The upper and lower test temperatures represent the highest and lowest temperatures on the surface of the battery cell when the battery can use the upper limit charging voltage and maximum charging current. The upper and lower limit test temperatures are determined based on the material characteristics of lithium batteries. The IEC 62133 Ed2 discussion draft and JIS C 8714 propose upper and lower limit test temperatures of 45 ℃ and 10 ℃, respectively, which are based on the common material characteristics of lithium-ion batteries on the market and cannot represent all lithium batteries. JIS C 8714 proposes that if new upper and lower limit test temperatures are needed, certain tests need to be conducted and additional information needs to be provided. The experimental investigation includes: the structural stability of the positive electrode material, the structural stability of the electrolyte, and other material characteristics. It is necessary to ensure the safety of the charged battery at the new upper limit test temperature, and add 5 ℃ to the new upper limit test temperature to meet the charging conditions of JIS C 8714 clause 5.1, and comply with the test requirements of clauses 5.2-5.5; Based on the lithium ion absorption of the negative electrode material and the lithium ion mobility of the electrolyte (corresponding to temperature), it is necessary to ensure the safety of the charged battery at the new lower limit test temperature, and add -5 ℃ to the new lower limit test temperature to apply the charging conditions of 5.1, and meet the test requirements of 5.2 to 5.5. Similar requirements are also included in the discussion draft of IEC 62133 Ed2

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