Samsung Sdi Co., Inc.

Pohang University of Science and Technology Foundation

Jake Kim

Sung-Soo Kim

Giheon Kim

Kyeong-Beom Cheong

Byeonghui Lim

Christober Rayappan

Sungwook Paek

Yongjun Hwang

Seon-Hong Lee

Jee-Hoon Han

Byong-Gon Lee

Sung-soo Kim

Yoon-Chang Kim

Gi Heon Kim

Jong-Man Kim

Ho-Yul Baek

Maeng-Eun Lee

Seok-Gyun Woo

Joo Han Song

Do-Hyung Park

Jong-Ki Lee

So-Ra Lee

Nam-Soon Choi

Kyeu-Yoon Sheem

Jun-Sik Kim

Seol-Ah Lee

Jeongsoon Shin

Chong-Hoon Lee

Min Jeong Kang

Hoyul Baek

Jae-Rok Kim

Young-Woong Kwon

Hee-Sung Choi

Jongman Kim

Ki-Soo Lee

Cheol Ho Park

Seung Bum Suh

Joo-Han Song

Wonseok Kim

Su Dong Lee

In-Ho Jung

Inho Jung

Jang-Woo Lee

Jee-Won Kang

Younghwa Ko

Heekwan Chai

Ho-Gon You

Youngbin Song

Seung Ho Yang

Minhwan Seo

Seungyeon Kang

Min-Hwan Kim

Minjeong Kang

Yongsic Kim

Kwangki Baeg

Bounggun Joung

Hyunju Oh

Yoohong Jang

Yong Jun Hwang

Byeong Hui Lim

Sung Wook Paek

Wonseock Kim

Boung Gun Joung

A method of estimating a state of charge of a battery, includes: generating a present voltage value V(k) and a present current value I(k) by detecting a voltage and a current of the battery; determining a reference open-circuit voltage value V(k) based on a state-of-charge estimation value SOC(k); estimating first to third parameter values α(k), α(k), and α(k) from the present voltage value V(k), the reference open-circuit voltage value V(k), the present current value I(k), and a previous current value I(k−1) by using recursive least squares (RLS); and determining, using an extended Kalman filter (EKF), a next state-of-charge estimation value SOC(k+1) of the battery from the state-of-charge estimation value SOC(k), the present voltage value V(k), the reference open-circuit voltage value V(k), the present current value I(k), the previous current value I(k−1), and the first to third parameter values α(k), α(k), and α(k).

Method of estimating state of charge of battery

A method for detecting an abnormal battery cell includes periodically generating a voltage value and a current value for each of battery cells, updating, in real time by using an adaptive filter, a G parameter value and an H parameter value of each of battery cells, based on the voltage value and the current value, calculating a representative G parameter value and a representative H parameter value, and determining whether each of the battery cells is an abnormally deteriorated cell based on the G parameter value and the H parameter value of each of the battery cells, the representative G parameter value, and the representative H parameter value. The G parameter indicates sensitivity of voltage with respect to a change in current of the battery cell, and the H parameter indicates an effective potential determined by a local equilibrium potential distribution and a resistance distribution in the battery cell.

Method for detecting abnormal battery cell

Provided is a method of estimating the state of health of the battery according to various embodiments. The method of estimating the state of health of the battery comprises: measuring a voltage and current of a battery in use to periodically generate a voltage value and a current value; using an adaptive filter to periodically update a G parameter value and an H parameter value in real time from the voltage value and the current value, said parameters indicating the present state of the battery; and using an initial value and a final value of the G parameter that is preset and a present value of the G parameter to estimate the state of health of the battery in real time. The G parameter is a parameter that represents the sensitivity of the voltage to changes in the current of the battery, and the H parameter is a parameter that represents an effective potential determined by the local equilibrium potential distribution and resistance distribution inside the battery.

Method for estimating state of health of battery

An internal short-circuit cell detection method includes detecting a voltage and current of each of a plurality of battery cells, updating in real time G and H parameter values by using an adaptive filter, calculating a G parameter representative value, and calculating an H parameter representative value, and determining whether a short circuit occurs in each of the plurality of battery cells, based on the G and H parameter value of each of the plurality of battery cells, the G parameter representative value, and the H parameter representative value. The G parameter is a parameter indicating a sensitivity of a voltage to a change in current of each of the plurality of battery cells, and the H parameter is a parameter indicating an effective potential determined by a local equilibrium potential distribution and a resistance distribution in each of the plurality of battery cells.

Method for detecting internal short-circuited cell

A battery state estimation method includes: periodically measuring voltage and current of a battery in use to generate a voltage value and a current value; using an adaptive filter to generate a G parameter value for a G parameter and an H parameter value for an H parameter in real time from the voltage value and the current value, the G and H parameters indicating a present state of the battery; and using the G parameter value and the H parameter value to estimate the present state of the battery in real time. The G parameter is a parameter that represents sensitivity of the voltage to changes in the current of the battery, and the H parameter is a parameter that represents an effective potential determined by local equilibrium potential distribution and resistance distribution inside the battery.

