Current control method, current control system, vehicle, and storage medium

A current control system, comprising a battery management system, wherein the battery management system is communicatively connected to a battery parallel system, the battery parallel system comprises a plurality of branches connected in parallel, each of the plurality of branches comprises one or more battery packs, the battery management system comprises a memory and a processor, the memory stores computer readable instructions, which, when executed by the processor, cause the processor to perform operations comprising:

• obtaining a reference branch current limit value of each of the plurality of branches;
• determining a first total current limit value based on a maximum allowable Direct Current Internal Resistance (DCIR) difference ratio among the plurality of branches, the number of the plurality of branches, and the reference branch current limit value of each of the plurality of branches, wherein the first total current limit value is determined such that a branch overcurrent warning will not occur when an actual maximum DCIR difference ratio among the plurality of branches is less than or equal to the maximum allowable DCIR difference ratio;
• and
• when the branch overcurrent warning occurs in the battery parallel system, setting a total current limit value of the battery parallel system from a default total current limit value to the first total current limit value;
• wherein the branch overcurrent warning occurs when it is detected that an actual current value of at least one of the plurality of branches exceeds the reference branch current limit value.