Since battery manufacturers are looking for the required lithium battery to be as close as possible to the vehicle requirements in terms of starting performance and reserve capacity, it is quite possible to increase the size of the lithium battery in the short term.
In the late 1990s, there was no significant cost trade-off between the increase in starting performance and the increase in reserve capacity. As a result, the lithium battery assembly may be divided into two parts. A lithium battery pack is completely used for starting purposes, with little or no reserve power, and its structure may be composed of many very thin plates with a large surface area and low electrical resistance. Another part of the lithium battery gives the storage capacity for small current draw and has a corresponding structure, so that the engine start is always independent of the parasitic current and other loads that will deplete the lithium battery.
If the useful energy for storing or releasing the lithium battery is expressed as 100%, the active material accounts for only 40% of the weight of the lithium battery, and electrochemically, less than 50% of the active material can be utilized. In theory, the specific energy can be doubled.