Abstract: A battery monitoring method and a battery monitoring device are provided in the embodiments of the present disclosure. The battery monitoring method includes: obtaining a first difference value between a state of charge (SOC) of each of a plurality of cells and an average SOC of the plurality of cells according to first time information; obtaining a second difference value between the SOC of each of the plurality of cells and the average SOC of the plurality of cells according to second time information; determining self-discharge rates of the plurality of cells according to the first difference value and the second difference value; and sending a prompt message when the self-discharge rates meet a preset condition. According to the battery monitoring method provided in the embodiments of the present disclosure, the self-discharge rate of the battery can be monitored, and the safety of usage of the battery is improved.

Abstract: Embodiments of the application provide a method for charging battery a charging and discharging device, which can ensure the safety performance of the battery. The charging and discharging device includes a first DC/DC converter, a unidirectional AC/DC converter and a control unit, where the first DC/DC converter is a unidirectional DC/DC converter, and the control unit is configured to: receive a first charging current and control the unidirectional AC/DC converter and the first DC/DC converter to charge a battery through an AC power source based on the first charging current; receive a first discharging current, and control the battery to release power based on the first discharging current; and receive a second charging current, and control the unidirectional AC/DC converter and the first DC/DC converter to charge the battery through the AC power source based on the second charging current.

Abstract: Embodiments of the present invention relate to the field of circuit technology, and disclose a method for correcting a SOC of a battery pack, a battery management system, and a vehicle. The method for correcting an SOC of a battery includes: determining, when a charging process of the battery pack starts, whether an initial SOC value of the battery pack is less than or equal to a preset electricity quantity threshold; when the initial SOC value of the battery pack is less than or equal to the preset electricity quantity threshold, recording state information of the battery pack during the charging process, and generating a differential capacity curve of the battery pack according to the state information; correcting a current SOC value of the battery pack according to the differential capacity curve and a voltage-SOC reference curve of a non-decay zone of the battery pack.

Abstract: Provided is a method and an apparatus for determining a state of charge of a battery, a battery management system and a storage medium, and relates to the field of battery technologies, where the method includes: obtaining a current OCV value of a battery and cumulative continuous charging or discharging capacity information of the battery; obtaining SOC credible information based on the current OCV value and the cumulative continuous charging or discharging capacity information; obtaining a corrected SOC value corresponding to the current OCV value according to the SOC credible information. According to the present disclosure, accuracy of SOC correction could be improved by determining the SOC credible information under the current OCV; for batteries, especially those with a hysteresis characteristic, accuracy of SOC estimation could be improved, an error of SOC estimation could be reduced and reliability of battery and experience of users could be improved.

Abstract: A method for charging a traction battery includes obtaining a battery parameter of the traction battery that includes a state of charge and/or an open-circuit voltage, and, during a charging process of the traction battery, controlling the traction battery to discharge or stop being charged in response to the battery parameter changing by a parameter gap value. The parameter gap value is a first preset parameter gap value in a scenario in which the battery parameter of the traction battery is in a first parameter interval, and is a second preset parameter gap value in a scenario in which the battery parameter of the traction battery is in a second parameter interval. The first preset parameter gap value is greater than the second preset parameter gap value, and the battery parameter in the first parameter interval is less than the battery parameter in the second parameter interval.

Abstract: Provided are a method for charging a traction battery and a battery management system, which can improve the performance of a traction battery. The method for charging the traction battery is applied to a battery management system BMS of the traction battery, where the method includes: in a charging process of the traction battery, obtaining a state parameter of the traction battery, where the state parameter includes at least one of the following parameters: a state of charge SOC, a state of health SOH, and a temperature; determining an SOC interval value and a discharging parameter corresponding to discharging of the traction battery based on the state parameter of the traction battery, where the discharging parameter includes at least one of the following parameters: a discharging time, a discharging current, and a discharging waveform.

Abstract: Provided are a method for charging a traction battery and a battery management system. The method for charging the traction battery is applied to a battery management system, where the method includes: obtaining an SOH of the traction battery; in a charging process of the traction battery, obtaining an SOC of the traction battery; determining an SOC interval value corresponding to discharging or stopping being charged of the traction battery based on the SOH of the traction battery; and when the SOC of the traction battery changes by the SOC interval value, controlling the traction battery to discharge or stop being charged. Through the technical solution, in the charging process of the traction battery, the discharging or the stopping being charged of the traction battery can be controlled to reduce the risk of lithium precipitation in the traction battery and improve the safety performance of the traction battery.

Abstract: A charging method for a battery pack includes sending, by a battery management module of the battery pack, a charging request for a first current to a charging pile for charging, controlling, by the battery management module in response to determining that first-current charging of the battery pack meets a first predetermined condition, the battery pack to perform pulse discharge, and controlling, by the battery management module in response to determining that the pulse discharge of the battery pack meets a second predetermined condition, the battery pack to stop discharging, and sending a charging request for a second current to the charging pile for charging. The second current is less than the first current.

Abstract: A method for charging a power battery includes determining a first charging current for the power battery, determining, according to a temperature of the power battery, whether to perform thermal management of the power battery, determining, in response to determining to perform the thermal management of the power battery, a thermal management current according to the first charging current and charging pile power, and sending the first charging current and the thermal management current to a charging pile. The first charging current is used for charging the power battery and the thermal management current is used for performing the thermal management of the power battery.

