Electric bicycles enter the U.S. market, there are relatively strict market access barriers, and the e-commerce platform Amazon has made clear requirements for electric vehicle products. All lithium car products must pass the relevant UL certification before they are allowed to be put on the shelves. In order to meet the market demand, UL launched a new voluntary safety certification program in early 2020, namely the US and Canada dual national standard ANSI/CAN/UL 2849 for electric bicycle systems.
UL 2849 Standard for Electric Vehicles it involves product safety, battery management system (BMS), software evaluation and functional safety evaluation requirements, as well as safety standards for controllers, motors, chargers and other components. The standard has been designated by the American National Standards Institute (ANSI) and the Standards Council of Canada (SCC) as the national standard of the United States and Canada, respectively, and is also a supplement to the previous UL 2272 standard for personal electric travel tools.
Recently, UL on electric bicycles UL 2849 the standard has undergone major revisions and supplementary explanations, mainly focusing on the following parts:
1. The provisions apply to stress relief tests for power lines, as well as circuits where hazardous energy sources are present. The original standard only for dangerous voltage circuit.
2. For Impact Test (impact test) and Mold Stress Test plastic shell stress relief test, the judgment after the test is explained in more detail, and the accessibility assessment of hazardous energy sources, hazardous moving parts and cells is added.
3. For internal plastic fire protection requirements, more exemption options have been added.
4. For the removable battery pack, it is necessary to evaluate the life plug test of the charging terminal.
5. The functional safety assessment of the motor controller is clearly defined.
· The motor controller should prevent the occurrence of dangerous situations related to the auxiliary functions of the motor, such as: accidental self-starting, self-starting of the motor without starting activation, etc.
· Motor controllers shall be subject to functional safety analysis according to chapter 12.4-12.6, and functional safety shall be evaluated according to 12.7 chapters.
6. Through the above supplement and improvement, the standard is more clear and clear, so as to avoid the occurrence of inconsistent understanding in the industry.
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