Byd Company Limited

Linwang Deng

Tianyu Feng

Sijia Liu

Chun Lv

Siqi Lin

Zihua Yang

Xiaoqian Li

Hongbin Luo

Xiaohua Tang

Yu Zeng

Shaowen Yin

Yunhao Liao

Shiwei Shu

Yonggang Yin

Yaming Deng

Guanhao Du

Zifeng Zhang

Yinghui Wang

Donghong Chen

A method for detecting a lithium plating state of a battery includes regularly collecting a voltage of a battery after the end of charging at a preset time interval after the battery is in an idle state, and associatively storing the collected voltage and a collection time as voltage data; constructing a time-differential voltage curve in a voltage-time coordinate system according to the voltage data; detecting whether a characteristic peak voltage exists in the time-differential voltage curve; and sending a warning message when detecting that the characteristic peak voltage exists in the time-differential voltage curve.

Battery lithium precipitation state detection method and system, vehicle, device, and storage medium

A method for calculating a cell state includes: acquiring a first knee-point voltage threshold of a cell, a first knee-point electricity corresponding to the first knee-point voltage threshold, a second knee-point voltage threshold of the cell and a second knee-point electricity corresponding to the second knee-point voltage threshold; recording a first charging curve of the cell in real time; obtaining a target knee point according to the first charging curve, the first knee-point voltage threshold, and the second knee-point voltage threshold, and obtaining a target-knee-point electricity according to the first knee-point electricity or the second knee-point electricity; detecting the electricity of the cell until the charging is completed, and obtaining a charged electricity of the cell from the target knee point to the completion of charging; and obtaining the capacity of the cell according to the target-knee-point electricity and the charged electricity.

Method and apparatus for calculating cell state, and storage medium

A path determination method includes: obtaining current position information and destination position information of a target vehicle; determining a candidate path of the target vehicle according to the current position information and the destination position information; acquiring road condition information of the candidate path and reference vehicle information; determining first energy consumption information required to be consumed by the target vehicle to travel on the candidate path over a unit distance according to the road condition information and the reference vehicle information; and recommending the candidate path to the target vehicle according to the first energy consumption information.

Path determination method and apparatus, device, and medium

A battery internal temperature information processing method, a computer device, and a storage medium that first acquire off-line testing data for off-line testing a battery module and construct an equivalent thermal network model from the off-line testing data, determine optimal model parameters of the equivalent thermal network model based on a multi-objective function fitting method; thereafter, a first battery internal temperature estimate of the battery of the vehicle at a first moment in actual operation of the vehicle is determined, in turn, based on the acquired initial state vector values of the battery of the vehicle, first operational data at a first moment in actual operation of the vehicle, and an equivalent thermal network model including the optimal model parameters.

Battery internal temperature information processing method, computer device, and storage medium

A warning method for battery thermal runaway includes: acquiring current temperature data of each temperature sensor arranged in a battery pack, current voltage data of each voltage sensor arranged in the battery pack, and current sensor disconnection data of each temperature sensor; calculating a number of occurrences of a primary feature at a current moment according to the current temperature data; calculating a number of occurrences of a secondary feature at the current moment according to the current voltage data and the current sensor disconnection data in a case that the number of occurrences of the primary feature is greater than 0; calculating a sum of the number of occurrences of the primary feature and the number of occurrences of the secondary feature at the current moment; and sending a warning for battery thermal runaway when the sum is greater than a preset feature number threshold.

Warning method and apparatus for battery thermal runaway, medium, and device

Provided is an electric vehicle driving mileage calculation method, comprising the following steps: calculate the energy consumption of a power battery of the electric vehicle per unit driving mileage; obtain the open-circuit voltage (OCv)-battery capacity (Q) reference curve of the power battery; obtain the OCv of the power battery; obtain the currently remaining available energy of the power battery according to the OCv and the OCv-Q reference curve of the power battery; calculate the driving mileage of the electric vehicle according to the energy consumption of the power battery per unit driving mileage and the currently remaining available energy of the power battery, whereby the driving mileage of the electric vehicle which is calculated is more accurate. Also disclosed is an electric-vehicle driving mileage calculation device and an electric vehicle.

Electric vehicle and method and apparatus for calculating endurance mileage of electric vehicle

Disclosed are an automobile, and a power battery pack equalization method and device, the method comprises the following steps: acquiring a high voltage inflection point of the charging curve of a battery cell of the power battery pack and acquiring the capacity of the battery cell according to the high voltage inflection point of the battery cell, and equalizing the battery cell according to the capacity of the battery cell. Hence, equalization management of the power battery pack can be realized, thereby improving the use ratio of the power battery pack and prolonging the service life of the power battery pack.

Vehicle, and equalization method and device for power battery pack

Provided is a method for calculating the SOH of a battery power pack. The method comprises the following steps: acquiring a charging curve of a cell of a battery power pack, and determining a current charging phase according to the charging curve, wherein the charging phase comprises a high voltage charging inflection point and a high voltage charging phase (S); acquiring a battery pack power amount corresponding to the high voltage charging inflection point and a battery pack power amount corresponding to the high voltage charging phase (S); calculating the remaining capacity of a cell according to the battery pack power amount corresponding to the high voltage charging inflection point and the battery pack power amount corresponding to the high voltage charging phase (S); and calculating the SOH of the cell according to the remaining capacity (S).

Method and apparatus for calculating SOH of battery power pack, and electric vehicle

A parallel device comprises a battery module, a plurality of switching units and a control module being couplable to the battery module. The battery module includes a plurality of battery groups. The plurality of switching units includes a plurality of first switches. Each of the switching units is couplable to a respective battery group in series. Each series combination of the switching unit and the respective battery group is coupled in parallel with another series combination, and each of the switching unit includes a respective first switch coupled with a load in series. The control module is configured to receive values of measured voltages across at least two battery groups, calculate a voltage difference between the two received voltage values, compare an absolute value of the voltage difference to a reference voltage to obtain a voltage comparison result, and turn ON or OFF at least one of the first switches in accordance with the comparison result.

Parallel device including a battery module and control method thereof

The present invention provides a battery-based grid energy storage for balancing the load of an power grid, wherein the energy storage comprises: a battery array; a bi-directional inverter unit; the bi-directional inverter system is configured to charge battery array using power from the power grid, or conversely, to transmit power from battery array to the power grid; a monitor system configured to detect the load, frequency and phase of the power grid, and control the bi-directional inverter system to charge battery array using power form the power grid, or conversely, transmits power from battery array to the power grid in accordance with the frequency and phase of the power grid so as to balance the load of the power grid, and meet the requirements during peak hours of electric power consumption.

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Shenzhen, China

Linwang Deng