The invention discloses a lithium ion battery pack structure. The lithium ion battery pack structure comprises a battery pack body, a second air outlet pipe and a round air pipe, wherein a partition board is arranged in the middle in the battery pack body, a flexible package tank is arranged outside the battery pack body, and a first heat dissipation aluminum plate is arranged on the top end of the flexible package tank. The lithium ion battery pack structure specifically has an automatic protection function to lithium ions after the power is off, a certain air leakage protection function and a certain warning effect and is simple and convenient, and meanwhile, the specific fault type can be conveniently known, so that the situation that the performance of other lithium ion batteries is influenced due the continuous heat dissipation of a faulted lithium ion battery can be prevented, and furthermore, the security coefficient of the battery pack can be increased; and meanwhile, the lithium ion battery pack structure has a temperature warning effect, so that the overheated battery pack can be conveniently cooled, can be continuously cooled by virtue of heat dissipation aluminum plates, can be further cooled by virtue of a flexible water pipe and can be rapidly cooled by virtue of a draught fan.