US 12,334,540 B2
Battery pack and electrical device
Miaomiao Dong, Ningde (CN); Changfeng Bie, Ningde (CN); Shaocong Ouyang, Ningde (CN); Huan Ni, Ningde (CN); Hongyu Liu, Ningde (CN); Xin Sun, Ningde (CN); and Chenghua Fu, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Apr. 28, 2024, as Appl. No. 18/648,388.
Application 18/648,388 is a continuation of application No. PCT/CN2022/108604, filed on Jul. 28, 2022.
Prior Publication US 2024/0290944 A1, Aug. 29, 2024
Int. Cl. H01M 4/58 (2010.01); H01M 4/136 (2010.01); H01M 4/62 (2006.01); H01M 50/204 (2021.01); H01M 50/244 (2021.01); H01M 4/02 (2006.01)
CPC H01M 4/136 (2013.01) [H01M 4/5825 (2013.01); H01M 4/62 (2013.01); H01M 50/204 (2021.01); H01M 50/244 (2021.01); H01M 2004/028 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A battery pack, comprising a battery pack case and battery cells accommodated in the battery pack case, wherein:
based on a determined temperature distribution in an entire internal space of the battery pack case when being applied at a low temperature, the internal space of the battery pack case comprises a first region, a second region, and a third region in a descending order of temperature, the first region is located at a center part of the internal space of the battery pack box, the second region is a substantially annular area surrounding the first region, and the third region is a substantially annular area surrounding the second region,
a first battery cell is arranged in the first region, a second battery cell is arranged in the second region, a third battery cell is arranged in the third region, the first battery cell and the second battery cell are arranged adjacent to each other, and the second battery cell and the third battery cell are arranged adjacent to each other,
the internal space of the battery pack case comprises one or more first regions, second regions, and/or third regions;
a positive electrode of each of the first battery cell, the second battery cell, and the third battery cell comprises a positive electrode active substance, the positive electrode active substance being composed of lithium iron phosphate and a low-temperature additive, the low-temperature additive being selected from one or more of compounds containing at least two carbonyl groups that are respectively or jointly conjugated with a double bond, an unsaturated monocyclic ring or unsaturated fused ring, an unsaturated group, and an atom having lone-pair electrons connected thereto, and
at a test temperature lower than or equal to 10° C., a discharging capacity of a single cell of the first battery cell is CAP1, a discharging capacity of a single cell of the second battery cell is CAP2, a discharging capacity of a single cell of the third battery cell is CAP3, and the discharging capacities of the respective single cells of the first battery cell, second battery cell, and third battery cell satisfy the following relationships: a value of CAP3/CAP2 ranges from 1.005 to 1.15, and a value of CAP2/CAP1 ranges from 1.003 to 1.12.