###### Contents  
* 1 Introduction
* 2 With the advancement in electrical and electronic engineering, our modern lifestyles are highly influenced and dependent on devices such as smartphones, tablet computers, E-bikes, Electric Vehicles (EV), power tools, and even home energy storage systems. According to the IEC 61140 standard [1], these devices can be categorized into two voltage levels [1], devices with a voltage less than 60 V AC and 120 V DC and devices with voltage-range up to 1000 V AC and 1500 V DC [1]. The primary category consists of devices such as power tools, E-bikes, laptops, and cell phones. These devices are usually considered to be safe due to their extra-low voltage, i.e., at this voltage level, the items are not considered to be fatal to an adult under normal conditions [1]. The latter category is also known as so-called low-voltage range devices, such as EVs with nominal voltage levels from 400 V DC to 800 V DC. This application acquires the required operating electrical energy from a Lithium-Ion (Li-Ion) cell, with a maximum cell voltage of 4.2 V [2]. In general, this voltage level is sufficient for a smartphone, but to run an E-bike (36 V DC) [3] and EV (400 V DC), almost 10 and 96 cells are connected in series, respectively. Such an increased number of cells also creates greater complexity in the system, as each cell should be operated in its safe operating conditions, i.e., each cell should operate within the manufacturer-definedcurrent, voltage, and temperature limits. Li-Ion cells react particularly critically to overcharging, as this leads to gas formation inside the cell [4]. Therefore, to make sure that each cell is operating within its correct range, a Battery Management System (BMS) is used in the battery. BMS monitors these parameters and ranges to ensure cells are operating in appropriate conditions. For example, without BMS, the Li-Ion cells are highly susceptible to overcharging and can lead to gas formation within the cell, which consequently causes a thermal runaway. However, the benefits of using BMS is that it disconnects the cell and/or battery in the event of such faults and prevents such critical situations [5]. In addition to BMS, cylindrical cells are also equipped with passive safety system such as a Current Interrupt Device (CID). A CID is installed in cells to ensure the safety of the battery module [6]. The purpose of a CID is to disconnect the cell internally in the event of gas formation caused by decomposition reactions and the pressure within the cell is increased. Such events occur due to excessively high temperatures or overcharging. However, due to the opening of CID, the potential risk of an electrical arc rises [7], which leads to the question of whether a cell with a CID used in a series connection is hazardous or not. For example, an EV with a 400 V system could have some technical issue that may lead to a very high voltage in a single cell, i.e., a voltage higher than twice of the nominal voltage as suggested by the FreedomCAR [8] standard; in such a scenario, the testing performed at the time of the approval of the EV battery is pointless because having a CID in such scenario could lead towards a dangerous situation [8; 9]. To find an optimal answer to this question, numerous tests were carried out in this research at different voltage levels that are often used in EV and Hybrid Electric Vehicles (HEV) applications, i.e., voltages ranging from 120 V DC to 800 V DC.