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1. A long-term high-power battery system with intelligent management, comprising a battery and a battery management system, a high-power current circuit for charging and discharging and a low-power load current circuit, said battery comprising at least one battery cell therein, said battery management system comprising a secondary control system, a low-power switching element, a high-capacity relay and a battery cell voltage balancing system, said battery management system and said low-power switching element being connected to said low-power load current circuit, said high-capacity relay being capable of carrying a large current and being set on said high-power current circuit to divide the high-current and low-current circuits, wherein when said secondary control system detects the high current load generated by the vehicle startup, said low-power switching element first interrupts the high load connected to said battery management system, and immediately activates said high-capacity relay set on said high-power current circuit through said secondary control system, so that the large current is allowed to pass through said high-capacity relay to provide the high current required by the vehicle load equipment such as the engine starter motor when starting the engine, so as to protect said low-power switching element.
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