Abstract: Provided is a secondary battery for testing an internal short, and a method and apparatus for testing an internal short of a secondary battery using the same. The secondary battery for testing an internal short according to the present disclosure includes a positive electrode side metal terminal having one end disposed between a positive electrode plate and a separator of the secondary battery, and a negative electrode side metal terminal having one end disposed between a negative electrode plate and the separator of the secondary battery, and is used to cause an internal short by contact between the other end of the positive electrode side metal terminal and the other end of the negative electrode side metal terminal.

Abstract: A battery pack charging system includes a battery pack comprising a plurality of battery cells; a charging device connected to both electrodes of the battery pack to supply a charging current to the battery pack; a switch connected between the battery pack and the charging device to allow or block a flow of the charging current; and a current blocking member mechanically connected to the switch and configured to turn off the switch by causing a bending deformation when a potential difference formed between both electrodes of the battery pack is equal to or greater than a reference value.

Abstract: An electrode performance evaluation system and an electrode performance evaluation method is disclosed. The method includes acquiring impedance measurement data for different frequencies by applying an alternating current signal to an electrode assembly including an electrode which is immersed in an electrolyte solution, calculating impedance calculation data for different frequencies while changing the frequency of an impedance equation corresponding to a circuit model of the electrode assembly, calculating the resistance value of ion bulk resistance in the electrolyte solution using the ion conductivity of the electrolyte solution, the area of the electrode and the thickness and porosity of an active material layer of the electrode, and determining effective tortuosity as a factor of the electrode performance based on the impedance measurement data for different frequencies, the impedance calculation data for different frequencies and the resistance value of the ion bulk resistance.

Abstract: A battery pack charging system includes a battery pack comprising a plurality of battery cells; a charging device connected to both electrodes of the battery pack to supply a charging current to the battery pack; a switch connected between the battery pack and the charging device to allow or block a flow of the charging current; and a current blocking member mechanically connected to the switch and configured to turn off the switch by causing a bending deformation when a potential difference formed between both electrodes of the battery pack is equal to or greater than a reference value.

Abstract: Provided is a secondary battery for testing an internal short, and a method and apparatus for testing an internal short of a secondary battery using the same. The secondary battery for testing an internal short according to the present disclosure includes a positive electrode side metal terminal having one end disposed between a positive electrode plate and a separator of the secondary battery, and a negative electrode side metal terminal having one end disposed between a negative electrode plate and the separator of the secondary battery, and is used to cause an internal short by contact between the other end of the positive electrode side metal terminal and the other end of the negative electrode side metal terminal.

Abstract: An electrode performance evaluation system and an electrode performance evaluation method is disclosed. The method includes acquiring impedance measurement data for different frequencies by applying an alternating current signal to an electrode assembly including an electrode which is immersed in an electrolyte solution, calculating impedance calculation data for different frequencies while changing the frequency of an impedance equation corresponding to a circuit model of the electrode assembly, calculating the resistance value of ion bulk resistance in the electrolyte solution using the ion conductivity of the electrolyte solution, the area of the electrode and the thickness and porosity of an active material layer of the electrode, and determining effective tortuosity as a factor of the electrode performance based on the impedance measurement data for different frequencies, the impedance calculation data for different frequencies and the resistance value of the ion bulk resistance.

Abstract: The present disclosure is intended to design a secondary battery with improved boosting charge performance by estimating reaction in the thickness-wise direction of the electrode, and provides a method or estimating reaction of a secondary battery including (a) preparing a battery cell having a structure of first electrode/separator/reference electrode/separator/second electrode, wherein the second electrode has a structure of upper layer/porous film/lower layer, (b) setting a charging condition to estimate reaction of the battery cell, (c) measuring voltage and current of each of the upper layer, the lower layer and the battery cell while the set charging condition is reached, (d) after the charging condition, measuring an open-circuit voltage of the upper layer, the lower layer and the battery cell, and (e) comparatively analyzing a capacity obtained using the measured current with the measured open-circuit voltage, and a battery cell used for the same.

Abstract: Provided are a method of predicting a battery charge limit not to cause lithium (Li)-plating, and a battery charging method and apparatus capable of quickly charging a battery based on the battery charge limit. A battery charge limit prediction method according to the present disclosure includes (a) fabricating a three-electrode cell including a unit cell and a reference electrode, (b) measuring a negative electrode potential (CCV) based on a state of charge (SOC) while charging the three-electrode cell, and (c) determining a point at which the negative electrode potential is not dropped but starts to be constant, as a lithium (Li)-plating occurrence point, and setting the Li-plating occurrence point as a charge limit.

Abstract: The present disclosure is intended to design a secondary battery with improved boosting charge performance by estimating reaction in the thickness-wise direction of the electrode, and provides a method or estimating reaction of a secondary battery including (a) preparing a battery cell having a structure of first electrode/separator/reference electrode/separator/second electrode, wherein the second electrode has a structure of upper layer/porous film/lower layer, (b) setting a charging condition to estimate reaction of the battery cell, (c) measuring voltage and current of each of the upper layer, the lower layer and the battery cell while the set charging condition is reached, (d) after the charging condition, measuring an open-circuit voltage of the upper layer, the lower layer and the battery cell, and (e) comparatively analyzing a capacity obtained using the measured current with the measured open-circuit voltage, and a battery cell used for the same.

Abstract: Provided is a non-destructive method for detecting lithium plating by which lithium plating can be detected in real time in an actual use environment of a secondary battery, a secondary battery charging method and apparatus for charging a secondary battery under the condition in which lithium plating does not occur by using this method, and a secondary battery system for detecting the state of a secondary battery by using this method. The method for detecting lithium plating according to the present disclosure is a method which detects lithium plating in a negative electrode in real time by observing a change in battery voltage as a function of SOC during charging a secondary battery, and determines a point at which a rise speed of the battery voltage slows down as a lithium plating occurrence point.

Abstract: Provided are a method of predicting a battery charge limit not to cause lithium (Li)-plating, and a battery charging method and apparatus capable of quickly charging a battery based on the battery charge limit. A battery charge limit prediction method according to the present disclosure includes (a) fabricating a three-electrode cell including a unit cell and a reference electrode, (b) measuring a negative electrode potential (CCV) based on a state of charge (SOC) while charging the three-electrode cell, and (c) determining a point at which the negative electrode potential is not dropped but starts to be constant, as a lithium (Li)-plating occurrence point, and setting the Li-plating occurrence point as a charge limit.

Abstract: Provided is a non-destructive method for detecting lithium plating by which lithium plating can be detected in real time in an actual use environment of a secondary battery, a secondary battery charging method and apparatus for charging a secondary battery under the condition in which lithium plating does not occur by using this method, and a secondary battery system for detecting the state of a secondary battery by using this method. The method for detecting lithium plating according to the present disclosure is a method which detects lithium plating in a negative electrode in real time by observing a change in battery voltage as a function of SOC during charging a secondary battery, and determines a point at which a rise speed of the battery voltage slows down as a lithium plating occurrence point.