Wide-temperature type lithium iron phosphate battery and manufacturing process thereof

• Main Authors: ZHANG ZHIPENG, ZHAO YANHONG, LI ZHENDUO, LIN SHUANG, SHAN YINGHUI, XU YAN, ZHAN XIANGLIAN, WU TAO, ZHANG CHUANLE, LIU YANG, SONG GUOTAO, DONG ZHIXIN
• Format: Patent
• Language: Chinese; English
• Published: 31.03.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a wide-temperature type lithium iron phosphate battery and a manufacturing process thereof, and belongs to the technical field of lithium batteries. According to the technical scheme, the preparation method comprises the following steps: S1, homogenizing a positive active material, a binder and a conductive agent, and then coating, rolling and punching to obtain a positive pole piece; s2, homogenizing a negative active material, a binder, a conductive agent and oxalic acid, and then coating, rolling and punching to obtain a negative pole piece; s3, adding a low-temperature solvent and an additive into the electrolyte for modification to obtain a modified electrolyte; and S4, performing lamination according to the lamination sequence of the negative electrode, the diaphragm, the positive electrode, the diaphragm and the negative electrode, loading the laminated battery cell into an aluminum plastic film, and performing drying, liquid injection, sealing, formation, secondary sealing and