Battery safety test device and method

A battery safety test method performed by a battery safety test device, the battery safety test device including:

• an electronic switching element;
• a mechanical switch element having a first end connected to either a battery positive electrode or a battery negative electrode and a second end connected to the electronic switching element,
• wherein the electronic switching element has a first end connected to the mechanical switch element and a second end connected to the other of the battery positive electrode or the battery negative electrode;
• a voltage sensor;
• a current sensor;
• and
• a variable resistor connected directed to either the battery positive electrode or the battery negative electrode and connected directly between the battery and the electronic switching element, the method comprising:
• applying power to the mechanical switch element to turn on the mechanical switch element;
• turning on the electronic switch element after the mechanical switch element is turned on;
• measuring a voltage of the battery, by the voltage sensor, and measuring a current across the battery, by the current sensor, after the mechanical switch element and the electronic switch element are turned on;
• calculating a voltage and current waveform of the battery using the measured voltage and current at both the battery positive electrode and the battery negative electrode;
• and
• determining a safety of the battery using the calculated voltage and current waveforms of the battery.