Battery state estimation method

A method of charging a battery, wherein the battery comprises a plurality of battery cells, includes charging the battery with a first voltage for a first time period, which charging is first charging, charging the battery with a second voltage for a second time period, which charging is second charging, and charging the battery with a third voltage for a third time period, which charging is third charging, wherein lengths of the first to third time periods are determined in correspondence with a magnitude of charging current of the battery.

Battery charging method with mutiple constant voltages and battery charging apparatus employing the same

A secondary battery and a method of manufacturing the same are disclosed. In one aspect, the method includes preparing an electrode assembly comprising a positive electrode plate, a negative electrode plate, and a separator interposed therebetween. The method also includes freezing the electrode assembly after the electrode assembly is filled with an electrolyte solution, dipping the frozen electrode assembly in a liquid polymer material, retrieving the dipped electrode assembly from the liquid polymer material, and curing an external surface of the electrode assembly.

Secondary battery including polymer material layer and method of manufacturing the same, having a case seamlessly formed as a single body

A negative electrode for a rechargeable lithium battery that includes a negative active material layer including a carbon-based material having a peak of about 20 degrees to 30 degrees at a (002) plane in an X-ray diffraction pattern using a CuK&#x3b1; ray, and an SEI (solid electrolyte interface) passivation film including at least one material selected from an organic material and an inorganic material and having an average thickness of about 10 nm to about 50 nm on the surface of the active material layer of the electrode.

Negative electrode for rechargeable lithium battery, rechargeable lithium battery including same and method of preparing rechargeable lithium battery

An electrode for a rechargeable lithium battery includes an electrode active material and a copolymer represented by where A is selected from &#x2014;O&#x2014;(CFR&#x2014;CFR)&#x2014;, &#x2014;(CFR&#x2014;CFR)&#x2014; and combinations thereof, each of Rthrough Ris independently selected from fluorine, C1-C4 alkyls and C1-C4 fluorinated alkyls, and each of x and y is an integer ranging from 1 to 100,000.

Electrode for rechargeable lithium battery and rechargeable lithium battery including the same

Embodiments of the present invention provide an accelerated lifetime estimation device for predicting the lifetime of a secondary battery, and a method thereof. The accelerated lifetime estimation device can accurately estimate a normal lifetime of the secondary battery while reducing an evaluation time period of the secondary battery.

Device for estimating a lifetime of a secondary battery and method thereof

A secondary battery is disclosed. In one aspect, the battery includes an electrode assembly including i) a positive electrode plate on which a positive active material is formed, ii) a negative electrode plate on which a negative active material is formed, and iii) a separator separating the positive and negative electrode plates. The battery also includes a can accommodating the electrode assembly, wherein the can has an inner surface facing the electrode assembly, an inner active material layer formed on the inner surface of the can and a securing layer covering the inner active material layer.

Secondary battery

A device for analyzing a film on a surface of an electrode for a rechargeable lithium battery includes: an inert chamber capable of maintaining an inert atmosphere including controlled amounts of moisture and oxygen and including an inner space for pretreating a sample including the film on the surface of the electrode; a first analyzer coupled to the inert chamber through a connection tube, the first analyzer being configured to receive the sample and being configured to provide composition and thickness information of the film; an inert holder configured to be assembled around the sample in the inert chamber and configured to maintain the inert atmosphere around the sample; and a second analyzer mounted with the inert holder therein and configured to provide shape information of the film. A method of analyzing a film on a surface of an electrode using the device is also disclosed.

Device for analyzing film on surface of electrode for rechargeable lithium battery and method of analyzing film on surface of electrode for rechargeable lithium battery using same

A piezoelectric element layer is further formed as a package material of a secondary battery, so that the secondary battery can be self-charged using a voltage generated in the piezoelectric element layer according to vibration generated in an electronic device and vibration generated by movement of the electronic device itself. The secondary battery includes a battery case that accommodates an electrode assembly, the battery case having an outer coating layer and a piezoelectric element layer formed on an inner surface of the outer coating layer, and a protection circuit module mounted to an outside of the battery case and electrically connected to the electrode assembly. In the secondary battery, a voltage storage is provided to the protection circuit module, and the piezoelectric element layer converts absorbed vibration into voltage and then stores the voltage in the voltage storage so that the secondary battery is self-charged as occasion demands.

An electrode assembly comprises a first electrode including a first electrode current collector and a first electrode active material layer, a second electrode including a second electrode current collector and a second electrode active material layer, a separator disposed between the first electrode and the second electrode, and an electrode absorbing member in contact with the first electrode.

Electrode assembly and rechargeable battery using the same

A secondary battery includes a battery unit that has an accommodation space for an electrode assembly, a vent housing that defines a housing space connected with the accommodation space through a first vent hole, the vent housing including a second vent hole through which the housing space is connected with an outside of the secondary battery, a revolving member that is rotatably mounted between a closing position for closing the first and second vent holes and an opening position for opening the first and second vent holes, and first and second sealing caps that are formed at opposite sides of the revolving member with respect to a rotation axis of the revolving member. The first and second sealing caps respectively close the first and second vent holes, when the revolving member is mounted at the closing position.

Growing community of inventors

Yongin-si, South Korea

Jake Kim