stores a state of charge, a degree of cycle aging and a degree of calendar aging of the secondary battery updated in each cycle when the first main process is performed.

Apparatus and method for estimating capacity retention ratio of secondary battery

A battery testing apparatus including a memory unit configured to store profile data of a battery; an interface unit configured to receive a signal designating a specific future date after the beginning of life of the battery at which a lowest SOC according to degradation of the battery is to be predicted; and a processor connected to the memory and interface units to communicate therewith. The profile data includes first, second and third look-up tables in which open circuit voltages for each SOC from the battery in the beginning of life, closed and open circuit voltages for each SOC from an equivalent circuit of the battery in the beginning of life, and resistance increase rates predetermined for each use period, are respectively recorded. The processor predicts the lowest SOC at the specific date according to the degradation of the battery with reference to the first, second and third look-up tables.

Battery testing apparatus and method

An apparatus for estimating a degree of aging of a secondary battery is configured to: determine a current and a temperature of the secondary battery; determine a state of charge from the current of the secondary battery; determine a degree of calendar aging by applying a cumulative degree-of-aging model to a degree-of-calendar-aging profile corresponding to the determined state of charge and the determined temperature while the secondary battery is in a calendar state; determine a degree of cycle aging by applying the cumulative degree-of-aging model to a degree-of-cycle-aging profile corresponding to the state of charge, the temperature, and the current of the secondary battery while the secondary battery is in a cycle state; and determine, as the degree of aging of the secondary battery, a weighted average value calculated for the determined degree of calendar aging and the determined degree of cycle aging based on calendar time and cycle time.

Apparatus and method for estimating degree of aging of secondary battery

An apparatus and method for conducting a nail penetration test for a secondary battery are provided. The apparatus for conducting the nail penetration test includes: a stage on which the secondary battery, which is an object of the nail penetration test, is fixed; a nail penetration unit including a nail elevating/lowering means; a voltage measuring unit configured to repeatedly measure a short-circuit voltage of the secondary battery with a time interval during the nail penetration test; and a controller operably coupled to the voltage measuring unit. The controller periodically receives a short-circuit voltage from the voltage measuring unit, determines a short-circuit current allowing the received short-circuit voltage to be applied between outermost nodes of an equivalent circuit which models the secondary battery whenever the short-circuit voltage is received, and visually outputs a change in the determined value of the short-circuit current according to time through a display unit.

Apparatus and method for conducting nail penetration test for secondary battery

An apparatus and method for adjusting a charging condition of a secondary battery are provided. The apparatus includes: a controller configured to receive measurement results from a current measuring unit and a temperature measuring unit of the secondary battery, determine a charging current value and a current temperature value, determine a predicted overheat amount required to raise the temperature of the secondary battery from the current temperature to a threshold temperature for a preset reference time by using a predefined thermodynamic calculation equation, determine a predicted charging current required to generate the predicted overheat amount through charging, determine a predicted charging voltage expected when the predicted charging current flows through an equivalent circuit of the secondary battery, and when a condition of the predicted charging voltage being lower than a preset upper limit charging voltage is satisfied, adjust the upper limit charging voltage such that the upper limit charging voltage is lowered to the predicted charging voltage.

Apparatus and method for adjusting charging condition of secondary battery

Disclosed is an overcurrent simulation method when a nail penetrates a secondary battery and a recording medium storing the program. The overcurrent simulation method according to the present disclosure constructs a safety device and a secondary battery equivalent circuit, and produces a nail penetration effect by changing a resistance value. In this instance, various current simulations may be obtained by changing a first metal sheet and a second metal sheet included in the safety device, and a resistance value limiting an overcurrent may be calculated.

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Daejeon, South Korea

Se-Wook Seo