EV(Electric Vehicle) Batteries High low Temperature Test

Classification

It's mainly divided into two types.

1. Storage battery, for pure electric vehicles

2. Fuel cell, it's dedicated to fuel cell electric vehicles

Test Standard: IEC 62660-2

■Thermal Test

This test is performed to characterize cell responses to high-temperature environment.

a) Adjust the SOC of the cell to 100% for BEV application, and to 80% for HEV application.

b) The cell, stabilized at room temperature, shall be placed in a gravity or circulating air-convection oven. The oven temperature shall be raised at a rate of 5K/min to a temperature of 130℃±2K. The cell shall remain at this temperature for 30 min before the test is discontinued.

Note-If necessary, to prevent deformation, the cell may be maintained during the test in a manner that does not violate the test purpose. The manner to prevent deformation should be representative of cells inside battery systems and battery packs.

■Temperature cycling

This test is performed to characterize thermal durability of a cell by exposing at a low and high temperature environment alternately to cause expansion and contraction of cell components.

a) Adjust the SOC of the cell to 100% for BEV application, and to 80% for HEV application.

b) Perform the temperature cycling in accordance with ISO 16750-4 as shown in Table 4 the minimum operating temperature shall be -40℃ or Tmin specified by the cell manufacturer and the maximum operating temperature shall be 85℃ or Tmax specified by the cell manufacturer. Perform 30 test cycles as specified.

Table 4

 Test Standard: UL1642-2015 Clause 17

A battery is to be heated in a gravity convection or circulating air oven with an initial temperature of 20±5℃(68±9℉). The temperature of the oven is to be raised at a rate of 5±2℃(9±3.6℉) per minute to a temperature of 130±2℃ (266±3.6℉)and remain for 10 min. The sample shall return to room temperature (20±5℃) and then be examined. For batteries specified for temperatures above 100℃(212℉), the conditioning temperature shall be increased from 130±2℃(266±3.6℉), to 30±2℃(86±3.6℉) above the manufacturers maximum specified temperature. For a battery of lithium metal chemistry, the conditioning temperature shall be increased to a maximum of 170±2℃(338±3.6℉). 

Test Standard: UL 1642-2015 Clause 18

■Temperature cycling test

a) Raising the chamber-temperature to 70±3℃(158±5℉) within 30 min and maintaining this temperature for 4h.

b) Reducing the chamber temperature to 20±3℃(68±5℉) within 30 min and maintaining this temperature for 2h.

c) Reducing the chamber temperature to -40±3℃(-40±5℉) within 30 min and maintaining this temperature for 4h.

d) Raising the chamber temperature to 20±3℃(68±5℉) within 30 min.

e) Repeating the sequence for a further 9 cycles.

f) After the 10th cycle, storing the batteries for a minimum of 24h, at a temperature of 20±5℃(68±9℉) prior to examination.

LIB comprehensive environmental test chambers can perform this thermal and temeprature test, Please find temperature test chamber model TH-500 and thermal shock chamber TS-162.