Abstract: Embodiments of the present application provide a method for charging a power battery and a battery management system. The method may be applied to a battery management system for the power battery, and the method may comprise acquiring a charging mode of the power battery; determining a negative electrode potential safety threshold for the power battery according to the charging mode of the power battery; acquiring a negative electrode potential of the power battery during a charging process for the power battery; and adjusting a charging current for the power battery based on the negative electrode potential of the power battery and the negative electrode potential safety threshold.

Abstract: A method for estimating a power limit of a battery pack is disclosed, including: obtaining an actual minimum cell voltage of an electrical core with a minimum voltage in the battery pack; obtaining a static discharge power limit of the battery pack; calculating, based on the actual minimum cell voltage, an estimated discharge voltage of the electrical core with the minimum voltage for use when the battery pack is discharged based on the static discharge power limit; determining whether the estimated discharge voltage falls between a discharge voltage control threshold of the electrical core with the minimum voltage and an undervoltage threshold of the electrical core with the minimum voltage; and determining a target discharge power limit of the battery pack through a discharge interpolation algorithm when the estimated discharge voltage falls between the discharge voltage control threshold and the undervoltage threshold.

Abstract: A method for charging a traction battery includes obtaining an actual charging current of a traction battery during a charging process of the traction battery, and determining, based on a degree of the actual charging current exceeding a requested charging current, whether to control the traction battery to be discharged.

Abstract: A method for charging a traction battery includes obtaining a battery parameter of the traction battery that includes a state of charge and/or an open-circuit voltage, and, during a charging process of the traction battery, controlling the traction battery to discharge or stop being charged in response to the battery parameter changing by a parameter gap value. The parameter gap value is a first preset parameter gap value in a scenario in which the battery parameter of the traction battery is in a first parameter interval, and is a second preset parameter gap value in a scenario in which the battery parameter of the traction battery is in a second parameter interval. The first preset parameter gap value is greater than the second preset parameter gap value, and the battery parameter in the first parameter interval is less than the battery parameter in the second parameter interval.

Abstract: A method for charging a traction battery applied to a battery management system (BMS) for the traction battery, includes obtaining a temperature and a battery parameter of the traction battery, determining a parameter threshold based on the temperature of the traction battery, and during a charging process of the traction battery, controlling the traction battery to discharge or stop being charged in response to the battery parameter of the traction battery being greater than or equal to the parameter threshold and the battery parameter of the traction battery changing by a parameter gap value. The battery parameter includes at least one of a state of charge (SOC) or an open-circuit voltage (OCV).

Abstract: An embodiment of this application provides a charging control method and device and a power management controller. The charging control method includes: determining whether battery status of a battery pack meets preset conditions, where the battery pack includes a plurality of battery cells, and the preset conditions are: the battery pack has been left standing for a preset duration, and an open-circuit voltage of each battery cell in the battery pack falls within a preset range; and charging the battery pack based on a charging policy corresponding to a determining result, so that a capacity of a battery cell with a highest remaining capacity in the battery pack reaches a nominal capacity of the battery cell with the highest remaining capacity.

Abstract: Embodiments of the present application provide a method for charging a traction battery and a battery management system, where the method includes: obtaining a negative electrode potential of a traction battery during a charging process of the traction battery; and controlling the traction battery to be discharged when a difference between the negative electrode potential and a preset potential is less than or equal to a safety threshold. The method and the battery management system in the embodiments of the present application can improve the safety performance of the traction battery.

Abstract: This application provides a battery charging control method and device. Voltages of N cell units in an Mth sampling period are obtained, and a voltage of the battery at each sampling moment among K sampling moments in said sampling period is calculated. Charging of the battery is stopped when the voltage of the battery increases monotonically in the Mth sampling period and a trend of a fitting curve of the voltage of at least one cell unit among the N cell units in said sampling period is not rising.

Abstract: A method and device for determining an available capacity of a battery, a battery management system, and a storage medium, relating to the field of battery technologies. The method includes: obtaining the at least one DOD interval corresponding to the SOC interval of the operation of the battery, and the number of cycles and the cycle temperature corresponding to the at least one DOD interval; obtaining a recoverable amount of capacity fade of the battery according to the at least one DOD interval, the number of cycles and the cycle temperature, and determining an actual available capacity of the battery.

Abstract: This disclosure provides a method and an apparatus for determining available energy of a battery, a battery management system, and a storage medium, and relates to the field of battery technologies. The method includes: obtaining a DOD interval corresponding to a current SOC interval of the battery, and a cycle quantity and a cycle temperature that correspond to the DOD interval; obtaining recoverable energy information of the battery based on the DOD interval, the cycle quantity, and the cycle temperature; and determining current remaining available energy of the battery based on the recoverable energy information. For a battery with a recoverable attenuation capacity, the method, the apparatus, the battery management system, and the storage medium in this disclosure could help improve accuracy in estimating remaining available energy of the battery, thereby improving battery reliability, prolonging a service life of the battery, and enhancing user experience.

Abstract: This disclosure provides a method and an apparatus for correcting a state of health of a battery, a battery management system, and a storage medium, and relates to the field of battery technologies. The method includes: determining whether a current voltage value of a battery cell is within a correction OCV section of the battery cell; if yes, using the current voltage value of the battery cell as a correction voltage value; and acquiring an SOC correction value, and correcting a state of health (SOH) of the battery cell. According to the method, the apparatus, the battery management system, and the storage medium in this disclosure, reliability of an SOH correction result is improved, thereby providing accurate estimation of the state of health of the battery, a prolonged service life of the battery, and better user experience.