The fixed capacity of traditional tricycle batteries cannot adapt to the variable usage scenarios of users. Many users only need small-capacity batteries for short-distance commuting in daily life, but need large-capacity batteries for long-distance transportation, farm work and outdoor operations in peak seasons. Purchasing large-capacity batteries for a long time will increase the initial purchase cost and vehicle load, while small-capacity batteries cannot meet the demand of long-distance heavy-load use. Tricycle battery with expandable capacity adopts flexible capacity expansion technology, which supports users to freely upgrade and expand battery capacity according to actual use demand, realizing one battery foundation and multi-capacity adaptation, perfectly solving the contradiction between daily light use and peak high-demand use.

Flexible capacity expansion mode meets differentiated usage needs. The expandable capacity tricycle battery takes the standard battery pack as the basic unit, and reserves professional expansion interfaces and installation positions on the basis of the original battery pack. Users can keep the original battery pack unchanged and add expansion battery modules according to the increase of usage demand. The capacity can be expanded freely from basic capacity to medium capacity and high capacity, realizing stepless capacity upgrade. In daily urban and rural short-distance commuting, the basic capacity can meet the demand, with light vehicle body and low power consumption; in peak seasons such as farm harvest and cargo transportation, adding expansion modules can greatly improve battery capacity and cruising range, meeting the needs of long-distance and high-intensity use, with extremely high use flexibility.

Stable expansion compatibility without affecting battery performance. The expandable battery adopts unified standard expansion protocol and consistent cell parameters. The original battery pack and expansion modules have perfect compatibility in voltage, current, internal resistance and protection parameters. After capacity expansion, the battery pack can realize synchronous charge and discharge, consistent cell operation state, no voltage difference and parameter mismatch. The intelligent BMS system can automatically identify the expansion module, adaptively adjust the battery management parameters, uniformly monitor and protect the whole battery pack, ensure stable power output, consistent endurance performance and safe operation state after expansion. There is no power attenuation, no abnormal heating and no safety hazards after capacity expansion, which is consistent with the performance of the integrated large-capacity battery.

Cost-effective and long-term reusable, reducing user investment pressure. The expandable capacity design avoids the repeated purchase of batteries by users. Users only need to purchase the basic battery pack at the initial stage of use, and do not need to spend a lot of money to purchase high-capacity batteries that are not usually used. When capacity expansion is needed, only a small number of expansion modules need to be added, which greatly reduces the initial investment cost. The expansion module can be disassembled and reused. After the peak use season, the redundant expansion modules can be disassembled and stored, reducing the vehicle load and daily power consumption. Meanwhile, the modular expansion structure has good scalability, which can adapt to the long-term use and demand upgrade of users, extend the service life of the main battery pack, and effectively save the long-term use cost of users.