Arc discharge detection method and detection device for battery system, and battery energy storage system

An arc discharge detection method for a battery system, configured for detecting whether an arc discharge fault occurs in the battery system, wherein the arc discharge detection method for a battery system comprises:

• performing at least one of a first operation or a second operation,
• wherein the first operation is sampling a terminal voltage of the battery system twice and calculating a voltage difference value between two sampled terminal voltages as a first voltage difference value, and
• the second operation is sampling a terminal voltage v1 of the battery system and a terminal voltage v2 of an electricity load connected to the battery system at the same time and calculating a voltage difference value between v1 and v2 as a second voltage difference value;
• performing at least one of a third operation, a fourth operation, a fifth operation, or a sixth operation,
• wherein the third operation is sampling a terminal voltage of the battery system, and performing time domain analysis on a sampled terminal voltage data of the battery system to obtain a voltage time-domain feature value of the battery system,
• the fourth operation is sampling a terminal voltage of the battery system, and performing frequency domain analysis on a sampled terminal voltage data of the battery system to obtain a voltage frequency-domain feature value of the battery system,
• the fifth operation is sampling a charging and discharging current of the battery system, and performing time domain analysis on a sampled charging and discharging current data of the battery system to obtain a current time-domain feature value of the battery system, and
• the sixth operation is sampling a charging and discharging current of the battery system, and performing frequency domain analysis on a sampled charging and discharging current data of the battery system to obtain a current frequency-domain feature value of the battery system;
• and
• determining, on the basis of at least one of the current time-domain feature value, the current frequency-domain feature value, the voltage time-domain feature value and the voltage frequency-domain feature value, or at least one of the first voltage difference value or the second voltage difference value, whether an arc discharge fault occurs in the battery system,
• wherein criteria for judging whether at least one of the current time-domain feature value, the current frequency-domain feature value, the voltage time-domain feature value and the voltage frequency-domain feature value, or at least one of the first voltage difference value or the second voltage difference value meet arc discharge feathers comprise:
• criterion 1:
• the current time-domain feature value exceeds a preset current time-domain feature value threshold;
• criterion 2:
• the current frequency-domain feature value exceeds a preset current frequency-domain feature value threshold;
• criterion 3:
• the voltage time-domain feature value exceeds a preset voltage time-domain feature value threshold;
• criterion 4:
• the voltage frequency-domain feature value exceeds a preset voltage frequency-domain feature value threshold;
• criterion 5:
• the first voltage difference value exceeds a preset voltage difference threshold of the battery system;
• and criterion 6:
• the second voltage difference value exceeds a preset threshold for voltage difference between systems,
• when at least one of the criterion 5 or the criterion 6 and at least one of the criterion 1, the criterion 2, the criterion 3, or the criterion 4 are satisfied, it is determined that an arc discharge fault occurs in the battery system, and
• wherein at least one of the current time-domain feature value threshold, the current frequency-domain feature value threshold, the voltage time-domain feature value threshold or the voltage frequency-domain feature value threshold is obtained by the following:
• carrying out an arc discharge test of the battery system under arc discharge conditions of the battery system and collecting arc discharge data of the charging and discharging current of the battery system, carrying out an arc discharge-free test of the battery system under arc discharge-free conditions of the battery system and collecting arc discharge-free data of the charging and discharging current of the battery system, and performing time domain analysis on the arc discharge data and the arc discharge-free data of the charging and discharging current of the battery system to obtain arc discharge data and arc discharge-free data of the time-domain feature value of the charging and discharging current of the battery system, and obtaining an intermediate critical value of the two and determining it as the current time-domain feature value threshold;
• carrying out an arc discharge test of the battery system under arc discharge conditions of the battery system and collecting arc discharge data of the charging and discharging current of the battery system, carrying out an arc discharge-free test of the battery system under arc discharge-free conditions of the battery system and collecting arc discharge-free data of the charging and discharging current of the battery system, and performing frequency domain analysis on the arc discharge data and the arc discharge-free data of the charging and discharging current of the battery system to obtain arc discharge data and arc discharge-free data of the frequency-domain feature value of the charging and discharging current of the battery system, and obtaining an intermediate critical value of the two and determining it as the current frequency-domain feature value threshold;
• carrying out an arc discharge test of the battery system under arc discharge conditions of the battery system and collecting arc discharge data of the terminal voltage of the battery system, carrying out an arc discharge-free test of the battery system under arc discharge-free conditions of the battery system and collecting arc discharge-free data of the terminal voltage of the battery system, and performing time domain analysis on the arc discharge data and the arc discharge-free data of the terminal voltage of the battery system to obtain arc discharge data and arc discharge-free data of the time-domain feature value of the terminal voltage of the battery system, and obtaining an intermediate critical value of the two and determining it as the voltage time-domain feature value threshold;
• and
• carrying out an arc discharge test of the battery system under arc discharge conditions of the battery system and collecting arc discharge data of the terminal voltage of the battery system, carrying out an arc discharge-free test of the battery system under arc discharge-free conditions of the battery system and collecting arc discharge-free data of the terminal voltage of the battery system, and performing frequency domain analysis on the arc discharge data and the arc discharge-free data of the terminal voltage of the battery system to obtain arc discharge data and arc discharge-free data of the frequency-domain feature value of the terminal voltage of the battery system, and obtaining an intermediate critical value of the two and determining it as the voltage frequency-domain feature value threshold.